UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE
SECURITIES EXCHANGE ACT OF 1934

For the month of March 2022

Commission File No. 001-33580

GALIANO GOLD INC.
(Translation of registrant's name into English)

Suite 1640, 1066 West Hastings Street
Vancouver, British Columbia, V6E 3X1, Canada
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F

Form 20-F  [   ]  Form 40-F [X]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1)  [   ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7)  [   ]


SUBMITTED HEREWITH

Exhibit 99.1 included with this report is hereby incorporated by reference into the registrant's registration statement on Form F-10 (File no. 333-239109) (the "Registration Statement"), and to be a part thereof from the date on which this report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

Exhibits Description
   
99.1 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana, dated February 28, 2022
   
99.2 News release dated March 29, 2022, "Galiano Gold Provides Updated Mineral Resource Estimate and an Update on Mining Operations"


SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

GALIANO GOLD INC.

/s/ Fausto Di Trapani
________________________________
Fausto Di Trapani
Executive Vice President and Chief Financial Officer

Date:  March 29, 2022





 

 

NI 43-101 Technical Report

for the Asanko Gold Mine, Ashanti Region,

Ghana

 

Effective Date:

February 28, 2022

 

Prepared by:

Galiano Gold Inc

1640-1066 West Hastings Street

Vancouver, BC V6E 3X1

 

 

 

 

 


Qualified Persons

Company

Richard Miller, P.Eng.

Galiano Gold Inc.

Greg Collins, MAusIMM(CP)

Galiano Gold Inc. (Former)

Eric Chen, P.Geo.

Galiano Gold Inc. (Former)

Alan Eslake, FAusIMM

Asanko Gold Ghana Ltd.

Mario E. Rossi, FAusIMM

GeoSystems International Inc.

Malcolm Titley, MAIG

CSA Global Ltd.

Benoni Owusu Ansah, P.E.

Knight Piésold Ltd.



Richard Miller, P.Eng.

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Richard Miller, P.Eng.,

Suite 1640 - 1066 West Hastings St., Vancouver, British Columbia, Canada

Vice President, Technical Services, Galiano Gold Inc.

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
BASc Mining and Mineral Process Engineering, University of British Columbia, Canada, 1987
P.Eng., Engineers and Geoscientists British Columbia (EGBC)

I have practiced my profession continuously since 1987 and have worked at copper, diamond and gold mines in Canada, South Africa, Namibia, Guinea and Turkey in the progressive capacities of Mining Engineer, Project Manager, Mine Manager and General Manager. I have also held corporate positions as Manager Mining, Director Mine Engineering (Open Pit) and VP Technical Services, in which I have had overseeing involvement in mine engineering and technical services matters at various operating mines and development projects.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
October 14 2021 to October 21 2021.

e. Responsibilities
I am responsible for Sections 1.1, 1.2, 1.7, 1.9 to 1.12, 2, 3, 4, 5, 15, 16, 18, 19, 20.1 to 20.8, 21, 22, 24, 25.1, 25.2, 25.6, 25.9, 25.10, 26.4, and 27 of this Technical Report.

f. Independence
I am not independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
I started employment with Galiano Gold Inc in October 2021 in the capacity of Manager, Mining and in December 2021 was appointed to Vice President, Technical Services for Galiano Gold Inc.  In both of these capacities I have had oversight of planning and execution of technical programs supporting the Asanko Gold property, reviewed short and long term mining plans, had communications with and attended meetings with discipline leads at site and at the corporate level.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed and sealed by Richard Miller"     
     
    March 29, 2022
Richard Miller, P.Eng.   Date


Gregory Collins, MAusIMM(CP)

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Gregory Collins, P.Geo.,

#1640-1066 W. Hastings Street, Vancouver, British Columbia

(former) Vice President, Exploration, Galiano Gold Inc.

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications

B.AppSc Geology (Hons), Queensland University of Technology, Brisbane, Australia, 1992

MAusIMM CP (Geo) and SEG Fellow.

I have practiced my profession continuously since 1993 and have worked on exploration projects for gold, copper, zinc-lead-silver, and uranium in Australia, Mongolia, China, Russia, and Indonesia in the progressive capacities of Geologist, Chief Geologist, and Exploration Manager.  I have also held the corporate position of VP Exploration, in which I have had overseeing involvement in exploration/mine geology matters at various exploration projects and operating mines.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection

February 10, 2021 to May 5, 2021, with regular visits thereafter every quarter for approximately 3 weeks each visit. Most recent visit from October 12 to November 4, 2021.

e. Responsibilities

I am responsible for Sections 1.3, 1.4, 6, 7, 8, 9, 10, 11, 12, 23, 25.3, 25.4, and 26.3 of this Technical Report.

f. Independence
I am not independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
As Vice President of Exploration, I had oversight of planning and execution of exploration programs on the Asanko Gold property; developed, reviewed and presented exploration programs and budgets; regularly met and communicated with exploration teams onsite to ensure smooth program execution. I coordinated and collaborated with other departments on related programs involving exploration efforts, such as metallurgical and geotechnical drilling, and resource infill drilling.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed by Gregory Collins"    
     
    March 29, 2022
Gregory Collins, MAusIMM(CP)   Date



 Eric Chen, P.Geo.
CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Eric Chen, P.Geo.,

#1640-1066 W. Hastings Street, Vancouver, British Columbia

(former) Vice President, Technical Services, Galiano Gold Inc.

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
BSc. Geology, Peking University, China, 1991
P.Geo., Engineers and Geoscientists British Columbia (EGBC)

I have practiced my profession continuously since 1991 and have 30 years of experience working at gold, copper, base metal projects and mines, both open pit and underground, in Canada, Mexico, United States, Turkey, China and Ghana, in the capacity of exploration and resource geologist, with progressive responsibilities as Superintendent, Manager, VP Mineral Resources, and VP Technical Services.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
Regular site visits since March 2021 (average 1 visit per quarter, 10-15 days per visit). Dates for most recent visit to site: 16th to 30th September 2021.

e. Responsibilities
I am responsible for Sections 1.6, 12.1, 14.0, 14.4, 14.5, 14.6, 14.7, 14.8, 25.5, and 26.2 of this Technical Report.

f. Independence
I am not independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
As VP Mineral Resource (Aug 2020 to Aug 2021) and VP Technical Services (Aug to Dec 2021) of Galiano Gold Inc., I had oversight of planning and execution of technical programs supporting resource and reserve development, grade control and reconciliation, and other relevant mining studies on the Asanko Gold property.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

“Signed and sealed by Eric Chen”

   
     
    March 29, 2022
Eric Chen, P.Geo.   Date


Alan Eslake, B.App.Sc.

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Alan Eslake, B.App.Sc..

100 Winbourne Road, Hazelbrook 2779, NSW Australia

Chief Metallurgist, Asanko Gold Ghana Limited

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
B.App.Sc. (Materials), University of Technology, Sydney, 1992

Fellow, Australasian Institute of Mining and Metallurgy (FAusIMM)

I have practiced my profession continuously since 1992 and have worked in numerous commercial metallurgical laboratories and operating mine sites. Experienced with gold and base metals in global locations including New Zealand, PNG, China, Chile and Turkey.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
Site based since December 2020.

e. Responsibilities
I am responsible for Sections 1.5, 1.8, 13, 17, 25.7, 25.8, and 26.1 of this Technical Report.

f. Independence
I am not independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
I have been employed by Galiano Gold Inc. / Asanko Gold Ghana Limited in the capacity of Chief Metallurgist since December 2020. Areas of focus have included production enhancement projects and supervision of both internal and external testwork programs.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed by Alan Eslake"

   
     
    March 29, 2022
Alan Eslake, B.App.Sc   Date


Mario E. Rossi, FAusIMM

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Mario E. Rossi,

2385 NW Executive Center Dr., Suite 100, Boca Raton, FL, 33431, USA

Principal Geostatistician, GeoSystems International, Inc.

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
Mining Engineer, Universidad Nacional de San Juan, Argentina, 1985
Master of Science, Geostatistics, Stanford University, 1988
Fellow, Australian Instutute of Mining and Metallurgy (AusIMM)
Registered Member, Society for Mining, Metallurgy &Exploration (SME)

I have practiced my profession continuously since 1985. I have worked in over 100 different mining projects at various stages of development and operations around the world, including precious and base metals, multi-element deposits (Au, Ag, Cu, Fe, Pb, Zn, etc.), laterite-type deposits, sedimentary deposits (uranium, coal), Iron hematite and magnetite deposits, and industrial minerals such as limestone, nitrate, iodine, lithium and graphite deposits. I have over 30 years experience in resource modeling for epithermal-type gold deposits, including Birimian-style Au deposits. These include Ashanti Gold (Ghana); Yaoure Au deposits (Ivory Coast); Salobo (Senegal); Chaarat Au deposit (Kyrgyzstan); and several others that are similar in style to the Esaase and Abore deposits.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
I have visited the site from March 18 through April 1, 2021

e. Responsibilities
I am responsible for Sections 14.1, 14.2, and 25.5 of this Technical Report.

f. Independence
I am independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
I have had no prior involvement with Asanko Gold Mines or Galiano Gold Inc.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed by Mario Rossi"

   
     
    March 29, 2022
Mario Rossi, FAusIMM   Date


Malcolm Titley - BSc, MAusIMM, MAIG

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation

Malcolm Titley, MAIG

Suite 2, First Floor, Springfield House, Horsham, West Sussex, United Kingdom, RH12 2RG

Principal Consultant, CSA Global

b. Title and Effective Date of Technical Report

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.

Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
BSc Geology and Chemistry, University of Cape Town, 1979
Member, Australian Institute of Geoscientists
Member, Australian Institute of Mining and Metallurgy

I have practiced my profession continuously since 1981 and have over 20 years operating experience at gold, iron ore and copper mines in Australia, Papua New Guinea and Ghana, in the progressive capacities of Geologist, Chief Geologist, Pit Superintendent and Mine Manager. I have practiced as a consultant to the mining industry for over 20 years, primarily focused on mineral resource estimation and reporting, due diligence and feasibility studies and operations support and business improvement. My consulting experience includes time as a Managing Director.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
Regular site visits during the period November 2017 to January 2020 (on average 1 visit per quarter, minimum of 7 days per visit). Dates for most recent visit to site: 16th to 22nd January 2020.

e. Responsibilities
I am responsible for Sections 14.3 and 25.5 of this Technical Report.

f. Independence
I am independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
I was QP for the December 2017 Nkran, Akwasiso and Dynamite Hill deposits Mineral Resource Estimate. I was also an independent consultant to Asanko Gold Ghana providing business improvement support services through my independent company Maja Mining Limited during the period 1st March 2018 until December 2020.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed by Malcolm Titley"

   
     
    March 29, 2022
Malcolm Titley, MAIG   Date


Benoni Owusu Ansah, P.E.

CERTIFICATE OF QUALIFIED PERSON

This Certificate of Qualified Person has been prepared to meet the requirements of National Instrument 43-101 Standards of Disclosure for Minerals Projects Part 8.

a. Name, Address, Occupation
Benoni M. Owusu Ansah, P.E., MGhIE, MASCE, MGGS, MGhIGS
No. 20 Second Close, Airport Residential Area, Accra, Ghana
Civil/Projects Manager, Knight Piésold, West Africa

b. Title and Effective Date of Technical Report
NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana.
Effective Date: February 28, 2022 (the Technical Report).

c. Qualifications
I have over 15 years of professional experience as a Civil Engineer with specialization in geotechnical, environmental, and structural engineering. My experience spans from prefeasibility, feasibility, detailed design to construction, and 'forensic' engineering of Tailings and Water Storage Dams, Harbours, Airports, and structural foundations. I have engineering design, construction and management experiences with various large-scale projects in Ghana, Cameroun, Congo DRC, Cote d'Ivoire, Burkina Faso, Mauritania, Sierra Leone, Congo, Togo, Mali and Guinea. I am currently a Civil/Projects Manager with Knight Piésold and undertake engineering designs as well as construction quality control and quality assurance for several mines. I am the Engineer of Record for the design and construction of the Tailings Storage Facility for the Asanko Gold Mine.

As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument              43-101 for the sections of the technical report that I take responsibility.

d. Site Inspection
Regular site visits from 2019 through 2022 for various engineering design, constructions, and dam safety audits. Date of most recent visit to site was January 3rd, 2022. A full day was spent on site providing technical guidance for the Stage 6 Expansion of the TSF and discussing future TSF developments with site management.

e. Responsibilities
I am responsible for Section 20.9 of this Technical Report.

f. Independence
I am independent of Galiano Gold Inc. in accordance with the application of Section 1.5 of National Instrument 43-101.

g. Prior Involvement
I was part of the engineering team for mine start-up construction, including Stage 1 of the existing TSF and Process Plant development. I have supervised/managed the construction of Stage 2 expansion to the TSF. I have served as the Lead Design Engineer and Projects Manager for Stage 4 through Stage 6. I provide ongoing support for life of mine TSF development. I am the Engineer of Record for the design and construction of the Tailings Storage Facility for the Asanko Gold Mine.

h. Compliance with NI 43-101
I have read National Instrument 43-101 and Form 43-101F1 and the Technical Report has been prepared in compliance with same.

i. Disclosure
As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the parts of the Technical Report that I am responsible for, contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

"Signed by Benoni M. Owusu Ansah"

   
     
    March 29, 2022
Benoni M. Owusu Ansah, P.E.   Date


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table of Contents

1 Summary 1
   
1.1 Introduction 1
   
1.2 Property Description and Ownership 1
   
1.3 Geology and Mineralization 3
   
1.4 Exploration and Drilling 5
   
1.5 Metallurgical Testwork and Recoveries 6
   
1.5.1 Esaase 6
   
1.5.2 Nkran 7
   
1.5.3 Abore 7
   
1.5.4 Miradani North 7
   
1.5.5 Akwasiso 7
   
1.5.6 Dynamite Hill 7
   
1.5.7 Adubiaso 8
   
1.6 Mineral Resource Estimates 8
   
1.7 Mineral Reserves 9
   
1.8 Mineral Processing 9
   
1.9 Infrastructure 10
   
1.10 Environmental 11
   
1.11 Risks and Opportunities 11
   
1.12 Conclusions and Recommendations 12
   
2 Introduction 13
   
2.1 Terms of Reference 13
   
2.2 Qualified Persons 14
   
2.3 References and Information Sources 15
   
2.4 Units, Currency and Abbreviations 15
   
3 Reliance on Other Experts 22
   
3.1 Mineral Tenure, Surface Rights, Agreements, and Environmental Information 22
   
3.2 Political Information 22
   
4 Property Description and Location 23
   
4.1 Location and Area 23
   
4.2 Licences and Mineral Tenure 26
   
4.2.1 Mining Legislation Overview 26
   
4.2.2 Issuer's Title to the AGM Concessions 27
   
4.3 Agreements, Royalties and Encumbrances 28
   
4.4 Environmental Obligations 28

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


4.5 Permits 28
   
4.6 Fraser Institute Survey 29
   
5 Accesibility, Climate, Local Resources, Infrastructure and Physiography 30
   
5.1 Topography, Elevation and Vegetation 30
   
5.2 Access 31
   
5.3 Proximity to Population Centre and Transport 31
   
5.4 Climate and Length of Operating Season 31
   
5.5 Infrastructure 31
   
5.6 Surface Rights 32
   
6 History 34
   
6.1 Prior Ownership and Ownership Changes 34
   
6.2 Historical Exploration and Development 35
   
6.3 Previous Mineral Resource Estimates 38
   
6.4 Historical Production 38
   
7 Geological Setting and Mineralization 39
   
7.1 Regional Geology 39
   
7.2 Local Geology 43
   
7.3 Regolith and Weathering Profile 44
   
7.4 Property Geology and Mineralization 46
   
7.4.1 Nkran 46
   
7.4.2 Esaase 48
   
7.4.3 Akwasiso 65
   
7.4.4 Abore 67
   
7.4.5 Asuadai 70
   
7.4.6 Adubiaso 72
   
7.4.7 Miradani North 74
   
7.4.8 Dynamite Hill 75
   
8 Deposit Types 77
   
9 Exploration 78
   
9.1 Introduction 78
   
9.2 Grids and Surveys 78
   
9.3 Geological Mapping 78
   
9.4 Geochemical Sampling 80
   
9.4.1 Soil Geochemical Sampling 80
   
9.4.2 Trenching 83
   
9.5 Geophysical Surveys 84

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


9.6 Exploration Potential 87
   
9.6.1 Nkran Deeps 87
   
9.6.2 Miradani Deeps 88
   
9.6.3 Kaniago West 88
   
9.6.4 Midras South 88
   
9.6.5 Amoaman 89
   
9.6.6 Other Prospects 90
   
10 Drilling 91
   
10.1 Type and Extent of Drilling 91
   
10.2 Drill Logging Procedures 100
   
10.3 Collar Survey 101
   
10.4 Downhole Survey 101
   
10.5 Core Recovery 102
   
10.6 Core Handling 102
   
10.7 Core Photography 102
   
10.8 Core Cutting and Sampling 102
   
10.9 QC Insertions 103
   
10.10 Geotechnical Logging 104
   
10.11 Core Storage 104
   
10.12 Density Sampling 104
   
10.13 RC Sampling 105
   
10.14 Pre 2014 106
   
11 Sample Preparation, Analyses, and Security 107
   
11.1 Legacy Data (Pre-2014) 107
   
11.1.1 Resolute 107
   
11.1.2 PMI 107
   
11.2 Current Data (Post 2014) 109
   
11.2.1      Sample Preparation Methods and Quality Control Measures Taken Before Submission to the Laboratory 109
   
11.2.2 Laboratory Certification 111
   
11.2.3 Laboratory Sample Preparation and Analysis 111
   
11.2.4 Check Assay Analysis 112
   
11.2.5 Pre-2020 Quality Assurance and Quality Control Results 112
   
11.2.6 Post 2020 Quality Assurance and Quality Control Results 113
   
11.3 Qualified Person's Opinion on Adequacy of Sample Preparation, Security 148

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


12 Data Verification 149
   
12.1 Data Validation and Site Visits 149
   
12.2 Database Structure 150
   
12.3 Data Review 151
   
12.3.1 Exploration Database 151
   
12.3.2 Grade Control Database 151
   
12.4 Qualified Person's Opinion on Adequacy of Data For Purposes Used in Technical Report 151
   
13 Mineral Processing and Metallurgical Testing 152
   
13.1 Previous Project Testwork 152
   
13.1.1 Metallurgical Testwork 2008 to 2013 152
   
13.1.2 Metallurgical Testwork 2014 to 2016 152
   
13.1.3 Metallurgical Testwork 2018 to 2019 153
   
13.1.4 Addendum Testwork A20208 (2019) 157
   
13.2 Current Testwork 2021 - Esaase Main Pit 158
   
13.2.1 Sample Selection Criteria 158
   
13.2.2 Bulk Composites Testing (ALS A22281) 162
   
13.2.3 Variability Samples Testing (ALS A22281) 171
   
13.3 Current Testwork 2021 - Nkran and Obotan Satellite Deposits 177
   
13.3.1 Nkran 2021 Testwork (ALS A22441) 177
   
13.3.2 Abore 2021 Testwork (ALS A22441) 179
   
13.3.3 Miradani North 2021 Testwork (ALS A22441) 181
   
13.3.4 Akwasiso 185
   
13.3.5 Dynamite Hill Previous Recoveries 185
   
13.3.6 Adubiaso Previous Recoveries 186
   
13.4 Recent Plant Performance 187
   
13.5 Life of Mine Recovery Estimates 187
   
13.5.1 Esaase 187
   
13.5.2 Nkran and Obotan Satellite Pits 188
   
14 Mineral Resource Estimates 189
   
14.1 Esaase Mineral Resource Estimate 190
   
14.1.1 Database 190
   
14.1.1 Geological Models 190
   
14.1.2 Exploratory Data Analysis 191
   
14.1.3 Estimation/Interpolation Methods 200
   
14.1.4 Validation 201
   
14.1.5 Classification of Mineral Resources 204
   
14.1.6 Comparison with Production Results 206

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


14.1.7 Reasonable Prospects of Eventual Economic Extraction 206
   
14.1.8 Mineral Resource Estimate 207
   
14.1.9 Factors That May Affect the Mineral Resource Estimate 208
   
14.2 Abore Mineral Resource Estimate 209
   
14.2.1 Database 209
   
14.2.2 Geological Models 209
   
14.2.3 Exploration Data Analysis 210
   
14.2.4 Estimation/Interpolation Methods 215
   
14.2.5 Validation 215
   
14.2.6 Classification of Mineral Resources 220
   
14.2.7 Reasonable Prospects of Eventual Economic Extraction 221
   
14.2.8 Mineral Resource Statement 222
   
14.2.9 Factors That May Affect the Mineral Resource Estimate 223
   
14.3 Nkran Mineral Resource Estimate 224
   
14.3.1 Database 224
   
14.3.2 Geological Models 224
   
14.3.3 Exploration Data Analysis 226
   
14.3.4 Estimation/Interpolation Methods 231
   
14.3.5 Validation 234
   
14.3.6 Classification of Mineral Resources 238
   
14.3.7 Reasonable Prospect of Eventual Economic Extraction 240
   
14.3.8 Mineral Resource Statement 241
   
14.3.9 Factors That May Affect the Mineral Resource Estimate 242
   
14.4 Akwasiso Mineral Resource Estimate 243
   
14.4.1 Database 243
   
14.4.2 Geological Models 246
   
14.4.3 Exploration Data Analysis 250
   
14.4.4 Estimation/Interpolation Methods 256
   
14.4.5 Validation 259
   
14.4.6 Classification of Mineral Resources 261
   
14.4.7 Reasonable Prospect of Eventual Economic Extraction 262
   
14.4.8 Mineral Resource Statement 263
   
14.4.9 Factors That May Affect the Mineral Resource Estimate 264
   
14.5 Dynamite Hill Mineral Resource Estimate 265
   
14.5.1 Database 265
   
14.5.2 Geological Models 266

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Effective Date: February 28, 2022


14.5.3 Exploration Data Analysis 269
   
14.5.4 Estimation/Interpolation Methods 274
   
14.5.5 Validation 277
   
14.5.6 Classification of Mineral Resources 280
   
14.5.7 Reasonable Prospect of Eventual Economic Extraction 281
   
14.5.8 Mineral Resource Statement 281
   
14.5.9 Factors That May Affect the Mineral Resource Estimate 283
   
14.6 Miradani North Mineral Resource Estimate 283
   
14.6.1 Database 283
   
14.6.2 Geological Models 284
   
14.6.3 Exploration Data Analysis 288
   
14.6.4 Estimation/Interpolation Methods 294
   
14.6.5 Validation 297
   
14.6.6 Classification of Mineral Resources 301
   
14.6.7 Reasonable Prospect of Eventual Economic Extraction 303
   
14.6.8 Mineral Resource Statement 303
   
14.6.9 Factors That May Affect the Mineral Resource Estimate 304
   
14.7 Asuadai Mineral Resource Estimate 305
   
14.7.1 Database 305
   
14.7.2 Geological Models 305
   
14.7.3 Exploration Data Analysis 310
   
14.7.4 Estimation/Interpolation Methods 314
   
14.7.5 Validation 316
   
14.7.6 Classification of Mineral Resources 319
   
14.7.7 Reasonable Prospect of Eventual Economic Extraction 319
   
14.7.8 Mineral Resource Statement 320
   
14.7.9 Factors That May Affect the Mineral Resource Estimate 321
   
14.8 Adubiaso Mineral Resource Estimate 322
   
14.8.1 Database 322
   
14.8.2 Geological Models 322
   
14.8.3 Exploration Data Analysis 325
   
14.8.4 Estimation/Interpolation Methods 331
   
14.8.5 Validation 332
   
14.8.6 Classification of Mineral Resources 335
   
14.8.7 Reasonable Prospect of Eventual Economic Extraction 336
   
14.8.8 Mineral Resource Statement 336

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Effective Date: February 28, 2022


14.8.9 Factors That May Affect the Mineral Resource Estimate 337
   
15 Mineral Reserve Estimates 338
   
16 Mining Methods 339
   
17 Recovery Methods 340
   
17.1 Process Description 340
   
17.2 Crushing 342
   
17.2.1 Esaase Source 342
   
17.2.2 Obotan Source 342
   
17.3 Milling 342
   
17.4 Gravity Gold Recovery 343
   
17.5 Pre-leach Thickening 343
   
17.6 Carbon in Leach (CIL) 343
   
17.7 Tailings and Detoxification 343
   
17.8 Carbon Treatment 344
   
17.9 Electrowinning 344
   
17.10 Gold Room 345
   
17.11 Reagents 345
   
17.11.1 Flocculant 345
   
17.11.2 Copper sulphate 345
   
17.11.3 Sodium Metabisulphite (SMBS) 345
   
17.11.4 Diesel 346
   
17.11.5 Caustic Soda 346
   
17.11.6 Sodium Cyanide 346
   
17.11.7 Hydrated Lime 346
   
17.11.8 Ferric Chloride 346
   
17.11.9 Hydrochloric Acid 346
   
17.11.10 Quicklime 346
   
17.11.11 Anti-scaling Agent 346
   
17.11.12 Activated Carbon 347
   
17.11.13 Grinding Media 347
   
17.12 Plant Process Services 347
   
17.12.1 Filtered Raw Water 347
   
17.12.2 Fire Water 347
   
7.12.3 Potable Water 347
   
17.12.4 Process Water and Plant Run-off 348
   
17.12.5 Discharge Water Treatment 348

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Effective Date: February 28, 2022


17.12.6 High Pressure (Compressed) Air Reticulation 348
   
17.12.7 Low Pressure (Blower) Air Reticulation 348
   
17.12.8 Oxygen Reticulation 348
   
17.12.9 Return Water and Return Water Treatment 348
   
18 Project Infrastructure 349
   
18.1 Overview 349
   
18.2 Existing Infrastructure 349
   
18.2.1 Obotan - Existing Site Infrastructure 349
   
18.2.2 Esaase - Existing Site Infrastructure 349
   
18.2.3 Esaase-Obotan Haul Road 350
   
18.3 Site Layout 350
   
18.3.1 Obotan Layout 350
   
18.3.2 Esaase Layout 352
   
18.3.3 Haul Road Esaase to Obotan 353
   
18.4 Site Access 355
   
18.5 Waste Rock Dumps 355
   
18.6 Tailings Storage Facility 355
   
18.7 Storm Water Management 355
   
18.7.1 General 355
   
18.7.2 Sediment Control Structures 356
   
18.8 Potable Water Supply 356
   
18.9 Sewage Handling 356
   
18.10 Power 356
   
18.10.1 Power Supply - Obotan 356
   
18.10.2 Power Supply - Esaase 356
   
18.11 Fuel 356
   
19 Market Studies and Contracts 357
   
19.1 Introduction 357
   
19.2 Marketing Strategy 357
   
19.3 Marketing Contracts 357
   
19.3.1 Refining Contract 357
   
19.3.2 Off-take Agreement 357
   
19.4 Pricing 357
   
19.4.1 Payment Terms 357
   
19.5 Product Specification 358
   
19.6 Shipping, Storage and Distribution 358

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


20 Environmental Studies, Permitting & Social / Community Impact 359
   
20.1 Ghanaian Legislation and Guidelines 359
   
20.1.1 Environmental and Social 359
   
20.1.2 Minerals and Mining 360
   
20.1.3 Compensation 361
   
20.1.4 Health, Safety and Labour 361
   
20.2 Permitting Process 362
   
20.2.1 Obotan Permits 362
   
20.2.2 Esaase Permits 362
   
20.2.3 EPA Permitting Process for Esaase 362
   
20.3 Stakeholder Engagement 366
   
20.3.1 Guiding Principles of Stakeholder Engagement 366
   
20.3.2 Engagement with Communities 366
   
20.3.3 Governmental Stakeholders 367
   
20.4 Environmental and Social Management 368
   
20.4.1 Environmental Management System 368
   
20.5 Environmental and Social Mitigation 369
   
20.6 Environmental and Social Monitoring 369
   
20.6.1 Surface and Groundwater 370
   
20.6.2 Dust and Noise 370
   
20.6.3 Aquatic Environment 370
   
20.6.4 Ecological Environment 371
   
20.6.5 Acid Rock Drainage Monitoring 371
   
20.6.6 Tailing Storage Facility 371
   
20.7 Socio-Economic Aspects 371
   
20.8 Closure and Reclamation 371
   
20.9 Tailings Storage Facility Design and Construction 373
   
20.9.1 Monitoring 375
   
20.9.2 Water Management Strategy 375
   
20.9.3 Closure and Rehabilitation 376
   
20.9.4 Geotechnical Investigation 376
   
20.9.5 Tailings Physical Characteristics 377
   
20.9.6 Tailings Geochemical Characteristics 378
   
21 Capital and Operating Costs 379
   
22 Economic Analysis 380
   
23 Adjacent Properties 381

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


24 Other Relevant Informtion 383
   
25 Interpretation and Conclusions 384
   
25.1 Risks 384
   
25.2 Opportunities 384
   
25.3 Geological Setting and Mineralization and Deposit Type 385
   
25.4 Exploration, Drilling, Sample Preparation and Analysis, and Security 385
   
25.5 Mineral Resources 385
   
25.6 Mineral Reserves 385
   
25.7 Metallurgical Testing and Recoveries 386
   
25.8 Processing 386
   
25.9 Infrastructure 386
   
25.10 Market Studies and Contracts 386
   
26 Recommendations 387
   
26.1 Metallurgy 387
   
26.2 Geology and Mineral Resources 387
   
26.3 Exploration 388
   
26.3.1 Geological Mapping 388
   
26.3.2 Geophysics 389
   
26.3.3 Geochemistry 391
   
26.3.4 Spectral 391
   
26.3.5 Drilling 391
   
26.4 Operating Cost Optimization 394
   
27 References 395

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

List of Tables

Table 1-1 Asanko Gold Mine Mining Lease and Prospecting Concession Areas 3
   
Table 1-2 Head Grade Recovery Model Correlations 6
   
Table 1-3 Summary of the Mineral Resource at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 8
   
Table 1-4 Process Plant Operating Criteria 9
   
Table 2-1 Abbreviations and Unit of Measurement 16
   
Table 4-1 Asanko Gold Mine Mining Lease and Prospecting Concession Areas 27
   
Table 6-1 Summary History of Ownership 34
   
Table 6-2 Summary of Historical Exploration and Development per Deposit 35
   
Table 7-1 Summary of Structural Controls on Mineralization per Deposit 46
   
Table 7-2 Stratigraphic Unit with a General Description 49
   
Table 9-1 Summary of Surface Samples Taken by AGM Since 2017 80
   
Table 10-1 Drilling Summary by Deposit (to February 28, 2022) 91
   
Table 10-2 Grade Control Drilling Summary by Deposit (2014 to 2021) 100
   
Table 10-3 Grade Control Sample Summary by Deposit Since 2014 100
   
Table 10-4 Drill Hole Sample Summary by Deposit for the Period of 2014 to 2021 100
   
Table 11-1 Summary of Laboratory Location and Accreditation Status 108
   
Table 11-2 Laboratory Sample Preparation and Analysis Methods Before 2014 108
   
Table 11-3 Primary Laboratories Between 2014-2021 111
   
Table 11-4 Summary of Analytical Laboratories Sample Preparation and Gold Assay Techniques 111
   
Table 11-5 Summary Findings From Previous QC Reviews 112
   
Table 11-6 Nkran QAQC Samples For Period 01/06/2020 to 30/09/2020 113
   
Table 11-7 Standard Materials for Nkran Submitted to Lab - 2020 114
   
Table 11-8 Esaase QC Samples for the Period 1/01/2021 to 23/08/2021 116
   
Table 11-9 Esaase Exploration CRM Results 118
   
Table 11-10 Esaase GC Sample Statistics for the Period of 20/11/2019 to 30/10/2021 120
   
Table 11-11 Esaase Grade Control CRM Results (Method BR307) 124
   
Table 11-12 Miradani North QAQC Samples for Period 20/11/2019 to 10/30/2021 126
   
Table 11-13 Miradani North CRM Results Showing Mean Bias 128
   
Table 11-14 Dynamite Hill QAQC Samples For Period 16/7/2021 to 7/9/2021 130
   
Table 11-15 Dynamite Hill CRM Results Showing Mean Bias 132
   
Table 11-16 Akwasiso QAQC Samples For Period 20/11/2019 to 30/10/2021 133
   
Table 11-17 Akwasiso Exploration CRM Results 136
   
Table 11-18 Akwasiso GC Samples for Period 20/11/2019 to 30/10/2021 138
   
Table 11-19 Akwasiso GC CRM Results (Method BR307) 141

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Table 11-20 Abore QAQC Samples for Abore for the Period 1/1/2020 to 23/06/2021 142
   
Table 11-21 Abore Exploration CRM Results 144
   
Table 11-22 Adubiaso QAQC Samples for the Period 01/05/2020 to 30/06/2020 145
   
Table 11-23 Adubiaso Exploration CRM Results 146
   
Table 13-1 Identification of Samples for Esaase Metallurgical Testwork 154
   
Table 13-2 Head Grade Recovery Model Correlations 156
   
Table 13-3 Nkran Past Production Annualized Recovery 157
   
Table 13-4 Hole and Interval Data With Expected Composite Gold Head Grades (Esaase) 161
   
Table 13-5 Esaase Bulk Composites - Main Elements of Interest (ALS A22281) 163
   
Table 13-6 Esaase Bulk Composites - Comparison of Gold Head Assays (g/t Au) 164
   
Table 13-7 Esaase Bulk Composites - Multi-element Analysis (ALS A22281) - Part 1 164
   
Table 13-8 Esaase Bulk Composites - Multi-element Analysis (ALS A22281) - Part 2 165
   
Table 13-9 Esaase Bulk Composites - Summary of Gravity/CIL Recovery Results 166
   
Table 13-10 Esaase Bulk Composites - Diagnostic Gold Assays on Final Residues 168
   
Table 13-11 Esaase Bulk Composites - Recoveries at Increasing Cut-off Grades (g/t) 169
   
Table 13-12 Esaase Variability Samples Head Assays 172
   
Table 13-13 Esaase Variability Samples - Comparison of Gold Head Assays (g/t) 173
   
Table 13-14 Esaase Variability Samples Recovery Test Results 174
   
Table 13-15 Comparison of Esaase Bulk Composites Recoveries to Corresponding Constituents 175
   
Table 13-16 Esaase Recoveries Cropped According to Calculated Gold Head Assays 176
   
Table 13-17 Esaase Recovery by Domain 177
   
Table 13-18 Nkran Composites Details 178
   
Table 13-19 Nkran Composites Head Assays 178
   
Table 13-20 Nkran Summary of Recoveries (600 ppm Initial NaCN) 179
   
Table 13-21 Abore Composites Details 180
   
Table 13-22 Abore Composite Head Assays 181
   
Table 13-23 Abore Summary of Recoveries 181
   
Table 13-24 Miradani North Head Assays 183
   
Table 13-25 Miradani North Multi Element Analyses - Oxidation State Composites 183
   
Table 13-26 Miradani North Recovery Testing - Summarised Results 184
   
Table 13-27 Dynamite Hill Mill Feed Component and Plant Recoveries 185
   
Table 13-28 Adubiaso Past Production Summary 186
   
Table 13-29 Esaase Head Grade Recovery Model Correlations 188
   
Table 14-1 Summary of Mineral Resources at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 189
   
Table 14-2 Esaase Statistics of In Situ Bulk Density Values 193

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Table 14-3 Esaase High-grade Outlier Capping, 1 m Composites 195
   
Table 14-4 Esaase High-grade Au Outlier Control for MIK Domains 200
   
Table 14-5 Esaase MIK Estimation plans, Domains 1, 3, 4, and 5+6 201
   
Table 14-6 Esaase Kriging Plan, OK Estimation Plans, Domains 2 and 0 201
   
Table 14-7 Esaase Global Au Means by Domain 203
   
Table 14-8 Esaase Main Pit Mined-out Volume Comparisons, Resource and Grade Control Models 206
   
Table 14-9 Esaase Conceptual Constraining Pit Parameters 207
   
Table 14-10 Esaase Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 207
   
Table 14-11 Abore Statistics of Density Values, "MEAS", Abore 211
   
Table 14-12 Abore Definition of High-Grade Au Capping, 1 m Composites 213
   
Table 14-13 Abore Ordinary Kriging plan, 0.30 g/t Indicator and Au Grade Estimation Inside 0.30 g/t Grade Envelope 215
   
Table 14-14 Abore Basic Statistics, Estimated Grades vs 1 m Declustered Composites, Sub-celled and Final, Re-blocked Models 217
   
Table 14-15 Abore Relative Differences at Critical Cut-offs, SMU Theoretical Model vs Sub-celled Model 220
   
Table 14-16 Abore Conceptual Constraining Pit Parameters 221
   
Table 14-17 Abore Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 222
   
Table 14-18 Nkran Database - Summary of Exploration Drill Data Used in the MRE 224
   
Table 14-19 Comparison of Nkran Domain Volumes Based on the Interpreted Geology Wireframes 2018 vs 2020 226
   
Table 14-20 Nkran Data Field Flagging and Description 228
   
Table 14-21 Nkran Composite Statistics per ESTZON 229
   
Table 14-22 Nkran Top-cut Statistics per ESTZON 230
   
Table 14-23 Nkran Variogram Models for Au g/t 230
   
Table 14-24 Nkran Block Model Dimensions 231
   
Table 14-25 Nkran Change of Support Calculations 233
   
Table 14-26 Nkran Statistical Validation of Estimation Domains 235
   
Table 14-27 Nkran Conceptual Constraining Pit Parameters 240
   
Table 14-28 Nkran Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 241
   
Table 14-29 Akwasiso Exploration and Grade Control Drill Holes Used In 2021 Modelling And Grade Estimation 243
   
Table 14-30 List of Akwasiso Geological Models and Codes 249
   
Table 14-31 Akwasiso Summary Statistics of Mineralization Domain Raw and 25 g/t Au Top-Cut Assays of Exploration Drill Holes 252

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Effective Date: February 28, 2022


Table 14-32 Akwasiso Summary Statistics of Mineralization Domain Raw and 25 g/t Au Top-Cut Assays of Grade Control Drill Holes 252
   
Table 14-33 Akwasiso Composite Au Statistics of Exploration and GC Drillholes 254
   
Table 14-34 Akwasiso Domain 100, 210, 310 Composite Au Variogram (Correlogram) Parameters 255
   
Table 14-35 Akwasiso 2021 Resource Model Setup 256
   
Table 14-36 Akwasiso Grade Estimation Parameters 258
   
Table 14-37 Akwasiso Bulk Density Values Assigned to Resource Block Model (by Material Type) 259
   
Table 14-38 Comparison of Akwasiso Resource Model with Simulation Model (Between June 30 2021 Topography and $1600 Resource Pit Shell) 259
   
Table 14-39 Akwasiso 2021 Resource Classification Criteria 261
   
Table 14-40 Akwasiso 2021 Resource Drillhole Coverage Summary 261
   
Table 14-41 Akwasiso Conceptual Constraining Pit Parameters 263
   
Table 14-42 Akwasiso Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 263
   
Table 14-43 Dynamite Hill Exploration Drill Holes 265
   
Table 14-44 List of Dynamite Hill Geological Models and Codes 269
   
Table 14-45 Summary Statistics of Dynamite Hill Mineralization Domain Raw and Top-Cut Assays of Exploration Drill Holes 270
   
Table 14-46 Summary Statistics of Dynamite Hill Mineralization Domain Raw and Top-Cut Assays of Grade Control Drill Holes 271
   
Table 14-47 Composite Au Statistics of Dynamite Hill Exploration Drillholes 271
   
Table 14-48 De-clustered and Raw Dynamite Hill Exploration Drillhole Composite Au Statistics Comparison (Main Zone) 272
   
Table 14-49 Dynamite Hill Domain 10 Composite Au Normal Score Variogram (Correlogram) Parameters 274
   
Table 14-50 Dynamite Hill 2021 Resource Model Setup 274
   
Table 14-51 Dynamite Hill Domain 10 Simulation Model Setup 274
   
Table 14-52 Dynamite Hill Sequential Gaussian Simulation and Inverse Distance (ID3) Estimation Parameters 276
   
Table 14-53 Bulk Density Values Assigned to Dynamite Hill Block Model (by Material Type) 276
   
Table 14-54 Global Stats (at 0 g/t Cut-off grade) Comparison Between Indicated Blocks and Exploration Drill Hole Composites 278
   
Table 14-55 Dynamite Hill Resource Model Reconciliation Summary Within Mined-out Pit 280
   
Table 14-56 Dynamite Hill Resource Classification Criteria 280
   
Table 14-57 Dynamite Hill Conceptual Constraining Pit Parameters 281
   
Table 14-58 Dynamite Hill Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 282
   
Table 14-59 Miradani North Exploration Drillholes 283
   
Table 14-60 List of Miradani North Geological Models and Codes 288

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Effective Date: February 28, 2022


Table 14-61 Raw and Top-Cut Assays Statistics of Miradani Exploration Drillholes 290
   
Table 14-62 Composite Au Statistics of Miradani Exploration Drillholes 291
   
Table 14-63 De-clustered and Raw Miradani Exploration Drillhole Composite Au Statistics Comparison 292
   
Table 14-64 Miradani Domain 100 Composite Au Normal Score Variogram (Correlogram) Parameters 294
   
Table 14-65 Miradani North 2021 Resource Model Setup 294
   
Table 14-66 Miradani North Mineralization Domain 100 Simulation Model Setup 294
   
Table 14-67 Miradani Domain 100 SGS Search Parameters 296
   
Table 14-68 Miradani Inverse Distance (ID3) Estimation Parameters 296
   
Table 14-69 Miradani Bulk Density Values Assigned to Resource Block Model (by Material Type) 297
   
Table 14-70 Global Statistics Comparison of Miradani North Resource Model, Composites, and ID3 Estimate 300
   
Table 14-71 Miradani North 2021 Resource Classification Criteria 301
   
Table 14-72 Miradani North Conceptual Pit Parameters 303
   
Table 14-73 Miradani North Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 303
   
Table 14-74 Asuadai Mineralized Domains 310
   
Table 14-75 Asuadai Estimation Domains 311
   
Table 14-76 Asuadai Domain Statistics and Top Caps 313
   
Table 14-77 Asuadai Variogram Parameters 313
   
Table 14-78 Asuadai Block Model Dimensions 314
   
Table 14-79 Asuadai Dry Bulk Density Values Assigned to the Block Model 315
   
Table 14-80 Asuadai Classification Criteria 319
   
Table 14-81 Asuadai Conceptual Pit Parameters 320
   
Table 14-82 Asuadai Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 320
   
Table 14-83 Adubiaso Wireframe files 326
   
Table 14-84 Adubiaso Domain Pre and Post Top Cut Statistics 329
   
Table 14-85 Adubiaso Applied Variogram Parameters 330
   
Table 14-86 Adubiaso Block Model Dimensions 331
   
Table 14-87 Adubiaso Bulk Density Block Assignment 332
   
Table 14-88 Adubiaso Classification Criteria 335
   
Table 14-89 Adubiaso Conceptual Constraining Pit Parameters 336
   
Table 14-90 Adubiaso Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022 336
   
Table 17-1 Key Process Plant Operating Criteria 340
   
Table 17-2 AGM Process Plant Major Equipment 341
   
Table 18-1 Esaase to Obotan Haul Road Upgrade - Summary of Design Criteria 350

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Effective Date: February 28, 2022


Table 20-1 Tailings Storage Facility Design Summary 373
   
Table 23-1 Adjacent Property Listing 381

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

List of Figures

Figure 1-1 Location of the Asanko Gold Mine Tenements 2
   
Figure 1-2 Simplified Map of the West African Craton, with Associated Gold Deposits (Modified from Goldfarb et al, 2017) 4
   
Figure 1-3 Regional Geology of Southwest Ghana Around AGM Concessions 5
   
Figure 1-4 Process Plant Block Flow Diagram 10
   
Figure 4-1 Location of the Asanko Gold Mine in the Ashanti Region of Ghana, West Africa 24
   
Figure 4-2 Location of the AGM Tenements 25
   
Figure 5-1 Example of Topography and Vegetation Around Esaase Pit Location 30
   
Figure 7-1 Simplified Map of the West African Craton, with Associated Gold Deposits (Modified from Goldfarb et al, 2017) 39
   
Figure 7-2 Regional Geology of Southwest Ghana Around AGM Concessions 41
   
Figure 7-3 Generalized Stratigraphy of Southwest Ghana 42
   
Figure 7-4 Road-cut Exposure Showing Regolith Typical Regolith on a Hill on the Asankrangwa Belt 44
   
Figure 7-5 Location of AGM Deposits Along the Asankrangwa Gold Belt 45
   
Figure 7-6 Nkran Plan View Pit Showing Geology 47
   
Figure 7-7 Nkran Plan View and Cross-section Through Pit Showing Mineralized Domains Based on Grade, Vein Density and Orientation Data 48
   
Figure 7-8 Examples of Sedimentary Textures at Esaase 50
   
Figure 7-9 Interpreted North Wall of Cut 3 at Esaase 51
   
Figure 7-10 Complex Folding in the 'Hawk Unit' Adjacent to the Hawk Fault 52
   
Figure 7-11 Illustrates the Gold-poor/Dead Zone Associated with the 'Mobile Belt' 53
   
Figure 7-12 Examples of Steeply Plunging F1 Folds at Esaase 54
   
Figure 7-13 Examples of Deformation Fabrics at Esaase 56
   
Figure 7-14 Examples of F2 Folds and S2 Crenulation Cleavage at Esaase 57
   
Figure 7-15 Textures from the 'Mobile Belt' at Esaase 58
   
Figure 7-16 Vein Textures at Esaase Part 1 59
   
Figure 7-17 Vein Textures at Esaase Part 2 60
   
Figure 7-18 Grade Control Drilling Patterns Highlighting the Distribution Around Folds 61
   
Figure 7-19 NE Corridor, Illustrating the en Echelon Tension Gash Vein Arrays 62
   
Figure 7-20 Stereographic Plots for Veins and North Wall of Cut 3 Showing Vein Distribution in Various Units 63
   
Figure 7-21 Schematic Geological Model for Fold Mineralization at Esaase 64
   
Figure 7-22 Akwasiso Plan View Showing Geology 65
   
Figure 7-23 Akwasiso Cross-section Through the Pit Showing Geology 66
   
Figure 7-24 Plan View of Akwasiso Mineralization Envelopes at Akwasiso 67
   
Figure 7-25 Abore Plan View Showing Drill Hole Distribution and Pit Shells 69

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Effective Date: February 28, 2022


Figure 7-26 Abore Cross-sectional View Through the Pit Showing Geology 69
   
Figure 7-27 Abore Longitudinal-Section Through the Pit Showing Geology 70
   
Figure 7-28 Asuadai Plan View and Cross-section Through Pit Showing Geology 71
   
Figure 7-29 Adubiaso Plan View and Cross-section Through Pit Showing Geology 73
   
Figure 7-30 Miradani North Plan View Through Pit Showing Geology 74
   
Figure 7-31 Miradani North Plan View and Cross Section Through Pit Showing Geology 75
   
Figure 7-32 Dynamite Hill Plan View Through the Pit Showing Geology 76
   
Figure 7-33 Dynamite Hill Cross-section Through the Pit Showing Geology 76
   
Figure 9-1 Regional Geological Interpretation from VTEM Survey 79
   
Figure 9-2 Plan Showing Gold-in-Soil Anomalies 81
   
Figure 9-3 Surface Geochemistry Sampling Locations (2017 to 2021) 82
   
Figure 9-4 Trench Map from Trench JGTR21-001, Jeni River Prospect 84
   
Figure 9-5 Map of Time-Domain EM Over the AGM License Package 85
   
Figure 9-6 Gradient Array Survey Over the Esaase Deposit 86
   
Figure 9-7 Longitudinal Section Through the Nkran Deposit Showing Multiple Shoot Trends That Hold Potential for Additional Resources 87
   
Figure 9-8 Longitudinal Section Through the Miradani North Deposit 88
   
Figure 9-9 Interpreted Geology and Mineralized Trends on the Amoaman Property 89
   
Figure 9-10 Mineralized Trends on the AGM License Package Recommended to Follow-up 90
   
Figure 10-1 Distribution of Drilling and Trenching Across the AGM License Package, on Interpreted Geology 93
   
Figure 10-2 Plan Showing Distribution of Drill Hole Collars at Nkran Pit 95
   
Figure 10-3 Plan Showing Distribution of Drill Hole Collars at Esaase 95
   
Figure 10-4 Plan Showing Distribution of Drill Hole Collars at Akwasiso and Nkran Extension 96
   
Figure 10-5 Plan Showing Distribution of Drill Hole Collars at Abore 96
   
Figure 10-6 Plan Showing Distribution of Drill Hole Collars at Asuadai 97
   
Figure 10-7 Plan Showing Distribution of Drill Hole Collars at Dynamite Hill 97
   
Figure 10-8 Plan Showing Distribution of Drill Hole Collars at Adubiaso and Adubiaso Extension 98
   
Figure 10-9 Plan Showing Distribution of Drill Hole Collars at Miradani North 98
   
Figure 10-10 Sample Labelling Example 103
   
Figure 11-1 Plot of Nkran Blanks for the Period Noted 114
   
Figure 11-2 Scatter Plot of Nkran Exploration Field Duplicates 115
   
Figure 11-3 Half Absolute Relative Difference (HARD) Plot of Nkran Field Duplicates from Exploration 115
   
Figure 11-4 QQ Plot of Nkran Pulp Duplicates From Exploration 116
   
Figure 11-5 Plot of Blanks for Esaase Exploration/Infill Drilling for the Period Noted 117
   
Figure 11-6 Plots of the Performance of CRM's G308-3 and G319-2 for Esaase Exploration Drilling 117
   
Figure 11-7 Scatter Plot of Original vs Field Duplicates for Esaase Exploration/Infill Drilling 118
   
Figure 11-8 HARD Plot of Original vs Field Duplicates for Esaase Exploration/Infill Drilling 119

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Effective Date: February 28, 2022


Figure 11-9 QQ Plot of Original vs Pulp Duplicates for Esaase Exploration/Infill Drilling 120
   
Figure 11-10 Plot of Blanks for Esaase Grade Control Drilling for the Period Noted 121
   
Figure 11-11 Plot of Various CRM's That Have Exceeded 3SD (Esaase) 123
   
Figure 11-12 Scatter Plot of Original vs Field Duplicates for Esaase Grade Control Drilling 125
   
Figure 11-13 QQ Plot of Original vs Field Duplicates for Esaase GC RC Drilling 125
   
Figure 11-14 Plot of Blanks for Miradani North Exploration Drilling for the Period Noted 126
   
Figure 11-15 Plot of CRM Standard Performance for G308-3 for Miradani North Exploration 127
   
Figure 11-16 Plot of CRM Performance for G910-6 for Miradani North Exploration 127
   
Figure 11-17 Scatter Plot of Originals vs Field Duplicate Samples at Miradani North 128
   
Figure 11-18 HARD Plot for Miradani North 129
   
Figure 11-19 QQ Plot For Pulp Duplicates at Miradani North 129
   
Figure 11-20 Plot of Blanks Performance at Dynamite Hill for the Period Stated 130
   
Figure 11-21 Plot of CRM Performance for G308-3 for Dynamite Hill Exploration 131
   
Figure 11-22 Plot of CRM Performance for G910-6 for Dynamite Hill Exploration 131
   
Figure 11-23 Scatter Plot of Duplicate vs Original Performance at Dynamite Hill 132
   
Figure 11-24 HARD Plot Analysis of Duplicate vs Original Performance at Dynamite Hill 133
   
Figure 11-25 Plot of Blanks for Akwasiso Exploration Drilling for the Period Stated 134
   
Figure 11-26 Plot of CRM Performance for G901-3 135
   
Figure 11-27 Plot of CRM Performance for G910-6 135
   
Figure 11-28 Akwasiso Exploration Field Duplicate Scatter Plot 136
   
Figure 11-29 Akwasiso Exploration Field Duplicate HARD Analysis Plot 137
   
Figure 11-30 Akwasiso Exploration Pulp Duplicate QQ Plots 138
   
Figure 11-31 Plot of Blanks for Akwasiso Grade Control RC Drilling for the Period Noted 139
   
Figure 11-32 Plot of CRM G318-2 Performance for Akwasiso GC 140
   
Figure 11-33 Plot of CRM G315-2 Performance for Akwasiso GC 140
   
Figure 11-34 Akwasiso Grade Control RC Field Duplicate Scatter Plot Showing Poor Repeatability 141
   
Figure 11-35 Akwasiso Grade Control RC Field Duplicate HARD Analysis Plots 142
   
Figure 11-36 Plot of Blanks for Abore Exploration Drilling for the Period Noted 143
   
Figure 11-37 Plot of CRM G914-2 and G914-10 Performance for Abore Exploration 143
   
Figure 11-38 Scatter Plot of Field Duplicates from Abore Exploration Drilling for the Period Noted 144
   
Figure 11-39 HARD Analysis of Field Duplicates from Abore Exploration Drilling 145
   
Figure 11-40 Plot of Blanks for Adubiaso Infill Drilling for the Period Noted 146
   
Figure 11-41 Scatter Plot of Field Duplicates from Adubiaso Infill Drilling 147
   
Figure 11-42 HARD Analysis of Field Duplicates from Adubiaso Infill Drilling 147
   
Figure 13-1 Esaase Mineralized Domains and Location of Metallurgical Samples (Plan View) 159

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 13-2 Esaase Mineralized Domains and Location of Metallurgical Samples (Long Section) 160
   
Figure 13-3 Esaase Average CIL Residue Grade (g/t) by Size 167
   
Figure 13-4 Esaase Average CIL Stage Recovery (%) by Size 167
   
Figure 13-5 Head Grade vs Total Recovery - Esaase Bulk Composites 169
   
Figure 13-6 Head Grade vs Total Recovery, with High Grade Outlier Omitted - Esaase Bulk Composites 169
   
Figure 13-7 Gold Removed from Final Residue During Acetonitrile Strip vs. OC Content - Esaase Bulk Composites 170
   
Figure 13-8 Organic Carbon Grade vs. CIL Stage Recovery - Esaase Bulk Composites 170
   
Figure 13-9 Esaase Bulk Composite vs. Constituents' Recoveries 176
   
Figure 13-10 Esaase Gold Recovery by Mineralized Domain 177
   
Figure 13-11 Nkran Composite Long Section 178
   
Figure 13-12 Abore Composites Long Section 180
   
Figure 13-13 Miradani North Drill Holes Long Section 182
   
Figure 13-14 Plant Recovery versus Dynamite Hill Feed Component 186
   
Figure 14-1 Esaase Cross Section Through Main Pit Showing Stratigraphic Units and Drill Hole Databases 190
   
Figure 14-2 Esaase Mineralized Domains 191
   
Figure 14-3 Esaase Histogram and Basic Statistics of Gold (g/t) in Samples Within the Domain 1 (Main Pit, Hanging Wall) 192
   
Figure 14-4 Esaase Histogram and Basic Statistics of Gold (g/t) in Samples Within the Domain 3 (Main Pit, Footwall) 192
   
Figure 14-5 Esaase Histogram and Basic Statistics, Au (g/t), All 1 m Composites within Domain 1 (Main Pit, Hanging Wall) 193
   
Figure 14-6 Esaase Histogram and Basic Statistics, Au (g/t), All 1 m Composites within Domain 3 (Main Pit, Footwall) 194
   
Figure 14-7 Esaase Probability Plot, Au (g/t), All 1 m Composites Within Domain 1 (Main Pit, Hanging Wall) 194
   
Figure 14-8 Esaase Probability Plot, Au (g/t), All 1 m Composites Within Domain 3 (Main Pit, Footwall) 195
   
Figure 14-9 Esaase De-clustered Histogram and Basic Statistics, 50 m x 50 m x 10 m cell size, Au (g/t), Domain 1 196
   
Figure 14-10 Esaase Quantile-Quantile Plot, Au (g/t), Oxide vs Transition Zones, Composites Inside the Mineralized Envelopes 196
   
Figure 14-11 Esaase Au Grade Profile, Domain 1 Contact with Outside Composites 197
   
Figure 14-12 Esaase Histogram and Basic Statistics, RC Grade Control Data, All Domains 197
   
Figure 14-13 Esaase Probability Plot, RC Grade Control Data, Domain 1 198
   
Figure 14-14 Esaase Quantile-Quantile Plot, Exploration vs Grade Control Au 3 m Composites, No More Than 3 m Apart 198
   
Figure 14-15 Esaase Summary Variogram Model, 0.80 g/t Indicator, 1 m Composites, Domain 3 199

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-16 Esaase Main Pit Au Grade Estimates Within Resource Pit, Level 194.5 202
   
Figure 14-17 Esaase South Pit Au Grade Estimates Within Resource Pit, Level 194.5 202
   
Figure 14‑18 Esaase Main Pit Au Grade Estimates Within Resource Pit, Cross Section 724500N (Approx.), Looking NE 203
   
Figure 14‑19 Esaase South Pit Au Grade Estimates Within Resource Pit, Longitudinal Section, Looking NE to the Right of Image 203
   
Figure 14‑20 Esaase Drift Plot, Domain 3 Au Grade Estimates (in Blue) vs Declustered Composites (Nearest Neighbor Model, in Orange) 204
   
Figure 14-21: Esaase Resource Classification, Longitudinal Section 205
   
Figure 14-22 Esaase Resource Classification, Level 194.5m. 205
   
Figure 14-23 Esaase Measured and indicated Grade-Tonnage Curves 208
   
Figure 14-24 Abore Three-dimensional View of the 0.3 g/t Au Grade Envelope in Red and Topography in Brown 210
   
Figure 14-25 Abore Histogram and Basic Statistics of Samples Within the Grade Envelope, Au ≥ 0.3 g/t 210
   
Figure 14-26 Abore Histogram and Basic Statistics of Samples Within the Grade Envelope, Au < 0.3 g/t 211
   
Figure 14-27 Abore Histogram and Basic Statistics, Au grades, All 1 m Composites Inside the 0.3 g/t Au Envelope 212
   
Figure 14-28 Abore Probability Plot, Au, Inside the 0.3 g/t Au Mineralization Envelope 212
   
Figure 14-29 Abore Declustered Histogram and Basic Statistics, 50 m Cell Size, Au Grades, Inside the 0.30 g/t Au Envelope 213
   
Figure 14-30 Abore Average Au Grade Profiles Near Contact of the 0.2 g/t Envelope 214
   
Figure 14-31 Abore Summary Variogram Model, 0.30 g/t Au Indicator, 1 m Composites Inside the 0.30 g/t Envelope 214
   
Figure 14-32 Abore Au Grade Estimates, Level 157.5, Northern Area 216
   
Figure 14-33 Abore Au Grade Estimates, Level 157.5, Southern Area 216
   
Figure 14-34 Abore Au Grade Estimates, Cross Section 714170N 216
   
Figure 14-35 Abore Au Grade Estimates, Longitudinal Section 217
   
Figure 14-36 Abore Drift Plot, Au Grade Estimates (in Blue) vs Declustered Composites (Nearest Neighbor Model, in Orange) 218
   
Figure 14-37 Abore Summary Correlogram Model Parameters, Au Within the 0.3 g/t Au Grade Envelope 219
   
Figure 14-38 Abore Resource Classification, Longitudinal Section 221
   
Figure 14-39 Abore Resource Classification, Level 187.5m 221
   
Figure 14-40 Abore Measured and Indicated Grade-Tonnage Curves 223
   
Figure 14-41 3D View of the Nkran Geological Domains Within the June 2020 Mining Surface 225
   
Figure 14-42 Cross-section View of the Nkran Weathering Profiles and Geological Domains 225
   
Figure 14-43 Nkran Log Probability Plots Comparing Top-cut Au Grades in DDH, RC and RCD Drill Holes 227

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Effective Date: February 28, 2022


Figure 14-44 Nkran QQ Plots Comparing Au Grades in the Exploration Dataset (X axis) to the Dynamic RC GC Dataset (Y axis) for Western Sandstone (LHS) and Central Sandstone (RHS) 227
   
Figure 14-45 Nkran Log Probability Overlay plots of Uncut Au g/t within the Estimation Domains (ESTZON) 228
   
Figure 14-46 Nkran Gaussian Anamorphosis Models for ESTZON 210 (Left) and ESTZON 220 (Right) 232
   
Figure 14-47 Nkran Histogram of Au (Left) and Gaussian Transformed Au (Right) for ESTZON 210 232
   
Figure 14-48 Nkran Histogram of Au (Left) and Gaussian Transformed Au (Right) for ESTZON 220 232
   
Figure 14-49 Nkran Cross-section View - OK Panel Model and Composites (ESTZON 210 on Left, ESTZON 220 on Right) 234
   
Figure 14-50 Nkran Scatterplots Showing UC Panel Grade (x-axis) versus OK Panel Grade (y-axis) 236
   
Figure 14-51 Nkran GLOBAL Swath Plots and Histogram 236
   
Figure 14-52 Nkran ESTZON 210 (Western Sandstone) Swath Plots and Histogram 237
   
Figure 14-53 Nkran ESTZON 220 (Central Sandstone) Swath Plots and Histogram 237
   
Figure 14-54 Nkran Scatterplots Showing Mean LUC Grade of SMUs (x-axis) versus UC Grade (y-axis) Both at a Zero Cut-off. ESTZON 210 (Left) and ESTZON 220 (Right). 238
   
Figure 14-55 Nkran Grade (Left) and Tonnage Curves (Right) for ESTZON 210 with UC Model in Red and LUC in Green 238
   
Figure 14-56 Nkran Cross-section View of Classified Grade Model, Constrained within Nominal US$1,600/oz Au Pit Shell (Blue Outline) Bounded by the June 2020 Mining Surface (Black Outline) 239
   
Figure 14-57 Nkran 3D View of Classified Grade Model, View Towards NW. Nominal US$1,600/oz Pit Shell Shown in Blue 240
   
Figure 14-58 Nkran Grade-Tonnage Curve - All Mineralization 242
   
Figure 14-59 View of Akwasiso Exploration Drillholes 244
   
Figure 14-60 Akwasiso QQ Plots of Resolute and Asanko Drillhole Assays at < 5 m Distance 245
   
Figure 14-61 Akwasiso QQ Plots of GC and Asanko Exploration Drillhole 1.5 m Composites at < 5 m Distance 245
   
Figure 14-62 Akwasiso QQ Plots of GC Field Duplicate Assays vs. Original Assays 246
   
Figure 14-63 Plan and Sectional View of Akwasiso Lithology, Shear and Oxidation Model 247
   
Figure 14-64 Sectional View of Akwasiso Oxidation Model 247
   
Figure 14-65 Plan and Sectional View of Akwasiso Mineralization Model 248
   
Figure 14-66 Sectional View of Akwasiso Mineralization Model 249
   
Figure 14-67 Log Probability Plot of Akwasiso Exploration Drill Hole Assays Au Grade by Mineralization, Oxidation, and Lithology 250
   
Figure 14-68 Assays Log Probability Plots of Exploration Drill Holes by Domain 251
   
Figure 14-69 Log Probability Plot of Akwasiso Exploration Drill Hole 1.5 m Composite Au Grade by Mineralization Domain 253
   
Figure 14-70 Akwasiso Contact Graphs of Drillhole Assays Between Main Mineralization Domains 254
   
Figure 14-71 Akwasiso Contact Graphs of Drillhole Assays Between Oxidation Domains 255
   
Figure 14-72 3D Visualization of Variogram Ellipses for Akwasiso Domain 100, 210, 310 256

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Effective Date: February 28, 2022


Figure 14-73 Akwasiso Block Assignment of Domain Codes 257
   
Figure 14-74 Illustration of Akwasiso Search Ellipsoid (Domain 100 example) 258
   
Figure 14-75 Akwasiso Tonnage-Grade Comparison of EXP Model and GC Model in Mined-out Area 259
   
Figure 14-76 Akwasiso Swath Plot by Northing and Elevation for Block and Composite Au (g/t) of Main Domains 260
   
Figure 14-77 Illustration of Akwasiso 2021 Resource Classification and Block 3-Hole Average Distances 262
   
Figure 14-78 Akwasiso Tonnage - Grade Curve for Indicated Mineral Resources 264
   
Figure 14-79 Dynamite Hill Exploration and GC Drill Holes 265
   
Figure 14-80 Dynamite Hill Lithology and Oxidation Model (Inclined Long Sectional View of Granite Model) 267
   
Figure 14-81 Sectional View of Dynamite Hill Mineralization Model 268
   
Figure 14-82 Long Sectional View of Dynamite Hill Main Mineralization Model 268
   
Figure 14-83 Log Probability Plot of Dynamite Hill Exploration Drill Hole Assays Au Grade by Mineralization, Oxidation, and Lithology Model 269
   
Figure 14-84 Dynamite Hill Top-cut Analysis of Exploration Drill Holes Au Assays 270
   
Figure 14-85 Cell De-clustered Dynamite Hill Exploration Drillhole Composites Au Mean vs. Cell Size (Main Zone) 272
   
Figure 14-86 Dynamite Hill Domain 10 Composite Au Normal Score Variogram (Correlogram) Parameters 273
   
Figure 14-87 Example of Domain 10 GC Sample and Exploration Composite Au Normal Score Variogram (Correlogram) 273
   
Figure 14-88 Vertical Sectional View of Dynamite Hill Resource Block Model of Mineralization Domain 275
   
Figure 14-89 Dynamite Hill Accuracy Plot of 50 SGS Realizations 277
   
Figure 14-90 Dynamite Hill Statistical Comparison of SGS Realizations and Input Composites 277
   
Figure 14-91 Dynamite Hill Plan View of SGS Realization ausim01 Grade 278
   
Figure 14-92: Dynamite Hill Swath Plot by Easting, Northing, and Elevation for Block and Composite Au g/t of Domain 10 279
   
Figure 14-93 Dynamite Hill Block Model 3 - Hole Average Distances and Resource Classification 281
   
Figure 14-94 Dynamite Hill Tonnage - Grade Curve for Indicated Mineral Resources 282
   
Figure 14-95 Plan View of Miradani North Exploration Drillholes 283
   
Figure 14-96 Sectional View of Miradani North Exploration Drillholes 284
   
Figure 14-97 Plan View of Miradani North Lithology Model 285
   
Figure 14-98 Sectional View of Miradani North Lithology Model 286
   
Figure 14-99 Plan View of Miradani North Lithology Model 287
   
Figure 14-100 Sectional View of Miradani North Lithology Model 287
   
Figure 14-101 Log Probability Plot of Miradani Exploration Drillhole Assays Au Grade by Mineralization 288
   
Figure 14-102 Log Probability Plot of Miradani Exploration Drillhole Assays Au Grade by Oxidation and Lithology Model Inside Minzone 289

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Effective Date: February 28, 2022


Figure 14-103 Top-cut Analysis of Miradani Exploration Drillholes Au Assays 290
   
Figure 14-104 Contact Graphs of Drillhole Assays by Miradani Lithology and Mineralization Models 291
   
Figure 14-105 Cell De-clustered Miradani Exploration Drillhole Composites Au Mean vs. Cell Size 292
   
Figure 14-106 Miradani Domain 100 Composite Au Normal Score Variogram (Correlogram) Parameters 293
   
Figure 14-107 Miradani Domain 100 Drillhole Composite Au Normal Score Variogram (Correlogram) 293
   
Figure 14-108 Vertical Sectional View of Miradani North Resource Block Model of Mineralization Domain 295
   
Figure 14-109 Illustration of Miradani ID3 Estimation Search Orientations 297
   
Figure 14-110 Miradani Accuracy Plot of 50 SGS Realizations 298
   
Figure 14-111 Miradani Statistical Comparison of SGS Realizations and Input Composites 298
   
Figure 14-112 Miradani SGS Realization ausim03 Au Grade Compared to Variogram Model 299
   
Figure 14-113 Miradani Swath Plot by Easting, Northing, and Elevation for Block and Composite Au (g/t) for Domain 100 Indicated Class 300
   
Figure 14-114 Miradani Tonnage-Grade Comparison of LSMU and ID3 Estimates in Domain 100 301
   
Figure 14-115 Illustration of Miradani North 2021 Resource Classification 302
   
Figure 14-116 Miradani Plan View of Blocks Coloured by 3-Hole Average Distance to Block Centroids 302
   
Figure 14-117 Miradani North Tonnage - Grade Curve for Indicated Mineral Resources 304
   
Figure 14-118 Asuadai Lithological and Structural Models 306
   
Figure 14-119 Asuadai Material Type Models 307
   
Figure 14-120 Asuadai Preliminary Grade Analysis 308
   
Figure 14-121 Asuadai Mineralization Model 308
   
Figure 14-122 Asuadai Secondary Grade Analysis 309
   
Figure 14-123 Asuadai Material Type Analysis 311
   
Figure 14-124 Top Cap Selection Example 312
   
Figure 14-125 Asuadai Relative Variogram Models 314
   
Figure 14-126 Asuadai Block Model Coded Domains 315
   
Figure 14-127 Asuadai Validation of Gaussian Values 316
   
Figure 14-128 Asuadai Variogram Reproduction 317
   
Figure 14-129 Asuadai Data Distribution Reproduction 317
   
Figure 14-130 Asuadai Grade Tonnage Validation 317
   
Figure 14-131 Asuadai LSMU Model and Simulation Realizations 318
   
Figure 14-132: Classification Comparison on Section 709200mN 319
   
Figure 14-133 Asuadai Tonnage - Grade Curve for Indicated Mineral Resources 321
   
Figure 14-134 Plan View of Adubiaso Exploration Drillholes 322
   
Figure 14-135 Adubiaso Lithological and Structural Models (Section View) 323
   
Figure 14-136 Adubiaso Lithological and Structural Models (Plan View) 324
   
Figure 14-137 Adubiaso Mineralization Model (Cross-section View) 324

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Effective Date: February 28, 2022


Figure 14-138 Adubiaso Mineralization Model (Long-section View) 325
   
Figure 14-139 Adubiaso Domain Numbering Convention 326
   
Figure 14-140 Adubiaso Material Type Analysis 328
   
Figure 14-141 Adubiaso Cumulative Grade Frequency by Drill Hole Type 328
   
Figure 14-142 Adubiaso Topcap Selection Example 329
   
Figure 14-143 Adubiaso Plan View Showing Coded Block Model by Lithology Wireframes 331
   
Figure 14-144 Adubiaso Validation of Gaussian Values 333
   
Figure 14-145 Adubiaso Data Distribution Reproduction 333
   
Figure 14-146 Adubiaso Grade Tonnage Validation 334
   
Figure 14-147 Adubiaso Global Model Grade Tonnage Curve 334
   
Figure 14-148 Comparison of 2014 and Current Block Classification 335
   
Figure 14-149 Adubiaso Tonnage - Grade Curve for Indicated Mineral Resources 337
   
Figure 17-1 Process Plant Block Flow Diagram 341
   
Figure 18-1 Obotan Site Plan and Surrounding Infrastructure 351
   
Figure 18-2 Process Plant Layout 352
   
Figure 18-3 Esaase Site Infrastructure Layout 353
   
Figure 18-4 Asanko Gold Haul Road - Overall Site Infrastructure Layout 354
   
Figure 20-1 EIA Approach for the Esaase Project 363
   
Figure 20-2 Community Members at the EPA Public Hearing 365
   
Figure 20-3 A Cross Section of Chiefs and Members of the Community at the EPA Public Hearing 365
   
Figure 20-4 Reclamation of Native Timber Species and Food Crops 372
   
Figure 20-5 Tailings Storage Facility Stage 12 Layout 374
   
Figure 23-1 AGM Tenements and Adjacent Properties 382
   
Figure 26-1 Location of Sky Gold Tenements West of the Esaase Deposit, with Geology Interpreted From Regional Geophysics 389
   
Figure 26-2 Location of Recommended Areas for Gradient Array Survey 390
   
Figure 26-3 Longitudinal Section Through the Nkran Deposit Showing Multiple Shoot Trends That Hold Potential for Additional Resources 392
   
Figure 26-4 Cross-section Through the Nkran Deposit With Possible Deep Drilling Hole Traces 392
   
Figure 26-5 Longitudinal Section Through the Miradani North Deposit 393

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NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

1 SUMMARY

1.1 Introduction

Galiano Gold Inc. (the "Company" or "Galiano Gold") is a gold mining company listed on the TSX and NYSE, with headquarters at 1640-1066 West Hastings Street, Vancouver, British Columbia (https://www.galianogold.com/). The Company's flagship project is the jointly owned Asanko Gold Mine ("AGM"). Galiano Gold and Gold Fields Limited (JSE & NYSE: GFI) jointly each own a 45% interest in Asanko Gold Ghana Limited ("AGGL"), with the Government of Ghana retaining a 10% free-carried interest. The AGM concessions are owned 100% by Asanko Gold Ghana Limited.

The AGM is a large scale, multi-deposit gold asset, which is managed and operated by Galiano Gold. The mine was built in 2015, with first gold poured in January 2016, and commercial production commencing in April 2016. The AGM has produced an average of approximately 230,000 ounces (oz) of gold per year between 2017 to 2021 and had a record gold production of approximately 251,000 ounces in 2019. AGGL holds the largest land package on the highly prospective and underexplored Asankrangwa Gold Belt.

The AGM is a multi-deposit complex with two main deposits, Nkran and Esaase, six satellite deposits and a carbon-in-leach (CIL) processing plant with a current operating capacity of approximately 5.8 Mtpa.

This report is a National Instrument 43-101 (NI 43-101) Technical Report that summarizes the AGM and its updated Mineral Resources effective February 28, 2022. This NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana, with an effective date of February 28, 2022 ("Report") updates all material information on the AGM, is addressed to Galiano Gold,  supports the disclosure of updated Mineral Resource estimates and supports the scientific and technical content in Galiano Gold's Annual Information Form filing.

As at the effective date of this Report, Galiano Gold is not in a position to declare Mineral Reserves on the AGM property as a result of current metallurgical uncertainty of the Esaase material. AGM is in the process of investigating options for mitigating the issues, which will subsequently lead to a revised optimized mine plan. At that time, Galiano Gold will prepare an updated technical report supporting the new life of mine plan, based on Mineral Reserves.

Any references to "ore" apply to production during time periods when Mineral Reserves were stated.

The Report supersedes all previous technical reports.

1.2 Property Description and Ownership

Ghana is located in West Africa, sharing boundaries with Togo to the east, Cote d'Ivoire to the west, Burkina Faso to the north and the Gulf of Guinea to the south.

The country is known to hold a significant portion of West Africa's gold deposits and has long attracted investors looking to trade and invest in its mineral riches. According to recent global statistics on gold production, Ghana is the world's eighth and Africa's largest gold producer. In addition to gold, the country has other mineral resources such as manganese, bauxite, and diamonds. At the moment, gold is Ghana's most important export commodity, followed by cocoa and timber products.

The AGM tenements are in the Amansie West and South Districts, of the Ashanti Region of Ghana, approximately 250 km NW of the capital Accra and some 50 km to 80 km southwest of the regional capital Kumasi. The concessions cover an area of approximately 476 km2 between latitudes 6º 19'40" N and 6º 28' 40" N; and longitudes 2º 00' 55" W and 1º 55' 00" W.

The AGM concessions are owned 100% by Asanko Gold Ghana Limited. All mineral tenements are in good standing with the Government of Ghana. 


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

AGGL holds 7 mining leases, 9 prospecting licences and 1 reconnaissance licence which collectively make up the AGM property and span over a 40 km length of the Asankrangwa Belt. The AGM is made up of a series of contiguous concessions in the Obotan and Esaase area. These concessions cover a total area of 476 km2 and are summarized in Table 1-1.

Figure 1-1 Location of the Asanko Gold Mine Tenements

Source: Asanko Gold Mine, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 1-1 Asanko Gold Mine Mining Lease and Prospecting Concession Areas

Name

Mincom Ref#

Licence
area (km
2)

Type

Status/ Expiry date

Ownership

Abore

PL 6/352

28.47

Mining Lease

Valid-ML 4/2030

Asanko - 100 %

Abirem

PL 6/303

47.13

Mining Lease

Valid-ML 3/2026

Adubea

PL 6/310

13.38

Mining Lease

Valid-ML 4/2030

Miradani

PL 6/122

14.98

Mining Lease

Valid-ML 5/2025

Asanko - 100 %

Esaase

PL 6/8 Vol 8

27.03

Mining Lease

Application, All relevant documents and payment made for renewal of ML. Awaiting Ministerial Approval.

Jeni River

RL 6/21

27.37

Mining Lease

Application, All relevant documents and payment made for renewal of ML. Awaiting Ministerial Approval.

Kaniago

PL 6/307

25.5

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

Asanko - 100 %

New Obuase

PL 3/84

33.67

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

Datano

PL 6/32

53.78

Mining Lease

Valid-ML 5/2030

Mepom

Pl 6/245

2.37

Prospecting

Note 1

Asanko - 100 %

Dawohodo

PL 6/43

10.00

Prospecting

Valid-PL 12/2023

 

 

 

 

 

 

 

 

 

 

Asanko - 100 %

Sky Gold

RL 6/86

91.50

Reconnaissance

Application, All relevant documents and payment made for renewal of RL. Awaiting Ministerial Approval. Note 2

 

 

 

 

 

Kaniago

PL 6/289

25.27

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

  

 

Asanko - 100 %

Besease

PL.6/120

15.55

Prospecting

Valid-PL 12/2023

Mmooho

PL 6/352

5.70

Prospecting

Valid-PL 12/2023

Gyagyatreso

PL6/32

10.83

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

 

 

Amoaman

PL6/380

43.47

Prospecting

Valid-PL 11/2022

Note 1: Mepom License renewal pending since 2012. In process of being merged with Esaase ML

Note 2: License conversion from RL to PL pending since 2012.

All concessions carry a 10% free carried interest in favour of the Ghanaian government and as a result, the Ghanaian government holds a 10% interest in AGGL. All mining leases are also subject to a 5% Net Smelter Return (NSR) royalty payable to the Government of Ghana. In addition, the Adubea mining concession is subject to an additional 0.5% NSR royalty to the original concession owner. The Esaase mining lease is also subject to an additional 0.5% NSR royalty to the Bonte Liquidation Committee (BLC). The Akwasiso deposit on the Abirem mining lease is also subject to an additional 2% NSR royalty payable to the original concession owner.

1.3 Geology and Mineralization

The geology of Ghana is largely underlain by the West African craton. The craton consists of the Man-Leo (or Kénéma-Man) shield in the south (extending from Ghana to Senegal) and the Archaean Reguibat Shield in Mauritania to the north. They are separated by overlying younger sedimentary rocks of the Taoudeni Basin (see Figure 1-2).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 1-2 Simplified Map of the West African Craton, with Associated Gold Deposits (Modified from Goldfarb et al, 2017)

Note: Numbers 1 to 9 outline the different Archean, Proterozoic, and Hercynian domains: 1 = Eglab, 2 = Yetti, 3 = Daomeyan, 4 = Baoulé-Mossi, 5 = Kenema-Man, 6 = Kédougou-Kénébia Inlier, 7 =Rokelides, 8 = Bassarides, 9 = Mauritanides

At the regional scale, the AGM deposits are in the Paleoproterozoic Birimian Supergroup within the Man-Leo Shield in the southeast West Africa Craton. The Birimian Supergroup rocks consist of five NNE-trending greenstone belts composed of calc-alkaline or tholeiitic volcanic rocks separated by wide intervening sedimentary basins formed during two major orogenic phases between 2.25 to 2.15 Ga and 2.12 to 2.06 Ga. Magmatic episodes affecting the Birimian Supergroup rocks include Tonalite-Trondhjemite-Granodiorite emplacement (2.17-2.21 Ga), Granodiorite and Granite intrusions (2.12 and 2.09 Ga), and Granite intrusions (2.11 to 2.07 Ga).

Orogenic gold mineralization in the Birimian Supergroup occurs as quartz-vein-hosted and disseminated sulphide most developed between 2.2 Ga and 1.8 Ga. Peak gold mineralization in the West African Craton occurred at approximately 2.15-2.10 Ga and produced very large (>10 Moz) gold deposits associated with regional northeast-southwest trending shear zones.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 1-3 Regional Geology of Southwest Ghana Around AGM Concessions

Source: Ghana Geological Survey; CJM, 2014

At the local scale, the AGM deposits are in the Asankrangwa Gold Belt, a complex of northeast-trending shear zones along the central axis of the Kumasi Basin, which is one of the intervening basins between the greenstone belts. The Kumasi Basin is heavily faulted and consists of an isoclinally folded sequence of metasedimentary rocks. The basin is bound to the southeast by the Ashanti Fault/Shear and the Bibiani shear to the northwest. The regional 35-40° trending Nkran Shear, a zone of about 15 km in width, traced on a northeast to southwest trend for some 150 km hosts the Nkran, Asuadai, Dynamite Hill, and Akwasiso deposits. The parallel Esaase Shear Corridor hosts the Esaase, Adubiaso, and Abore deposits. The Miradani Shear Corridor hosts the Miradani deposit.

At the property scale, the AGM deposits are hosted along a 7 km wide and 50 km long segment of the Asankrangwa structural corridor locally coincident with magnetic lows and jogs along the NE trending shears. Quartz veins and disseminated sulphides are hosted in rocks ranging from granite and tonalite to sandstone, siltstone, and shale. Structural controls on gold mineralization include linking, conjugate, and tensional quartz veins associated with D2 shears.

1.4 Exploration and Drilling

Systematic exploration at the Asanko Gold Mine concessions includes regional generative and near mine programs, targeting new gold deposits as well as further delineation of Mineral Resources.

Multiple soil geochemical surveys have been undertaken on the AGM licences by various explorers. Since 2017, a total of 1,246 surface geochemical samples (grab, soil, stream sediment) have been taken across the AGM concessions with the focus on generation of greenfield targets.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Geophysical surveys over the property have included regional aeromagnetic imaging of the Ashanti Belt and adjacent Kumasi Basin by the Ghana Geological Survey, as well as induced potential (IP) ground geophysical surveying and airborne VTEM and magnetic survey centred over specific targets.

Surface drilling at the AGM includes reverse circulation (RC), diamond drill hole (DDH) and reverse circulation with diamond tail (RCD). Drilling for Mineral Resource delineation focused on Nkran, Esaase, Miradani North, Dynamite Hill and Abore, although extensive drilling has also been undertaken at Akwasiso and Adubiaso. To date, a combined total of 4,773 aircore, DDH, RC, and RCD drill holes totalling 652,425 m have been drilled at the AGM deposits.

1.5 Metallurgical Testwork and Recoveries

1.5.1 Esaase

The 2021 testing (ALS report A22281) returned recovery results for the bulk composites that align with those from the 2018/19 testwork programs. As such, no change has been made to the recovery estimates as per the Asanko Gold NI 43-101 Technical Report (2020) for the purpose of constraining the current Mineral Resource estimate.

These recovery estimates, based on lithological source/type, are calculated according to the equations in Table 1-2. The recovery estimates are of sufficient confidence to determine reasonable prospect for eventual economic extraction; however, in light of recent plant performance of the Esaase material, further understanding of the Esaase metallurgical variability is required to have sufficient confidence to declare Mineral Reserves.

Table 1-2 Head Grade Recovery Model Correlations

Material Source

Head Grade Recovery
Correlation

M (slope)

C (coefficient)

Upper (Fresh/Trans)

y = 9.600ln(x) + 82.260

9.60

82.26

Cobra (Fresh/Trans)

y = 15.532ln(x) + 56.020

15.5

56.02

Central (Fresh/Trans)

y = 6.202ln(x) + 85.792

6.20

85.79

Python (Fresh/Trans)

=upper

9.60

82.26

Other (Fresh/Trans)

=upper

9.60

82.26

Material Type

Residue Value Au (g/t)

Esaase Oxides*

0.10

Recovery Discount Factor (due to Soluble Gold Losses & Carbon Losses)

0.5%

Note: * A fixed residue grade has been applied to the Esaase Oxide material

Although the variability composites testing completed in 2021 (A22281) indicated an upside to these recovery estimates, the results are not applied herein. The rationale behind deferring reliance on the higher recoveries obtained in the testing is twofold:

1. Current plant performance is yielding lower recoveries than previously modelled in equivalent spatial locations within the Esaase deposit. The deviation between actual plant performance and modelled recovery will need to be further examined to determine the cause and the extent to which this may persist within the deposit

2. The variability testing, although indicative of an upside to 90.1% average recovery, may require revised plant operating protocols

The Company is working to better understand the cause(s), magnitude and impact of the observed lower recovery, and to quantify the magnitude of benefits from a series of opportunities that have been identified. Previous metallurgical testwork demonstrated significant improvements in gold recovery from preg-robbing material through kerosene or diesel pre-conditioning, followed by addition of fresh or regenerated activated carbon.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

1.5.2 Nkran

Past gold recoveries from processing of the Nkran ore (2017 to 2019) averaged 94%. By way of confirmation testing, a suite of 7 diamond drill (DD) (half split of HQ diamond core) intervals were dispatched to ALS, Perth. Lithologies tested included granites (2), sandstones (4) and siltstone (1).

The simple average recovery from these tests was 95.3%. Allowing a 0.3% discount for operational losses, the resultant 95% recovery confirms the past processing results (94%) may be applied for further Nkran material processing.

1.5.3 Abore

A suite of metallurgical testwork was undertaken in 2021 on 7 DD core composites at ALS, Perth. The objective was to confirm that recoveries would align with those of past performance. Resolute mining and processing activities in 2002 returned overall recovery of 95%.

A total of 124 m of core was dispatched, with each interval composite averaging 18 m in length. Six of the composites were classified as granite while the seventh as a blend of granites (27%) and sandstones (73%). Granites constitute an estimated 85% of the Abore fresh ore zone tonnage.

The average recovery from these tests stands at 93.3% which includes a deduction for losses in processing. Taking into account past production recoveries realized by Resolute in the oxide and transitional zones yield overall recoveries of 95%. 94% recovery value is considered reasonable for the overall Abore recovery.

1.5.4 Miradani North

A total of 259 x 1 m core samples from 11 drill holes were delivered to ALS, Perth in June of 2021. Samples were selected based on available HQ drill core and considered mineralized lithologies which are predominantly in the intrusives (granites/tonalites) and the sediments along its peripheries (sandstones, siltstones, and intercalations of the two).

Results averaged 97.2% for oxide, 94.0% for transition, and 93.4% for fresh material. An overall value of 94% recovery value is concluded for the Miradani North material.

1.5.5 Akwasiso

Akwasiso represents a smaller scale version of Nkran, with mineralization hosted in shears on siltstone/sandstone contacts, and around and within the granitic intrusive. Strong alteration zones are associated with higher grades around the sandstone-granite contact. Mineralization is hosted in the sandstone unit with gold occurring within quartz-carbonate veins, similar to the other deposits in the belt.

Akwasiso is currently being fed to the process plant as a minor tonnage contributor along with the predominant Esaase mill feed. A 94% gold recovery value is attributed to this small satellite deposit.

No new testwork was conducted for the Akwasiso deposit.

1.5.6 Dynamite Hill

Dynamite Hill ore had been processed between November 2017 and August 2019. This was complementary to the main mill feed sourced from the Nkran pit and was at no stage processed in isolation.

Overall plant recoveries averaged 94% during this period, regardless of the Dynamite Hill component. The attributable recovery from future mill feed is therefore assumed to be in line with past production at 94%.

No new testwork was conducted for the Dynamite Hill deposit.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

1.5.7 Adubiaso

Adubiaso ore had been mined and processed through the Resolute plant from November 1999 to December 2000. The ore was complimentary mill feed to that of Nkran ore. Over the period Adubiaso ore accounted for an average of 34% of the mill feed tonnage.

During this period, gold recoveries were slightly greater than 96%. A slightly conservative gold recovery of 94% has been applied for future performance from this pit.

No new testwork was conducted for the Adubiaso deposit.

1.6 Mineral Resource Estimates

The effective date of the Mineral Resource is February 28, 2022, and comprises eight deposits, which have been combined into a global Mineral Resource table (Table 1-3).

Table 1-3 Summary of the Mineral Resource at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

 

Measured

Indicated

Measured + Indicated

Inferred

 

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Deposit

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

Nkran

 

 

 

12.1

2.09

814

12.1

2.09

814

1.3

2.23

96

Esaase

10.9

1.25

437

11.7

1.27

475

22.6

1.26

912

0.6

1.22

25

Akwasiso

 

 

 

1.7

1.31

69

1.7

1.31

69

0.2

1.46

7

Abore

3.2

1.46

150

5.1

1.23

203

8.3

1.32

353

1.1

1.55

55

Adubiaso

 

 

 

1.6

1.80

90

1.6

1.80

90

0.2

1.38

9

Asuadai

 

 

 

1.6

1.29

67

1.6

1.29

67

0.0

1.17

1

Miradani

 

 

 

7.1

1.28

293

7.1

1.28

293

2.6

1.21

102

Dynamite

 

 

 

1.9

1.39

85

1.9

1.39

85

0.3

1.26

14

Stockpiles

9.5

0.72

221

 

 

 

9.5

0.72

221

 

 

 

Total

23.6

1.06

808

42.7

1.53

2,096

66.4

1.36

2,904

6.4

1.49

309

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion up to and including February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software at gold price of $1,600/oz. Mining, G&A, processing costs, and process recovery are dependent on deposit and detailed in the respective deposit sections.

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

The Mineral Resource estimates for the Esaase and Abore deposits have been prepared by Mario E. Rossi, FAusIMM, SME, IAMG, and Principal Geostatistician of Geosystems International Inc. Mr. Rossi is independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.

The Mineral Resource estimate for Nkran has been prepared by Malcolm Titley, MAIG, MAusIMM who is a Principal Consultant of CSA Global. Mr. Titley is independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The Mineral Resource estimates for Akwasiso, Miradani North, and Dynamite Hill have been prepared by Eric Chen, P.Geo. who is Galiano Gold’s former Vice President of Technical Services. The Mineral Resource estimates for Adubiaso, Asuadai and Stockpiles have been prepared by others and reviewed and accepted by Mr. Chen. Mr. Chen is not independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.

1.7 Mineral Reserves

At the time of the effective date of this Report, there remains an uncertainty in the variability of metallurgical recovery of gold from the Esaase deposit. Although all metallurgical testwork to date indicate predictable trends in the recovery of gold from the Esaase deposit, recent mill feed consisting of primarily Esaase material has demonstrated lower recovery. As a result, the Company has concluded that there is insufficient confidence in the understanding of the Esaase metallurgical variability to estimate Mineral Reserves.

Given the uncertainty of metallurgical performance on the Esaase material, Galiano Gold has decided not to state Mineral Reserves for all deposits. Any plant feed in the short term will have significant Esaase material present and overall recovery would therefore be difficult to predict.

Only the Esaase material is believed to be performing adverse to expectations. Recovery of gold from Nkran and all other satellite deposits remain of sufficient confidence, but will be subject to additional metallurgical testwork. Upon conclusion of the planned metallurgical testwork, Galiano Gold will prepare an updated technical report supporting an optimized life of mine plan, based on Mineral Reserves. 

1.8 Mineral Processing

The existing AGM process plant located at Obotan is capable of processing approximately 5.8 Mtpa of total mill feed. Esaase material is being processed at present with supplementary feed from Akwasiso.

The key process operating criteria are shown in Table 1-4 and the process block flow diagram in Figure 1-4.

Table 1-4 Process Plant Operating Criteria

Parameter

Units

Value

Crushing plant running time

Hours/annum (hpa)

5,957

Crushing plant feed rate

Tonnes per hour (tph)

975

Milling and carbon in leach (CIL) plant running time

hpa

7998

Milling and CIL plant feed rate

tph

725

Life of Mine (LOM) Au head grade

g/t

1.38

LOM gravity gold recovery

%

50

Run of Mine (ROM) feed size (F100)

mm

800

Semi-autogenous (SAG) mill feed size (F100)

mm

270

SAG mill feed size (P80)

mm

90

Leach feed size (F80)

µm

106

CIL retention time (8 stages)

hr

17.4

CIL slurry feed density

% w/w

50.2

CIL feed gold grade

Au g/t

0.69

LOM average CIL cyanide (NaCN) consumption

kg/t

0.45

LOM average lime (CaO) consumption

kg/t

0.98

Elution circuit type

 

Split AARL

Elution circuit size

t

5

Frequency of elution

batches/day

2

Note: AARL - Anglo American Research Laboratories


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 1-4 Process Plant Block Flow Diagram

1.9 Infrastructure

The process plant commenced production in early 2016 and was erected close to the Nkran deposit and several satellite orebodies. The plant is currently processing approximately 5.8 Mtpa of material.

Current site infrastructure at Obotan includes:

Current infrastructure at Esaase includes:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

1.10 Environmental

Two key regulatory permits were required for the AGM as follows:

Following the required engagements, regulatory site visits, and submission of the relevant documentation, the AGM has successfully obtained and renewed its Mine Operating Permits since commencement of operation in 2016 and is currently operating under the 2021 MOPs issued on January 12th, 2021 in respect of the following leases, all of which form part of the operational complex of the Asanko Gold Mine:

The latest Environmental Certificate for the AGM (gold mining and mineral processing) was issued on July 30th, 2021 and is valid for three years following which it will be due for renewal.

The AGM is currently implementing a preventative approach to environmental management with the primary objective of avoiding negative environmental impacts from the operational activities, whilst maximising positive benefits. Where inevitable, the AGM seeks to minimize such negative impacts through appropriate mitigation measures. This approach fulfils the aspirations of the corporate policy on the environment, environmental performance management systems, and various impact-specific environmental action plans.

The AGM's reclamation objective is to ensure that the site is left in a condition that is safe and stable where long-term environmental impacts are minimized and any future liability to the community and future land use restrictions are minimized.

The final post-mining land use will be determined in consultation with the EPA, other Ghanaian government institutions, stakeholders, and local communities. Natural soil covers and vegetation will as far as possible be re-established over the disturbed areas.

1.11 Risks and Opportunities

The following risks have been identified:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The following opportunities have been identified:

1.12 Conclusions and Recommendations

The AGM is a large scale, multi-deposit gold asset that is managed and operated by Galiano Gold. Since declaring commercial production, the AGM has produced on average 230,000 oz of gold per year, with record production of approximately 251,000 oz in 2019. AGGL holds the largest land package of the highly prospective and underexplored Asankrangwa Gold Belt.

As at the effective date or the report, the AGM comprises of eight deposits which contain 2.9 Moz Au of measured and indicated Mineral Resources, and 0.3 Moz Au of inferred Mineral Resources.

As at the effective date of this Report, Galiano Gold is not in a position to declare Mineral Reserves on the AGM property as a result of current metallurgical uncertainty of the Esaase material. AGM is in the process of investigating options for mitigating the issues, which will subsequently lead to a revised optimized mine plan. At that time, Galiano Gold will prepare an updated technical report supporting the new life of mine plan, based on Mineral Reserves.

This will be facilitated by the fact that the AGM is an established operation with a processing plant, site infrastructure, permits, and organizational capability already in place to readily support a future LOM.

Additional work programs are taking place concurrently to optimize capital and operating costs, ensure best practices in relation to the size and scope of the operations, infill drilling to improve the confidence in the Mineral Resource estimates, and drill mid- and long-term exploration prospects to accelerate addition of new Mineral Resources and provide more flexibility in mine planning.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

2 INTRODUCTION

2.1 Terms of Reference

The Company is a gold mining company listed on the TSX and NYSE, with headquarters at 1640-1066 West Hastings Street, Vancouver, British Columbia (https://www.galianogold.com/). The Company's flagship project is the jointly owned Asanko Gold Mine. Galiano Gold and Gold Fields Limited (JSE & NYSE: GFI) jointly each own a 45% interest in Asanko Gold Ghana Limited, with the Government of Ghana retaining a 10% free-carried interest. The AGM concessions are owned 100% by Asanko Gold Ghana Limited.

The AGM is a large scale, multi-deposit gold asset, which is managed and operated by Galiano Gold. The mine was built in 2015, with first gold poured in January 2016, and commercial production commencing in April 2016. The AGM has produced an average of approximately 230,000 ounces of gold per year between 2017 to 2021 and had a record gold production of approximately 251,000 ounces in 2019. AGGL holds the largest land package on the highly prospective and underexplored Asankrangwa Gold Belt.

The AGM is a multi-deposit complex with two main deposits, Nkran and Esaase, six satellite deposits and a carbon-in-leach processing plant with a current operating capacity of approximately 5.8 Mtpa.

This Report is a National Instrument 43-101 Technical Report that summarizes the AGM and its updated Mineral Resources effective February 28, 2022. This Report updates all material information on the AGM, is addressed to Galiano Gold, supports the disclosure of updated Mineral Resource estimates and supports the scientific and technical content in Galiano Gold's Annual Information Form filing.

As at the effective date of this Report, Galiano Gold is not in a position to declare Mineral Reserves on the AGM property as a result of current metallurgical uncertainty of the Esaase material. AGM is in the process of investigating options for mitigating the issues, which will subsequently lead to a revised optimized mine plan. At that time, Galiano Gold will prepare an updated technical report supporting the new life of mine plan, based on Mineral Reserves. 

Any references to "ore" apply to production during time periods when Mineral Reserves were stated.

The Report supersedes the following historical reports:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

2.2 Qualified Persons

The list of Qualified Persons involved in the compilation of this Report are shown below:

Name:

Richard Miller, P.Eng.

Company:

Galiano Gold Inc.

Date of Last Site Visit:

October 14 to 21, 2021

Sections:

1.1, 1.2, 1.7, 1.9 to 1.12, 2, 3, 4, 5, 15, 16, 18, 19, 20.1 to 20.8, 21, 22, 24, 25.1, 25.2, 25.6, 25.9, 25.10, 26.4, 27

Details of Visit:

Mr. Miller visited the property from October 14 to 21, 2021. During this personal inspection of the property, he participated in sustainability, operational and technical services meetings, 2022 budget presentations, and attended technical trips to see existing infrastructure and each of the mining areas.

 

 

Name:

Greg Collins, MAusIMM(CP)

Company:

Galiano Gold Inc. (Former)

Date of Last Site Visit:

October 12 to November 4, 2021

Sections:

1.3, 1.4, 6, 7, 8, 9, 10, 11, 12, 23, 25.3, 25.4, 26.3

Details of Visit:

Mr. Collins' initial site visit was from February 10 to May 5, 2021. During this personal inspection of the property, he visited all main exploration sites, drill rigs, logging and sample preparation facilities. He also participated in budget presentations and site based operational meetings. Most recent visit to site was October 12 to November 4, 2021 to conduct similar work.

 

 

Name:

Eric Chen, P.Geo

Company:

Galiano Gold Inc. (Former)

Date of Last Site Visit:

September 14 to 30, 2021

Sections:

1.6, 12.1, 14.0, 14.4, 14.5, 14.6, 14.7, 14.8, 25.5, 26.2

Details of Visit:

Mr. Chen most recently visited the property on September 14 to 30, 2021. During this personal inspection of the property, he participated in LOM and budget reviews, and conducted reviews of the grade control process, reconciliation, short-term planning, pit mapping, grade control modelling, sampling procedures, and mine geology data management. He also reviewed Esaase drill core re-logging, geology and geometallurgical modelling, metallurgical sampling and recovery modelling for the AGM deposits.

 

 

Name:

Alan Eslake, FAusIMM

Company:

Asanko Gold Ghana Limited

Date of Last Site Visit:

Resides on Site

Sections:

1.5, 1.8, 13, 17, 25.7, 25.8, 26.1

Details of Visit:

Mr. Eslake has been site based since December 2020. His areas of focus include production enhancement projects and supervision of both internal and external metallurgical testwork programs.



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Name:

Mario E. Rossi, FAusIMM

Company:

GeoSystems International Inc.

Date of Last Site Visit:

March 18 to April 1, 2021

Sections:

14.1, 14.2, 25.5

Details of Visit:

Mr. Rossi visited the property from March 18 to April 1, 2021. During this personal inspection of the property, he participated in operational and technical services meetings related to the Esaase deposit; visited the Esaase mine operation; viewed mineral exposures in the pit; visited the core storage facility; and had discussions regarding data used in the geologic and resource models, as well as the reconciliation (production) data from the mine. He also visited other Asanko Gold deposits in the area, specifically Abore and Nkran.

 

 

Name:

Malcolm Titley, MAusIMM, MAIG

Company:

CSA Global Ltd.

Date of Last Site Visit:

January 16 to 22, 2020

Sections:

14.3, 25.5

Details of Visit:

Mr. Titley most recently visited the property from January 16 to 22, 2020. During this personal inspection of the property, he participated in operational and technical services meetings and focused on analysis and site personnel training for end-of-month reconciliation processes and results. Mr. Titley completed technical trips to review sampling and geology mapping process at each of the mining areas.

 

 

Name:

Benoni Owusu Ansah, P.E., MGhIE, MASCE, MGGS, MGhIGS

Company:

Knight Piésold (West Africa)

Date of Last Site Visit:

December 16, 2021

Sections:

20.9

Details of Visit:

Mr. Ansah conducts regular visits since 2019 for various design, construction, and safety audits, with most recent visit on December 16, 2021. During this personal inspection of the property, he provided engineering and construction QAQC to support the ongoing TSF Stage 6 Expansion. He also observed performance of the active TSF (Stage 5 Basin) relative to design/operation intent.

2.3 References and Information Sources

All references and information sources are listed in Sections 3 and 27.

Mineral tenure, legal and environmental information on the Asanko Gold Mine was prepared by subject matter experts under the supervision of Frederick Attakumah, Executive Vice President and Managing Director for Asanko Gold Ghana Limited. This information provided the basis of the expert report referenced in Section 3.1.

2.4 Units, Currency and Abbreviations

Unless otherwise stated, all currencies are expressed in US dollars (US$), with metric units applied throughout this Report.

'Section' and 'Item' have been used interchangeably in this Report.

Abbreviations and units are shown in Table 2-1.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 2-1 Abbreviations and Unit of Measurement

Abbreviation/Unit
of Measurement

Description

%

Percent

% w/w

% of Solids Mass In Liquid Mass

°

Degrees

°C

Degrees Celsius

µm

Micron

2.5H:1V

2.5 Horizontal: 1 Vertical

3D

Three-Dimensional

AAGM

Akrokerri-Ashanti Gold Mines

AARL

Anglo American Research Laboratories

AAS

Atomic Absorption Spectrometry

AB

Air Blast

ABR

Abore

AC

Activated Carbon

ADU

Adubiaso

AERC

African Environmental Research and Consulting

AG

Auger

Ag

Silver

AGA

Anglogold Ashanti

AGF

Associated Gold Fields

AGGL

Asanko Gold Ghana Limited

AGM

Asanko Gold Mine

AHP

Analytical Hierarchy Process

AIG

Australian Institute of Geoscientists

AKW

Akwasiso

ALS

Australian Laboratory Services (Pty) Limited

ANCOLD

Australian National Committee on Large Dams

ARD

Acid Rock Drainage

As

Arsenic

ASU

Asuadai

Au

Gold

AusIMM

Australasian Institute of Mining and Metallurgy

BAIS

Best Applicable Industry Standards

BD

Bulk Density

BGM

Bonte Gold Mines

BIF

Banded Iron Formation

BLC

Bonte Liquidation Committee

BLEG

Bulk Leach Extractable Gold

BOCO

Base of Complete Oxidation

BV

Bed Volume

CGSC

Corporate Geoscience Group

CIC

Community Information Centres



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Abbreviation/Unit
of Measurement

Description

CIL

Carbon In Leach

CIM

Canadian Institute of Mining, Metallurgy and Petroleum

cm

Centimetre(s)

CMP

Composite

CN

Cyanide

CNWAD

Weak Acid Dissociable Cyanide

COEF

Coefficient

COG

Cut-off Grade

Corg

Organic Carbon

COS

Coarse Ore Stockpile

CP

Competent Person

CRM

Certified Reference Material

CSL

Compacted Clay Liner

CSV

Comma Separated Value

CTS

Central Technical Services

Cu

Copper

CV

Coefficient of Variation

DC

Diamond Core

DD

Diamond Drill

DDH

Diamond Drill Hole

DFS

Definitive Feasibility Report

DH

Drill Hole

DI

Diorite

DMP

Dust Management Plan

EBSZ

Eastern Bounding Shear Zone

ECG

Electric Company of Ghana

EGL

Equivalent Grinding Length

EIA

Environmental Impact Assessment

EIS

Environmental Impact Study

EM

Electromagnetic

EMP

Environmental Management Plan

EMS

Environmental Management Systems

EOH

End of Hole

EOM

End of Month

EPA

Environmental Protection Agency

EPMA

Electron Probe Microanalysis

ESE

East-South-East

ESIA

Environmental and Social Impact Assessment

ESM

Esaase Main

ESS

Esaase South

EV

Eastern Vein

EXP

Exploration



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Abbreviation/Unit
of Measurement

Description

FEL

Front End Loader

FS

Feasibility Study

g

Gram(s)

gm.m

Gold Gram Meters

G&A

General and Administration

g/cm3

Grams Per Cubic Centimetre

g/t

Grams Per Tonne

Ga

Giga-Annum

GC

Grade Control

GDP

Gross Domestic Product

GFI

Gold Fields Limited

GIS

Geographic Information System

GIT

Goods In Transit

GPS

Global Positioning System

GTG

Gold Technology Group (At Curtain University)

GV

Galamsey Vein

h

Hour(s)

ha

Hectare(s)

HDPE

High Density Polyethylene

HOD

Head of Department

HSE

Health, Safety, and Environment

ICMC

International Cyanide Management Code

IEC

International Electrotechnical Commission

IFC

International Finance Corporation

IFRS

International Financial Reporting Standards

IK

Indicator Kriging

ILR

Intensive Leach Reactor

IMOK

Indicator-Modified Ordinary Kriging

IP

Induced Potential

ISO

International Standards Organization

IT

Information Technology

ITRP

Independent Tailings Review Panel

JORC

Joint Ore Reserves Committee

JORC Code, 2012

Current Australasian Code for The Reporting of Mineral Resources and Ore Reserves (The JORC Code, 2012 Edition)

JSE

Johannesburg Stock Exchange

JV

Joint Venture

Keegan

Keegan Resources Inc (name changed to Asanko Gold In February 2013)

kg

Kilogram

kg

Kilogram(s)

kg/hr

Kilograms Per Hour

KIR

Kiwi International Resources

kL

Kilolitre



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Abbreviation/Unit
of Measurement

Description

Km

Kilometre(s)

KNA

Kriging Neighbourhood Analysis

Knight Piésold

Knight Piésold (Pty) Limited

koz

Kilo Ounce/Thousand Ounce (Troy)

KRGL

Keegan Resources Ghana Limited

kt

Thousand Tonnes

kW

Kilowatt

L

Litre

LHS

Left Hand Side

LOM

Life of Mine

LUC

Localized Uniform Conditioning

m

Metre(s)

m2

Square Metre(s)

m3

Cubic Metre(s)

Ma

Million Years

MAMSL

Metres Above Mean Sea Level

masl

Metres Above Sea Level

MDS

Maxwell DatashedTM

MIK

Multiple Indicator Kriging

mm

Millimetre(s)

MOP

Mine Operating Permit

MRE

Mineral Resource Estimate

MRev

Mineral Reserve Estimate

mRL

Reduced Level/Depth or Height of A Place (in m) Above a Reference Datum or Mean Sea Level

Mt

Million Tonnes

Mtpa

Million Tonnes Per Annum

NGL

Natural Ground Level

NI 43-101

Canadian Securities Administrators National Instrument 43-101 Standards of Disclosure for Mineral Projects

NPV

Net Present Value

NSR

Net Smelter Revenue

NYSE

New York Stock Exchange

OC

Organic Carbon

OK

Ordinary Kriging

OPEX

Operating Expenditure

oz

Ounce (Troy)

oz Au

Ounce of Gold

PAG

Potentially Acid Generating

Pb

Lead

PCD

Pollution Control Dam

PDC

Process Design Criteria

PFC

Power Correction Factor

PFS

Prefeasibility Study



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Abbreviation/Unit
of Measurement

Description

pH

Activity of Hydrogen Ions

PLS

Pregnant Leach Solution

PMI

PMI Gold Corporation

ppm

Parts Per Million

PRI

Preg-Robbing Index

Project

Mineral Resources, Exploration Activities, and the Existing Mine Facilities at the Asanko Gold Mine

PRV

Preg-Robbing Value

PSA

Pressure Swing Absorption

PVC

Polyvinyl Chloride

Q1, Q2, Q3, Q4

Quarter One, Quarter Two, Quarter Three, Quarter Four

QA

Quality Assurance

QA/QC

Quality Assurance/Quality Control

QC

Quality Control

QEMSCAN

Quantitative Evaluation of Materials by Scanning Electron Microscopy

QP(s)

Qualified Person(s)

QQ

Quantile-Quantile

QSP

Quartz Sericite Pyrite

Qtz

Quartz

QV

Quartz Veins

RAP

Resettlement Action Plan

RC

Reverse Circulation

RCD

Reverse Circulation with Diamond Tail

Resolute

Resolute Mining Limited

RF

Revenue Factor

RHS

Right Hand Side

RO

Reverse Osmosis

ROM

Run of Mine

RQD

Rock Quality Designations

RSA

Reclamation Security Agreement

SABC

Semi-Autogenous and Ball Milling Circuit

SAG

Semi-Autogenous Grinding

Sametro

Sametro Company Limited

Sb

Antimony

SBM

Sub-Celled Block Model

SD

Standard Deviation(s)

SE

South-East

SEC

U.S. Securities and Exchange Commission

SER

Slip Energy Recovery

SGS

SGS Laboratories

SIB

Stay-In-Business Capital

SiO2

Silicon Dioxide (Silica)

SMBS

Sodium Meta-Bisulphite



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Abbreviation/Unit
of Measurement

Description

SMU

Selective Mining Unit

SOX

Strongly-Oxidized

SQL

Structured Query Language

SRF

Social Responsibility Forum

SRK

SRK (South Africa) (Pty) Ltd

SS

Stainless Steel

SSW

South-South-West

SW

South-West

t

Tonne(s)

t/m3

Tonnes Per Cubic Metre

TOFR

Top of Fresh Rock

Tpa

Tonnes Per Annum

TSF

Tailings Storage Facility

TSX

Toronto Stock Exchange

TWL

Transworld Laboratories

u/f

Underflow

UCS

Unconfined Compressive Strength

US$

United States Dollars

VRA

Volta River Authority

VTEM

Versatile Time-Domain Electromagnetic Surveying

WBSZ

Western Bounding Shear Zone

WNW

West-North-West

WOX

Weakly-Oxidized

WRD

Waste Rock Dump

WRDF

Waste Rock Dump Facility

XRD

X-Ray Diffraction

XRF

X-Ray Fluorescence

Zn

Zinc



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

3 RELIANCE ON OTHER EXPERTS

For the purpose of this Report, the QPs have relied on other experts for information regarding mineral rights, surface rights, agreements, political, environmental, permits, and tax content as noted below.

3.1 Mineral Tenure, Surface Rights, Agreements, and Environmental Information

The QPs have not reviewed the mineral tenure, nor verified the legal status, ownership of the property or underlying property agreements, and environmental information, including permits. As such, the QPs have fully relied upon, and disclaim responsibility for information derived from Company experts through the following document:

This document includes information concerning property licenses and mineral tenure, legal status, permits, royalties, and environmental. This information is used in Sections 4 and 20 of the Report.

This information was prepared by the appropriate subject matter experts employed by Asanko Gold Ghana Limited under the supervision of the Frederick Attakumah, Executive Vice President and Managing Director of Asanko Gold Ghana Limited.

3.2 Political Information

The QPs have not reviewed the political matters relevant to the Technical Report. As such, the QPs have fully relied upon, and disclaim responsibility for information derived from the following document:

This document is considered a credible source for international mining industry consensus on the overall political risk facing an exploration or mining project in Ghana. This information is used in Section 4.6 of the Report.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

4 PROPERTY DESCRIPTION AND LOCATION

Ghana is located in West Africa, sharing boundaries with Togo to the east, Cote d'Ivoire to the west, Burkina Faso to the north and the Gulf of Guinea to the south.

The country is known to hold a significant portion of West Africa's gold deposits and has long attracted investors looking to trade and invest in its mineral riches. According to recent global statistics on gold production, Ghana is the world's eighth and Africa's largest gold producer. In addition to gold, the country has other mineral resources such as manganese, bauxite, and diamonds. At the moment, gold is Ghana's most important export commodity, followed by cocoa and timber products.

Ghana has an estimated population of 31.9 million (2021 estimate) and covers an area of approximately 238,530 km².

Ghana's population is ethnically diverse. The Akans are the largest, accounting for 44% of the population. Other significant ethnic groups include the Mole-Dagdani (16%), Ewe (13%), Ga-Adamgbe (18%), Gruma (4%), and Grussi (2%). The remainder is made up of a number of smaller ethnic groups. Despite the popularity of these languages, English, a legacy of British colonial rule, has become the official language.

In 1957 Ghana, (formerly known as the Gold Coast), became the first country in sub-Saharan Africa to gain independence. Ghana has been a stable democracy since 1992, which marked the drafting of a new constitution. Ghana is governed under a multi-party democratic system, with elected presidents allowed to hold power for a maximum of two terms of four years each.

Ghana predominantly has a tropical climate and consists mostly of low savannah regions with a central, hilled forest belt. Ghana's one dominant geographic feature is the Volta River, upon which the Akosombo Hydro-Electric Dam was built in 1964. The damming of the Volta created the enormous Lake Volta, which occupies a sizeable portion of Ghana's south-eastern territory.

Ghana has a market-based economy with relatively few policy barriers to trade and investment in comparison with other countries in the region. Ghana has substantial natural resources and a much higher per capita output than many other countries in West Africa.

Major international airlines fly into and from the international airport in Ghana's capital city, Accra.

4.1 Location and Area

The AGM tenements are in the Amansie West and South Districts, of the Ashanti Region of Ghana, approximately 250 km NW of the capital Accra and some 50 km to 80 km south west of the regional capital Kumasi (Figure 4-1 and Figure 4-2).

The AGM areas are accessed from the town of Obuasi, northward towards Kumasi on the Kumasi-Dunkwa highway to the Anwiankwanta junction.

The AGM is accessed by travelling 35 km south to Anwiankwanta Junction, and then west into the AGM property on surfaced and un-surfaced all weather roads.

The concessions cover an area of approximately 476 km2 between latitudes 6º 19'40" N and 6º 28' 40" N; and longitudes 2º 00' 55" W and 1º 55' 00" W.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 4-1 Location of the Asanko Gold Mine in the Ashanti Region of Ghana, West Africa
Source: CJM, 2014


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 4-2 Location of the AGM Tenements
Source: Asanko Gold Mine, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

4.2 Licences and Mineral Tenure

The following legal information was prepared by subject matter experts within Asanko Gold Ghana Limited under the supervision of the Company (see Section 3.1).

4.2.1 Mining Legislation Overview

The Minerals and Mining Act, 2006 (Act 703) (as amended by the Minerals and Mining (Amendment) Act, 2015 (Act 900) and the Minerals Commission Act, 1993 (Act 450) are the principal enactments setting out the framework of Ghanaian mining law. These acts express the basic position that minerals in their natural state are owned by the state; they also outline the licensing scheme for mineral operations, the incidents of the various mineral rights and the powers of the principal regulatory institutions. The following pieces of subordinate legislation add detail in specific areas to the regime set out in the principal legislation:

a) Minerals and Mining (General) Regulations, 2012

b) Minerals and Mining (Support Services) Regulations, 2012

c) Minerals and Mining (Compensation and Settlement) Regulations, 2012

d) Minerals and Mining (Licensing) Regulations, 2012

e) Minerals and Mining (Explosives) Regulations, 2012

f) Minerals and Mining (Health, Safety and Technical) Regulations, 2012

g) Minerals and Mining (Local Content and Local Participation) Regulations 2020 (LI 2431)

The mining law divides the various licences that can be granted for a mineral right into three sequential categories, Reconnaissance Licence, Prospecting Licence and a Mining Lease, defined under the Minerals and Mining Act, 2006 (Act 703). These licences are discussed below.

4.2.1.1 Reconnaissance Licence (Sections 31-33)

A reconnaissance licence entitles the holder to search for specified minerals by geochemical, geophysical and geological means. It does not generally permit drilling, excavation, or other physical activities on the land, except where such activity is specifically permitted by the licence. It is normally granted for 12 months and may be renewed for a period not exceeding 12 months if it is in the public interest. The area extent is negotiable, related to the proposed reconnaissance program.

4.2.1.2 Prospecting Licence (Sections 34-38)

A prospecting licence entitles the holder to search for the stipulated minerals and to determine their extent and economic value. This licence is granted initially for a period of up to three years covering a maximum area of 150 km2. This may be renewed for an additional period of two years, but with a 50% reduction in the size of the licence area if requested. A prospecting licence will only be granted if the applicant shows adequate financial resources, technical competence and experience and shows an adequate prospecting program. It enables the holder to carry out drilling, excavation and other physical activities on the ground.

4.2.1.3 Mining Lease (Sections 39-46)

When the holder of a prospecting licence establishes that the mineral to which the licence relates is present in commercial quantities, notice of this must be given to the Minister of Lands, Forestry and Mines and if the holder wishes to proceed towards mining, an application for a mining lease must be made to the Minister within three months of the date of the notice.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

4.2.2 Issuer's Title to the AGM Concessions

The AGM concessions are owned 100% by Asanko Gold Ghana Limited. The legal status of the mineral properties in Ghana in which Asanko Gold has an interest have been verified by Asanko Gold and by an independent legal entity, Kimathi Partners Corporate Attorneys based in Accra. As at December 31, 2021, all mineral tenements were in good standing with the Government of Ghana. Furthermore, it has been confirmed that the properties are lawfully accessible for evaluation and also mineral production.

AGGL holds 7 mining leases, 9 prospecting licences and 1 reconnaissance licence which collectively make up the AGM property and span over 40 km length of the Asankrangwa Belt. The AGM is made up of a series of contiguous concessions in the Obotan and Esaase area (Figure 4-2). These concessions cover a total area of 476 km2.

The areas of the respective mining leases and prospecting licences with respective company owners are tabulated in (Table 4-1).

Table 4-1 Asanko Gold Mine Mining Lease and Prospecting Concession Areas

Name

Mincom Ref#

Licence
area (km
2)

Type

Status/ Expiry date

Ownership

Abore

PL 6/352

28.47

Mining Lease

Valid-ML 4/2030

Asanko - 100 %

Abirem

PL 6/303

47.13

Mining Lease

Valid-ML 3/2026

Adubea

PL 6/310

13.38

Mining Lease

Valid-ML 4/2030

Miradani

PL 6/122

14.98

Mining Lease

Valid-ML 5/2025

Asanko - 100 %

Esaase

PL 6/8 Vol 8

27.03

Mining Lease

Application, All relevant documents and payment made for renewal of ML. Awaiting Ministerial Approval.

Jeni River

RL 6/21

27.37

Mining Lease

Application, All relevant documents and payment made for renewal of ML. Awaiting Ministerial Approval.

Kaniago

PL 6/307

25.5

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

Asanko - 100 %

New Obuase

PL 3/84

33.67

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

Datano

PL 6/32

53.78

Mining Lease

Valid-ML 5/2030

Mepom

Pl 6/245

2.37

Prospecting

Note 1

Asanko - 100 %

Dawohodo

PL 6/43

10.00

Prospecting

Valid-PL 12/2023

 

 

 

 

 

 

 

 

 

 

Asanko - 100 %

Sky Gold

RL 6/86

91.50

Reconnaissance

Application, All relevant documents and payment made for renewal of RL. Awaiting Ministerial Approval. Note 2

 

 

 

 

 

Kaniago

PL 6/289

25.27

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

 

 

Asanko - 100 %

Besease

PL.6/120

15.55

Prospecting

Valid-PL 12/2023

Mmooho

PL 6/352

5.70

Prospecting

Valid-PL 12/2023

Gyagyatreso

PL6/32

10.83

Prospecting

Application, All relevant documents and payment made for renewal of PL. Awaiting Ministerial Approval

 

 

Amoaman

PL6/380

43.47

Prospecting

Valid-PL 11/2022

Note 1: Mepom License renewal pending since 2012. In process of being merged with Esaase ML

Note 2: License conversion from RL to PL pending since 2012.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

In the case where an application is awaiting ministerial approval, the renewed application has been submitted and recognized by the Ghana Minerals Commission (Mincom) and is awaiting final Ministerial signature. Mining Leases are renewed for an extended period based on available reported resources whereas Prospecting Licenses are renewed for an additional three (3) years from date of Ministerial Grant. The final step which may reverse this accepted status is the lease ratification by Parliament thereby preventing the Ministerial approval. This is, however, typically a formality.

A prospecting renewal application (3 years) and a renewal for a Mining Lease is submitted to Mincom and is always accompanied by an updated technical report, relevant processing fees, consideration fees, annual mineral right fees and Stool Land fees. The renewal application is subsequently submitted by Mincom to the Ministry of Lands and Natural Resources for secondary approvals and is completed by Ministerial Approval thereafter.

The lease/concession boundaries have been surveyed by global positioning system (GPS) and are correlated with the latitude and longitude via degree co-ordinates as per the Ghanaian Mining Cadastre (July 2016).

AGGL is the merged entity of Keegan Resources Ghana Limited (KRGL) and Adansi Gold. When AGGL acquired the Esaase concessions, there was a mining lease in place from the historical alluvial mining operations. The Minister of Lands and Natural Resources granted the other Mining Leases for the Obotan Project to PMI Gold Inc (PMI) in November 2012, prior to the acquisition of PMI by AGGL in early 2014.

In November 2012, AGGL formally received mining leases on the Abore-Abirem and Adubea prospecting licences.

The formal grant of these three Mining Leases, renewable under the terms of the Minerals and Mining Act, 2006 (Act 703), followed the favourable recommendation by the Minerals Commission of Ghana in September 2012. The Mining Leases cover a total area of 167 km2, encompassing the two main deposits, Nkran and Esaase and the smaller satellite deposits, Abore, Adubiaso, Dynamite Hill, Akwasiso, Asuadai, Adubiaso Extension and Nkran Extension.

In 2017, AGGL acquired the Miradani Mining Lease area situated in the southern camp adjacent to the Datano concession area.

4.3 Agreements, Royalties and Encumbrances

All concessions carry a 10% free carried interest in favour of the Ghanaian government and as a result, the Ghanaian government holds a 10% interest in Asanko Gold Ghana. The mining leases are also subject to a 5% Net Smelter Return royalty payable to the Government of Ghana. In addition, the Adubea mining concession is subject to an additional 0.5% NSR royalty to the original concession owner. The Esaase mining lease is also subject to an additional 0.5% NSR royalty to the Bonte Liquidation Committee. The Akwasiso pit on the Abirem mining lease is also subject to an additional 2% NSR royalty payable to the original concession owner.

4.4 Environmental Obligations

Environmental liabilities are discussed in Section 20.

4.5 Permits

Permits are discussed in Section 20.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

4.6 Fraser Institute Survey

The QPs have used the Policy Perception Index from the 2020 Fraser Institute Annual Survey of Mining Companies report (the Fraser Institute Survey) as a credible source for the international mining industry consensus on the overall political risk facing an exploration or mining project in Ghana. The QP has relied on the Fraser Institute survey because it is globally regarded as an independent report-card style assessment to governments on how attractive their policies are from the point of view of an exploration manager of a mining company. The survey forms a proxy for the assessment by senior management in the mining industry of political risk in Ghana. Overall, Ghana ranked as Africa's fourth most attractive country to the mining industry in 2020 and was 46th globally (out of the 77 jurisdictions in the 2020 Policy Perception survey).

The AGM is a developed mine in an established mining camp with the Ghanaian government as a free carried joint venture partner. The QPs are not aware of any significant factors and risks that may affect access, title, or the right or ability to perform the work on the property, other than what is described in this Report.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

5 ACCESIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY

5.1 Topography, Elevation and Vegetation

The AGM lies in the Amansie West District of the western region of Ghana. The AGM is located in hilly terrain dissected by broad, flat drainages that typically form swamps in the wet season between May and late October (Figure 5-1). Hill tops are generally at very similar elevations, reflecting the elevation of a previous erosional peneplane that is now extensively eroded. Maximum elevations are approximately 80 m above sea level (masl), but the areas impacted by the Project generally lie at less than 50 m elevation. Despite the subdued topography, hill slopes are typically steep. The concession areas are covered by a series of low, gently undulating hills, which rarely exceed 680 masl in elevation. Ecologically the AGM is situated in the wet evergreen forest zone.

In general, the concession areas have been largely transformed, having experienced extensive degradation in recent years. The main land uses include secondary forest, subsistence and cash crop farming, and artisanal gold mining.

Figure 5-1 Example of Topography and Vegetation Around Esaase Pit Location

The soils of the area fall within the Bekwai and Nzema Oda classification. The soils of the Bekwai series are found on the summits and some upper slope sites of the hills of the area. They are generally deep to very deep (over 20 cm), humus, well drained, red in colour, loam to clay loam, gravelly and concretionary, with well-developed sub angular blocky structure and clay cutans within sub-soils. The soils are acidic throughout the profile.

The soils of the Nzema Oda series are heavy textured soils developed on alluvial deposits along streams of the area. The soils are poorly drained and are subjected to flooding during the wet seasons and are greyish in colour with prominent yellowish orange mottles. The soils are deep, acidic with clay loam to clay textures, but are structureless in the sub-soils.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

5.2 Access

The Asanko Gold Mine is accessed by road from the city of Kumasi, south towards Obuasi on the Kumasi-Dunkwa highway to the Anwiankwanta junction then approximately 20 km west from this junction through Poano and Antoakurom on a tarred road onto a laterite road for approximately 30 km through Manso Akropon, Manso Atwere, Manso Nkwanta, Suntreso, Gyadukurom to Abore. At Abore, the road branches northwest to Akuntam, then northeast to Nkasu. At Gyadukurum, the road branches off south to Asuadai, Dynamite Hill, and Adubea. At Adubea, the road continues south to Kumpese and westward to Abirem, to Besease, then north to Mmooho. At Kumpese, the road branches south to Akwasiso, southwest to Koninase and to Nkran and Adubiaso. Areas of interest within the concession are reached via a combination of secondary roads, four-wheel drive tracks, logging roads, and farming/ hunting footpaths.

The Esaase property is accessed by road from the city of Kumasi by taking the tarred Sunyani-Kumasi road west for 10 km to the Bibiani Junction at Abuakwa and then southwest for 10 km along the tarred Bibiani-Kumasi highway to the village of Wiaso. A secondary tarred road is taken 8 km south from Wiaso to the village of Amankyea. Secondary gravel roads can be taken for a further 11 km via the villages of Ahewerwa and Tetrem.

The Esaase deposit itself is accessed by a 28 km haul road constructed by Asanko Gold.

5.3 Proximity to Population Centre and Transport

There are several local villages near the AGM site. The closest to the plant site is the Manso Nkran village, while the villages of Tetrem and Esaase are in close proximity to the Esaase deposit. Current site infrastructure and transport means are discussed in Section 5.5.

5.4 Climate and Length of Operating Season

The following is noted:

5.5 Infrastructure

Current site infrastructure with respect to the Obotan concessions consists of an office complex, metallurgical facility, tailings storage facility, senior and junior accommodation and mess facilities, workshops, power distribution facility, a core storage facility, potable and operational water supplies, a waste rock dump facility, an upgraded dry weather air strip and a haul road from Esaase pit to Nkran pit. In addition, the following is noted for the Obotan concessions:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The following resources are available for the Esaase concession area:

Ghana has a mature mining industry that has resulted in the local availability of both skilled and unskilled personnel.

5.6 Surface Rights

The laws regarding surface rights is captured in the Mineral and Mining Act 206, Act 703 sub-section 72. This section gives rights to the owners of the land (i.e. Chiefs, family, individuals, etc.) to be compensated by Mineral Rights holders (i.e. mining companies).

Sub-section: 72

(1) The holder of a mineral right shall exercise the rights under this Act subject to limitations that relate to surface rights that apply under an enactment and further limitations reasonably determined by the Minister.

(2) In the case of a dispute between a holder of a mining lease and the Minister concerning the limitations determined by the Minister under this subsection, the dispute shall be referred for resolution under section 27.

(3) The lawful occupier of land within an area subject to a mineral right shall retain the right to graze livestock upon or to cultivate the surface of the land if the grazing or cultivation does not interfere with the mineral operations in the area.

(4) In the case of a mining area, the owner or lawful occupier of the land within the mining area shall not erect a building or a structure without the consent of the holder of the mining lease, or if the consent is unreasonably withheld, without the consent of the Minister.

(5) The owner of a mining lease shall, in the presence of the owner or lawful occupier or accredited representative of the owner or lawful occupier of land, the subject of a mining lease and in the presence of an officer of the Government agency responsible for land valuation carry out a survey of the crops and produce a crop identification map for the compensation in the event that mining activities are extended to the areas.

(6) An owner or lawful occupier of land shall not upgrade to a higher value crop without the written consent of the holder of the mining lease, or if the consent is unreasonably withheld, without the consent of the Minister.

In the case of AGM, all concessions belong to the Ashanti Kingdom who has in turn given same right to the relevant Divisional Chiefs and in some cases specific individuals to exercise that right in terms of compensation. Compensation with regards to surface right comes in the form of:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

There are sufficient surface rights available now, or that can be obtained, if necessary, for any future mining operations. There are adequate sources of power, water, mining personnel, tailings storage areas, waste rock disposal areas, and sites for processing facilities.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

6 HISTORY

6.1 Prior Ownership and Ownership Changes

The deposits within the current AGM property have largely undergone a number of ownership changes since their discovery.

In 2007 Keegan Resources Inc acquired 100% of the Esaase Mining Lease from Sametro Company Limited, a private Ghana company. This lease includes the Esaase mineral deposit. In 2013 Keegan Resources Inc change the name of the company to Asanko Gold Inc. In 2014, Asanko Gold Inc acquired the Abirem, Adubea, and Abore Mining Leases from PMI Gold Inc. These leases include the Nkran, Akwasiso, Asuadai, Adubiaso, Abore and Dynamite Hill mineral deposits. In 2017 Asanko Gold Inc. acquired the Miradani Mining Lease which includes the Miradani mineral deposit. In 2020 Asanko Gold Inc changed the name of the company to Galiano Gold Inc. All these properties, collectively known as the Asanko Gold Mine, form the basis of a joint venture established between Galiano Gold and Gold Fields Limited in 2018. Galiano Gold Inc is the JV operator.

A summary of this is provided in Table 6-1.

Table 6-1 Summary History of Ownership

Year

Ownership

Nkran (Historically Nkran Hill, or Obotan Mine)

Late 1980s

Obotan Minerals awarded prospecting concession over 106 km² (current Abirem Mining Lease, Adubea Mining Lease and Abore Mining Lease).

1990

Kiwi Resources Limited (KIR) took over Obotan Minerals interest. Concession explored by Australian juniors Associated Gold Fields NL (AGF) and KIR.

1996

Resolute Mining Limited (Resolute) bought combined interests of AGF and KIR (Nkran, Akwasiso, Asuadai, Adubiaso and Abore).

1999

Resolute changed name to Resolute Amansie Limited.

2001

Obotan Mine closed.

2006

Resolute relinquished ground to Government of Ghana who granted several small-scale mining leases on the deposits. PMI Gold Inc (PMI) acquired the Abirem, Abore and Adubea prospecting licenses.

2014

Asanko Gold acquired mining leases Abirem, Adubea and Abore from PMI through purchase agreement. Obotan Mine renamed to Nkran Mine.

Esaase

1900-1939

Artisanal mining.

1990

Adjacent Jeni River mining lease granted to Jeni River Development Company Limited.

1990

Esaase (previously Bonte) mining lease granted to Akrokerri-Ashanti Gold Mines (AAGM) and later transferred to local subsidiary Bonte Gold Mines Limited (BGM).

2002

Ghanaian incorporated private company Dawohodo Manufacturing and Marketing Limited granted adjacent prospecting license to the south (Dawohodo-Esaase prospecting license).

2003

Jeni River Development Company Limited and BGM declared bankrupt. Esaase mining lease acquired from the Bonte Liquidation Committee by private Ghanaian company Sametro Company Limited (Sametro).

2006

Keegan Resources Inc (Keegan) entered into an option agreement with Sametro to earn 100% of the Esaase mining lease.

2007

Esaase mining lease transferred to Keegan.

2013

Keegan changed name to Asanko Gold.

Akwasiso see Nkran - Abirem lease area

Abore

Pre-1990

Small scale mining license held by Oda River Gold.

1990

Mutual Resources acquired Oda River Gold and formed JV with Leo Shield Exploration.

1990

Leo Shield Exploration (which became Shield Resources) bought out Mutual Resources.

2001

Agreement entered with Resolute; and Resolute took ownership of project.

2006

Resolute relinquished lease to Government of Ghana. PMI acquired Abore license.



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Year

Ownership

2015

Asanko Gold acquired ground from PMI.

Asuadai - Adubea lease area

1996

Resolute purchased combined interests of AGF and KIR. Released to six small scale operators at the time of mine closure.

2006

Resolute relinquished ground to Government of Ghana. Adubea license granted to Chief Joseph Biney family, and later acquired by PMI.

2015

Asanko Gold acquired ground from PMI.

Adubiaso see Nkran - Abirem lease area

Miradani North - Miradani lease area

1994

Miradani Mining Lease granted to Ashanti Goldfields, now Anglogold Ashanti (AGA)

2017

Asanko acquired the Miradani Lease from AGA

Dynamite Hill - Adubea lease area

2013

Discovered by PMI beneath laterite cap

2017

Commencement of mining delayed until Q4 2017 due to regulatory approvals

2019

Production ceased in Q4 2019

In March 2020, Asanko Gold Inc. changed its name to Galiano Gold Inc.

6.2 Historical Exploration and Development

Gold rushes in the area occurred in 1898 to 1901 and again in the 1930s. Most of the Asanko Gold concessions, however, have no record of the work undertaken on the properties for this period. Interest in the area was renewed in the early 1990s mainly because of the successful exploration work carried out on the adjacent concession where the Nkran deposit is located.

Table 6-2 below summarizes the extent of the exploration activities and developments per area relevant to the current Mineral Resource.

Table 6-2 Summary of Historical Exploration and Development per Deposit

Period

Workings

Operator

Nkran

 

Historical

Alluvial and eluvial gold artisanal gold mining which extend for ±610 m in a northeast-southwest direction. European settlers worked the deposits - adits and drives extend 80 m into the hill on site of old native workings.

 

1980s

Limited exploration work undertaken with minor attention paid to the alluvial gold potential.

Previous Owner

1990-1995

Exploration focused on known prospects at Nkran deposit (formerly known as Jabokassie).

Regional soil geochemical survey carried out that identified numerous anomalies around Nkran.

Early reverse circulation drilling phase (details not available) yielded encouraging results over wide zone of bedrock mineralization, extending along strike for 600 m. The broad, low-lying Nkran had relief of only about 40 m with oxidation extending to depths of 40 m.

Previous Owner

1995

Additional DDH, RC, RC and RCD drilling was completed. Mineral Resources (Measured, Indicated and Inferred classes) were estimated and reported. A feasibility study was completed, and mining lease was granted.

Previous Owner 

1996

Combined interests of KIR and AGF bought out by Resolute who immediately reviewed and expanded project scope. Further RC and DDH drilling conducted to increase Mineral Resources to a depth of 150 m at Nkran and to further assess the known mineralization at nearby Adubiaso.

Previous Owner

July 1996

Revised mine development plan completed with decision to proceed into production at a rate of 1.4 Mtpa.

Previous Owner

Early 1997

Initial mining commenced, and further exploration drilling continued.

Previous Owner



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Period

Workings

Operator

May 1997

First gold poured.

Previous Owner

1998-2000

Additional DDH, RC, RCD holes drilled.

Previous Owner

2001

Nkran Mine closed due to low gold price having produced 590,743 oz Au at an average grade of 2.35 g/t Au.

Previous Owner

2002

Intensive exploration undertaken.

Previous Owner

2011

PMI carried out a 5 km² Induced Potential (IP) ground geophysical survey. PMI also completed a VTEM electromagnetic (EM) and magnetic survey centred over the Nkran pit.

Previous Owner

2015-2016

Nkran Mine dewatered and re-opened by Asanko Gold as a deeper opencast operation.

Galiano

2016-2020

Open pit production. Plant refurbishment and expansion to circa 5 Mtpa

Galiano

2020

Additional drilling (DDH, RC and RCD) completed to infill and expand on resource at depth. Refer to Table 10-1 for total quantities.

Galiano

Esaase

 

Historical

Artisanal mining in Bonte Area associated with the Ashanti Kingdom.

 

1900-1939

Workings by European settlers evidenced by old adits - no documented records remain.

Previous Owner

1966-1967

Drilling conducted on the Bonte River valley alluvial sediments to determine alluvial gold potential - no information available.

Previous Owner

1990

Bonte mining lease granted to Akrokerri-Ashanti Gold Mines (AAGM) and later transferred to BGM.

Previous Owner

1990-2002

Recovered approximately 200,000 oz of alluvial gold on Esaase concession +300,000 oz downstream on Jeni River concession.

Previous Owner

2006-2013

Keegan consolidates further concessions. Intensive exploration - geophysics (airborne VTEM - 2,266 line-km), soil geochemistry (>4,000 samples) and exploration drilling. Drilling included DDH, DTH, RC, and RCD. Refer to Table 10-1 for total quantities.

Galiano

2013-2018

Asanko Gold continued extensive exploration drilling in order to update the Mineral Resources. Refer to Table 10-1 for total quantities.

Galiano

Dec 2018-current

Open pit production.

Galiano

2020-2021

Infill drilling conducted. Refer to Table 10-1 for total quantities.

Galiano

Nkran Extension Project Area

 

Historical

No known historical exploration or mining activity.

 

1997-current

Exploration on north-eastern extension of Nkran structure delineated a number of mineralized zones - Akwasiso and Nkran Extension that have all been drilled (2016) to Indicated Mineral Resource classification.

Previous Owner/Galiano

Akwasiso

 

1996-2000

Exploration programs including RC and DDH holes. Refer to Table 10-1 for total quantities.

Previous Owner

2001

Artisanal miners mined oxides. DDH holes drilled. Refer to Table 10-1 for total quantities.

Previous Owner

2014-2018

Exploration continues with purpose of refining the Mineral Resource. Drilling undertaken including RC, DDH, and RCD holes. Refer to Table 10-1 for total quantities.

Galiano

2017

Open pit operations commence.

Galiano

Dec 2018

Open pit operations suspended in Q1 2019.

Galiano

2019

Exploration drilling including RC, DD and RCD holes. Refer to Table 10-1 for total quantities.

Galiano

Jan 2020

Mining resumed

Galiano

Abore

 

Historical

Alluvial and eluvial artisanal gold mining.

 

1990-1998

Mutual Resources and Leo Shield Exploration initiated regional exploration program (73 km²) including soil geochemistry and trenching. Soil geochemistry revealed a strong north-north-east trending gold anomaly over the area of artisanal mining (bedrock areas); the anomaly is several hundred metres wide and traceable along strike for about 3 km, well beyond the area of old workings. Extensive trenching confirmed continuous bedrock mineralization over 1,000 m with widths in the range 50 m to 100 m. The mineralization consists of a broad quartz stock work system hosted mainly by a north-north-east trending intermediate granitoid intrusion. Early artisanal pitting was focused mainly on narrow quartz veins associated with the stock work system

Extensive drilling in the area (mainly RC, some DDH) outlined sizeable resources (now known as the Abore, Adubiaso, Asuadai and Akwasiso prospects). Full details of this work are not available. Prospecting in area north of Abore revealed artisanal mining in alluvial areas, as well as many old pits in the saprolite along a low hill immediately adjacent to the alluvial workings.

Previous Owner



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Period

Workings

Operator

2007-2012

Exploration programs which included RC and DDH drilling completed. Resulted in a Mineral resource estimate. Open pit mining, and an agreement was reached whereby ore was trucked from Abore north to Nkran plant for treatment. Refer to Table 10-1 for total drilling quantities.

Previous Owner

2012-current

No further exploration undertaken. Mineral Resource estimate restated.

Galiano

2019 - 2021

RC and RCD drilling, to extend the known resource at depth and along strike to the north. Refer to Table 10-1 for total quantities.

Galiano

Asuadai

 

Historical

No known formal historical mining or exploration on this area. Minor pitting in the region by artisanal miners down to 5 m to 10 m through the oxide material to expose stock work vein sets.

 

1996

Mining undertaken by artisanal workers (to present day).

Previous Owner

2000-2012

Exploration programs which included RC and DDH drilling completed. Refer to Table 10-1 for total quantities.

Previous Owner

2014 - current

No further exploration undertaken. Mineral Resource estimate restated.

Galiano

Adubiaso

 

Historical

No known formal historical mining or exploration on this area.

 

1996-2000

DD, RCD, and RC drilling completed. Refer to Table 10-1 for total quantities.

Previous Owner

1999-2000

Open pit mining. Oxide ore processed at Nkran plant.

Previous Owner

2007-2013

Exploration programs including RC and DDH drilling completed. Refer to Table 10-1 for total quantities.

Previous Owner

2016

Exploration continues with RC drilling to refine ore body definition. Refer to Table 10-1 for total quantities.

Galiano

2017 - current

No further exploration undertaken. Mineral Resource estimate restated.

Galiano

2020

RC and RCD drilling complete. Refer to Table 10-1 for total quantities.

Galiano

Miradani North

 

1900-1914

Ashanti Rivers and Concession Ltd conducted 'extensive exploration' including adits

Previous Owner

1995

Miradani Mining License acquired by Ashanti Goldfields, now Anglogold Ashanti (AGA)

Previous Owner

1995-1996

Airborne geophysics, soil sampling and trenching completed by AGA

Previous Owner

2017

License acquired from AGA

Galiano

2017 - 2021

RC, DD, and RCD drilling complete. Refer to Table 10-1 for total quantities.

Galiano

Dynamite Hill

 

2013

Discovered through trenching and drilling in 2013

Galiano

2013-2016

DD, RC, and RCD drilling complete. Refer to Table 10-1 for total quantities.

Galiano

2021

Additional drilling to extend resource at depth, including RC and RCD drilling. Refer to Table 10-1 for total quantities.

Galiano



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

6.3 Previous Mineral Resource Estimates

A number of Mineral Resource and Mineral Reserve estimations and declarations have been conducted over the various project areas that are the subject of this Report since 1995. The current Mineral Resources are not based on the previous estimates and have been re-estimated from first principles.

6.4 Historical Production

Artisanal mining has occurred at a number of the Asanko Gold target areas, focusing mainly on placer gold production. Prior to the Asanko Gold consolidation of the Keegan and PMI mineral assets in 2014, a number of satellite pit mining and evaluation projects were in operation.

The main producing mine in the area was the Obotan Mine (now Nkran Mine). Open pit mining commenced in February 1997. A total of 16.11 Mm3 of material was excavated from the open pit at a production rate of 1.4 Mtpa. Following several re-designs, the pit was mined in two stages. A total of 7.82 Mt of material was milled at an average recovery of 89% at a reported reserve grade of 2.35 g/t (Brinkley 2001). The mine was closed in July 2001 after having produced 590,743 oz Au. Operations ceased due to a low gold price environment coupled with the requirement to push back the Nkran pit to access deeper reserves. Asanko Gold dewatered the Nkran pit and re-commenced mining operations in February 2015, with the first gold produced in February 2016. Production was reported at Nkran through to Q2 2020, producing a total of 797,949 oz of gold.

At Esaase, under the Bonte mining lease BGM recovered approximately 200,000 oz of alluvial gold during the period 1990-2002. No mining or production details are available. Asanko Gold commenced operations at Esaase in 2018 extracting from non-alluvial sources. Production to date totals 452,477 oz of gold.

At Abore, Resolute Mining Limited (Resolute) conducted mining in the late 1990s to early 2000s. Mining targeted mainly oxides and transition material by open cast blast, load and haul to be processed at the old Nkran plant. Production details are unknown.

At Adubiaso, Resolute mined mostly oxides and transition material from the deposit by open cast free dig, load and haul to the Nkran plant. Mining was from October 1999 to December 2000. As reported by Brinkley (2001), a total of 3.79 Mm3 of material was excavated from Adubiaso open pit. A total of 0.70 Mt at 2.43 g/t Au was delivered to the ROM pad, containing a total of 54,654 oz of gold. Total production of 52,677 oz (recovered) was achieved with a pre-production cost of US$90/oz (February 1999 to October 1999); and an operating cost of US$262/oz (October 1999 to December 2000).

The Asuadai deposit has seen no legal mining conducted since the mineralization was identified. Artisanal miners had and still are undertaking pitting within the mineralized zones of the prospect.

The Dynamite Hill deposit was discovered in 2013 and put into production in Q4 2017. Production ceased in late 2019 having yielded 91,149 oz of gold.

No large-scale mining was conducted at Akwasiso prior to Asanko Gold. Akwasiso has been in operation since 2018. Production to date totals 152,328 oz of gold.

At Miradani North, some open pit mining was conducted to a vertical depth of 30-40m by GPS Ghana Ltd. The current pit is approximately 120 m long and 75 m. Production details from this operation are unknown at this time.

There is no record of formal commercial historical mining activity for the other target areas.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

7 GEOLOGICAL SETTING AND MINERALIZATION

Unless specified otherwise, all diagrams in this section are sourced from Asanko Gold Mine, 2019.

7.1 Regional Geology

The geology of Ghana is largely underlain by the West African craton. The craton consists of the Man-Leo (or Kénéma-Man) shield in the south (extending from Ghana to Senegal) and the Archaean Reguibat Shield in Mauritania to the north. They are separated by overlying younger sedimentary rocks of the Taoudeni Basin (see Figure 7-1).

Figure 7-1 Simplified Map of the West African Craton, with Associated Gold Deposits (Modified from Goldfarb et al, 2017)

Note: Numbers 1 to 9 outline the different Archean, Proterozoic, and Hercynian domains: 1 = Eglab, 2 = Yetti, 3 = Daomeyan, 4 = Baoulé-Mossi, 5 = Kenema-Man, 6 = Kédougou-Kénébia Inlier, 7 =Rokelides, 8 = Bassarides, 9 = Mauritanides             


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The Man-Leo Shield covers the southernmost third of the craton. It is divided into two portions, with the Archaean age Kenema-Man Domain in the west and a Paleoproterozoic dominated Birimian aged terrain in the east, sometimes referred to as the Baoulé-Mossi domain. The Birimian rocks consist of five evenly spaced commonly NNE-trending, narrow, linear greenstone belts composed of calc-alkaline or tholeiitic volcanic rocks (Figure 7-2 and Figure 7-3). These belts are separated by wide intervening basins (such as the Kumasi Basin) filled with thick turbiditic sequences of argillites, phyllites, graywackes, and chemical sediments. The Birimian rocks are believed to have formed during two major orogenic phases, namely the Eoeburnian (ca. 2.25 to 2.15 Ga) and the Eburnian (ca. 2.12 to 2.06 Ga).

Birimian sedimentation was followed by deposition of clastic sediments of the Tarkwa Group from ca. 2135 to 2120 Ma, in places interbedded with the Birimian units and containing clasts derived from the Birimian rocks. Generally, though, the contact is considered unconformable. Tarkwaian conglomerates, sandstones, and phyllites appear to have accumulated in restricted basins within the volcanic belts of the Birimian towards the end of the volcanic cycle.

Three magmatic episodes intrude the Birimian rocks, divided based on petrography, geochemistry, and isotopic ages (Baratoux et al., 2011), as well as magnetic and radiometric signatures (Metelka et al., 2011).

Later deformation resulted in widespread lower to upper greenschist facies metamorphism of most of the volcanic and sedimentary rocks in the greenstone belts (Feybesse et al., 2006), although amphibolite facies peak conditions were locally reached during regional metamorphism.

Clastic shallow water sediments of the Neoproterozoic Volta Basin cover the northeast of the country. Minor Paleozoic and Cretaceous to Tertiary sediments occur along the coast and in the extreme southeast of the country.

Much of this deformation is what is termed the Eburnean orogeny, which Allibone et al. (2004) defined as represented by two major deformational cycles. Feybesse et al. (2006) synthesized these West African events as 2130 to 2105 Ma (D1) thrusting followed by 2095 to 1980 Ma (D2-D3) transcurrent tectonics.

The margins of the belts commonly exhibit faulting on local and regional scales. These structures are fundamentally important in the development of gold deposits for which the region is well known.

Multiple tectonic events have affected virtually all Birimian rocks with the most substantive being the Eburnean Orogeny fold-thrust compressional event, that affected both volcanic and sedimentary belts throughout the region and to a lesser extent, Tarkwaian rocks. For this reason, relative age relations suggest that the final deposition of Tarkwaian rocks took place as the underlying and adjacent volcanic and sedimentary rocks were undergoing the initial stages of compressional deformation.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-2 Regional Geology of Southwest Ghana Around AGM Concessions
Source: Ghana Geological Survey; CJM, 2014


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-3 Generalized Stratigraphy of Southwest Ghana
Source: CJM, 2014

Mesothermal gold mineralization in the Birimian Supergroup occurs as two main types, namely quartz vein hosted and disseminated sulphide type (Leube et al., 1990; Béziat et al., 2008), and most developed between 2.2 and 1.8 Ga. Of these, orogenic gold deposits formed between 2.2 and 2.0 Ga, intrusion-related (and skarn) between 2.2 and 2.1 Ga, and paleoplacer types between 2.06 and 1.8 Ga.

There are also examples of atypical major supergene gold deposits such as Yatela, which has been correlated with the glacial formation on the West African craton during the Miocene-Eocene epochs (Matsheka and Hein., 2011). Furthermore, gold mineralization is also known from the Archean of Sierra Leone and Liberia dating to 2.9 Ga (Foster and Piper, 1993). The youngest in situ recognized gold phase occurs in the Pan-African Dahomeyan belt of Togo (Markwitz et al., 2015).

Orogenic gold in West Africa is hosted in a range of rock types including mafic-hosted (both intrusive and extrusive units), granitoid-hosted, sediment-hosted, carbonate-hosted, and Banded Iron Formation (BIF) hosted. Orogenic gold in shear zones, commonly in quartz veins, is the dominant style of mineralization in West Africa (Markwitz et al 2015).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Intrusion-related deposits and skarn deposits are rarer and, with some exceptions, are also controversial concerning an agreed genetic model. Generally, gold mineralization is associated with greenschist metamorphosed terrains, and less commonly in lower amphibolite facies rocks. Most deposits are found in the Baoulé Mossi domain and the Kédougou-Kéniéba Inlier and are spatial associated with shear zones. The shear zones commonly occur at the contact between Birimian metasedimentary and metavolcanic rocks (Kesse, 1985), with gold deposits expressing a significant degree of structural control (Béziat et al., 2008). Some gold mineralization is related to the pre-Eburnean metallogenesis (Tangaean event) at approximately 2.19-2.15 Ga (Allibone et al., 2002; Tshibubudze et al., 2009; Hein, 2010; de Kock et al., 2012) which is observed in Ghana (e.g.,Wassa), Burkina Faso (e.g., Kiaka, Essakane) and Mali (e.g., Morila).

In the West African Craton, the peak of mineralization was during the Eburnean Orogeny at approximately 2.15-2.10 Ga and produced very large (>10 Moz) gold deposits associated with regional northeast-southwest trending shear zones. Gold occurs as free grains associated with quartz and/or is hosted in sulphides (mainly pyrite and arsenopyrite) (Milési et al.,1989).

Extensive hydrothermal alteration is observed throughout gold-rich areas, with carbonate-pyrite-chlorite-sericite alteration in meta-sedimentary rocks, actinolite-chlorite-quartz ± chalcopyrite ± albite ± leucoxene in mafic volcanic rocks, and quartz-chlorite-sericite-epidote in felsic intrusive rocks (Markwitz et al., 2015).

7.2 Local Geology

The AGM deposits are located within the Kumasi Basin, one of the intervening basins between the greenstone belts. Within this basin lies the Asankrangwa Gold Belt which was recognized after decades of artisanal mining in gold-bearing, shear zone hosted quartz reefs. The basin is bound to the southeast by the Ashanti Fault/Shear and the Bibiani shear to the northwest. The Asankrangwa Belt expresses itself as a complex of northeast-trending shear zones situated along the central axis of the Kumasi Basin. Several major northeast-trending shears/structures bisect the Kumasi Basin/Asankrangwa Belt. The Nkran deposit is located on a jog along the regional 35-40° trending Nkran Shear, which is a zone of about 15 km in width and may be traced on a northeast to southwest trend for a distance of some 150 km. The Nkran Shear Corridor also hosts the Asuadai, Dynamite Hill, and Akwasiso deposits. The parallel Esaase Shear Corridor hosts the Esaase, Adubiaso, and Abore deposits. The Miradani Shear Corridor hosts the Tontokrom, Miradani, and Fromenda deposits.

The Kumasi Basin is heavily faulted and consists of an isoclinally folded sequence of metasediments, dominated by turbiditic sequences of greywackes and shales, intercalated with rare andesitic and volcaniclastic rocks, previously described as greywackes, phyllites, argillites, and shales.

The Asankrangwa Belt straddles two broad domains of distinct magnetic character. The western portion is characterized by the low magnetic relief that is typical of the Kumasi Basin as a whole. In the east, moderately magnetic mafic volcanic rocks result in a high magnetic zone corresponding to the Lower Birimian Supergroup, and the infolded, strongly magnetic rocks of the Ashanti Belt volcano-sedimentary and Tarkwaian sedimentary packages. This domain is in sharp contact with the weakly, to non-magnetic rocks of the upper Birimian metasediments, which dominate the Kumasi Basin in the west. This zone of contrast coincides with the prominent, shear zone which bounds the northwest margin of the Ashanti volcanic belt that plays host to most of the large gold deposits in the area.

A sharp NE trending break separates these two distinct magnetic domains and also truncates the dominant ENE to WSW trends typical of the eastern domain. Evident, dramatic changes in the structural grain in the area indicate the presence of a major shear zone separating the two domains. This interpretation results in the Upper Birimian metasediments of the western domain occurring in the hanging wall of the shear zone, and above Lower Birimian metavolcanics of the eastern domain which occur in the shear zone footwall. This arrangement of 'younger-over-older' supports a long and intense thrusting history on the shear zone.

One of the structural setting interpretations of the Asankrangwa Belt that explains these relationships is an inverted half-graben, in which growth faulting-controlled accumulation of the upper Birimian metasediments, above the Lower Birimian metavolcanics in the footwall.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

7.3 Regolith and Weathering Profile

The regolith system of the Asankrangwa belt is a typical tropical weathering environment. The topography comprises rolling hills and valleys with a dendritic drainage pattern that features a network of rivers and streams that generally drain southwards.

In this vast area, different regolith regimes are observed namely relic, erosional and depositional. The relict regime contains mainly lateritic residuum, the erosional regime comprises ferruginous saprolite, saprolite, lag, and soil on saprolite bedrock saprolite and soils on bedrock saprolite. The depositional regimes are mainly colluvium, alluvium, paleochannel, and lacustrine sediments, and ferricrete.

On hilltops, ridges, and elevated topographies and slopes, there is vegetation cover sitting on topsoil rich in organic matter which is between 0-30 cm thick. Underneath this is the lateritic residuum comprising lateritic gravel and duricrust beneath which is the mottled zone followed by plasmic zones. Beneath the plasmic zone lies the saprolite and the sap rock sitting on the bedrock.

In valleys and plains, the vegetation cover is underlain by mud, thick sandy soils, and pebbly gravels, 0.5 to 5 m thick, which overlie the saprolite, and the caprock. Both are underlain by bedrock.

Generally, the base of oxidation is about 50 m but varies between 20 to 80 m deep depending on local conditions such as rock type, topography degree of silicification, and other factors. The transition from completely weathered to fresh rock is 3 to 10 m thick but more gradual in the metasedimentary rocks compared to the intrusive rocks.

Figure 7-4 is a photo showing a typical regolith profile exposed in a road cut. Figure 7-5 shows the Asankrangwa belt regional geology.

Figure 7-4 Road-cut Exposure Showing Regolith Typical Regolith on a Hill on the Asankrangwa Belt


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-5 Location of AGM Deposits Along the Asankrangwa Gold Belt
Source: Asanko Gold Mine, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

7.4 Property Geology and Mineralization

The AGM deposits are hosted along the NE-SW Asankrangwa structural shear corridor, which is defined by NE-SW trending lineaments and magnetic lows and is about 7 km wide and over 50 km long. A summary of the structural controls on mineralization and dominant host rocks at each deposit is presented in Table 7-1.

Table 7-1 Summary of Structural Controls on Mineralization per Deposit

Deposit

Mineralization Control

Main Host Rock

Nkran

D2 shear + granitoid + linking QVs

Quartz (Qtz) sandstone + granitoid + quartz veins (QVs)

Nkran Extension

D2 shear + Late conjugate QVs

Qtz sandstone

Esaase

D2 shear + tensional QVs

Highly deformed sandstone-siltstone-shale + QVs

Akwasiso

D2 shear + granite + Late conjugate QVs

Qtz sandstone + granite + QVs

Abore

D2 shear + granite dyke + Late conjugate QVs

Granite + QVs

Asuadai

D2 + Granite + late conjugate QVs

Granite + QVs

Adubiaso

D2 shear + granite dyke + Late conjugate QVs

Qtz sandstone + granite

Adubiaso Ext

D2 shear + late conjugate QVs

Qtz sandstone

Miradani North

D2 shear + sub-horizontal linking QVs

Qtz sandstone + tonalite + QVs

7.4.1 Nkran

Nkran occurs on a 20° trending jog on the Nkran Shear Corridor. The Nkran Shear is characterized by sheared siltstones (phyllites) dominant on the western side of the shear and sandstone dominant on the east. The central part of the Nkran deposit consists of a series of wacke and sandstone-dominated stratigraphy that has been intruded by several felsic porphyry intrusions (see Davis, 2016). Consistent mappable lithologies are the western sandstone, the central sandstone, the eastern sandstone, the felsic granitic porphyry intrusive unit, and the skinny breccia unit which is located within the eastern sandstones and runs along the strike of the deposit.

In plan, the Nkran pit extends for approximately 850 m in a NE-SW direction along the strike length of the ore body, and at its widest point measures 450 m across strike. The main rock types at Nkran pit consist of thinly bedded greywacke and thickly bedded to massive sandstone, phyllite, and carbonaceous shale. The metasediments have been isoclinally folded and sheared, and generally dip steeply to the north-west at between 70º to 80º, with a steep 70º north-easterly plunge.

Intruding the metasediments are two lensoid tonalitic intrusions. The intrusion is largely restricted to the NE portion of the pit, with isolated pods of granitoid in the southern portion. Granitoid (as tonalite; Nude, 2011) is present at depth in the south end of the pit. The re-opening of the Nkran deposit has provided extensive in-pit exposure. The granitoids intrude structures marked by a stratigraphic discordance and are variably sericite altered. Of note is that the granitoids post-date the D1-D2 deformational events and host a brittle vein style of gold mineralization.

The regional stratigraphy trends in a NE direction, while in the middle of the Nkran pit the stratigraphy trends north. The stratigraphic discordance in the centre of the pit correlates with both the southern extent of the granite intrusion (GR01) at upper levels and the presence of sandstone-dominant stratigraphy. Phyllites locally are observed to splay and merge along strike, and mark zones of higher strain (shear zones) within a more competent sandstone dominant package and tonalite. Duplex structures present through the centre of the pit, cut the GR01 granite, and repeat the sandstone-dominant stratigraphy along sheared phyllites and tonalite contacts.

Three predominant deformation/geotectonic phases are identified at the Nkran area:

1. Closure of the Kumasi Basin through NW-SE compression


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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2. Change/rotation in stress field resulting in SW-NE compression

3. Change/rotation in stress field resulting in NE-SW compression

Figure 7-6 shows a plan view of the geology at Nkran.

Figure 7-6 Nkran Plan View Pit Showing Geology
Source: Asanko Gold Mine, 2021


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Mineralization at Nkran is controlled by an isoclinally sheared fold verging to the north. There is a very strong control on the gold mineralization distribution by structures associated with the Western Sandstone and the Eastern Breccia. The mineralization is concentrated around the limbs of this fold must have occurred in two major phases:

1. Ductile, shear-hosted mineralization, within the NNE-striking, steeply W-dipping GV, CV, and EV systems. These zones typically measure approximately 2 m in wide in the central area, with higher grades associated with the intersection of the lodes and the controlling structures (Freelander, Defender, etc.) resulting in high-grade steeply plunging shoots. These lodes are overprinted by a barren quartz event that significantly disrupts the continuous nature of the mineralization in the central zone of the pit.

2. Cross-cutting, NW to NNW-striking, shallow to moderately NE-dipping brittle quartz-carbonate vein hosted mineralization, and associated sericite-albite-arsenopyrite-magnetite alteration. Steep, narrow (2-5 cm thick) high-grade veins overprint the shallow dipping mineralization. The first set of shallow dipping veins (Figure 7-7) are linked to NE-SW shortening. The second phase of veins were linked to the NNE-SSW extension. This mineralization is predominantly hosted in the folded thickened broad sandstone and granitoid stocks.

Figure 7-7 Nkran Plan View and Cross-section Through Pit Showing Mineralized Domains Based on Grade, Vein Density and Orientation Data
Source: Asanko Gold Mine, 2021

7.4.2 Esaase

Broadly speaking, the Esaase deposit area can be referred to as a 'system of gold-bearing quartz veins hosted by tightly folded Birimian-age sedimentary rocks arranged along an NNE-SSW trending strike'. Since the maiden resource release in October 2007, various simplified geological models have been used to constrain the resource estimation.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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The 2007 maiden Mineral Resource for Esaase used a simple 'two mineral domain' model to geologically constrain the resource, consisting of Hanging Wall and Footwall zones. The Hanging Wall zone consisted of shale and siltstone and the Footwall zone, predominantly greywacke (Coffey, 2007).

The 2019 model used four 'litho-stratigraphic' units (Upper Siltstone, Cobra Unit, Central Sandstone, Python Shear (or Footwall) Sandstone) to constrain modelling (see Table 7-2), all of which were believed to be bounded by NE-SW trending sheared contacts.

Table 7-2 Stratigraphic Unit with a General Description

Stratigraphic Unit

General Description

Upper Siltstone

Interbedded succession of sandstone (Upper Sandstone unit) and siltstone layers. The Mamba shear zone marks the top contact of the unit.

Cobra Siltstone

Distinctive, sheared, and folded pelitic and carbonaceous succession which caps the Central Sandstone. The Cobra unit contains shear-bounded discontinuous shale bands.

Central Sandstone

The Dominant gold-bearing unit is exposed in the Esaase starter pit and represents the principal economic unit.

Python Shear Sandstone

High-strain bounding Python shear with relatively undeformed Sandstone in the footwall which extends to the Viper Shear Zone.

These units are considered valid litho-stratigraphic units for Esaase, although recent work by Pratt (2021) highlights a tectono-stratigraphic unit between the Central Sandstone and the Cobra Unit that he refers to as 'The Mobile Zone'.

The mineralized domain model used currently as a basis for resource modelling is based on recognising the distribution of vein arrays using quartz vein percentages, assisted by orientation data and pit mapping. In addition, the wealth of grade control data to date highlights the distribution of these vein arrays along fold hinges. These grade control patterns are best seen in level plans rather than cross sections due to the steeply northeast plunge to both mineralization and lithology.

The lithostratigraphy and structure is best described in the modified excerpts and figures from Pratt (2021) italicised below:

The rocks are entirely metasedimentary, varying from black, organic-rich mudstones to coarse grained, almost pebbly sandstones (though probable thin, late dikes were also seen in core photos). Examples of sedimentary textures are shown in Figure 7-8. The style of deposition was turbiditic, shown by some normally graded sandstone beds with finer, planar laminated to ripple cross bedded tops. (There are some examples of reverse grading in poorly sorted greywackes.) The pyritous black mudstones are hemipelagites, deposited under oxygen-poor (anoxic) conditions. The pyrite is almost certainly diagenetic. The pyrite was probably remobilized during metamorphism and hydrothermal alteration. The grade of metamorphism is probably low greenschist (indicated by lack of true mica schists/phyllites and the presence of cordierite (or andalusite). The main minerals are very fine-grained white mica, quartz, and feldspar. Feldspar seems to be preserved in the least altered, footwall sandstones suggesting that the white mica (sericite) in other rocks, particularly the Cobra Unit, is ultimately of hydrothermal origin.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-8 Examples of Sedimentary Textures at Esaase
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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7.4.2.1  Lithostratigraphic Scheme

In the North of Cut 3, the lithostratigraphy comprises five main components, one of which is best described as 'tectonostratigraphic' (see Figure 7-9).

Figure 7-9 Interpreted North Wall of Cut 3 at Esaase
Source: Pratt, 2021

Figure 7-9 shows some of these components, along with en echelon quartz vein swarms (in magenta). Figure 7-9 shows a cross section across the North Wall area of Cut 3, approximating to the photo above. Broadly, the beds in Cut 3 seem to young from East to West (oldest to youngest). They comprise:

1. The footwall grey sandstones and siltstones (the 'Grey Sandstones' or 'Footwall Sandstone' of previous Esaase reports). These thickly bedded sandstones are generally fine grained and well sorted. The main characteristic is the colour: they are grey and there are no intervening black mudstones. There are also common interbeds of sandstone with planar lamination and ripple cross stratification (useful for younging directions - not common in the Central Sandstone). The rocks are tough and relatively fresh, even close to the original ground surface. Some individual sandstone beds are very thick. They can contain large euhedral grains of pyrite. The contact with the overlying Central Sandstone is a fault in the North Wall of Cut 3 (Figure 7-9). It is also important to emphasize that the footwall sandstone contains significant folds.

2. The 'Central Sandstone'. This comprises medium- to coarse grained, moderate- to poorly sorted litharenites (quartz, feldspar, rock fragments). Mudstone rip-up clasts are common (Figure 7-8). Some individual sandstone beds are probably more than 3 m thick (true thickness). Towards the top of the unit, the litharenites are better described as greywackes. There are common thin interbeds of black pyritous mudstones, identical to the 'Cobra Unit'. The sandstones generally have a weak cleavage and are commonly strongly sericitic or clay (smectite) altered.


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3. The 'Mobile Belt' (or 'Dead Zone', because of mostly low gold grades) (Figure 7-9). This belt is of strongly deformed, folded, and sheared black mudstones and sandstones. It is obvious in the North Wall of Cut 3 (Figure 7-9). This zone partly coincides with the previously modelled 'Cobra Shear', but that modelled shear is much narrower and cuts across the Mobile Belt.

4. The 'Cobra Unit'. Pratt (2021) defines this as all the rocks between the Mobile Belt and the Hawk Fault. This complex unit comprises alternating sequences of black, pyritous mudstone- and sandstone-dominated rocks. There are a few packets of thickly bedded sandstone, commonly greywacke (sericitic, with a strong cleavage). One of these is probably the 'Upper Sandstone' mentioned in the past. Overall, the high pyrite content causes a distinct purplish hematite staining. The mudstones commonly have a strong S2 crenulation cleavage and common spherical porphyroblasts of cordierite or andalusite (now altered to fine grained mica). These porphyroblasts are locally overprinted by a halo of Fe carbonate. Fe carbonate also occurs as discrete porphyroblasts (Figure 7-8). There are almost certainly significant tight or isoclinal folds within the Cobra Unit, which repeat the sandstone units, however locating the hinges can be difficult.

5. The Hawk Unit (approximately equivalent of the previously modelled 'Upper Siltstone'). This lies above (west of) the Hawk Fault. It comprises medium- to thickly bedded litharenites, locally coarse grained, with interbedded dark grey mudstones. It weathers in yellow, red, and purple colours, quite different from the Cobra Unit. Oxidation penetrates more deeply in this unit. Younging data indicate that this unit is the right way up (younging Northwest). It shows complex folds, with some gently dipping beds (Figure 7-10).

Figure 7-10 Complex Folding in the 'Hawk Unit' Adjacent to the Hawk Fault Structure

D1 Deformation

The structural 'grain', mostly defined by bedding and schistosity, is the product of a single major deformation (D1). The bedding at Esaase is mostly sub vertical and Northeast-striking. The blue rectangles in Figure 7-11 are downhole bedding measurements. The Dead Zone (Mobile Belt) is clearly visible as a gap in gold grade.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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It is tempting to say that the entire sequence youngs towards the Northwest, like above the Hawk Fault. However, probable tight- to isoclinal folding is present. The hinges are under-represented in the mapping because they are trickier to spot in benches. They are also poorly represented in the downhole oriented bedding measurements. But there is clear evidence of folding; there are reversals in younging direction in drillholes. For example, a large part of KEDD6031, from 340-450 m depth, shows younging downhole (towards the Southeast).

Figure 7-11 Illustrates the Gold-poor/Dead Zone Associated with the 'Mobile Belt'

The North Wall transect in Cut 3 (Figure 7-9) shows five main structural domains:

1. Open to tight folds occur in the hanging wall of the Hawk Fault, a major structure with a probable large post-mineral offset. These folds are very visible in the pit wall, emphasized by variegated colours. The rocks are mainly sandstones. The younging appears to be upward/northwest.

2. Between the Hawk Fault and the Mobile Belt, the Cobra Unit comprises interbedded black mudstones and sandstones, with at least one packet of thickly bedded sandstones (probably the 'Upper Sandstone'). Minor folds plunge sub vertically or steeply towards the northeast.

3. The Mobile Belt has been described already; a belt of strongly folded rocks sandwiched between major faults (it is cross cut by Galiano's Leapfrog-modelled 'Cobra Shear'). It has low gold grade. Fold hinges plunge sub-vertically or steeply northeast.


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4. The Central Sandstone to the Southeast of the 'Mobile Belt' seems to comprise uniformly bedded rocks in the North Wall of Cut 3 (Figure 7-9). Major folds are likely to be present within it. This is supported by younging direction reversals in KEDD956.

5. The footwall grey sandstones also have fold hinges that plunge subvertically or steeply northeast. The main difference is the intensity of deformation and alteration. Sericite is present in the Central Sandstone but absent in the grey sandstones. Veins also tend to be carbonate-dominated. Bedding is less disturbed and sheared. This is confirmed by mapping in Cuts 2 and 3, where fold hinges (Figure 7-12) can be directly measured. Many plunge almost vertically.

The main cleavage (S1) is approximately axial planar to small scale F1 folds. Examples are shown in Figure 7-12.

Figure 7-12 Examples of Steeply Plunging F1 Folds at Esaase
Source: Pratt, 2021


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D2 Deformation

There is localized D2 deformation. This is manifested as kink bands and F2 folds (Figure 7-13 & Figure 7-14). Major folds are not recognized. An S2 crenulation cleavage is widespread within the muddier rocks (see Figure 7-8). Some significant quartz veins occur along F2 fold hinges, suggesting that the D2 event is related to gold mineralization. Of note, the S2 crenulation cleavage orientation is quite variable, suggesting that it may reflect local forces, due to movement on nearby faults/shear zones.

Faults and Shear Zones

Mapping and logging at the north end of Cut 3 show numerous significant northeast-striking, subvertical faults (Figure 7-9). They comprise narrow zones (mostly < 1 m) of gouge and sheared/broken rock and are commonly hosted by ductile black mudstones. Apparent 'drag' folds are common in the foot- and hanging walls. The 'Mobile Belt' comprises of two subparallel faults (including the 'Cobra Fault') with a zone of intense folding, transposed bedding, shearing and S2 crenulation between. Figure 7-15 shows some textures from the 'Mobile Belt'.

To best understand the structure of Esaase, drill data should be viewed perpendicular to the average fold axis. Doing this, for example with the exploration and grade control assay data, seems to show evidence of folds. The key to understanding the distribution of the lithostratigraphic units, arrays of en echelon quartz veins, and, ultimately, gold grade, lies with these folds.

There are also multiple shear zones/faults within the Cobra Unit and within the Central Sandstone. It is strongly suspect that these multiple shear zones/faults have been mis-correlated between holes. The simplest parameter to model is the first appearance of thick sandstones (top of Central Sandstone). This contact is faulted and sheared in Cut 3, but, in some places, it seems like a normal lithostratigraphic contact. The contact is also commonly marked by the appearance of major, en echelon quartz tension gash veins (because the sandstone is more competent).

Veins

There is a clear correlation between the major quartz veins and gold grade. In drill core, the veins commonly present as en echelon tension gash veins at low angle to the core axis (Figure 7-16 and Figure 7-17). This is borne out by mapping, which shows swarms of veins that consistently strike anticlockwise of the structural grain, approximately north-south and sub vertical to northeast dipping. This implies a component of sinistral movement on the controlling structures (faults).

Some pertinent observations regarding veins at Esaase:

1. Veins within the competent sandstones can appear relatively planar and undeformed (though some are gently folded and boudinaged) (Figure 7-16 and Figure 7-17). However, these same veins can be traced laterally into more ductile units where they become sheared, parallel to the S1 cleavage and folded.

2. The larger, tension gash veins have stylolites of organic material (Figure 7-17).

3. Some quartz veins are folded in a ductile fashion and show an axial planar cleavage which seems to be S1 (Figure 7-16).

4. Even lithologies that may be considered as ductile, locally contain en echelon to sigmoidal tension gash veins that carry gold grades. See KEDD956 @ 218.8 m. In other words, the veins are not restricted to certain rock types.

5. Veins seem to be thicker within more competent rocks (thickly bedded sandstones). This is obvious in the North Wall of Cut 3 (Figure 7-20).

6. The quartz veins are dominated by quartz, but can contain orange weathered Fe carbonate, light grey carbonate, minor pyrite, rare arsenopyrite, and light green mica (probably sericite) (Figure 7-16 and Figure 7-17).

7. Veins within the grey footwall sandstones seem to be more carbonate-dominated.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-13 Examples of Deformation Fabrics at Esaase
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-14 Examples of F2 Folds and S2 Crenulation Cleavage at Esaase
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-15 Textures from the 'Mobile Belt' at Esaase
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-16 Vein Textures at Esaase Part 1
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-17 Vein Textures at Esaase Part 2
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Controls on Gold Mineralization

Gold at Esaase occurs in Northeast-striking, sub vertical corridors, parallel to the structural grain. But it is not clear whether these corridors are controlled principally by through-going faults/shear zones or by rock type, or a combination of both. The best understanding on the controls on gold comes from the exposures north of Cut 3. Here gold grade can be compared directly with mapped structures.

The strong ductility contrast between the Central Sandstone and the ductile 'Mobile Belt' (mostly black mudstones of the Cobra Unit), is a clear example of 'contact-related' orogenic gold mineralization. The Central Sandstone is clearly a good competent host for quartz veining and has quite a wide area of mineralization (visible in the tension gash veins of Figure 7-16 and Figure 7-19. The tension gash veins strike anticlockwise of bedding, suggesting a component of contemporaneous sinistral shear along the principal faults. The abrupt decline in gold grade to the Southeast seems to coincide well with the fault shown in Figure 7-20, which also marks a change in alteration (less sericite and pyrite). This strongly suggests a post-mineral offset on this fault. (The closest modelled fault in the Galiano Leapfrog model is the 'Python Shear').

Figure 7-18 shows the grade shapes (in blue) with, and without, the gold grades.

Figure 7-18 Grade Control Drilling Patterns Highlighting the Distribution Around Folds
Source: Pratt, 2021

The most striking feature is the lack of gold in the 'Mobile Belt' (or 'Dead Zone' - shown in orange above). This is perhaps because the (dominantly) black mudstones were not a good host for veining. However, the major faults on either side of the 'Mobile Belt' were clearly a major control on gold. Their immediate foot- and/or hanging walls are zones of grade, likely explained by swarms of en echelon quartz veins.

There are also bends in the mineralization shapes, suggesting that folds are present and that favourable lithologies (massive sandstones) are mineralized. The most pronounced 'bends' occur in the South, in Cut 2. Mapping along the west wall of the pit indicate that the Central Sandstone is folded in a steeply plunging anticline/syncline pair. In fact, there may be multiple folds; the fold pair may be a simplification.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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The fold hinges and limbs are mineralized with gold, suggesting this was a favourable area. The resolution in the grade control drilling is not quite sharp enough to decide if the sandstones within the Cut 2 folds host 'disseminated' gold (veins everywhere) or are cut by numerous corridors (mineralized faults or kink bands) of vein swarms. An example on the west side of Cut 2 is shown in Figure 7-19. It clearly shows a northeast corridor of veins, apparently without a major controlling fault. This belt of veins cuts across the lithostratigraphy but the veins are thicker in the sandstones. It may be comparable to the 'kink band' at the north end of Cut 3, or it may be developed along an incipient fault that never developed fully. Figure 7-19. shows an example of how, within this belt of veins, the veins swell in the more competent sandstone.

Figure 7-19 NE Corridor, Illustrating the en Echelon Tension Gash Vein Arrays
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 7-20 Stereographic Plots for Veins and North Wall of Cut 3 Showing Vein Distribution in Various Units
Source: Pratt, 2021


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Figure 7-21 shows a simple model to explain the styles of mineralization at Esaase. Two styles are recognized:

1. The dominant control is sub vertical northeast-striking faults and shear zones. The faults are mostly not mineralized themselves, though there is some evidence of informal miners chasing some very narrow, late brittle faults. They probably also have a strong post-mineral component of movement. But the faults are flanked by belts of en echelon veins with gold, particularly where the adjacent host rock is competent sandstone ('contact orogenic'). This explains why the best grades are in the Central Sandstone. It is much more competent than the adjacent Cobra black mudstones. The veins lie anticlockwise of the fold hinges, suggesting a component of sinistral movement. There is also evidence that sandstones within the Cobra Unit were more favourable for vein development.

2. The second style comprises swarms of en echelon veins, kink bands and zones of incipient faulting that traverse various rock types. Within these belts, the veins are thicker, and grades higher, where they traverse competent sandstone.

Figure 7-21 Schematic Geological Model for Fold Mineralization at Esaase
Source: Pratt, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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7.4.3 Akwasiso

The Akwasiso deposit lies some 4 km NE of the main Nkran deposit and geologically bears many similarities to Nkran. A granite intrusion surrounds a 080° dipping cross structure and mineralization hosted in bounding 035°N sub-vertical shear structures transgressing a sandstone/siltstone sequence.

The deposit is predominantly underlain by Lower Birimian metasedimentary rocks with dominant lithologies being sandstone, siltstone, shales, and a granitic intrusion. The contact between these sedimentary units is intruded by granitoids mainly of felsic composition (belt granitoids), which form elongated bodies parallel to the regional shears. In many areas, the contact between the metasedimentary rocks and the granitoids is associated with higher grades of mineralization. The metasedimentary rocks occasionally host disseminated sulphides and carbonates. Pyrite, the most prevalent sulphide, is most often oxidized to limonite or leached out leaving cubic casts. Carbonates, phyllites, graphitic schists, and volcaniclastics constitute the major components of these supra crustal rocks. They have well-developed schistosity that is parallel to bedding, striking NE usually between 40° and 50° and often dip steeply to either NW or SE away from the granitic body. The rocks are generally foliated with the shales displaying better development of foliation planes than the sandstones. Foliation dips steeply and slightly oblique to bedding.

Figure 7-22 Akwasiso Plan View Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-23 Akwasiso Cross-section Through the Pit Showing Geology

The sandstone unit appears to be the favourable host rock for mineralization where more brittle quartz-carbonate veins are localized. A plan view and cross-section at Akwasiso showing the deposit geology is provided in Figure 7-22 and Figure 7-23.

Akwasiso represents a smaller scale version of Nkran. Two shear zones are controlling the mineralization. The eastern mineralized envelope is associated with felsic porphyry emplaced along a sandstone siltstone contact. The intrusive seems to have occurred in a dilation jog with a potato shape plunging steeply to the north and terminated abruptly to the south. It is about 150-170 m along, and about 40-50 m across strike.

Mineralization is associated with increased carbonate quartz veining, quartz flooding in the felsic porphyry, arsenopyrite, sericite, and chlorite alteration. The alteration is pervasive with the granite and the walls of the country-rock. Higher grade intersections occur at the margins of the sandstone with the granite.

The other mineralized envelope is a stockwork of extension veins along a shear zone to the west occurring in a sandstone formation. The mineralization is 7-10 m wide and about 300 m along strike, crossing from one end of the pit to the other. The alteration assemblage consists of quartz carbonates, arsenopyrite, sericite, and chlorite, and pyrite. Figure 7-24 below shows the plan view of the mineralization envelopes at Akwasiso.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-24 Plan View of Akwasiso Mineralization Envelopes at Akwasiso

7.4.4 Abore

The Abore deposit is located on the Abore-Esaase shear corridor which also hosts the Esaase deposit. The main rock types observed within the Abore pit consist of carbonaceous shale, siltstone (phyllite), thinly bedded wacke, and thickly bedded sandstone. The sedimentary sequence has been intruded by a granitic (tonalitic) intrusion. For the development of the geological model, the various lithologies have been grouped into the following:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Several foliation and bedding relationships are observed at the Abore deposit. The most common feature is a pervasive foliation that is well developed in the fine-grained siltstones and shales and to a lesser extent in the coarser interbedded sandstone and wacke sequences. A strong foliation (040° strike and steep dip west) is also present on both the hanging wall and footwall margins of the granite, indicating emplacement before deformation. The hanging wall sequence of interbedded siltstone, shale, and wacke is significantly more deformed and foliated than the footwall sequence of sandstone with minor wacke, with several shears, trending on a bearing of 020°. These shears developed preferentially within the carbonaceous shale-rich units.

The presence of large-scale folding within the Abore pit is supported by the observation of opposing foliation/bedding relationships within the drill core. The second notable folding event is an NNE trending, steep north-westerly dipping foliation which cuts the earlier 040° trending fabric. Several of these structures are recognizable within the pit. These structures appear to be spatially associated with high-grade gold trends. A plan view and cross-section at Abore showing the deposit geology is provided in Figure 7-25 and Figure 7-26.

At least two (potentially three) phases of mineralization are recognized at Abore. Mineralization is constrained within the granite, with the overall trend of mineralization being parallel to that of the stratigraphy.

The dominant phase of mineralization is hosted in shallow west-dipping 1 cm to 10 cm thick quartz vein arrays which have developed primarily along the eastern margin of the granite contact and the sandstone-wacke dominated stratigraphy. Minor disseminated alteration is observed, despite the significant hydrothermal (sericite and arsenopyrite) alteration associated with the mineralized zones. Vein density, rather than vein thickness, seems to be indicative of higher-grade zones. Analysis of vein orientations showed that two vein types of shallow west-dipping and steep west-dipping occur.

Analysis of the grade control data shows discrete NNE zones of high-grade mineralization that have developed in the boudin necks of the granite bodies relating to early NNE trending structures. It is probable that these pre-dates the quartz vein-hosted mineralization, and is similar to that of Nkran, where shallow west-dipping vein arrays overprint steep, high-grade mineralization.

These same NNE bearing structures dextrally offset mineralization in at least three places along the deposit, which in part helps constrain proposed pit shapes (Figure 7-25 and Figure 7-27).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-25 Abore Plan View Showing Drill Hole Distribution and Pit Shells

Figure 7-26 Abore Cross-sectional View Through the Pit Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-27 Abore Longitudinal-Section Through the Pit Showing Geology

7.4.5 Asuadai

The Asuadai deposit is located on the regional NE trending Nkran shear zone, approximately 10 km a long strike from Nkran. The prospect features a massive intermediate (tonalite) granitoid hosting a quartz stockwork system.

The main rock types observed within the Asuadai pits consist of thinly bedded carbonaceous shale, siltstone (phyllite), and more thickly bedded wacke and sandstone. Two narrow granitic intrusions (diorite dykes) intrude the metasedimentary sequence on the boundary between the two main sedimentary domains. Extensive shearing in places associated with silica flooding (and associated alteration), makes it difficult to determine the volcanic component of these rocks.

The general geology of the deposit may be broadly subdivided into two main sedimentary domains:

Bedding trends on a bearing of 40°, with local variations, along major structures of up to 00°.The stratigraphy at Asuadai has, like Nkran, been isoclinally folded and dips steeply (approximately 70°) to the west. The stratigraphy is locally imbricated and transposed along major structures which trend on a bearing of 00°.

As with Nkran, Asuadai is located on a 20° trending jog on a regional 35-40° trending structure and is characterized by phyllites dominant on the western margin and sandstone dominant on the eastern portion of the deposit. The granite forms the core of the deposit and is bounded by the two main sedimentary sequences.

Figure 7-28 illustrates the geology at Asuadai in plan view and cross-section.

The Asuadai deposit is characterized by preferential alteration of the sandstone and wacke (to a lesser extent) lithologies to a sericite-magnetite (±albite) assemblage. This alteration style appears to be distinctive to mineralization associated with the Nkran regional structural trend. Various stages of arsenopyrite and pyrite are observed, either disseminated throughout the core or as selvages to gold-bearing quartz veins. Arsenopyrite appears to be dominantly associated with the shallow SW dipping vein arrays, with significant disseminated alteration occurring within the granitic intrusion. Siltstone (and carbonaceous shale) lithologies are generally unaltered.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Early ductile mineralization appears to be associated with silicification and minor pyrite. The extensive overprinting and later reactivation of these structures makes it difficult to establish a distinct alteration package.

The deposit is relatively complex with several controls of mineralization that influences the geometry of the mineralization. Two distinct styles of mineralization are recognized:

1. Steep ductile type mineralization associated with the metasedimentary lithologies: this style was selectively overprinted by a later brittle brecciation event. This mineralization parallels bedding, or foliation. Stereographic projections of vein arrays show a 020° to 040° orientation dipping steeply towards the west. The steep ductile mineralization is seen to bind the granitic intrusion. This mineralization is also associated with structures parallel to the main granitic intrusion.

2. Shallow dipping quartz veins: This is the dominant phase of gold mineralization at Asuadai and consists of veins that vary in thickness from 1 cm to 60 cm. The flat-lying vein arrays are best developed in the granite. The veins have associated sericite-albite-arsenopyrite-magnetite alteration.

Figure 7-28 Asuadai Plan View and Cross-section Through Pit Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

7.4.6 Adubiaso

The Adubiaso geology comprises a sub-vertical stratigraphy of interbedded greywacke and phyllite, with three sub-vertical granite (porphyry) dykes obliquely cross-cutting the stratigraphy. A steep dipping (65° E) quartz vein system cuts across Birimian metasedimentary rocks, which dip steeply at 75° to the west. The vein system appears to be related to a NE fracture system (distinct from the Nkran structure) along the contact zone between dominantly phyllitic units on the east and coarser greywackes on the west, which host most of the gold-bearing veins. The central part of the vein system is 15 m to 20 m wide, but it tapers to about 10 m at both ends; the vein system has a strike length of about 700 m although the main area of economic significance is the central 300 m of the zone.

As at Nkran, narrow granitoids run generally parallel to the Adubiaso ore body in the pit area, but these are unmineralized. It is also noteworthy that the gold mineralization is restricted to the quartz veins and the metasedimentary host rocks are essentially barren, whereas at Nkran the gold values extend well into the host rocks.

The geology at the main Adubiaso deposit is illustrated in plan view and cross-section in Figure 7-29.

The Adubiaso Extension (or North) deposit is located to the NE of the main Adubiaso deposit, separated by the broad River Adubia drainage line. The deposit lies on the structure which hosts the Abore deposit known as the Abore shear.

The gold mineralization at Adubiaso occurs along the main NE to SW striking shear vein system in sub-vertically interbedded greywackes and phyllites intruded by later felsic intrusive units. Subtle jogs in the felsic intrusive units give rise to higher grade ore shoots. The ore body plunges shallowly to the NE at 20° parallel to the intersection of ENE dipping veins with the main strike direction.

Mineralization at Adubiaso is split into two phases:

1. Ductile, shear-hosted mineralization, within the NNE striking, steeply west-dipping Nkran Shear Corridor. This zone measures approximately 25 m in width in the central area, thinning to approximately 6 m at the northern and southern ends of the pit

2. Cross-cutting, NW to NNW striking, moderately east-dipping brittle quartz-carbonate vein hosted mineralization. This mineralization cross-cuts the shear zone and porphyry zones, and postdates the early phase of mineralization, are located in the hanging wall and footwall to the central mineralized zone. These structures appear to be spaced 35 m to 60 m vertically.

The deposit extends for some 1,000 m along strike and 180 m depth. The mineralized zones are typically 1 m to 4 m wide, but may occasionally reach up to 20 m. The gold mineralization occurs as free gold and is associated with the NE plunging quartz veins, along the intersection of the metasedimentary units and sheared porphyries.

The mineralized vein set strikes NNW to NNE and dips towards the east, cross-cuts the regional NE striking foliation, and is variably deformed near the shear zone.

A subtle jog in the strike of the porphyries and carbonaceous schist correlates with ore zone terminations. The ore shoots plunge shallowly to the north, parallel to the intersection of the ENE dipping veins with the sub-vertical north to south striking shear zone, and sub-parallel stretching lineation. The ore body occurs parallel to the strike inflection, which would be parallel to the north plunging stretching lineation.

The mineralization shows an overall north-south trend and a broadly anastomosing character. The undulations in the grade outlines are considered to correlate with interpreted NE to SW striking shears that appear to dextrally offset the lithology and mineralization to differing degrees. The overall movement is on a metre to tens of metre scale, with small offsets noted in the geological modelling.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-29 Adubiaso Plan View and Cross-section Through Pit Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

7.4.7 Miradani North

The Miradani North deposit was mined between 1996 and 2016 by previous operators. The pit is 250 m long by about 120 m wide with a depth of about 60 m. Most of the oxide ore is depleted but the fresh rock remains untouched.

The deposit is located on the Datano Shear zone which is the first from the east of five major fertile shear zones across the Asankrangwa belt. This shear zone is known to traverse the Fromenda area to the south and Datano to the north where there are several active prospects for gold. The deposit is 8 km away from the Nkran processing plant and 3 km south of the Midras South prospect.

The geology of Miradani North deposit is akin to the Nkran deposit in several ways. It is located in a dilational jog at the triple junction of NNE-SSW trending regional structures and East-west (080) structures which are underlain by cryptic basement structures.

The stratigraphy is comprised of wackes and intermittent alternating units of sandstones, siltstones, and graphitic shales which are intruded by felsic porphyry. The intrusive unit is about 200 m long, plunges to the south and up to 100m wide at the middle where it was faulted and rotated by a sinistral movement causing shortening and thickening (see Figure 7-30).

The gold mineralization at Miradani North occurs as free gold in association with hydrothermal alteration of carbonate-sericite-arsenopyrite-chlorite-pyrite. The mineralization occurs in veins that at the sandstone /granitic porphyry contact or in the granite where the veins occur either as stockwork or spiderwebs of 1-3 cm long veinlets.

The overall mineralization is controlled by a westward dipping shoot that plunges to the north. The mineralization is controlled by the shape of the intrusive unit and has about 100 m thickness, 250 m strike length, and is continuous at depth with improved grade (see Figure 7-31).

Figure 7-30 Miradani North Plan View Through Pit Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-31 Miradani North Plan View and Cross Section Through Pit Showing Geology

7.4.8 Dynamite Hill

The Dynamite Hill deposit is located on the Nkran shear trend about 7 km north of the Nkran pit and 4 km north of the Akwasiso pit where it offsets a regional north-south mafic dyke and a localized east-west cross-cutting structure. The area is underlain by fine to medium-grained greywackes (intermittent strong alterations) intercalated with argillites (phyllites), and intrusions of altered felsic rock (feldspar quartz porphyry/granitoid), quartz veins, and stockworks. The initial depth of oxidation was between 20 to 50 m below the surface on rugged terrain but a portion of the oxidized rock has been mined out. The deposit was mined in 2018 from an RL of about 330 m to 180 m.

Foliations are mostly parallel to beddings following NE-SW trends and sub-vertically dipping, biased towards the north-west. Local signatures indicate folding of the units with the mineralization localized along the axis of a recumbent fold which is intruded by the feldspar-quartz porphyry plunging steeply to the north. Figure 7-32 and Figure 7-33 are plans and sectional views respectively of the Dynamite Hill deposit showing the US$1300/oz Au and US$1600/oz Au pit shells as well as the mineralized zones and the felsic porphyry intrusion.

Gold mineralization at Dynamite Hill is mostly associated with quartz stockwork hosted within the northwest trending, steeply dipping orebody of strongly altered (chloritic, sericitic, and silicified) wackes, and at the contact between felsic units and foliated meta-sedimentary rocks. Sulphide mineralization, mostly pyrites grading from fine to coarse crystals are present. The defined gold mineralized zone is about 40-50 m in true width and strikes NNE-SSW traced to a depth of about 250 m and still open. The mineralization plunges steeply to the north. Recent drilling does not support continuity to the north, but the mineralization is open to the south but trending progressively weaker. The mined-out area covers a strike length of 250-300 m but mineralization can be traced for 600 m along strike.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 7-32 Dynamite Hill Plan View Through the Pit Showing Geology

Figure 7-33 Dynamite Hill Cross-section Through the Pit Showing Geology


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

8 DEPOSIT TYPES

Two broad styles of gold deposits are present in southwest Ghana:

The primary controls on mineralization in the Asankrangwa Belt are structural in origin. Certain sandstone units within the Birimian metasedimentary package provided favourable rheological conditions that optimized gold deposition often close to major lithological contacts with either Birimian metavolcanic rocks, or Tarkwaian metasedimentary rocks (Griffis et al, 2002). The deposit type targeted by the AGM is this structurally controlled mesothermal quartz vein style mineralization (orogenic gold type deposits). This is the most important type of gold occurrence in West Africa and is commonly referred to as the Ashanti-type. Milesi et al. (1992) recognized that mesothermal quartz vein style deposits are largely confined to tectonic corridors that are often over 50 km long and up to several kilometres wide and usually display complex, multi-phase structural features, which control the mineralization.

There are at least two separate gold mineralising events that are linked to the structural evolution of the area. Mineralization is linked to:

This brittle style deformation postdates the emplacement of granitic intrusive units into the core of the existing deformed and sheared sedimentary rocks. Orogenic gold deposits formed between 2.2 and 2.0 Ga, intrusion-related (and skarn) between 2.2 and 2.1 Ga, and paleoplacer types between 2.06 and 1.8 Ga.

Gold mineralization is associated with major NE striking, 5 m to 40 m wide graphite-chlorite-sericite bearing fault zones. In particular, gold mineralization is developed where the NE fault zones intersect major ENE striking fault zones, and especially where they are recognized to have influenced granite emplacement, alteration and gold geochemical trends.

Left stepping flexures (10 km to 30 km scale) in the NE striking fault zones (which produce more northerly striking fault sections), are important for the localization of gold mineralization. Other local complexities in stratigraphy and fault geometry, associated with major NE striking faults, are also important for example, folds in stratigraphy that may produce saddle reef style mineralization, or fault duplexes.

The most common host rock is usually fine-grained metasedimentary units, often in close proximity to graphitic, siliceous, or manganiferous chemical sediments. However, in some areas, mafic volcanic rocks and belt intrusions are also known to host significant gold occurrences. Refractory type deposits feature early-stage disseminated sulphides in which pyrite and arsenopyrite host important amounts of gold overprinted by extensive late stage quartz veining in which visible gold is fairly common and accessory polymetallic sulphides are frequently observed. This type includes important lode/vein deposits in Ghana such as at the Obotan and Esaase area. A second non-refractory style of gold mineralization occurs in which gold is not hosted within sulphide minerals either in early, or late stage mineralization. These deposit types have lower sulphide content in general and often lack the needle-like arsenopyrite that is common in the refractory type deposits.

The Asanko Gold deposits demonstrate a late (second) phase of gold mineralization hosted in granitoids (Nkran basin type granite), emplaced in regional shear corridors. The deposits are situated within the Birimian metasedimentary units, but the granitoid intrusions and mineralization both occur at contacts between greywacke and carbonaceous phyllite units. The deposits are dominated by D2 regional reverse faulting gold, and only contain quartz vein-hosted free-milling gold lodes.

The deposit types in the AGM area are sufficiently well understood to support the exploration programs and geological models forming the basis of the Mineral Resource estimates.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

9 EXPLORATION

9.1 Introduction

Systematic exploration at the Asanko Gold Mine concessions include regional generative and near mine programs, targeting new gold deposits as well as further delineation of Mineral Resources. Regional prospecting work was initiated in 2014 in collaboration with Corporate Geoscience Group (CGSG), and advanced drilling programs undertaken thereafter from early 2015. Follow-up to this work since 2017 includes:

Work completed under Galiano ownership (refers to post 2007 for Esaase concession, and post 2014 for all other concessions) is described in the following sections.

9.2 Grids and Surveys

All survey grid location information is in WGS 84, Zone 30N Universal Transverse Mercator (UTM) coordinates.

9.3 Geological Mapping

The broad framework of geological understanding on the AGM licences comes from geophysical interpretations completed in 2016 (Figure 9-1). This work has been built on through geological mapping as well as drilling and exposures at the various open pits. Geological mapping on the Asankrangwa Belt is hampered by a paucity of exposed basement rock, with deep weathering and laterite/alluvial cover making it more challenging. Often it is exposures created by artisanal mining workings that provides the most informative outcrop.

Field mapping has been undertaken at the target properties by AGGL geologists. Outcrop and visible features have been mapped and locations identified using handheld GPS. A targeted license-wide program of mapping and sampling was conducted in 2021, focusing on mineralized areas exposed by artisanal miners. This work was beneficial in understanding structural controls on mineralization and targeting of several prospective areas for follow-up reconnaissance-style RC drilling.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 9-1 Regional Geological Interpretation from VTEM Survey
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

9.4 Geochemical Sampling

9.4.1 Soil Geochemical Sampling

Multiple soil geochemical surveys have been undertaken on the AGM licences by various explorers. Since 2017, a total of 1,246 surface geochemical samples (grab, soil, stream sediment) have been taken by AGGL geologists across the greater AGM licences with the focus on generation of greenfield targets. Sample media and year of sampling is detailed in Table 9-1 below.

Table 9-1 Summary of Surface Samples Taken by AGM Since 2017

Year

Channel

Grab

Soil

Total

2017

 

86

740

826

2018

2

11

 

13

2019

 

37

 

37

2021

31

331

8

370

Total

33

465

748

1,246

Sampling points are generated using MicromineTM or ArcGISTM software and downloaded into a handheld GPS. The sampling points are pegged out in the field. Soil geochemical sampling is not conducted in formal settlements, roads, cemeteries and other culturally sensitive areas.

The sampling grid or sampling spacing may vary from one place to another and is determined by factors that control mineralization and the level of information required. Sampling programs are typically undertaken on 400 m x 50 m spacing, and the sampling line's azimuth is determined by the orientation of the structure suspected to be associated with mineralization. In some cases, the sample spacing is reduced to 200 m x 25 m or 100 m x 25 m if broad spaced sampling suggests the need for tighter data density. The depth at which geochemical samples are collected is between 20-50 cm or more precisely on the B-horizon.

Sample sites are located with GPS receiver and entered into database/GIS platform. During sampling, organic material is avoided. The soil fraction is sampled and analysed (generally either bulk soil or a particular size fraction). The regolith landform setting is recorded and range in clast size is estimated. The proportion of transported and in situ lag (based on degree of clast rounding, size of clasts, composition of clasts) is estimated. Lag is swept up with plastic dustpan and brush over about a 5 m diameter area. A sample of approximately 2.5 kg is sufficient. Coarse pebbles and organic material (greater than 1 or 2 cm) are sieved and picked out on a plastic sheet. Figure 9-2 and Figure 9-3 illustrate on a regional level the location of the sampling points.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 9-2 Plan Showing Gold-in-Soil Anomalies
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 9-3 Surface Geochemistry Sampling Locations (2017 to 2021)
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

9.4.2 Trenching

Given the terrane's deep weathering and generally poor exposure, trenching is often the first tool used to assist with mapping areas of mineralization to collect quality geological information or reliable geochemical samples at surface. This information is not used in Mineral Resource estimation, but rather as a guide to drill targeting.

Trenching is undertaken when deemed appropriate to get preliminary information as to the width and structural features of possible exploration targets. In general topsoil horizons are too thick to use this method extensively.

Planned and approved programs are sited with a GPS by a geologist or technician, and after end points of proposed trenches have been clearly marked, must be ground-truthed by a geologist. The trenches are surveyed by the mine surveyor after or during the course of geological mapping and sampling of the trench. The trenches are excavated by excavator or manual labour. All open trenches are barricaded with caution or flagging tapes.

The saprolite exposure and regolith profile in the trench are mapped and the thicknesses measured with reference to the profile line. Rock type, lithological boundaries, structural measurements, visible mineralization, sample intervals and assay are recorded directly to DataShedTM using in a field computer or on a field data collection sample sheet and later entered into DataShedTM.

Trench sampling is carried out by even chipping of the sample using a geological hammer or chisel along the sidewalls of the trench with a collecting cut PVC pipe. The sample is homogenized by rolling it once or twice in a canvas tarpaulin before collecting a split for assay. 2.5 kg of the homogenized sample is collected. The samples are placed in a clean labelled sample bag with the sample number and sample ticket number folded and stapled into a fold at the top of the bag. At the core yard, the labelled samples are sorted and re-checked.

QAQC samples are inserted as per the QAQC protocol (1-3% of total samples for blanks and field duplicates, and 1-7% for standards, or 2 to 2.5 per 20 samples). The samples are then placed in a big white bag and labelled with the project name, sample interval for each big white bag and the number of samples in it. The sample sequence numbers must be written on the big sample bags. Once samples have been bagged, they are ready for dispatch and are not reopened until they reach the laboratory. The analytical request sheet (sample submission sheet) is completed, signed and dated by the project geologist prior to dispatch. The project geologist keeps copies of the analytical request form. An Asanko Gold item removal form is completed by the project geologist and approved by the head of department (HOD) and the security manager before samples are allowed to be sent out of site.

Sampled intervals in the trench are photographed. The hole ID, sample interval and sample ID are written clearly on a white board and displayed within the sample interval before photographing. An example of a graphical trench map from the recent Jeni River trench program is shown in Figure 9-4 below. After data collection, all trenches are backfilled to allow vegetation regeneration.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 9-4 Trench Map from Trench JGTR21-001, Jeni River Prospect

9.5 Geophysical Surveys

Geophysical surveys over the property have included regional aeromagnetic imaging of the Ashanti Belt and adjacent Kumasi Basin by the Ghana Geological Survey, as well as IP ground geophysical surveying and airborne VTEM and magnetic survey centred over specific targets.

Airborne geophysical surveys were commissioned by AGGL during 2015/2016 to advance the understanding of the geological and structural settings of the Asankrangwa Belt. A map of regional VTEM over the AGM license package is shown in Figure 9-5. The regional magnetic and VTEM data for the Ashanti Belt and adjacent Kumasi Basin provide a good indication of the distribution of the principal geological units occurring in the region as well as on the property.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 9-5 Map of Time-Domain EM Over the AGM License Package
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

A ground geophysics orientation study was initiated over the Esaase deposit in 2019 by Planetary Geophysics based in Australia. The orientation survey focused on four surveys that are known to produce useful results for the direct detection of orogenic gold deposits. Surveys completed over the Esaase deposit are as follows:

Eleven Gradient Array blocks and six 2D Pole-dipole lines were read over the Esaase project for a total of 6,700-line metres. The Gradient Array IP survey data was particularly successful and appears to map what is interpreted to be sulphide content at depth (Figure 9-6).

Figure 9-6 Gradient Array Survey Over the Esaase Deposit
Source: Planetary Geophysics, 2020 (units of measure, milli-seconds or 'ms')


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

This work was planned as a 'proof of concept' orientation survey, with the intention of completing a series of much larger gradient array and IP surveys within the Asanko license package. However, the global pandemic in 2020-2021 delayed commencement of this activity. Given the success of this Esaase survey, geophysical coverage of this type has a high likelihood of identifying other zones of high chargeability that may be a proxy for gold mineralization.

9.6 Exploration Potential

Considerable potential exists for the discovery of additional gold resources on the AGM licenses, near existing operations as well as regionally.

9.6.1 Nkran Deeps

Underground mining scenarios have long been considered at Nkran. Resolute Mining included a modest underground resource (Spiers, 2010), and AGM have reviewed the idea of underground mining at Nkran, at a conceptual level. Following completion of Cut 2 however, it was believed that insufficient resources remained at Nkran to support an underground operation. Additional deep drilling is recommended to explore for significant down dip and down plunge mineralization at Nkran.

A number of possible high grade shoot controls have been interpreted at Nkran, all plunging shallow to steeply northeast (Figure 9-7). These high-grade structures, if repeated at depth, could represent a significant step change for the AGM resource potential. Deep drilling to explore for these structures is recommended.

Figure 9-7 Longitudinal Section Through the Nkran Deposit Showing Multiple Shoot Trends That Hold Potential for Additional Resources
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

9.6.2 Miradani Deeps

The Miradani North deposit shows many similarities to Nkran, including a tonalite intrusive association and the existence of high-grade shoots. A well-defined steeply northeast plunging shoot is evident in longitudinal section through the deposit, as seen in Figure 9-8 below. This high grade +80 gm.m shoot remains open at depth and further drilling should be considered to explore for extensions and repetitions to this high grade.

Figure 9-8 Longitudinal Section Through the Miradani North Deposit
Source: Asanko Gold Mine, 2021

9.6.3 Kaniago West

The Kaniago West prospect is located on exploration lease PL6/289 and is 5 km NW of the AGM processing plant. It was acquired as part of the Midlands Mineral Corporation property transaction in 2015. Midlands conducted an aggressive drilling campaign between 2011 to 2012, delineating gold mineralization over a 500 m strike length and a depth of 150 m, open in all directions. AGM followed up this work in 2021, intersecting broad zones of quartz breccia and veining with associated visible gold mineralization. Follow-up drilling is recommended for this prospect.

9.6.4 Midras South

Midras South is located on the Datano Mining Lease, 5 km south of the AGM's processing plant. The drill program at Midras South was designed to expand on the known mineralized systems in the area, and although only partially completed due to access issues, did provide some of the better high grade intercepts this year to date.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The Midras South prospect lies along the Takorase - Afraso shear zone, a laterally extensive structure recognized from airborne VTEM and magnetic surveys and extensively mapped on the ground. Midras South consists of 3 distinct zones of indicated mineralization, inferred to be fault offsets of the one mineralized zone.

Similar in character to Esaase and Kaniago West, indicated mineralization at Midras South is developed within a package of deformed sandstone, siltstone and phyllite. Stratigraphy and structure are both steeply dipping to the northwest as they do for most of the Asankrangwa Belt gold deposits. Indicated gold mineralization at Midras South occurs in association with quartz veining, arsenopyrite and pyrite, within a broader envelope of quartz-sericite-pyrite and carbonate alteration.

9.6.5 Amoaman

AGM acquired the Aburi lease in early 2020, known at that time as the Hawannah Mining Concession. The name was recently changed from Aburi to Amoaman to reflect the nearest community.

Figure 9-9 Interpreted Geology and Mineralized Trends on the Amoaman Property
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Previous explorers Romex conducted exploration including a VTEM survey which included acquisition of a DTM, radiometrics, aeromagnetics and electromagnetic (resistivity). Romex also completed geochemical surveys including stream sediment sampling, rock chip sampling, and soil sampling. This work assisted in defining three mineralized trends, referred to as Mpeasem, Aburi and Asamang (SEMS, 2013). A phase of trenching to test various soil anomalies, and follow-up preliminary drilling was conducted with a focus on these three prospective trends. 43 diamond holes were drilled for 6,930 m, and 61 RC holes for 3,840 m. Continued exploration is recommended for this prospect.

9.6.6 Other Prospects

A number of poorly tested prospective trends recognized during earlier prospectivity analysis were followed up by AGM with mapping and sampling, and in some cases trenching in 2021. These include the Gyagatreso-Kaniago-Abore trend, the Greater Midras-Nkran-Takorase trend, the Datano-Fawotrikye trend and the Abore-Jeni River-Esaase trend. These areas were highlighted due a combination of coincident structural and soil geochemical anomalies, and in some cases topographic highs and may relate to zones of veining and silicification associated with mineralized systems. Follow-up exploration is recommended for these prospects.

Figure 9-10 Mineralized Trends on the AGM License Package Recommended to Follow-up
Source: Asanko Gold Mine, 2021


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

10 DRILLING

Asanko Gold have integrated historical databases with more recent and ongoing drilling programs. Drilling completed under AGGL ownership is described in this section. Unless specified otherwise, all diagrams in this section are sourced from Asanko Gold 2021.

10.1 Type and Extent of Drilling

Surface drilling at AGM included RC, DDH and RCD drilling. Drilling for Mineral Resource delineation focused on Nkran, Esaase, Miradani North, Dynamite Hill and Abore, although extensive drilling has also been undertaken at Akwasiso and Adubiaso. An overview of the historical drilling per deposit is provided in Section 6. Representative plans and sections of each deposit can be found in Chapter 7 and Chapter 14 of this Report.

To date, a combined total of 4,773 evaluation aircore (AC), DD, RC and RCD drill holes totalling 652,425 m have been drilled at the AGM deposits that are the subject of this Report, as well as additional grade control and other drill holes. Mineral Resource definition drilling at AGM mainly includes RC and DDH drilling. A summary of the drilling completed at each deposit that is the subject of this Report, on a yearly basis, is provided in Table 10-1. The table only reflects AC, DDH, RC and RCD drilling. Additional drilling work such as auger and airblast has been completed but is not used in the Mineral Resource estimation.

Table 10-1 Drilling Summary by Deposit (to February 28, 2022)

Prospect

Year

No. of Holes

Number Of Metres Drilled

AC

DDH

RC

RCD

Total

Aboabo

2010

58

 

 

5,522

3,354

8,876

2011

19

 

490

242

3,918

4,650

Abore

2010

30

 

4,887

 

 

4,887

2011

24

 

4,550

 

 

4,550

2020

33

 

 

1,069

4,785

5,854

2021

42

 

429

4,376

1,082

5,887

Abore North

2000

420

 

1,225

31,594

 

32,819

2010

2

 

408

 

 

408

2011

2

 

353

 

 

353

Adubiaso

1996

49

 

 

5,958

 

5,958

1997

8

 

 

876

 

876

1998

11

 

 

1,745

 

1,745

2000

173

 

636

13,114

590

14,339

2009

4

 

614

 

 

614

2010

9

 

1,441

 

 

1,441

2011

35

 

7,636

 

 

7,636

2013

14

 

 

1,359

 

1,359

2016

35

 

 

3,460

 

3,460

2020

5

 

 

162

1,150

1,312



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Prospect

Year

No. of Holes

Number Of Metres Drilled

AC

DDH

RC

RCD

Total

Akwasiso

1996

1

 

250

 

 

250

1997

18

 

1,278

1,098

 

2,376

1998

56

 

825

2,372

 

3,197

2000

102

 

2,736

6,019

 

8,755

2016

51

 

5,829

1,742

1,558

9,129

2017

91

 

315

4,604

4,326

9,245

2020

36

 

643

2,516

3,698

6,857

2021

4

 

 

330

 

330

Akwasiso South

2018

65

 

 

4,946

225

5,171

Asuadai

2000

88

 

329

5,551

 

5,880

2010

15

 

1,740

 

 

1,740

2011

45

 

6,064

 

 

6,064

2012

3

 

653

 

 

653

Esaase B Zone

2007

16

 

301

3,023

 

3,324

2008

17

 

 

1,728

1,630

3,358

2011

73

 

608

7,265

3,660

11,533

Esaase B1 Zone

2007

8

 

1,010

265

 

1,275

2009

2

 

 

 

581

581

2010

1

 

 

 

156

156

Esaase C Zone

2007

5

 

651

 

 

651

2010

6

 

 

897

 

897

2011

2

 

 

177

 

177

Esaase D Zone

2007

1

 

232

 

 

232

2008

35

 

 

3,035

1,845

4,880

2010

3

 

 

150

636

786

2011

17

 

 

360

3,878

4,238

Dawahodo

2011

91

 

 

11,465

 

11,465

2012

13

 

 

1,488

1,223

2,711

Dynamite

2013

90

 

408

10,446

249

11,103

2014

42

 

2,094

4,611

 

6,705

2016

56

 

 

5,176

 

5,176

2021

30

 

 

1,470

4,640

6,110

Esaase E Zone

2008

2

 

 

251

 

251

2009

3

 

 

351

 

351

2011

12

 

 

1,303

802

2,105

Esaase

2020

32

 

1,370

3,370

1,373

6,113

2021

18

 

 

1,184

3,027

4,211

2022

2

 

299

 

 

299

Esaase Main Zone NE

2007

2

 

507

 

 

507

2008

28

 

 

3,161

642

3,803

2009

87

 

 

11,041

2,082

13,123

2010

61

 

 

7,787

177

7,964

2011

35

 

440

2,152

 

2,592



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Prospect

Year

No. of Holes

Number Of Metres Drilled

AC

DDH

RC

RCD

Total

Esaase Main Zone North

2006

14

 

4,084

 

 

4,084

2007

165

 

1,464

20,813

14,095

36,373

2008

175

 

833

23,517

13,625

37,975

2009

24

 

1,627

891

4,413

6,931

2010

89

 

6,652

1,494

17,490

25,637

2011

78

 

3,358

5,285

14,169

22,813

2013

6

 

1,323

 

 

1,323

2018

82

 

 

4,872

 

4,872

Esaase Main Zone South

2007

60

 

382

9,831

1,270

11,483

2008

41

 

225

3,795

6,199

10,218

2009

2

 

412

 

 

412

2010

25

 

1,111

764

3,230

5,105

2011

31

 

32

2,513

2,250

4,795

2013

1

 

100

 

 

100

2018

27

 

 

2,378

 

2,378

Miradani North

2019

12

 

 

 

3,380

3,380

2020

46

 

6,273

198

3,709

10,180

2021

42

 

5,209

2,794

1,057

9,060

2022

2

 

351

 

 

351

Nkran

1995

57

 

4,306

985

1,286

6,577

1997

59

 

100

3,435

1,325

4,860

1998

2

 

 

190

 

190

1999

1

 

 

100

 

100

2000

611

 

32,377

20,500

3,001

55,878

2010

22

 

9,550

 

 

9,550

2011

79

 

34,147

 

944

35,091

2012

443

20,677

546

800

1,976

24,000

2017

11

 

1,700

 

2,237

3,937

2020

72

 

2,693

7,205

1,143

11,041

2022

19

 

8,313

 

 

8,313

Nkran Extension

1998

4

 

 

370

 

370

2000

19

 

 

1,591

 

1,591

2013

10

 

 

1,002

 

1,002

2014

18

 

 

1,786

 

1,786

2016

38

 

 

3,032

 

3,032

2017

24

 

257

930

702

1,890

Nkran NE

2015

4

 

 

368

 

368

2016

4

 

 

352

 

352

Sky Gold

2011

16

 

 

1,687

 

1,687

Total

 

4,773

20,677

178,671

304,289

148,788

652,425

Note: AC - Aircore; DDH - Diamond drill hole; RC - Reverse circulation; RCD - Reverse circulation with diamond tail. The following drilling is excluded from the above - Auger (AG), Rotary Air Blast (AB). Esaase B, B1, C, D & E zones do not form part of the declared Esaase Mineral Resources.

A property wide drill plan is shown in Figure 10-1.

 
Page 93

 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 10-1 Distribution of Drilling and Trenching Across the AGM License Package, on Interpreted Geology


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Plans showing the location of drill collars and drilling type per AGM deposits are provided in Figure 10-2 to Figure 10-9.

Figure 10-2 Plan Showing Distribution of Drill Hole Collars at Nkran Pit
Note: Areas in grey denote galamsey/artisanal mining disturbance areas 

 

Figure 10-3 Plan Showing Distribution of Drill Hole Collars at Esaase
Note: Areas in grey denote galamsey/artisanal mining disturbance areas

 



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 10-4 Plan Showing Distribution of Drill Hole Collars at Akwasiso and Nkran Extension
Note: Areas in grey denote galamsey/artisanal mining disturbance areas 

 

Figure 10-5 Plan Showing Distribution of Drill Hole Collars at Abore
Note: Areas in grey denote galamsey/artisanal mining disturbance areas



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 10-6 Plan Showing Distribution of Drill Hole Collars at Asuadai
Note: Areas in grey denote galamsey/artisanal mining disturbance areas 

 

Figure 10-7 Plan Showing Distribution of Drill Hole Collars at Dynamite Hill
Note: Areas in grey denote galamsey/artisanal mining disturbance areas



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 10-8 Plan Showing Distribution of Drill Hole Collars at Adubiaso and Adubiaso Extension
Note: Areas in grey denote galamsey/artisanal mining disturbance areas

Figure 10-9 Plan Showing Distribution of Drill Hole Collars at Miradani North


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Nkran has been drilled formally from the early 1990s prior to mine establishment and has since undergone numerous RC and DDH drilling and infill drilling programs to define and refine the resource model, as well as relogging of available core materials. Of note, a large proportion of (if not all) Nkran drilled by previous explorers has been mined out.

Drilling at Esaase by Keegan (precursor to Asanko/Galiano) from 2006 to 2012 focused mainly on the NE-striking, main gold bearing structures. An oxide RC infill drilling program was completed in May to June 2018 targeting the two-year oxide pit and drilled a staggered 40 m x 40 m infill pattern to increase the confidence in the mineralization within the upper portion of the deposit. Overall, the drill holes averaged approximately 60 m in depth and were spread along the length of the proposed two-year oxide pit. In addition to this program, 21,000 m of historical diamond drill core was re-logged from a selection of 83 holes covering the full strike of the Esaase Main deposit. A further 6,950 m was re-logged from 38 diamond drill holes covering the Esaase South deposit. In total, approximately 10% of core has been relogged for the purposes of refining the geological model at Esaase. An additional 11,809 m of infill drilling was completed during 2020-2021 to increase confidence and assist with the geological model development.

Resolute originally tested the Akwasiso oxide material in 2001 by RC and DD drilling. After acquiring Akwasiso, Asanko Gold completed further RC and DD drilling, including a second phase of RC and RCD drilling to upgrade the confidence of the Inferred Mineral Resources. Akwasiso was suspended as an operating pit in December 2018, and additional infill RC drilling was undertaken to define the continuation of mineralization below the current pit. Operations recommenced at Akwasiso in 2020. In 2020 to 2021 a program of 7,187 m combined RC and DD drilling was completed to upgrade the resource category and better define granitoid limits.

The Abore and Asuadai project database comprises historical drill hole data from Resolute and PMI. Between 2019 and 2021, AGM drilled an additional 11,311 m from 72 holes at Abore to extend the known resource at depth and along strike to the north. This data is used to upgrade the Abore Mineral Resource.

AGM continued testing the Adubiaso target during 2016 with a RC drilling program successfully identifying over 500 m of strike of additional multiple thin mineralized zones, which have subsequently been infill drilled. During 2016 AGM also conducted RC exploration and RC infill drilling on the NE extension of the Adubiaso pit mineralization. Minor infill drilling was completed at Adubiaso in 2020, for 1,312 m drilled.

Drill traverses for all deposits are generally aligned perpendicular to the local NE-SW mineralized trends. The drill hole spacing varies between the deposits, ranging from 10 m to 20 m across strike to 20 m to 50 m along strike (to define near surface projections of mineralization).

RC, DDH and RCD are the common drilling methods. Shallow drill holes targeting oxidized material and shallow fresh material generally use RC drilling.

The drilling density is considered appropriate to define the geometry and extent of the mineralization for the purpose of estimating Mineral Resources, given the understanding of the local geology, structure and confining formations. AGM's strategy is to conduct drilling sufficient to assume geology and grade continuity to a level to support at least Indicated Mineral Resources and thus support the application of modifying factors in sufficient detail to support mine planning and evaluation of economic viability. Section 14 of this Report summarizes the drill hole data used in the estimation of Mineral Resources. Where concerns over legacy drilling (pre 2014) have been raised and the concerns verified, ensuing drill data has been excluded from use in Mineral Resource estimates. Legacy logging practices (PMI) have been well covered in Spiers (2010) and SRK (2011) and geological information related to these were verified by comparison with nearby AGM drilling where possible. This data has been further validated during generation of drill sections and geological interpretations, where any inconsistencies in geological logs, collar locations and downhole surveys were identified.

RC grade control (GC) drilling is conducted at the Nkran, Esaase, Akwasiso and Adubiaso pits. A summary of the drilling completed by Asanko Gold from 2014 to December 2021 is shown in Table 10-2.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 10-2 Grade Control Drilling Summary by Deposit (2014 to 2021)

Pit

No. of Holes

RC Metres Drilled

Adubiaso

323

11,877

Akwasiso

4320

98,400

Dynamite Hill

854

28,242

Esaase Main

25,686

629,056

Nkran Extension

470

11,028

Nkran

11,550

358,438

Total

43,203

1,137,041

In addition to this, grade control sampling has occurred as summarized in Table 10-3.

Table 10-3 Grade Control Sample Summary by Deposit Since 2014

Pit

COMP_RC

FC

Grab

RC

RPL

Total

Akwasiso

 

 

 

63,282

766

64,048

Dynamite Hill

 

 

 

19,028

33

19,061

Esaase Main

 

 

 

487,234

 

487,234

Nkran Extension

 

 

 

6,809

 

6,809

Nkran

50,186

23

54

170,117

136

220,516

Total

50,186

23

54

727,442

902

797,668

Note: RPL - Ripline; FC - Face channel; RC - Reverse circulation

Since 2014, Asanko Gold has taken a total of 38,469 channel, pulp, DDH and RC samples across the Adubiaso, Akwasiso, Esaase and Nkran deposits, as shown in Table 10-4. These samples are not used in Mineral Resource estimation.

Table 10-4 Drill Hole Sample Summary by Deposit for the Period of 2014 to 2021

Prospect

CHANNEL

CHIPS

DDH

PULP

RC

TOTAL

Abore

 

 

2,859

 

7,902

10,761

Adubiaso

 

 

571

 

3,826

4,397

Akwasiso

 

 

10,818

 

11,864

22,682

Dynamite

 

 

2,217

 

9,290

11,507

Esaase

 

119

2,057

 

9,072

11,248

Esaase Main Zone North

 

 

 

960

3,871

4,831

Esaase Main Zone South

 

 

 

 

2,325

2,325

Miradani North

 

 

12,983

 

5,611

18,594

Nkran

9

 

3,724

 

7,330

11,063

Total

9

119

35,229

960

61,091

97,408

Note: DDH - Diamond drill hole; RC - Reverse circulation.

10.2 Drill Logging Procedures

Geological information gained through the efforts of legacy operators (such as PMI and Resolute) was first validated by check logging and comparison with nearby AGM logged holes before integration into the current database. Logging procedures by PMI are well covered by Spiers (2010) and SRK (2011). The QP has also reviewed this information and considers it of an appropriate industry standard.

Since 2014, logging records include the prospect name, hole ID, person logging, date of logging, depth from/to:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

All logging data is captured digitally and then transferred to Maxwell DataShedTM software. Once imported into DataShedTM, all data is validated and undergoes QA/QC. Validated data is stored in a SQL database and is exported into appropriate file formats for resource estimation in Isatis™ and Datamine™ RM.

10.3 Collar Survey

The proposed drill hole coordinates are prepared by the geologist and approved by the project manager. The geologist provides the field technician with the proposed drill hole coordinates and corresponding location map; and the proposed coordinates are saved in the drill hole database.

The drill hole collar location is marked and surveyed in the field using a handheld GPS to an accuracy of 1 m. If any deviations in the proposed drill hole location are encountered due to topography or other reasons, alternative locations are determined by the field technician and communicated to the geologist for approval before pad construction begins.

Once the drill hole has been completed, the surveyor returns to pick up the "final coordinate" with a total station GPS.

10.4 Downhole Survey

AGM uses the Reflex EZ Shot single shot survey tool in all RC and DD holes. The first survey is collected within the first run (3 rods or 9 m) and subsequently at 30 m intervals. The last run to end of hole (EOH) is surveyed. The down hole survey is monitored by the rig geologist while drilling so that any excessive deviation (0.2 degrees per metre) can be identified and resurveyed. The Reflex EZ Shot tool is a completely manual single shot tool and only gives a read out of the basic azimuth (AZ), dip (Incl), temperature (Temp) and magnetic susceptibility (Mag Field) data which is manually recorded and reported via a Reflex data (template) which is signed by the drilling supervisor.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

10.5 Core Recovery

Core recoveries are typically calculated at the drilling site by qualified technicians or once the trays are delivered back to the core facility/yard and recorded in the geological logs. The recording of recoveries is the responsibility of the geologist. Core recoveries are typically in excess of 95%.

10.6 Core Handling

Prior to loading with core, core boxes are labelled with the drill hole number, box sequence and depth recorded in permanent marker. To ensure that pieces of core are not lost, rotated end for end, or misplaced in the tray the operator reconstructs the core after it has been placed in the tray. Wooden block markers are inserted by the driller to record depth.

A Reflex ACT IID electronic core orientation tool and barrel is used for orienting and marking core. The barrel is oriented using the electronic orientation unit prior to the drill run. The full, oriented barrel is then retrieved, the core aligned and marked using a bottom hole convention. The down hole direction is marked on the core at the base. If two sections of broken core cannot be matched, then no structural mark-up is made for the lower (down hole) part of the core run until the next barrel is retrieved and oriented.

10.7 Core Photography

Prior to cutting, all core is routinely photographed by the geologists both dry and wet. The colour and texture of the rock are best seen when the core is wet but the fracture patterns which are important to the geotechnical study are best viewed when the core is dry.

The project location, drill hole ID, tray number, depths start/end of tray and indication whether the core was dry or wet is written on white board and placed at the top of the box.

10.8 Core Cutting and Sampling

Sampling is undertaken after geological, structural and geotechnical logging. Sampling intervals are selected by the geologist, and for both HQ and NQ core conform to a minimum sample length of 30 cm and maximum of 200 cm. Sample intervals do not cross lithological boundaries as defined by the logging and are defined within similar alteration zones and structural features. The following procedures are followed:

A coloured orientation line is marked along the length of the core to indicate where the core should be cut in two equal halves. The line is traced perpendicular to the stratification; where there is mineralization, the optimum distribution is used so that 50% of mineralization is represented in each half of the core. The same side of the cut core is removed consistently throughout the drill hole (i.e. the right-hand side from the top to the bottom of the hole). The core is cut completely in two halves using an electric diamond blade saw. In the upper oxide zone, where the core is too friable for diamond saw cutting, the core is dry cut or cleaved.

A sampling form is completed with the intervals indicated for the samples. Ticket forms are completed with the drill hole ID number and FROM-TO interval for the sample. The samples numbers must be in consecutive order and are derived from the sample ticket book. Only the sample numbers are written on the plastic sample bags.

Metallic marker blocks are inserted at the start and end of each sample and the number of the corresponding sample is written with felt-tip pen on the core box to the side of the marker. Samples of approximately 2 to 3 kg are collected carefully and placed in plastic bags. The sample number is written on the plastic sample bag with a permanent marker pen. The sample ticket is stapled on the upper part of the bag, and the bag sample number is checked against ticket sample number. The bag is sealed with plastic ties.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

10.9 QC Insertions

Field technicians are responsible for the bulk of QC insertions, overseen by the site logging geologist. Ultimate compliance with procedures is with the Exploration Manager and Unit Manager - Spatial Data. QC insertions are inserted onsite (at the Esaase coreyard for Esaase drilling, and at the Obotan coreyard facility for all other projects).

Figure 10-10 Sample Labelling Example

Each assay/sampling job follows the below steps:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

10.10 Geotechnical Logging

Geotechnical characteristics of the rock mass are described to provide all necessary data for rock mass classification schemes. Logging records include:

Four geotechnical rock tests may be undertaken, including point load testing and tilt testing (conducted on-site), and uniaxial compressive strength (UCS) testing and direct shear testing (conducted at off-site laboratory).

10.11 Core Storage

A core shed facility is located at Nkran. This facility has spacious core logging facilities, a dedicated XRF/spectrometer office, a dedicated core saw/splitter facility, covered core storage on pallets and pallet racking with a forklift, and containerized storage for pulps. With the exception of Esaase, all core from the other deposits is transported to the Nkran core shed for logging and storage.

The storage facility at Esaase consists of sheds with elevated racks on concrete floors that are sheltered from wind and rain. The core is stored following geological logging, photography, core cutting and sampling.

10.12 Density Sampling

The logging geologist selects a 10 to 20 cm length of half core for the density measurement. One representative sample is taken in each 10 m interval of unmineralized core, or in each 5 m interval of mineralized core. The geologist marks with a permanent marker pen the interval of the half core which is to be sampled. A technician labels the density sample with a black permanent marker indicating the hole number and the "FROM" and "TO" measurements. Details of each sample are recorded on a density sample registration form.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The technician in charge of the density measurement takes a photograph of the sample outside the core box with the sample registration details. The photographs are downloaded to a computer. Photographs are named using the HOLE NUMBER_FROM_TO information, and download on the exploration database computer, with a backup in the server. A wooden block is placed in the core box where the sample was taken. The sample interval ("FROM" and "TO") is written on the wedge, together with the word 'Density'. Density is measured at the Asanko lab onsite following the Archimedes method, outlined in Section 11.

Duplicate measurements were taken by the laboratory for every tenth sample. Selected samples (1 in 30), located adjacent to the primary samples, were sent to a second laboratory (Intertek - Tarkwa) for check density measurements.

10.13 RC Sampling

Prior to commencing drilling, a series of sample bags for each hole are labelled with "FROM" and "TO" depths. For the original samples 40 cm x 50 cm bags are used, and for the reject samples 50 cm x 100 cm bags are used. Chip trays are labelled with Hole ID, sample number and From-To depths, as well as any quality control samples with FB (field blank) or FD (field duplicate).

The hole is drilled dry to maximize sample recovery and avoid losing fines, and a rig mounted rotary splitter is used wherever possible. In exploration drilling, a triple-tiered riffle splitter is used whenever a rotary splitter is not available. In GC drilling, a stationary cone splitter is used whenever a rotary splitter is not available. The auxiliary booster and compressor must be operational and used if water is encountered.

The cyclone is continuously monitored to avoid contamination from clogging and to ensure it is cleaned as required, and at a minimum, after completing each hole. The drill rods, down-hole hammer bit and the sampling equipment are cleaned regularly using compressed air, at each rod addition and after each hole. Sample buckets/bags are removed when the hole is flushed by the driller at the change of rods. The triple-tiered riffle splitter is frequently inspected and cleaned with compressed air or by hammering the side of the splitter between each sample, to avoid contamination and ensure representative samples.

Samples are taken at precise 1 m intervals for exploration drilling and 1.5 m intervals for GC drilling with no lag in the sampling. For every sample, the complete sample interval is collected from the cyclone.

Samples of approximately 2-3 kg are collected in the pre-labelled (FROM_TO) plastic bags and sealed with plastic tags. Samples are collected from the drill site every shift and transported to the Obotan (Nkran) and Esaase camp.

In exploration drilling, rejects are placed in plastic bags correctly labelled with FROM-TO depths and the samples bag securely closed. Reject bags are placed on the ground in organized piles. After each sample is placed in a sample bag, the technician takes a sub-sample of the field reject, sieves and washes the sample where fresh, and spoons the sample into the sequential trays. This provides a permanent record of the geology of each sample.

The sampling method (riffle splitter, rotating cone splitter, rotating wet splitter), estimation of recovery (%) and sample condition (dry, damp, wet) are recorded in a log.

A sample weighing program is undertaken on the RC rig, across each shift over a 24-hour period, to ensure that the optimal sample size is being taken, and to determine the recovery. All material reporting through the splitter is weighed for every interval drilled. The A and B samples are weighed to ensure a representative split, and the field reject is weighed to allow calculation of total sample recovery per interval drilled. The A and B samples must be consistently within 10% of the weight of each other. If this is not achieved it must be communicated to the driller, drilling manager and Project Manager so that the rotary/cone splitter can be calibrated.

As the samples are drilled, they are lined-up in order according to the FROM-TO intervals. The ordered samples are checked against the log sheet from the drill rig. The technician then writes the sample bag number on the plastic sample bag according to the number in the log sheet. Sample tickets are stapled to the plastic bags (bag sample number against ticket number is checked).


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

As with diamond core sampling summarized above, field technicians are responsible for the bulk of QC insertions, overseen by the site logging geologist. Ultimate compliance with procedures is with the Exploration Manager and Unit Manager - Spatial Data. QC insertions are inserted onsite (at the Esaase coreyard for Esaase drilling, and at the Obotan coreyard facility for all others). QC insertions are made as follows:

Detailed logging is undertaken by the exploration or grade control RC geologist using the MaxGeo LogChief™ data collection system.

10.14 Pre 2014

Drilling procedures for PMI prior to 2014 are covered in Spiers (2010) and SRK (2011). Procedures followed by Resolute are not well documented. In summary:

Relogging and inspection of sample results from this period indicates drilling, logging, and sampling procedures were similar to the current methods. Recovery and density measurements are less frequent or not recorded. QC insertion types and rates are less than current and in some cases no QC insertion is evident, however this data contributes to an insignificant portion of the Mineral Resource estimate.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11 SAMPLE PREPARATION, ANALYSES, AND SECURITY

11.1 Legacy Data (Pre-2014)

This subsection refers to sample preparation and analyses methods employed by PMI and Resolute (pre-2014) on samples from the Nkran, Abore, Akwasiso, Asuadai and Adubiaso deposits.

11.1.1 Resolute

No detailed breakdown on Resolute sampling and quality control measures was available for review.

11.1.2 PMI

These procedures have been reviewed and discussed by Spiers (2010) and SRK (2011).

In summary, the PMI core sampling procedures are as follows (from Spiers, 2010):

PMI RC sampling procedures as follows (from Spiers, 2010, via pers comm with PMI geologists):

Laboratory location, accreditation status for assay results before 2015 are shown in Table 11-1. Although accreditation is unknown before 2014, these laboratories are operated by reputable independent companies which typically exercise expected industry standards.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-1 Summary of Laboratory Location and Accreditation Status

Laboratory

Locality

Period

Accreditation

SGS

Accra

1995

unknown

Inchcape

Obuasi

1995-1997

unknown

Analabs

Nkran Site

1997-1998

unknown

SGS

Bibiani

2009 - 2012

unknown

SGS

Tarkwa

2010-2011

unknown

Min Analytical

Perth

2011-2014

unknown

ALS Kumasi

Kumasi

2006-2014

unknown

Trans World (TWL)

Tarkwa

2009-2010

unknown

Intertek

Tarkwa

2010-2014

unknown

Performance Labs

Bibiani

2010-2012

unknown

Laboratory sample preparation and analysis methods for assays before 2014 are summarized in Table 11-2.

Table 11-2 Laboratory Sample Preparation and Analysis Methods Before 2014

Laboratory

Locality

Period

Preparation

Au Assay
Method

Lower
Detection
Limit

SGS

Accra

1995

Jaw crush to -6 mm, then cone crushed or disk milled to -2 mm. Pulverisation of 300 g to 1 kg split -200 mesh in labtechnic homogenizing mill

Fire assay

0.01 g/t

Inchcape

Obuasi

1995-1997

Dry, crush, pulp 2 kg. SFA dry at 105 °C, ringmill 500 g to 1.5 kg 75 µms

Fire assay, screen fire assay

0.01 g/t

Analabs

Nkran Site

1997-1998

Drying, jaw crushing to nominal 6 mm to 12 mm. Sample volume reduction - riffle split. Ringmill <1 kg, nominal 75 microns

Fire assay

0.01 g/t

SGS

Bibiani

2009 - 2012

3 kg or less of sample is dried, disaggregated, and jaw crushed to 3 mm. Sample is pulverized to 95% passing 75 µm using an LM2 pulverizer. Two pulp samples are taken for analysis and pulp storage

Fire assay

0.01 g/t

SGS

Tarkwa

2010-2012

3 kg or less of sample is dried, disaggregated, and jaw crushed to 3 mm. Sample is pulverized to 95% passing 75 µm using an LM2 pulverizer. Two pulp samples are taken for analysis and pulp storage

Fire assay, screen fire assay

0.01 g/t

Min Analytical

Perth

2011-2014

3 kg or less of sample is dried, disaggregated, and jaw crushed to 3 mm. Sample is pulverized to 95% passing 75 µm using an LM2 pulverizer. Two pulp samples are taken for analysis and pulp storage

Fire assay

0.005 g/t

ALS Kumasi

Kumasi

2006-2014

3 kg, or less of sample is dried, disaggregated, and jaw crushed with 70% passing 2 mm. Sample is pulverized to 85% passing 75 µm using an LM2 pulverizer. Two pulp samples are taken for analysis and pulp storage

Fire assay, Leachwell bottle roll*, screen fire assay

0.01 g/t

Trans World (TWL)

Tarkwa

2009-2010

3 kg or less of sample is dried, disaggregated, and jaw crushed to 3 mm. Sample is pulverised to a nominal 95% passing 75 µm using an LM2 pulveriser. Two pulp samples are taken for analysis and pulp storage

Fire assay

0.01 g/t

Intertek

Tarkwa

2010-2014

Samples are crushed to 2 mm and pulverised to 75 µm

Fire assay, Leachwell bottle roll*

0.01 g/t

Performance Labs

Bibiani

2010-2012

Samples are crushed to 2 mm and pulverised to 90% passing 75 µm in LM2 pulverisers. 250 g pulp sample taken for analysis

Fire assay, BLEG

0.01 g/t



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2 Current Data (Post 2014)

This section refers to methods employed post-2014 on samples from the Esaase, Nkran, Abore, Akwasiso, Asuadai and Adubiaso, Dynamite Hill, and Miradani North deposits, as well as regional exploration samples. Unless specified otherwise, all diagrams in this section are sourced from Asanko Gold 2021.

11.2.1 Sample Preparation Methods and Quality Control Measures Taken Before Submission to the Laboratory

Diamond drill core samples are determined by the logging geologist and should be between 30 cm and 150 cm in length. Samples must not cross lithological boundaries and must be defined within similar alteration zones and structural features. Samples should weigh between 2 and 3 kg. QC samples are inserted by the logging geologist at the core shed.

RC samples of approximately 2 to 3 kg are collected from the cyclone at 1 m intervals and split in a riffle splitter. If the resultant sample is greater than 3 kg, then the entire sample is re-split. The cyclone is continuously monitored to avoid contamination from clogging and at a minimum cleaned after every hole. The drill rods, down-hole hammer bit and the sampling equipment are cleaned regularly using compressed air. To determine recovery and ensure that the optimal sample size was taken, recovery is monitored by weighing samples at the RC rig.

The geologist ensures that the quality control samples are inserted at the core yard and monitors the dispatch of the samples to the laboratory. A 2 to 3 kg duplicate sample is taken in an identical manner as the original and stored in a pre-labelled sample bag.

To avoid contamination, no metal jewellery is permitted to be worn by the Asanko Gold samplers.

Samples with visible gold were routinely submitted for either screen fire assay or a bulk cyanide leach assay. All sample preparation, apart from discussed above, is undertaken by the preparation and analytical laboratories. The quality of analysis at the laboratories was monitored using blanks, standards, duplicates and check assays.

With the exception of Esaase, all exploration samples are processed and stored at the AGM exploration facilities at Obotan. Esaase RC chips, half-core and core photographs, duplicate pulps and residues of all submitted samples are retained and stored at the Asanko Gold exploration camp at Tetrem.

Grade control samples were collected by reverse circulation drilling with an optimal drilling depth of 30 meters. Samples were taken at regular 1.5 m intervals and 2.5 kg to 3.0 kg of samples were collected using automatic cone splitter mounted on the GC drill rig. All samples were collected into plastic bags, labelled and sealed on site before transported to the Asanko mine laboratory for preparation and analysis. The QP has reviewed the procedures of the RC drilling, sample collection, preparation, transportation, QAQC measures and is of the opinion that the procedures established at AGM met the industry standards of similar mining operations.

Diamond core cutting procedures vary slightly between the earlier work and the current AGM sampling. In both cases an orientation line was drawn on the core and an electric diamond core saw used to cut the core, retaining the left-hand side for reference (when looking down hole). Historical samples were cut 1 cm to the right of the line and AGM samples are cut along the line. Asanko Gold procedures state that the line should be traced perpendicular to the stratification, or where there is mineralization one should try to get the optimum distribution so that 50% of mineralization is represented in each half of the core.

Where core was too friable to cut with a diamond saw, the core was dry cut or cleaved.

Nkran exploration RC samples were taken from the drilling rig using a rotary splitter which produced equal aliquots to mitigate any bias. A 3 kg sample was collected for laboratory submission and coarse rejects of all samples were kept as a backup for at least three months (GC) and six months (exploration).

Esaase and other RC samples are split using a three-tier riffle splitter (1 in 8 split) to obtain a sub-sample of 3 kg or less and collected in pre-labelled plastic bags. Rejects are stored in plastic bags.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2.1.1 Bulk Density Measurements

Esaase bulk density measurements were collected over a range of lithological and weathered profiles. The Archimedes principal was used and is summarized as follows:

Asanko Gold samples are sent for laboratory bulk density analysis using the Archimedes method, methodology as follows:

Duplicate measurements were taken by the laboratory for every tenth sample. Selected samples (1 in 30), located adjacent to the primary samples, were sent to a second laboratory for check density measurements.

11.2.1.2 Quality Control Sample Insertions

QC insertion procedures are adequately covered in Section 10.9 and Section 10.13.

11.2.1.3 Security Measures

At Nkran, individually bagged core and RC drilling samples were packed in polyweave, or heavy plastic sacks, tied with binding wire and prepared for transport to the laboratory. The geologist was responsible for sample security and prior to dispatch, the samples were firmly secured and locked in a designated sample room at PMI's field office.

Esaase (and Akwasiso) sampling procedures required samples to be collected in staple-closed bags once taken from the rig or core-cutting facility. The samples were then transported to the project camp to be picked up by the laboratory truck and taken directly to the laboratory.

The AGM procedure for sample submission is as follows:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2.2 Laboratory Certification

Since 2014, exploration samples are sent to either ALS laboratory in Kumasi, Intertek laboratory in Tarkwa, or the AGM Mine laboratory at Obotan. ALS and Intertek are independent from Galiano Gold Inc. The AGM Mine laboratory is not independent from Galiano Gold Inc.

ALS Ghana in Kumasi received accreditation of ISO/IEC 17025:2005 in 2018 and received ISO/IEC 17025:2017 accreditation in 2020. The scope of accreditation includes analysis for gold by fire assay followed by acid digestion and AAS finish. Before 2018 the laboratory was operating as per the ISO standards but was not certified or accredited.

The Intertek laboratory in Tarkwa received ISO/IEC 17025:2005 accreditation in 2017 and received ISO/IEC 17025:2017 accreditation in 2019. The scope of accreditation included analysis for gold by fire assays followed by acid digestion and AAS finish. Before 2017 the laboratory was operating as per the ISO standards but was not certified or accredited.

The AGM Mine laboratory holds no certification or accreditation. The mine laboratory QAQC procedure and data was independently reviewed by independent consultant, Richard Minnitt (Minnitt, 2020) in November 2020. No significant issues were identified. The QP visited the AGM mine laboratory multiple times in 2021, reviewed the process and interviewed the laboratory personnel, and is of the opinion that AGM laboratory is operated at industry standard. Table 11-3 summarizes primary laboratory location and accreditation.

Table 11-3 Primary Laboratories Between 2014-2021

Laboratory

Locality

Period

Accreditation

Scope of Accreditation

ALS

Kumasi

2014-2021

2014-2020 none
2020 - ISO/IEC 17025:2017

analysis for gold by fire assays followed by acid digestion and AAS finish

Intertek

Tarkwa

2014-2021

2014-2017 - none
2017-2019 - ISO/IEC 17025:2005
2019-2021 - ISO/IEC 17025:2017

analysis for gold by fire assays followed by acid digestion and AAS finish

Asanko Gold

Obotan

2017- 2021

none

none

11.2.3 Laboratory Sample Preparation and Analysis

Table 11-4 summarizes sample preparation methods at each of the primary laboratories.

Table 11-4 Summary of Analytical Laboratories Sample Preparation and Gold Assay Techniques

Laboratory

Locality

Period

Preparation

Au Assay Method

Lower
Detection
Limit

ALS

Kumasi

2014-2021

PREP-31 - 3 kg, or less of sample is dried, disaggregated, and jaw crushed with 70% passing 2 mm. Sample is pulverised to 85% passing 75 µm using an LM2 pulveriser. Two pulp samples are taken for analysis and pulp storage

30 g fire assay and AAS

30 g screen fire assay

0.01 g/t
0.05 g/t

Intertek

Tarkwa

2014-2021

Samples are crushed to 2 mm and pulverised to 75 µm

Fire assay
Leachwell bottle roll*

0.01 g/t
0.001 g/t

Asanko Gold

Nkran site

2017-2021

Samples are crushed to 2 mm and pulverised to 90% passing 75 µm in LM2 pulverisers. 250 g pulp sample taken for analysis

Fire assay
Leachwell bottle roll*

0.01 g/t
0.001 g/t

*Leachwell bottle roll assays used for grade control


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2.4 Check Assay Analysis

There were no check assays for exploration samples done in 2014.

Exploration samples were initially analyzed at Asanko Lab from 2015-2016, and were check assayed at the ALS lab in Kumasi.

Exploration samples analyzed at the Intertek Laboratory during 2017-2021 were sent to ALS.

No check samples have been submitted for grade control samples.

11.2.5 Pre-2020 Quality Assurance and Quality Control Results

SRK, CJM, and CSA Global have reported results of their reviews of the Quality Control results in the 2012, 2014, 2015, 2017, and 2020 technical reports. In 2015 CJM concluded the QA/QC undertaken by Resolute, PMI and Asanko is adequate and that the current QA/QC systems in place to monitor the precision and accuracy of the sampling and assaying are adequate. In 2017 CSA Global concluded there was little to no quality control results available to support historical (Resolute and PMI) assay results and that QC results for Akwasiso and Esaase were insufficient to adequately monitor the sampling and assay contamination, accuracy and precision.

In the 2020 technical report, CSA Global concluded sample preparation, security, and analytical procedures for the Asanko Gold deposits under investigation are acceptable for use in Mineral Resource estimation. CSA Global also identified several QAQC issues and recommended further action to improve the quality of data. Summary comments by CSA Global from their 2020 review are shown in Table 11-5.

No exploration drilling was undertaken at Dynamite Hill between 2017 and 2020, and CSA Global concluded in the 2017 report that sample preparation, security, and analytical procedures for Dynamite Hill were acceptable for use in Mineral Resource estimation. No specific recommendations were made regarding QAQC at Dynamite Hill at that time. The drilling at Miradani was limited to four holes and was not discussed in detail.

The QP has reviewed the CSA Global, CJM and SRK reports and agrees the QAQC procedures and quality control results for sampling before 2020 have provided assay results suitable to support Mineral Resource estimation.

Table 11-5 Summary Findings From Previous QC Reviews

Primary Laboratory Results

Comments

Nkran

No material concerns with cross contamination or assay accuracy and insufficient samples to assess precision for sample from 2017 onwards. Historical data had indications of cross contamination as well as multiple CRM failures, and no precision controls.

Esaase

No material concerns with cross contamination or assay accuracy for the range up to approximately 3 ppm Au. Over 3 ppm Au, there are no controls on assay accuracy

Akwasiso

No material concerns with cross contamination or assay accuracy for the range up to approximately 3 ppm Au. Over 3 ppm Au, there are no controls on assay accuracy; (DD) have acceptable; RC results from the Asanko Gold mine lab have poor repeatability precision

Abore

No material concerns with cross contamination or assay accuracy, insufficient duplicates to assess precision; the proportion of blank and CRM samples included with the primary samples was lower than industry norms.

Asuadai

No material concerns with cross contamination or assay accuracy; insufficient duplicates to assess precision

Adubiaso

No material concerns with cross contamination or assay accuracy; RC sample assay precision is poor; no DD duplicate data available

Check Laboratory Results

 

Nkran

Poor repeatability. Only ten external check samples were available for review



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Primary Laboratory Results

Comments

Esaase

Poor repeatability

Akwasiso

Significant bias but original samples were analyzed at the AGM laboratory using a bottle roll cyanide leach and the umpires at Intertek Tarkwa by fire assay

Abore

Only five samples available for review, therefore no definitive conclusions could be made

Asuadai

Only five samples available for review, therefore no definitive conclusions could be made

Adubiaso

Only eight samples available for review, therefore no definitive conclusions could be made

The QP considers that Table 11-5 above represents an adequate summary of findings from previous QAQC reviews.

11.2.6 Post 2020 Quality Assurance and Quality Control Results

11.2.6.1 Nkran

Seventy-one holes were drilled in between June 1st to September 30th, 2020 at Nkran. No drilling was completed in 2021. Mining ceased early Q2 2020, so no GC were samples submitted. QC insertion rates are summarized in Table 11-6.

Table 11-6 Nkran QAQC Samples For Period 01/06/2020 to 30/09/2020

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

240

-

2.99

CRM

266

-

3.31

Duplicates

260

-

3.24

Total

766

8,022

9.54

Cross Contamination

Blanks were used 240 times during sampling of Nkran drilling program. All blanks passed at ±2 standard deviation.

An example of a Blank control chart is shown in Figure 11-1.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 11-1 Plot of Nkran Blanks for the Period Noted

Assay Accuracy (Bias)

Table 11-7 Standard Materials for Nkran Submitted to Lab - 2020

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp
Value

Exp SD

Mean Au

SD

CV

Mean
Bias

G300-9

FA50_AAS

FA50_AAS

1.5300

0.0600

91

1.5427

0.0678

0.0440

0.83%

G311-8

FA50_AAS

FA50_AAS

1.5700

0.0800

91

1.5711

0.0678

0.0432

0.07%

G910-6

FA50_AAS

FA50_AAS

3.0900

0.1300

84

3.1307

0.1090

0.0348

1.32%

Assay Precision


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-2 Scatter Plot of Nkran Exploration Field Duplicates

Figure 11-3 Half Absolute Relative Difference (HARD) Plot of Nkran Field Duplicates from Exploration

Primary Laboratory Quality Control Insertions


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-4 QQ Plot of Nkran Pulp Duplicates From Exploration

Between Laboratory Bias

Samples from the 2020 Nkran program show no significant cross contamination, systematic assay bias or precision issues.

11.2.6.2 Esaase

Twenty exploration holes were drilled in between January 1st and August 23rd, 2021 at Esaase. QC insertion rates for exploration samples are summarized in Table 11-8.

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

523

 

3.27

CRM

522

 

3.26

Duplicates

524

 

3.28

Total

1,569

15,991

9.81

Table 11-8 Esaase QC Samples for the Period 1/01/2021 to 23/08/2021

Cross Contamination


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-5 Plot of Blanks for Esaase Exploration/Infill Drilling for the Period Noted

Assay Accuracy (Bias)

Figure 11-6 Plots of the Performance of CRM's G308-3 and G319-2 for Esaase Exploration Drilling


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-9 Esaase Exploration CRM Results

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp
Value

Exp SD

Mean Au

SD

CV

Mean
Bias

G300-9

FA50_AAS

FA50_AAS

1.5300

0.0600

68

1.5343

0.0668

0.0435

0.28%

G308-3

FA50_AAS

FA50_AAS

2.5000

0.1100

87

2.5111

0.1074

0.0428

0.45%

G311-5

FA50_AAS

FA50_AAS

1.3200

0.0600

79

1.3552

0.0460

0.0340

2.67%

G317-2

FA50_AAS

FA50_AAS

12.9700

0.4100

47

12.4906

0.4373

0.0350

-3.70%

G901-3

FA50_AAS

FA50_AAS

2.8700

0.1400

9

2.8600

0.1843

0.0644

-0.35%

G910-1

FA50_AAS

FA50_AAS

1.4300

0.0600

50

1.4280

0.0763

0.0534

-0.14%

G910-6

FA50_AAS

FA50_AAS

3.0900

0.1300

84

3.0944

0.0910

0.0294

0.14%

G912-2

FA50_AAS

FA50_AAS

2.5100

0.1500

9

2.4767

0.0731

0.0295

-1.33%

G914-10

FA50_AAS

FA50_AAS

10.2600

0.3800

13

10.4792

0.4156

0.0397

2.14%

G914-6

FA50_AAS

FA50_AAS

3.2100

0.1200

76

3.1864

0.1252

0.0393

-0.73%

Note: * No systematic bias noted; SD - Standard deviation; CV - Coefficient of variation; CRM - certified reference material

Sample Precision

Figure 11-7 Scatter Plot of Original vs Field Duplicates for Esaase Exploration/Infill Drilling


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-8 HARD Plot of Original vs Field Duplicates for Esaase Exploration/Infill Drilling

Between Laboratory Bias

Primary Laboratory Quality Control Insertions


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-9 QQ Plot of Original vs Pulp Duplicates for Esaase Exploration/Infill Drilling

Samples from the 2020 Esaase program show no significant cross contamination, systematic assay bias or precision issues.

Esaase Grade Control QC

Grade control samples were used in 2021 Esaase resource estimation to a limited extent. The QP responsible for Esaase resource model did a thorough review of statistical and spatial distribution of the GC data in comparison with exploration data, and concluded that the GC data was suitable for global resource estimation and short-term mine planning may benefit from the use of GC data in the grade estimation. GC data was used only in the first pass of grade estimation with a maximum of 40 meters range of influence. More details and relevant GC data assessment are presented in Esaase section of Chapter 14.

Table 11-10 Esaase GC Sample Statistics for the Period of 20/11/2019 to 30/10/2021

Laboratories

ASANKO LAB

No. of Batches

2,895

No. of DH Samples

460,048

No. of QC Samples

31,082 (6.8%)

No. of Standard Samples

52,239 (11.4%)

GC samples were assayed at the AGM laboratory by leachwell bottle roll for oxide material and fire assay for fresh material.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

GC Cross Contamination

A significant portion of the results returned greater than 2 times the lower detection limit suggesting the blank being used may not be satisfactorily devoid in gold mineralization or a sample preparation issue in the laboratory.

Figure 11-10 is an example of a Blank control chart

Figure 11-10 Plot of Blanks for Esaase Grade Control Drilling for the Period Noted

GC Assay Accuracy (Bias)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-11 Plot of Various CRM's That Have Exceeded 3SD (Esaase)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-11 Esaase Grade Control CRM Results (Method BR307)

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp
Value

Exp SD

Mean Au

SD

CV

Mean
Bias

G300-9

BR307

BR307

1.5300

0.0600

57

1.5791

0.0462

0.0293

3.21%

G302-3

BR307

BR307

2.3300

0.1200

154

2.3913

0.2626

0.1098

2.63%

G308-3

BR307

BR307

2.5000

0.1100

125

2.5570

0.0476

0.0186

2.28%

G311-5

BR307

BR307

1.3200

0.0600

151

1.3337

0.0669

0.0502

1.04%

G311-8

BR307

BR307

1.5700

0.0800

1,013

1.5653

0.1023

0.0653

-0.30%

G313-4

BR307

BR307

2.0000

0.0800

1,327

2.0962

0.0785

0.0375

4.81%

G314-2

BR307

BR307

0.9900

0.0400

1,650

1.0006

0.2240

0.2239

1.08%

G315-2

BR307

BR307

0.9800

0.0400

1,360

1.0033

0.1404

0.1399

2.38%

G318-2

BR307

BR307

2.0400

0.0700

1,123

2.0731

0.1477

0.0713

1.62%

G396-8

BR307

BR307

4.8200

0.2900

45

4.3610

0.9221

0.2114

-9.52%

G900-7

BR307

BR307

3.2200

0.1600

21

3.1889

0.3067

0.0962

-0.97%

G901-5

BR307

BR307

1.6500

0.0700

1,215

1.5996

0.1200

0.0750

-3.06%

G906-3

BR307

BR307

3.3300

0.1400

32

2.9647

0.3576

0.1206

-10.97%

G907-7

BR307

BR307

1.5400

0.0500

150

1.6881

0.4767

0.2824

9.62%

G909-5

BR307

BR307

2.6300

0.1000

712

2.5687

0.0674

0.0262

-2.33%

G910-1

BR307

BR307

1.4300

0.0600

1,323

1.4388

0.0575

0.0399

0.61%

G910-10

BR307

BR307

0.9700

0.0400

1,134

1.0064

0.2295

0.2280

3.75%

G910-2

BR307

BR307

0.9000

0.0500

468

1.0247

0.2886

0.2817

13.85%

G910-6

BR307

BR307

3.0900

0.1300

3,946

3.0461

0.1722

0.0565

-1.42%

G911-10

BR307

BR307

1.3000

0.0500

1,831

1.3216

0.0845

0.0639

1.66%

G911-3

BR307

BR307

1.3700

0.0600

1,205

1.3466

0.1514

0.1125

-1.71%

G912-2

BR307

BR307

2.5100

0.1100

1,316

2.5415

0.1237

0.0487

1.25%

G914-2

BR307

BR307

2.4800

0.0800

1,202

2.4845

0.1404

0.0565

0.18%

G916-10

BR307

BR307

2.8100

0.1400

1,505

2.6492

0.4006

0.1512

-5.72%

G918-4

BR307

BR307

1.2400

0.0500

1,187

1.3143

0.2676

0.2036

5.99%

G998-3

BR307

BR307

0.8100

0.0500

830

0.7014

0.0888

0.1266

-13.41%

Note: SD - Standard deviation; CV - Coefficient of variation; CRM - certified reference material

GC Sample Precision


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-12 Scatter Plot of Original vs Field Duplicates for Esaase Grade Control Drilling

Figure 11-13 QQ Plot of Original vs Field Duplicates for Esaase GC RC Drilling

Low ratio of blanks to samples in GC RC data is of concern, as is the number of CRM breaches above and below 3xSD. Based on a thorough review of statistical and spatial distribution of the GC data in comparison with exploration data, the wide scatter of values in GC RC duplicate data is not considered a material issue in the context of the deposits resource estimation.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2.6.3 Miradani North

Forty-six holes were drilled between November 20th, 2019 to October 30th, 2021 at Miradani North. QC samples insertion rates are summarized in Table 11-12. This dataset represents the entire dataset used to support grade estimation at Miradani North.

Table 11-12 Miradani North QAQC Samples for Period 20/11/2019 to 10/30/2021

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

569

 

3.25

CRM

567

 

3.24

Duplicates

731

 

4.17

Total

1,867

17,508

10.66

Cross Contamination

Figure 11-14 Plot of Blanks for Miradani North Exploration Drilling for the Period Noted

Assay Accuracy (Bias)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-15 Plot of CRM Standard Performance for G308-3 for Miradani North Exploration

Figure 11-16 Plot of CRM Performance for G910-6 for Miradani North Exploration


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-13 Miradani North CRM Results Showing Mean Bias

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp Value

Exp SD

Mean Au

SD

CV

Mean Bias

G300-9

FA50_AAS

FA50_AAS

1.5300

0.0600

121

1.5389

0.0595

0.0387

0.58%

G308-3

FA50_AAS

FA50_AAS

2.5000

0.1100

134

2.5222

0.0893

0.0354

0.89%

G311-8

FA50_AAS

FA50_AAS

1.5700

0.0800

47

1.5800

0.0600

0.0380

0.64%

G317-2

FA50_AAS

FA50_AAS

12.9700

0.4100

19

13.0188

0.5783

0.0444

0.38%

G910-6

FA50_AAS

FA50_AAS

3.0900

0.1300

157

3.0776

0.1260

0.0409

-0.40%

G914-10

FA50_AAS

FA50_AAS

10.2600

0.3800

71

10.3185

1.0208

0.0989

0.57%

G914-2

FA50_AAS

FA50_AAS

2.4800

0.0800

18

2.5356

0.0713

0.0281

2.24%

Assay Precision

Figure 11-17 Scatter Plot of Originals vs Field Duplicate Samples at Miradani North


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-18 HARD Plot for Miradani North

Between Laboratory Bias

Primary Laboratory Quality Control Insertions

Figure 11-19 QQ Plot For Pulp Duplicates at Miradani North


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

11.2.6.4 Dynamite Hill

Thirty holes were drilled between July 16th, 2021 to September 7th, 2021 at Dynamite Hill. QC sample insertion rates are summarized in Table 11-14.

Table 11-14 Dynamite Hill QAQC Samples For Period 16/7/2021 to 7/9/2021

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

188

-

3.38

CRM

188

-

3.38

Duplicates

188

-

3.38

Total

564

5,554

10.14

Cross Contamination

Figure 11-20 Plot of Blanks Performance at Dynamite Hill for the Period Stated

Assay Accuracy (Bias)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-21 Plot of CRM Performance for G308-3 for Dynamite Hill Exploration

Figure 11-22 Plot of CRM Performance for G910-6 for Dynamite Hill Exploration


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-15 Dynamite Hill CRM Results Showing Mean Bias

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp Value

Exp SD

Mean Au

SD

CV

Mean
Bias

G300-9

FA50_AAS

FA50_AAS

1.5300

0.0600

11

1.5445

0.0548

0.0355

0.95%

G308-3

FA50_AAS

FA50_AAS

2.5000

0.1100

62

2.5485

0.0861

0.0338

1.94%

G311-8

FA50_AAS

FA50_AAS

1.5700

0.0800

48

1.5648

0.0784

0.0501

-0.33%

G910-6

FA50_AAS

FA50_AAS

3.0900

0.1300

67

3.0899

0.1346

0.0436

0.00%

Assay Precision

Figure 11-23 Scatter Plot of Duplicate vs Original Performance at Dynamite Hill


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-24 HARD Plot Analysis of Duplicate vs Original Performance at Dynamite Hill

Between Laboratory Bias

Primary Laboratory Quality Control Insertions

No material failings were observed with cross contamination or assay accuracy.

11.2.6.5 Akwasiso

A total of 40 exploration holes were drilled at Akwasiso between November 20th, 2019 to October 30th, 2021. QC sample insertion rate are summarized in Table 11-16.

Table 11-16 Akwasiso QAQC Samples For Period 20/11/2019 to 30/10/2021

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

214

-

3.19

CRM

220

-

3.28

Duplicates

219

-

3.26

Total

653

6,711

9.73



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Cross Contamination

Figure 11-25 Plot of Blanks for Akwasiso Exploration Drilling for the Period Stated

Assay Accuracy (Bias)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-26 Plot of CRM Performance for G901-3

Figure 11-27 Plot of CRM Performance for G910-6


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-17 Akwasiso Exploration CRM Results

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp Value

Exp SD

Mean Au

SD

CV

Mean
Bias

G300-9

FA50_AAS

FA50_AAS

1.5300

0.0600

74

1.5047

0.0704

0.0468

-1.65%

G308-3

FA50_AAS

FA50_AAS

2.5000

0.1100

13

2.5462

0.0671

0.0264

1.85%

G311-8

FA50_AAS

FA50_AAS

1.5700

0.0800

20

1.5765

0.0472

0.0299

0.41%

G901-3

FA50_AAS

FA50_AAS

2.8700

0.1400

39

2.9156

0.1731

0.0594

1.59%

G910-1

FA50_AAS

FA50_AAS

1.4300

0.0600

4

1.4200

0.0383

0.0270

-0.70%

G910-6

FA50_AAS

FA50_AAS

3.0900

0.1300

70

3.0851

0.1246

0.0404

-0.16%

Note: SD - Standard deviation; CV -Coefficient of variation

Assay Precision

Figure 11-28 Akwasiso Exploration Field Duplicate Scatter Plot


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-29 Akwasiso Exploration Field Duplicate HARD Analysis Plot

Between Laboratory Bias

Primary Laboratory Quality Control Insertions


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-30 Akwasiso Exploration Pulp Duplicate QQ Plots

Akwasiso Grade Control Assays

Grade control samples were also used in 2021 Akwasiso resource estimation. The QP responsible for Akwasiso resource model conducted thorough review of statistical and spatial distribution of the GC data in comparison with exploration data and concluded that the GC data was suitable for global resource estimation and short-term mine planning may benefit from the use of GC data in the grade estimation. More details and relevant GC data assessment are presented in Section 14 of this Report. QC sample insertion rates are summarized in Table 11-18.

Table 11-18 Akwasiso GC Samples for Period 20/11/2019 to 30/10/2021

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

1,566

-

4.82

CRM

1,554

-

4.78

Duplicates

1,564

-

4.81

Total

4,684

32,511

14.41

Cross Contamination


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-31 Plot of Blanks for Akwasiso Grade Control RC Drilling for the Period Noted

Assay Accuracy (Bias)

Table 11-19 shows no significant bias is evident except for CRM BR307 which is a low-grade control sample typically used as a blank.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-32 Plot of CRM G318-2 Performance for Akwasiso GC

Figure 11-33 Plot of CRM G315-2 Performance for Akwasiso GC


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-19 Akwasiso GC CRM Results (Method BR307)

Au Standard(s)

No. of
Samples

Calculated Values

Std Code

Method

Exp
Method

Exp
Value

Exp SD

Mean Au

SD

CV

Mean Bias

BLANK

BR307

BR307

0.0200

0.0100

1,566

-0.0099

0.0014

0.0000

-149.58%

G313-4

BR307

BR307

2.0000

0.0800

6

2.0367

0.0528

0.0259

1.83%

G314-2

BR307

BR307

0.9900

0.0400

232

0.9825

0.0617

0.0628

-0.76%

G901-5**

BR307

BR307

1.6500

0.0700

685

1.5812

0.0985

0.0623

-4.17%

G909-5

BR307

BR307

2.6300

0.1000

43

2.5406

0.0565

0.0222

-3.40%

G910-1

BR307

BR307

1.4300

0.0600

62

1.3566

0.1724

0.1271

-5.13%

G911-10

BR307

BR307

1.3000

0.0500

4

1.2975

0.0126

0.0097

-0.19%

G912-2

BR307

BR307

2.5100

0.1100

14

2.5536

0.1520

0.0595

1.74%

G914-2

BR307

BR307

2.4800

0.0800

508

2.4853

0.1398

0.0563

0.21%

Note: ** G901-5 13 failures, believed due to wrongly labelled standard. SD - Standard deviation; CV -Coefficient of variation

Assay Precision

Figure 11-34 Akwasiso Grade Control RC Field Duplicate Scatter Plot Showing Poor Repeatability


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-35 Akwasiso Grade Control RC Field Duplicate HARD Analysis Plots

Between Laboratory Bias

Primary Laboratory Quality Control Insertions

11.2.6.6 Abore

In previous reviews a recommendation was made to complete infill drilling to address absence of quality control results. A total of 72 holes for 11,312 m were drilled at Abore January 1st, 2020 to June 23rd, 2021 to address this issue. QC sample insertion rates are summarized in Table 11-20.

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material (%)

Blanks

312

 

3.27

CRM

313

 

3.28

Duplicates

312

 

3.27

Total

937

9,543

9.82

Table 11-20 Abore QAQC Samples for Abore for the Period 1/1/2020 to 23/06/2021

Cross Contamination


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-36 Plot of Blanks for Abore Exploration Drilling for the Period Noted

Assay Accuracy (Bias)

Figure 11-37 Plot of CRM G914-2 and G914-10 Performance for Abore Exploration


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 11-21 Abore Exploration CRM Results

STD_ID

Method

Expected
Value

Expected
SD

Number of
Samples

Mean Au

Calculated
SD

Mean Bias

G300-9

FA50_AAS

1.53

0.06

72

1.5113

0.0661

-1.22%

G308-3

FA50_AAS

2.5

0.11

40

2.5011

0.154

0.04%

G311-8

FA50_AAS

1.57

0.08

44

1.5611

0.0663

-0.56%

G317-2

FA50_AAS

12.97

0.41

5

13.118

0.9508

1.14%

G901-3

FA50_AAS

2.87

0.14

26

2.9563

0.2027

3.01%

G910-1

FA50_AAS

1.43

0.06

1

1.4

0

-2.10%

G910-6

FA50_AAS

3.09

0.13

82

3.1044

0.1184

0.47%

G914-10

FA50_AAS

10.26

0.38

40

10.2811

0.6663

0.21%

G914-2

FA50_AAS

2.48

0.08

3

2.6267

0.2875

5.91%

Assay Precision

Figure 11-38 Scatter Plot of Field Duplicates from Abore Exploration Drilling for the Period Noted


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-39 HARD Analysis of Field Duplicates from Abore Exploration Drilling

Between Laboratory Bias

Primary Laboratory Quality Control Insertions

11.2.6.7 Asuadai

11.2.6.8 Adubiaso

Table 11-22 Adubiaso QAQC Samples for the Period 01/05/2020 to 30/06/2020

Reference Material

Number Inserted

Total No of Samples Sent

Percentage of Reference Material
(%)

Blanks

42

 

3.818

CRM

41

 

3.727

Duplicates

41

 

3.727

Total

124

1,100

11.272

Cross Contamination


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-40 Plot of Blanks for Adubiaso Infill Drilling for the Period Noted

Assay Accuracy (Bias)

Table 11-23 Adubiaso Exploration CRM Results

STD_ID

Method

Expected
Value

Expected
SD

Number of
Samples

Mean Au

Calculated
SD

Mean Bias

G300-9

FA50_AAS

1.5300

0.0600

14

1.4943

0.0921

-2.33%

G901-3

FA50_AAS

2.8700

0.1400

11

2.9727

0.1181

3.58%

G910-6

FA50_AAS

3.0900

0.1300

14

3.1029

0.0981

0.42%

G910-1

FA50_AAS

1.4300

0.0600

1

1.4200

0.0000

-0.70%

G907-2

FA50_AAS

0.8900

0.0600

1

0.9500

0.0000

6.74%

Assay Precision


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 11-41 Scatter Plot of Field Duplicates from Adubiaso Infill Drilling

Figure 11-42 HARD Analysis of Field Duplicates from Adubiaso Infill Drilling


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Between Laboratory Bias

Primary Laboratory Quality Control Insertions

Generally good quality data from Adubiaso, with no CRM failures, a good repeatability fit for duplicate data and no contamination issues.

11.3 Qualified Person's Opinion on Adequacy of Sample Preparation, Security

It is the opinion of Qualified Person that the QA/QC data provides reasonable support for the reliability of the sample database for the Asanko Gold deposits under investigation such that it supports Mineral Resource estimation without limitation on confidence classification. After reviewing this data, even though there has been a lot of work done, it is recommended to improve QAQC reporting from the Asanko lab, particularly as it relates to CRM and blank failures. Documentation and reporting of lab check results could also be improved. The QP has reviewed the quality of data and does not believe there is a risk of the data to be used for the resource estimate.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

12 DATA VERIFICATION

Previous extensive data verification has been undertaken by several independent consultants over the periods when Keegan and PMI owned the Esaase and Nkran properties respectively, prior to the Asanko Gold takeover of PMI and the merger of the two entities as Asanko Gold and the commencement of mining from the Nkran pit in 2015. These independent consultants included SRK (2011, 2012), CJM (2014, 2016), CSA Global (2016, 2019). The QP (Greg Collins, former VP Exploration for Galiano Gold) has read the data verification procedures and results in those reports and agrees with their conclusions regarding reliability of the data.

The verification steps undertaken by the earlier mine operators are shown below. The Qualified Person's data verification activities support the conclusions by previous operators.

The current data for the various Obotan and Esaase tenements is based on the available exploration drill hole data. Geological models and litho-domains provided were developed internally using paper sectional interpretations and Leapfrog Geo 3D modelling by Asanko/Galiano Gold staff. Paper sectional interpretations in themselves are a method of cross checking how legacy data compares with adjacent AGM generated data in terms of consistent collar RL's, geology and in some cases, assay continuity. Having reviewed all necessary procedures in place to collect and check data quality, as well as checking the quality of the data itself, the QP is satisfied with the accuracy of the data for the purposes of estimating Mineral Resources. Industry standard QAQC procedures are in place at AGM to ensure quality geological, assay and density data collection.

12.1 Data Validation and Site Visits

The Qualified Person (Greg Collins, former VP Exploration for Galiano Gold) has visited the AGM on numerous occasions during 2021, up to three months at a time. The most recent visit was in November 2021. During these visits, the QP has reviewed the items listed below for current 2021 drilling at Esaase, Miradani North, Dynamite Hill, and Abore:

The Qualified Person, in conjunction with fellow QP Eric Chen, (former VP Mineral Resources for Galiano Gold) also reviewed the following:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

12.2 Database Structure

The database schema used is the Maxwell DataShed™ (MDS version 4.6.4) which has standard constraints, keys and triggers to ensure that only validated data can be loaded. If these constraints, keys or triggers have been edited or removed, invalidated data can be merged into the database, (e.g. overlapping intervals, data that exceeds the maximum depth of the drill hole, etc.).

Standard validation rules in the MDS include the following:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

12.3 Data Review

12.3.1 Exploration Database

Data was extracted from the exploration database for the various projects using bounding values for easting and northings. These data extractions were validated and exported for downstream work.

Extracted drillhole data are in comma-delimited csv format and transferred to the resource QP for each deposit. The resource QP worked closely with the site database and exploration team to conduct further data verification to ensure that data entries in all the drillhole tables are reasonably free of error and consistent before the data is accepted for resource estimation. The verification process is completed with assistance of various built-in tools in 3D geological modelling software programs or generic data processing program (such as Excel), and has included, but not limited to, checking and correcting duplicate records, drillhole interval overlap, drillhole depth mis-match, abnormal collar location, downhole surveys, erroneous assay values, etc.

12.3.2 Grade Control Database

Grade control data was used to a limited extent for the Esaase and Akwasiso Mineral Resources. The data verification for the GC data utilized in these estimates are described in Section 14.

12.4 Qualified Person's Opinion on Adequacy of Data For Purposes Used in Technical Report

The Qualified Person (Greg Collins) has personally reviewed the accuracy of drill hole collars and sample locations, down-hole deviation, the accuracy and internal consistency of lithological and alteration data, and the accuracy and precision of analytical information. The verification activities included a search for factual errors, completeness of the lithological and assay data, and suitability of the primary data. As part of the database verification activities, The QP has also examined assay information and certificates obtained directly from the analytical laboratory.

Personal inspections included reviews of the geological and sample information used in the preparation of the Mineral Resource estimates. The QP is confident that the available information and sample density allow preparation of reasonable estimates of the geometries, tonnage, and grade continuity of the mineralization in accordance with the level of confidence established by the Mineral Resource categories in the CIM Definition Standards. The database fairly represents the primary information and the data therein contained are suitable to support estimation of Mineral Resources.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13 MINERAL PROCESSING AND METALLURGICAL TESTING

13.1 Previous Project Testwork

13.1.1 Metallurgical Testwork 2008 to 2013

Esaase was evaluated in metallurgical test programs between 2008 and 2013. Four rounds of metallurgical testwork were carried out. The findings of each of these testwork programs are comprehensively discussed in the Lycopodium report, completed as part of the feasibility study submission in 2012.

A fifth testwork program was scoped to quantify the metallurgical recovery that could be achieved through the combination of gravity concentration within the milling circuit and flotation on gravity tailings, with a leach on the flotation concentrates. The fifth testwork program took place between 2012 and 2013 at Amdel Laboratories in Perth under the management of DRA. As per NI 43-101 Technical Report "Asanko Gold Project in Ghana - Pre-Feasibility Study" issued June 27th, 2013 (DRA, 2013).

13.1.2 Metallurgical Testwork 2014 to 2016

The AGM Expansion Project testwork was conducted in two testwork programs. Both testwork programs were undertaken by the Perth based, Australian Laboratory Services Pty Ltd (ALS) under the management of DRA. These testwork programs evaluated blends of Esaase and Nkran material for processing at a central facility.

13.1.2.1 AGM Expansion Project - Phase 1 Testwork

As per the Asanko Gold NI 43-101 Technical Report (2015), the following is noted:

This phase of testwork was designed to evaluate the metallurgical response of a gravity-CIL circuit versus a gravity-flotation-CIL circuit for treating blends of Esaase and Obotan feedstock. It was further investigated if it would prove feasible to dedicate specific material types to either one of the two processing routes to optimize overall recoveries and operating costs.

13.1.2.2 AGM Expansion Project - Phase 2 Testwork

As per the Asanko Gold NI 43-101 Technical Report (2017), the following is noted:

The testwork scope of this phase of the project was designed to evaluate the opportunity to process tailings from the gravity-CIL circuit together with the reground flotation concentrate product from a gravity-flotation circuit in a combined CIL circuit, when treating blends of Esaase and Obotan (Nkran) feed types. Additional testwork was undertaken which identified carbon poisoning by flotation reagents to be an added risk to CIL recoveries. Additional DFS testwork on composites of Esaase Fresh and Nkran, was conducted in Q4 2016 to confirm gravity/CIL as the preferred processing route.

As a result of the above investigations, the flotation processing route was abandoned in favour of the gravity-CIL option.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.1.3 Metallurgical Testwork 2018 to 2019

Information in this section is sourced from Asanko Gold NI 43-101 Technical Report (2020).

The initial NaCN concentration in all tests was 300 ppm.

The purpose of these test programs was to address two key technical aspects with respect to the Esaase Fresh component:

The key component of the geometallurgy of the fresh, unoxidized gold mineralization at Esaase, and potentially within the Weakly - Oxidized (WOX) transition zone, is the distribution and abundance of organic carbon (OC) which shows enrichment in the following areas:

One of the planned outputs of the metallurgical testwork program was the development of an unbiased recovery model which considers the distribution and abundance of OC and is therefore applicable to all sections of the deposit.

The OC content variances were determined by drill core sampling and assaying, with the Cobra unit identified as a distinctly elevated OC geometallurgical domain (narrow 2-5 m intervals of greater than 0.5% OC). The OC content levels in the central sandstone zone are significantly lower.

Metallurgical sampling and testing completed in 2018/2019 is better aligned with the growing understanding of the geological model but are biased towards the thinking at that time that high-level OC is equally widespread across all lithologies.

The OC is present in all geological and metallurgical samples tested to date demonstrating various degrees of metallurgical recovery performance. The metallurgical testwork described below does not have the benefit of geological interpretation that has been developed in this phase of study and because of that, certain discounts relating to recovery may have been overstated (preliminary geological review indicates over-sampling of high OC material).

13.1.3.1 ALS Metallurgical Testwork on Esaase Composites

In support of the AGM LOM Study 2020, four defined testwork programs were undertaken at the ALS Metallurgy Services Laboratory in Perth (Western Australia) and one Raman ratio investigation program at Curtin University in Western Australia. The objective of the testwork was as follows:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.1.3.2 Samples' Origins

Samples were derived from a number of geological diamond drill cores and tested at Analytical Laboratory Services - ALS Perth as Testwork programs A19208, A19437, A19681 and A18754 using material  from drill core intervals and RC drilling chips. The identification of samples obtained per testwork phase is shown in Table 13-1.

Table 13-1 Identification of Samples for Esaase Metallurgical Testwork

Testwork
Program

Sample Type

Geological Samples ID

Geological Section(s)

A18754

Reverse circulation

KERC 039, 114, 155, 156, 157, 158, 164, 220, 227, 233

18, earlier testwork

A19208

Selected diamond core

KEDD 162, 550, 813, 989, 6032, KE 6013C

1, 2, 3

A19437

Diamond core

KE6013C, KEDD 6032, 959, 550, 813, 949

16, 23, 24

A19681

Diamond core

KEDD 162, 6032, 582, 509, 863, 862, 860, 302, 537, 821, 334, 822, 864, 832, 784, 785, 480, 488, 754, 913

13, 16, 17, 18, 22, 23, 24

13.1.3.3 ALS Testwork: Program 1 (ALS Report A18754, March 2018)

Program 1 involved ten RC Esaase samples, comprising five Fresh, two Transitional and three Oxide samples).

The following key findings were noted:

Sub-samples of all 10 KERC composites were submitted for preg-robbing characterisation. The results showed poor correlation of OC to the preg-robbing index (PRI) percent.

13.1.3.4 ALS Testwork: Program 2 (ALS Report A19208, October 2018)

Program 2 comprised 39 hand selected specimen samples, that were specifically selected for visible OC content from drill core samples EXES0618 5443-548. Selection of these samples was not based on current knowledge of the mining schedule.

Gold and OC assays were completed with sub-samples prepared for Raman spectroscopy testwork (Program 5) at Curtin University.

The following was noted with respect to the head assays:

Sub-samples of all 39 composites were submitted for preg-robbing characterisation testwork. The results indicate a linear relationship with percentage OC levels and PRI%.

13.1.3.5 ALS Testwork: Program 3 (ALS Report A19437, November 2018)

Program 3 comprised 25 cut core samples (EXES101800001-EXES101800025).


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The samples were subjected to fire assay for gold (and screen fire assay on selected samples) and a multi-element ICP scan for base metals and other elements. Significant variation in the gold values was observed and is indicative of the presence of coarse gold. The preg robbing characterisation tests results indicate a direct linear relationship between the OC value and the PRI.

A total of 19 these Esaase samples were ground to a P80 of 106 µm, and then submitted for gravity/CIL testwork.

Following the above tests, a bulk composite was prepared by combining sub-samples of gravity tailings for the following composites: EXES1018000-06, 16, 23, 24, and 25. Head assays of this composite returned 0.54 g/t Au and 0.60% organic carbon. Its preg robbing index (PRI) was 31%.

Sub-samples of the composite gravity tailings sample were submitted for cyanide leach testwork, to determine the impact of various parameters on leach performance to mitigate the effect of preg-robbing. The results indicate:

13.1.3.6 ALS Testwork: Program 4 (ALS Report A19681, February 2019)

Program 4 comprised 20 core samples (EXES101900001-EXES 101900020), selected on the basis of high visible organic carbon content. The core samples were subjected to gravity concentration with both direct and CIL cyanidation carried out on the gravity tails.

The samples were subjected to fire assay for gold and a multi element ICP scan for base metals and other elements. The following observations were noted:

Total average extraction for direct cyanide leach tests was 57.3%; for fresh carbon CIL tests 80.4%; for site barren carbon CIL tests 74.6%.

All 20 samples were submitted for preg-robbing characterization testwork. The results of this testwork suggest a relationship between the OC value and the PRI.

Representative gravity tails samples of KEDD582 (EXES101900003), KEDD785 (EXES101900016) and KEDD821 (101900010) were blended to generate a gravity tails composite sample (1.02 g/t), sub-samples of which were subjected to CIL leach testwork at a P80 of 106 µm. The test procedure followed the standard but included varying concentrations of diesel added at the start of a 1-hour pre-conditioning phase. These tests were designed to determine if the OC content of the sample could be successfully blinded in order to reduce the preg-robbing characteristic of the material.

In addition, sub samples of the Fresh feed of KEDD582, KEDD 785 and KEDD821 were combined to create a "Combined Fresh Composite". This composite was then submitted for gravity/CIL leach testwork at grind sizes of P80 75 µm and P80 45 µm. The results indicated:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.1.3.7 Characterisation of Esaase Samples Using Raman Spectroscopy: Program 5 (Curtin University Report: April 2019)

The 39 pulverized samples, originating from ALS Test Program 2 (A19208), were received at The Gold Technology Group (GTG) at Curtin University.

The carbonaceous material within each sample was characterized using Raman spectroscopy with the following observations made:

13.1.3.8 Summary of Metallurgical Testwork 2018 to 2019

The testwork results for the relevant ALS reports, A18754, A19208, A19437 and A19681 allude to a correlation between the OC content and the preg robbing index, and that this is biased towards the OC values greater than 0.5%. It is acknowledged however that there may have been over-sampling of high OC material.

Table 13-2 Head Grade Recovery Model Correlations

Material Source

Head Grade Recovery Correlation

M (slope)

C (coefficient)

Upper (Fresh/Trans)

y = 9.600ln(x) + 82.260

9.60

82.26

Cobra (Fresh/Trans)

y = 15.532ln(x) + 56.020

15.5

56.02

Central (Fresh/Trans)

y = 6.202ln(x) + 85.792

6.20

85.79

Python (Fresh/Trans)

=upper

9.60

82.26

Other (Fresh/Trans)

=upper

9.60

82.26

Material Type

Residue Value Au (g/t)

Esaase Oxides*

0.10

Recovery Discount Factor (due to Soluble Gold Losses & Carbon Losses)

0.5%

Note: * A fixed residue grade has been applied to the Esaase Oxide material

It is also acknowledged that, for this suite of tests, the base case cyanide concentrations were lower than plant operating levels at the time. The process plant, which was processing Nkran ore in 2018, added an average of 450 ppm NaCN. ALS testing was carried out with initial NaCN concentrations of 300 ppm. The test results may have been compromised due low cyanide levels.

 


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.1.4 Addendum Testwork A20208 (2019)

13.1.4.1 Nkran Testwork and Past Mine Performance

Over the past mine performance of Nkran (3.5 years) the plant had achieved consistent recoveries exceeding 91.6%, notwithstanding the treatment of a blended ore comprising Oxides, Transition and Fresh and that preg-robbing zones are also encountered in the Nkran pit geology. The plant annualized recoveries are shown in Table 13-3.

Table 13-3 Nkran Past Production Annualized Recovery

Annualized Recovery

2016

2017

2018

2019

Nkran gold recovery (%)

91.6

94.3

93.8

93.8

In October 2019, a testwork program A20208 was undertaken at ALS Metallurgy in Perth (Western Australia). The objective of this testwork was as follows:

The following conclusions were made:

13.1.4.2 Raman Spectroscopy

Preliminary reporting of the results by Curtin University on November 7, 2019.

"Essentially, by comparing the spectra from the Esaase and Nkran spectra with each other and with other spectra from our database, indications are that the carbonaceous material in the Nkran samples is slightly more preg-robbing than that in the Esaase samples, although both would be considered to have low to moderate preg-robbing capacity when compared with the wider dataset. However, the lower normalized PRI values for the Nkran samples relative to the Esaase samples are a little anomalous and I suspect that some of the Nkran samples contain graphitic (non preg-robbing) carbon which may be skewing the results."


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.2 Current Testwork 2021 - Esaase Main Pit

Previous testwork undertaken in 2018 to 2019 largely formed the basis for recovery estimates stated in the 2020 NI 43-101.

Subsequent concerns were raised about the test samples' selection with respect to organic carbon. Section 13.1.3 acknowledges that there may have been oversampling of high OC material.

The lithology of primary focus in the previous work was a black mudstone/siltstone referred to as the Cobra unit. This material is elevated in organic carbon content with respect to the surrounding sandstones. Initial estimates were that the Cobra material comprised approximately 15 percent of the Esaase Main deposit. This is subject to ongoing investigation.

An additional concern was related to the cyanide addition used in previous testwork program. Cyanide concentrations were significantly lower than typical process plant concentrations. It is believed to arise from a misinterpretation of cyanide concentration values quoted, i.e.:

As a result of the above concerns, it was decided to revisit the Esaase recovery modelling. This involved a comprehensive test program that included samples that more broadly, and representatively, portray the Esaase Main pit mineralized domains. Testing also involved higher cyanide additions.

13.2.1 Sample Selection Criteria

Sample selection for 2021 metallurgical test work at Esaase was completed in March of that year by Asanko Exploration team with support from Eric Chen, former VP Technical Services of Galiano Gold, in close consultation with Alan Eslake, Chief Metallurgist on site. The selection process followed the key technical considerations and criteria set by the Asanko technical and operation team:

1. Select from the existing exploration drillholes (as of March 2021)

2. Select core samples only (in order to avoid potential ambiguity in interpretation of test results from RC samples)

3. Select samples primarily from in the Fresh zone, with small portion from Transition zone. No sample from Oxide zone

4. Entire sample set to represent a range of the ore grade materials and have fair coverage of different mineralized zones and litho-stratigraphic domains within the prospect Esaase main resource pit. The 2019 PFS Esaase resource pit shell is used as reference

5. Each interval sample was composed of a series of consecutive drillhole core increments that represent multi-bench mining volumes. Each sample, when grouped with adjacent samples, represents bulk tonnage of material that approximates the amount processed in a roughly 2-3 month period (~1 Mt) at the process plant

6. Each sample was targeted to provide a minimum 15 kg in mass.

Leapfrog Geo 3D software was used to assist the visual and volumetric evaluation of drillhole samples and spatial coverage. Drillholes were displayed and reviewed in 2D and 3D with logged geology, assays, mineralized domain, litho-stratigraphic domain, oxidation, structure and other available geological models as of March 2021, with drillhole intervals selected following the criteria as described above.

Each selected sample was made of a series of individual increments (~1-2 m) of a drillhole, with accumulated average interval length of 20 m.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The preliminary list of selected samples was generated in .csv format with all the individual sample intervals coded with original assays, logged and modelled lithology, alteration, oxidation and mineralized domain. The preliminary list was thoroughly checked and verified with the physical drill cores by the field team, and final selection of samples made with agreement of the site and corporate team. The selected cores were subsequently cut into quarters and each individual interval bagged separately to allow flexibility in managing sample re-compositing if deemed necessary.

The location of final selected samples for metallurgical test work in March 2021 is illustrated in Figure 13-1 (plan view) and Figure 13-2 (long section).

Figure 13-1 Esaase Mineralized Domains and Location of Metallurgical Samples (Plan View)


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-2 Esaase Mineralized Domains and Location of Metallurgical Samples (Long Section)

ALS Metallurgy in Perth, Australia undertook all metallurgical testwork.

The significant number of core increments totalling 838 in number, represented 964 m of total length from 36 holes. Portions of each individual core increment were retained to enable additional testing if required.

Two main tranches of tests were completed. The initial bulk composites' results returned some low recoveries (under conditions of 80% passing 106 µm, 15 g/L activated carbon, 600 ppm NaCN initial concentration and 250 ppm NaCN maintained thereafter, 24-hour retention time), and the decision was then made to test the composites constituents individually for higher definition (i.e. variability).

All composites were created on an equal weight per metre basis. Increments were generally 1 m length. Some intervals were created from 2 m lengths. Core sizes available included PQ, HQ and NQ.

Table 13-4 provides the bulk and variability composites' hole details. This includes the expected gold grades as calculated from the core increments on a weighted (length) basis. Exploration assays had been carried out at Intertek, Tarkwa by 50 g charge fire assay method.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-4 Hole and Interval Data With Expected Composite Gold Head Grades (Esaase)

DD Data 

Bulk Composites 

Variability Samples 

Hole ID

From

To

Bulk
Composite
ID

Expected Au Grades (from
Core Assays)

Variability
Composite ID

Expected Au
Grades g/t

 

 

 

Hole g/t

Comp g/t

KEDD546

192

222

11D1

2.89

1.99

11D1-1

6.49

KEDD727

158

180

 

0.76

 

11D1-2

1.13

KE6001C

119

159

11D2

2.52

2.52

11D2-1

0.86

 

159

190.5

 

 

11D2-2

1.67

KEDD096

214

230

12ND1

0.94

2.75

12ND1-1

0.94

KEDD761

129

143

 

2.39

 

12ND1-2

2.39

KEDD530

257.8

288

 

5.09

 

12ND1-3

5.09

KEDD536

284

301

 

1.26

 

12ND1-4

1.26

KEDD531

224

247

12ND2

1.04

1.51

12ND2-1

1.04

KEDD536

207

235

 

1.52

 

12ND2-2

1.52

KEDD872

215

219

 

1.42

 

12ND2-3

1.42

KEDD820

278

301

 

2.02

 

12ND2-4

1.54

KE6008C

99

119

12SD1

0.94

0.78

12SD1-1

1.02

KE6014C

63

79

 

0.55

 

12SD1-2

0.48

 

97

113

 

 

 

12SD1-3

0.62

KEDD334

193.9

210

 

1.05

 

12SD1-5*

1.05

KE6004C

77

97

13D1

0.96

1.25

13D1-1

0.96

KEDD332

106.2

126

 

2.20

 

13D1-2

2.20

KEDD763

118

148

 

0.82

 

13D1-3

0.98

KEDD335

273

301

13D2

0.82

1.19

13D2-2

0.92

KEDD326

253

276

 

1.57

 

13D2-3

1.76

KE6007C

129

165

13D3

2.08

1.71

13D3-1

2.33

KE6013C

179

205

 

1.61

 

13D3-2

1.61

KEDD709

99.2

122

 

1.13

 

13D3-3

1.37

KEDD532

251

278

13D4

1.32

2.59

13D4-1

1.80

KEDD303

238

272

 

4.38

 

13D4-2

4.38

KEDD336

324

345

 

0.53

 

13D4-3**

0.82

KEDD949

95

107

14D1

0.83

0.83

14D1-2-1

1.18

 

107

135

 

 

 

14D1-2-2

1.00

KEDD520

219.85

248

15D1

0.64

1.04

15D1-2

0.90

KEDD151

216

241

 

0.90

 

15D1-3

0.97

KEDD829

273

303

 

1.53

 

15D1-4

2.09

KE6006C

235

275

15D2

0.85

0.87

15D2-1

0.85

KEDD6031

213

240

 

0.73

 

15D2-2-1

0.75

 

240

265

 

 

 

15D2-2-2

1.00

KEDD099

284

294

 

1.64

 

15D2-3

1.81

KE6005C

152

166

15D3

1.76

1.67

15D3-1

1.76

KEDD750

100

117

 

1.60

 

15D3-2

1.60

KEDD722

114

147

 

1.53

 

15D3-3

1.63

KEDD723

186

201

 

1.97

 

15D3-4

2.11

KE6006C

139

155

15D4

0.91

1.23

15D4-1

1.11

KEDD723

138

168

 

1.15

 

15D4-2

1.29

KEDD721

118

138

 

1.74

 

15D4-3

1.74

Note: *12SD1-5 variability not tested due to anomalous head grade after composition

        **13D4-3 not included in variability testing due to lack of representivity


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.2.2 Bulk Composites Testing (ALS A22281)

Testing methodology of the bulk composites included the following main steps:

Note: 2 samples had the gravity tail CIL tests completed in duplicate for quality control purposes.

The same methodology was subsequently applied to the variability composites with some exclusions including elimination of intermittent leach sampling and reduction of assays to focus on gold. Size deportment and diagnostic analyses on residues were also omitted.

Grind size optimisation tests were not undertaken as part of this project, with the standard mill P80 of 106 µm used for all tests.

Head assays were carried out using the following methods:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-5 Esaase Bulk Composites - Main Elements of Interest (ALS A22281)

ANALYTE Ag
(ppm)
As
(ppm)
Au I
g/t
Au II
g/t
Ctotal
(%)
Corganic
(%)
Cu
(ppm)
Stotal
(%)
Ssulphide
(%)
COMP 11D1 0.3 595 0.79 0.69 0.57 0.45 37 0.18 0.16
COMP 11D2 <0.3 495 0.53 0.57 0.48 0.24 35 0.20 0.16
COMP 12SD1 0.3 690 3.65 6.25 0.63 0.36 34 0.20 0.16
COMP 12ND1 0.3 460 1.26 1.16 0.63 0.42 178 0.32 0.26
COMP 12ND2 0.3 800 1.23 1.13 0.93 0.42 65 0.40 0.36
COMP 13D1 <0.3 395 0.91 0.77 0.66 0.42 32 0.30 0.26
COMP 13D2 0.3 520 0.83 0.84 0.87 0.33 53 0.32 0.28
COMP 13D3 0.3 490 0.97 2.89 0.72 0.27 42 0.18 0.16
COMP 13D4 <0.3 430 2.03 2.04 1.32 0.24 30 0.24 0.24
COMP 14D1 0.3 945 0.46 0.47 1.92 0.54 27 0.30 0.28
COMP 15D1 <0.3 1075 1.26 0.58 1.44 0.30 34 0.32 0.20
COMP 15D2 0.3 355 0.62 0.51 1.41 0.42 33 0.22 0.20
COMP 15D3 0.3 1275 1.95 1.48 1.17 0.30 32 0.38 0.28
COMP 15D4 <0.3 660 1.26 1.27 1.02 0.24 29 0.30 0.30

13.2.2.1 Comparison of Gold Head Assays (Bulk Composites)

Expected composite gold grades were calculated from the fire assay grades of the individual core increments on a length weighted basis. They are compared with the head grades calculated from the gravity/CIL recovery tests (8 kg scale). See Table 13-6.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-6 Esaase Bulk Composites - Comparison of Gold Head Assays (g/t Au)

Composite ID Expected
(Core Grades)
ALS Duplicate
Fire Assay
Fire Assay
Average
ALS Calculated
Head from 8 kg
Recovery Test
% Difference
(Expected vs
Calculated)
11D1 1.99 0.79, 0.69 0.74 1.07 -86
11D2 2.52 0.53, 0.57 0.55 1.17 -116
12ND1 2.75 1.26, 1.16 1.21 1.63 -68
12ND2 1.51 1.23, 1.13 1.18 1.07 -41
12SD1 0.78 3.65, 6.25 4.95 1.47 47
13D1 1.25 0.91, 0.77 0.84 1.22 -3
13D2 1.19 0.83, 0.84 0.84 1.11 -8
13D3 1.71 0.97, 2.89 1.93 1.49 -15
13D4 2.59 2.03, 2.04 2.04 4.71 45
14D1 0.83 0.46, 0.47 0.47 0.85 2
15D1 1.04 1.26, 0.58 1.84 0.83 -26
15D2 0.87 0.62, 0.51 0.57 0.53 -65
15D3 1.67 1.95, 1.48 1.72 2.14 22
15D4 1.23 1.26, 1.27 1.27 1.06 -17
average 1.57   1.44 1.45  

Multi element ICP scans indicate arsenic grades in the range of 355 to 1275 ppm for a simple average of 656 ppm.

Table 13-7 Esaase Bulk Composites - Multi-element Analysis (ALS A22281) - Part 1

ANALYTE

11D1

11D2

12SD1

12ND1

12ND2

13D1

13D2

Ag(ppm)

0.3

<0.3

0.3

0.3

0.3

<0.3

0.3

As(ppm)

595

495

690

460

800

395

520

Al(%)

8.48

8.32

9.04

7.00

8.16

8.16

7.52

Ba(ppm)

500

500

500

400

400

500

500

Be(ppm)

<5

<5

<5

<5

<5

<5

<5

Bi(ppm)

<10

<10

<10

<10

<10

<10

<10

Ca(%)

0.6

0.4

0.3

0.4

0.4

0.2

1.0

Cd(ppm)

<5

<5

<5

<5

<5

<5

<5

Co(ppm)

65

50

70

140

90

65

85

Cr(ppm)

120

140

160

90

100

140

100

Cu(ppm)

37

35

34

178

65

32

53

Fe(%)

4.64

4.44

3.44

3.12

4.78

4.72

4.64

K(%)

1.69

1.70

1.72

1.33

1.73

1.62

1.44

Li(ppm)

65

60

65

65

75

70

65

Mg(%)

1.04

0.96

0.60

0.76

0.84

0.72

1.16

Mn(ppm)

400

200

100

300

700

300

500

Mo(ppm)

<5

<5

<5

<5

<5

<5

<5

Na(%)

1.30

1.22

1.65

1.12

1.02

0.99

1.55

Ni(ppm)

60

55

65

50

60

60

55

P(ppm)

600

600

300

300

400

500

600

Pb(ppm)

<5

<5

<5

<5

<5

<5

5



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


ANALYTE

11D1

11D2

12SD1

12ND1

12ND2

13D1

13D2

SiO2(%)

62.4

61.2

65.2

69.2

62.8

65.6

65.6

Sr(ppm)

200

200

240

200

200

160

200

Ti(ppm)

4400

4400

4400

3400

5600

4200

3800

V(ppm)

112

110

110

86

102

110

98

Y(ppm)

<100

<100

<100

<100

<100

<100

<100

Zn(ppm)

134

120

88

84

120

124

76

Table 13-8 Esaase Bulk Composites - Multi-element Analysis (ALS A22281) - Part 2

ANALYTE

13D3

13D4

14D1

15D1

15D2

15D3

15D4

Ag(ppm)

0.3

<0.3

0.3

<0.3

0.3

0.3

<0.3

As(ppm)

490

430

945

1075

355

1275

660

Al(%)

8.60

6.96

7.80

6.92

7.96

7.08

7.84

Ba(ppm)

600

400

400

500

500

400

500

Be(ppm)

<5

<5

<5

<5

<5

<5

<5

Bi(ppm)

<10

<10

<10

<10

<10

<10

<10

Ca(%)

0.1

1.1

1.3

1.0

1.0

0.8

0.4

Cd(ppm)

<5

<5

<5

<5

<5

<5

<5

Co(ppm)

45

75

80

90

50

110

75

Cr(ppm)

120

90

100

100

140

120

100

Cu(ppm)

42

30

27

34

33

32

29

Fe(%)

3.26

4.38

4.36

4.34

4.20

4.60

4.46

K(%)

1.80

1.30

1.50

1.47

1.65

1.35

1.56

Li(ppm)

60

50

60

50

55

55

60

Mg(%)

0.48

1.12

1.04

1.12

1.00

1.00

0.92

Mn(ppm)

300

500

900

600

500

500

500

Mo(ppm)

<5

<5

<5

<5

<5

<5

<5

Na(%)

1.06

1.58

1.45

1.55

1.61

1.58

1.29

Ni(ppm)

50

50

55

55

50

55

60

P(ppm)

300

600

500

600

600

600

600

Pb(ppm)

<5

<5

<5

<5

5

5

5

SiO2(%)

64.4

66.0

56.2

63.6

62.0

66.0

64.0

Sr(ppm)

200

200

200

200

240

200

200

Ti(ppm)

4600

3600

3800

3400

4000

3600

4200

V(ppm)

116

86

88

88

104

90

102

Y(ppm)

<100

<100

<100

<100

<100

<100

<100

Zn(ppm)

102

80

82

82

100

88

130



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.2.2.2 Bulk Composites Gravity/CIL Recovery Tests (ALS A22281)

Eight kg of each composite was milled to P80 of 106 µm and passed through a Knelson Concentrator to recover a free gold concentrate. The concentrate was then amalgamated with mercury to remove the free gold particles. The Knelson tail and amalgamation tails were recombined with portions split for gold assay and CIL testing (2 kg scale). Two of the samples had duplicate CIL tests completed for quality control performances.

Table 13-9 Esaase Bulk Composites - Summary of Gravity/CIL Recovery Results

Composite ID

Gravity
Gold
(%)

CIL Unit
Recovery
(%)

Total Gold
Extraction
(%)

Residue
Grade
(Au g/t)

Calculated
Head
(Au g/t)

Assay
Head
(Au g/t)

NaCN
Consumed
(kg/t)

Ca(OH)2
Consumed
(kg/t)

11D1

47.0

52.4

74.8

0.27

1.07

0.79, 0.69

0.35

1.2

11D2

58.1

84.7

93.6

0.08

1.17

0.53, 0.57

0.37

0.7

12ND1
(dup. CIL tests

62.7

74.6

90.5

0.16

1.63

1.26, 1.16

0.20

0.4

62.5

74.8

90.5

0.16

1.64

0.27

0.4

12ND2

32.2

61.4

73.8

0.28

1.07

1.23, 1.13

0.30

0.7

12SD1

68.1

70.1

90.5

0.14

1.47

3.65, 6.25

0.27

0.4

13D1
(dup. CIL tests

54.3

52.8

78.4

0.27

1.23

0.91, 0.77

0.30

0.6

55.1

59.5

81.8

0.22

1.21

0.32

0.5

13D2

39.4

74.6

84.6

0.17

1.11

0.83, 0.84

0.22

0.4

13D3

55.8

87.9

94.6

0.08

1.49

0.97, 2.89

0.25

0.5

13D4

78.8

79.0

95.5

0.21

4.71

2.03, 2.04

0.22

0.4

14D1

46.7

39.3

67.6

0.28

0.85

0.46, 0.47

0.30

0.5

15D1

37.0

66.4

78.9

0.18

0.83

1.26, 0.58

0.20

0.4

15D2

42.6

30.6

60.2

0.21

0.53

0.62, 0.51

0.27

0.5

15D3

66.5

85.4

95.1

0.11

2.14

1.95, 1.48

0.22

0.5

15D4

46.1

78.0

88.2

0.13

1.06

1.26, 1.27

0.27

0.5

13.2.2.3 Bulk Composites Gold by Size Deportment

Each composite was subjected to size-by-size analysis to determine the gold deportment by size fraction. This was carried out on both the CIL feed (gravity tail) and CIL final residues.

As is currently observed in the plant, recovery from Esaase is susceptible to gold losses via lower gold liberation, i.e., the material tested in this program has shown a dependency of gold recovery on grind size.

The average of all CIL feed grades indicated a reduction in grade for both the finer and coarser fractions. This trend was evident in all samples.

The average of all CIL residues, Figure 13-3, shows a linear relationship of higher grades with coarser particle size. Again the trend was observed in all samples.

The reliance of recovery upon liberation is further demonstrated in Figure 13-4 which shows the recovery by individual size fractions. This was calculated based on feed versus tail grades.

Fractions coarser than 75 µm, which accounted for circa 25% of the mass in these tested pulps, show a reduction in recovery.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-3 Esaase Average CIL Residue Grade (g/t) by Size

Figure 13-4 Esaase Average CIL Stage Recovery (%) by Size

13.2.2.4 Leach Residue Diagnostic Analysis - Bulk Composites

In order to assess the deportment of gold lost to residue, a diagnostic analysis was completed on each sample's CIL residue. A four-stage approach was employed in order to determine:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Note, the carbon association stage is by acetonitrile (CH3CN) solvent strip under aggressive conditions. Additional gold that is not carbon associated can also be removed from the solids. The values are somewhat presumptive as a result.

Results as summarized in Table 13-10 indicate that for the seven samples with lowest overall recoveries (<85%), the majority of the unrecovered gold is extracted in the acetonitrile strip i.e. inferred organic carbon association.

Table 13-10 Esaase Bulk Composites - Diagnostic Gold Assays on Final Residues

 

 

 

 

 

Diagnostic Extracted Au Grades (g/t)

Recovery Loss % Points

SAMPLE ID

Total Gold
Extract-ion
%

Residue
Au Grade
(g/t)

Calc. Au
Head
(g/t)

OC Head
%

Extended
CIL*

Ace-
tonitrile
(Carbon
Assoc.)**

Aqua Regia
Soluble
(Sulphide
Assoc.)

Fire
Assay
(SiO
2)

Cal.
Total
Residue
Au (g/t)

OC

AR
Soluble

SiO2

11D1

74.8

0.27

1.07

0.45

0.04

0.17

0.04

0.06

0.27

16.0

3.7

5.6

11D2

93.6

0.08

1.17

0.24

0.06

0.00

0.01

0.01

0.02

1.1

2.7

2.7

12ND1

90.5

0.16

1.63

0.36

0.00

0.11

0.02

0.04

0.17

6.1

1.1

2.3

12ND2

73.8

0.28

1.07

0.42

0.04

0.13

0.06

0.03

0.22

15.7

7.0

3.5

12SD1

90.5

0.14

1.47

0.42

0.00

0.08

0.04

0.02

0.14

5.5

2.7

1.3

13D1

80.1

0.24

1.22

0.42

0.02

0.19

0.04

0.02

0.23

16.6

0.0

1.7

13D2

84.6

0.17

1.11

0.33

0.04

0.09

0.02

0.02

0.13

10.8

2.3

2.3

13D3

94.6

0.08

1.49

0.27

0.00

0.08

0.02

0.01

0.11

3.9

1.0

0.5

13D4

95.5

0.21

4.71

0.24

0.00

0.13

0.02

0.02

0.17

3.4

0.5

0.5

14D1

67.6

0.28

0.85

0.54

0.00

0.25

0.04

0.03

0.32

25.2

4.1

3.1

15D1

78.9

0.18

0.83

0.30

0.00

0.16

0.02

0.03

0.21

16.1

2.0

3.0

15D2

60.2

0.21

0.53

0.42

0.00

0.13

0.04

0.03

0.20

25.6

8.1

6.1

15D3

95.1

0.11

2.14

0.30

0.00

0.06

0.04

0.02

0.12

2.5

1.6

0.8

15D4

88.2

0.13

1.06

0.24

0.00

0.08

0.03

0.02

0.13

7.1

2.8

1.9

Note: * stand-alone test to gauge initial CIL efficiency

        ** less extended CIL g/t

13.2.2.5 Discussion - Bulk Composites Recoveries

Plotting of total recoveries has seemingly indicated two trend relationships:

1. Recovery increase with increasing head grade


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-5 Head Grade vs Total Recovery - Esaase Bulk Composites

Figure 13-6 Head Grade vs Total Recovery, with High Grade Outlier Omitted - Esaase Bulk Composites

Table 13-11 Esaase Bulk Composites - Recoveries at Increasing Cut-off Grades (g/t)

Head Grade (g/t) Base

0.53

0.8

1.0

1.3

No. of composites

14

13

11

5

Average recovery %

83.4

85.2

87.4

93.3

2. The relationship between organic carbon (OC) and CIL gold recovery from gravity tails

Both figures show a strong relationship between OC grade and gold recovery. This relationship can also be highly variable. For example, Figure 13-8 contains four points that highlight the challenges in using OC grades to assess gold recovery performance. Equal OC contents of 0.42% have given a range CIL recoveries from 30 to 70%.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-7 Gold Removed from Final Residue During Acetonitrile Strip vs. OC Content – Esaase Bulk Composites

Figure 13-8 Organic Carbon Grade vs. CIL Stage Recovery - Esaase Bulk Composites

13.2.2.6 Conclusions from Bulk Composites Testing

Comments on the bulk composites' gravity/CIL testwork results are as follows:

The results indicated low recoveries for some composites, attributable to the presence of organic carbon. These findings align with the 2018/19 testwork.

Mapping of the bulk composites' recovery results proved inconclusive as a contributor to recovery modelling. It was decided that greater spatial definition was required in order to create any links between zones/lithologies and recovery expectations, i.e. variability testing.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.2.3 Variability Samples Testing (ALS A22281)

The bulk composites constituents were tested as individual intervals. In some cases, where a lithological boundary was thought to exist, these intervals were further divided. Hole data for these intervals is provided in Table 13-4.

Further refinement of the samples was carried out by removing material that would not be mined as ore, i.e. a 0.5 g/t gold grade cut off was applied and a 1 m 'skin dilution' applied before and after the grade segments. In instances where, for example, an isolated metre increment was of grade yet surrounded by low grade material, it was omitted from the composite. This approach resulted in the removal of 15% of the drill core increments in total.

Head assays were carried out on the main elements of interest and are provided in Table 13-12. No multi element assays were undertaken.

Table 13-13 compares the gold head assays - expected as from the exploration core assays, prepared test samples head assays and those as calculated from the subsequent gravity/CIL recovery tests. Significant scatter of gold grades is again evident.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-12 Esaase Variability Samples Head Assays

Sample ID As
(ppm)
Au
(ppm)
Au_rpt1
(ppm)
Au avg (ppm) Ctotal
(%)
Corganic
(%)
Stotal
(%)
Ssulphide
(%)
11D1-1 1645 3.18 3.51 3.35 1.11 0.45 0.50 0.42
11D1-2 505 0.38 0.42 0.40 0.48 0.45 0.16 0.12
11D2-1 395 0.37 0.46 0.42 0.48 0.27 0.26 0.12
11D2-2 945 0.38 0.29 0.34 1.05 0.33 0.56 0.42
12D1-1 225 0.97 0.97 0.97 0.51 0.51 0.46 0.40
12ND1-2 160 2.41 0.95 1.68 0.42 0.39 <0.02 <0.02
12ND1-3 400 0.92 0.61 0.77 0.66 0.42 0.38 0.36
12ND1-4 1095 0.80 0.62 0.71 0.75 0.30 0.32 0.28
12ND2-1 1180 0.79 0.71 0.75 0.72 0.66 0.54 0.46
12ND2-2 1010 1.66 1.72 1.69 0.96 0.51 0.50 0.44
12ND2-3 405 13.0 0.25 6.63 0.66 0.33 0.24 0.20
12ND2-4 1285 1.12 1.06 1.09 1.17 0.48 0.44 0.38
12SD1-1 735 13.3 14.7 14.00 0.63 0.63 0.24 0.20
12SD1-2 895 0.76 0.47 0.62 0.45 0.42 0.32 0.28
12SD1-3 1440 0.35 0.37 0.36 0.48 0.45 0.22 0.20
12SD1-5 30 <0.02 <0.02 <0.02 0.90 0.15 0.04 0.04
12SD1-5 Repeat <0.02 <0.02 Anomalous – sample not progressed to recovery testing
13D1-1 490 0.80 0.76 0.78 0.48 0.48 0.30 0.28
13D1-2 400 1.08 0.82 0.95 0.57 0.30 0.24 0.22
13D1-3 410 0.42 0.39 0.41 0.78 0.57 0.24 0.22
13D2-2 1125 0.96 0.75 0.86 0.90 0.33 0.42 0.40
13D2-3 345 0.94 0.81 0.88 0.93 0.27 0.30 0.28
13D3-1 795 1.04 1.87 1.46 0.24 0.24 0.14 0.12
13D3-2 325 1.29 1.41 1.35 1.53 0.39 0.26 0.24
13D3-3 530 0.58 0.62 0.60 0.96 0.21 0.22 0.20
13D4-1 515 0.74 1.88 1.31 1.32 0.33 0.36 0.32
13D4-2 545 1.26 1.94 1.60 1.44 0.24 0.28 0.26
14D1-2-1 1085 0.53 0.77 0.65 2.13 0.51 0.40 0.38
14D1-2-2 140 0.73 0.77 0.75 1.71 0.33 0.32 0.28
15D1-2 715 0.70 0.86 0.78 1.53 0.27 0.30 0.20
15D1-3 1015 1.37 1.35 1.36 1.62 0.36 0.44 0.32
15D1-4 1100 3.58 16.9 10.24 1.05 0.21 0.26 0.18
15D2-1 525 0.59 0.66 0.63 1.41 0.54 0.24 0.22
15D2-2-1 160 0.52 0.61 0.57 1.44 0.21 0.20 0.18
15D2-2-2 630 2.72 3.47 3.10 1.29 0.21 0.28 0.26
15D2-3 260 0.23 0.27 0.25 1.32 0.36 0.12 0.10
15D3-1 490 0.76 0.73 0.75 1.35 0.21 0.26 0.24
15D3-2 2810 3.36 2.50 2.93 1.35 0.33 0.42 0.40
15D3-3 715 0.81 0.81 0.81 0.93 0.39 0.40 0.32
15D3-4 215 0.83 1.89 1.36 1.29 0.30 0.20 0.20
15D4-1 575 1.93 1.75 1.84 0.84 0.12 0.28 0.26
15D4-2 585 0.84 0.91 0.88 1.02 0.33 0.30 0.28
15D4-3 1125 0.79 0.90 0.85 0.96 0.30 0.30 0.28


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-13 Esaase Variability Samples - Comparison of Gold Head Assays (g/t)

Sample ID Expected
(Core Grades)
ALS Duplicate
Fire Assay
Fire Assay
Average
ALS Calc. Hea
from 8 kg
Recovery Test
% Difference
(Expected vs
Calc.)
11D1-1 6.49 3.18, 3.51 3.35 3.50 46
11D1-2 1.13 0.38, 0.42 0.40 0.78 31
11D2-1 0.86 0.37, 0.46 0.42 1.47 -71
11D2-2 1.67 0.38, 0.29 0.34 0.41 75
12ND1-1 0.94 0.97, 0.97 0.97 1.29 -36
12ND1-2 2.39 2.41, 0.95 1.68 1.29 46
12ND1-3 5.09 0.92, 0.61 0.77 1.15 77
12ND1-4 1.26 0.80, 0.62 0.71 1.90 -51
12ND2-1 1.04 0.79, 0.71 0.75 0.80 23
12ND2-2 1.52 1.66, 1.72 1.69 1.61 -6
12ND2-3 1.42 13.0, 0.25 6.63 0.56 61
12ND2-4 1.54 1.12, 1.06 1.09 1.18 23
12SD1-1 1.02 13.3, 14.7 14.0 (excl.) 1.30 -27
12SD1-2 0.48 0.76, 0.47 0.62 0.69 -43
12SD1-3 0.62 0.35, 0.37 0.36 0.45 28
13D1-1 0.96 0.76, 0.78 0.78 0.97 -1
13D1-2 2.20 1.08, 0.82 0.95 12.0 (excl.) -443
13D1-3 0.98 0.42, 0.39 0.41 1.12 -15
13D2-2 0.92 0.96, 0.75 0.86 0.87 5
13D2-3 1.76 0.94, 0.81 0.88 1.03 41
13D3-1 2.33 1.04, 1.87 1.46 1.99 15
13D3-2 1.61 1.29, 1.41 1.35 1.07 34
13D3-3 1.37 0.58, 0.62 0.60 1.28 7
13D4-1 1.80 0.74, 1.88 1.31 1.04 42
13D4-2 4.38 1.26, 1.94 1.60 3.36 23
14D1-2-1 1.18 0.53, 0.77 0.65 0.66 44
14D1-2-2 1.00 0.73, 0.77 0.75 1.05 -5
15D1-2 0.90 0.70, 0.86 0.78 1.22 -36
15D1-3 0.97 1.37, 1.35 1.36 1.70 -75
15D1-4 2.09 3.58, 16.9 10.2 3.78 -81
15D2-1 0.85 0.59, 0.66 0.63 0.72 15
15D2-2-1 0.75 0.52, 0.61 0.57 1.23 -62
15D2-2-2 1.00 2.72, 3.47 3.10 3.38 -237
15D2-3 1.81 0.23, 0.27 0.25 (excl.) 0.20 (excl.) 89
15D3-1 1.76 0.76, 0.73 0.75 1.21 32
15D3-2 1.60 3.36, 2.50 2.93 6.56 -310
15D3-3 1.63 0.81, 0.81 0.81 1.63 0
15D3-4 2.11 0.83, 1.89 1.36 1.01 52
15D4-1 1.11 1.93, 1.75 1.84 1.10 1
15D4-2 1.29 0.84, 0.91 0.88 1.48 -15
15D4-3 1.74 0.79, 0.90 0.85 0.73 58
average 1.65   1.47 1.50 -7

 


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.2.3.1 Variability Samples – Recovery Testing

Samples were subjected to gravity/CIL testing as per the bulk composites, with the exception of the kinetics sampling. Only final 24-hour products were assayed. For this suite of tests, it was decided to assess the effect of increased NaCN levels, an initial concentration of 1,000 ppm was employed. Activated carbon concentration was 15 g/L.

Table 13-14 Esaase Variability Samples Recovery Test Results

Sample ID

Gravity Gold
(%)

CIL Unit
Recovery%

Total Gold
Extraction %

Residue
Grade (Au g/t)

Calculated
Head (Au g/t)

NaCN
Cons. (kg/t)

Ca(OH)2 Cons.
(kg/t)

11D1 – 1

53.0

87.2

94.0

0.21

3.50

0.39

0.4

11D1 – 2

56.7

55.8

80.9

0.15

0.78

0.50

1.2

11D2 – 1

66.7

89.8

96.6

0.05

1.47

0.42

0.4

11D2 – 2

31.8

89.4

92.7

0.03

0.41

0.45

1.0

12ND1-1

66.8

88.3

96.1

0.05

1.29

0.31

0.4

12ND1-2

63.9

80.7

93.0

0.09

1.29

0.36

0.4

12ND1-3

49.7

86.2

93.1

0.08

1.15

0.31

0.4

12ND1-4

51.5

81.5

91.0

0.17

1.90

0.26

0.3

12ND2-1

27.7

86.2

90.0

0.08

0.80

0.47

0.7

12ND2-2

16.7

81.4

84.5

0.25

1.61

0.42

0.9

12ND2-3

55.4

75.9

89.3

0.06

0.56

0.31

0.5

12ND2-4

35.3

81.7

88.2

0.14

1.18

0.42

0.5

12SD1-1

47.3

82.4

90.8

0.12

1.30

0.44

0.4

12SD1-2

36.5

86.2

91.3

0.06

0.69

0.50

0.5

12SD1-3

37.2

89.4

93.3

0.03

0.45

0.39

0.4

13D1-1

37.5

74.4

84.0

0.16

0.97

0.42

0.5

13D1-2

92.4

89.0

99.2

0.10

12.0

0.45

0.4

13D1-3

44.2

80.0

88.9

0.13

1.12

0.47

0.5

13D2-2

19.8

80.7

84.5

0.14

0.87

0.34

0.3

13D2-3

33.5

81.8

87.9

0.13

1.03

0.31

0.3

13D3-1

65.6

91.9

97.2

0.06

1.99

0.31

0.4

13D3-2

26.7

87.9

91.1

0.10

1.07

0.31

0.3

13D3-3

55.2

87.0

94.2

0.08

1.28

0.34

0.5

13D4-1

25.9

86.4

89.9

0.11

1.04

0.31

0.3

13D4-2

47.9

92.8

96.3

0.13

3.36

0.40

0.3

14D1-2-1

21.6

72.9

78.8

0.14

0.66

0.45

0.5

14D1-2- 2

44.0

74.5

85.7

0.15

1.05

0.34

0.5

15D1-2

36.1

80.7

87.7

0.15

1.22

0.29

0.3

15D1-3

23.7

91.5

93.5

0.11

1.70

0.31

0.3

15D1-4

90.4

87.6

98.8

0.05

3.78

0.31

0.3

15D2-1

28.1

60.5

71.6

0.21

0.72

0.40

0.6

15D2-2-1

41.4

87.5

92.7

0.09

1.23

0.36

0.3

15D2-2-2

77.3

65.5

92.2

0.27

3.38

0.36

0.3

15D2-3

31.1

49.0

64.9

0.07

0.20

0.36

0.3

15D3-1

55.9

83.1

92.5

0.09

1.21

0.36

0.4

15D3-2

76.9

86.5

96.9

0.21

6.56

0.40

0.3

15D3-3

61.2

89.7

96.0

0.07

1.63

0.45

0.4

15D3-4

49.1

85.5

92.6

0.08

1.01

0.36

0.3

15D4-1

42.7

79.5

88.2

0.13

1.10

0.34

0.3

15D4-2

46.7

87.3

93.3

0.10

1.48

0.40

0.4

15D4-3

28.2

84.6

89.0

0.08

0.73

0.52

0.4

Comments on the variability composites' gravity/CIL testwork results are as follows:


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The two samples that returned the extremes of calculated head values have not been included in the further results assessment:

13.2.3.2 Comparison with Bulk Composites Recoveries

Table 13-15 shows the bulk composites recoveries as quoted in Section 13.2.2 along with the corresponding recoveries as determined from the variability samples results.

Variability results show the average of the intervals that comprised the bulk composites, on a weighted basis.

Table 13-15 Comparison of Esaase Bulk Composites Recoveries to Corresponding Constituents

Bulk Composite ID

Bulk Composite Total
Recovery %

Corresponding Variability
Samples Recovery %

Increase, Percentage
Points

11D1

74.8

87.2

12.4

11D2

93.6

94.4

0.9

12ND1

90.5

93.3

2.7

12ND2

73.8

87.6

13.8

12SD1

90.5

92.1

1.6

13D1

80.1

90.5

10.4

13D2

84.6

86.3

1.7

13D3

94.6

95.2

0.6

13D4

95.5

94.0

-1.5

14D1

67.6

81.3

13.7

15D1

78.9

93.6

14.8

15D2

60.2

83.7

23.5

15D3

95.1

95.0

-0.1

15D4

88.2

90.9

2.8

Average

83.4

90.4

6.9

Shown graphically in Figure 13-9, significant increases are seen for the composites that returned the lower results in the bulk composite round of testing. It should be noted that, although the bulk and variability rounds of testing are not directly comparable due to the removal of low grade drill core increments, the recovery increases are attributed to the higher initial NaCN concentrations in the laboratory tests.

It should be noted however that, although laboratory batch tests require higher initial cyanide concentrations, further investigation is required into continuous plant requirements. Significantly higher cyanide additions than current levels (circa 640 ppm) may have implications for detoxification and tailings management.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-9 Esaase Bulk Composite vs. Constituents' Recoveries

The variability samples in some instances returned calculated gold head grades lower than 1.0 g/t. Table 13-16 shows the recoveries from two additional grade ranges.

It is evident however that the average head grade as calculated from all samples more closely aligns with that of the overall pit, the corresponding recovery value is deemed more appropriate on that basis.

Table 13-16 Esaase Recoveries Cropped According to Calculated Gold Head Assays

 

 

Esaase Variability Intervals (all)*

Intervals at Head Grade >0.8g/t Au

Intervals at Head Grade >1.0g/t Au

count

39

31

28

average head Au g/t

1.50

1.73

1.82

total recovery %

90.5

91.7

92.2

recovery discount %**

0.3

0.3

0.3

estimated recovery %

90.2

91.4

91.9

Notes: * Excludes highest and lowest outliers according to calculated head gold grades

          ** 0.3 % points as based on 6 months' process plant operating data April to Sept. 2021:

          - 0.007 mg/L final tails' solution tenor

          - 76 g/t barren carbon grade, 5 T/month carbon loss

13.2.3.3 Commentary on Recovery Results of the Variability Samples in Relation to Geology

Direct correlation between the metallurgical recovery of individual samples and current Esaase geological model cannot be established either spatially or statistically (Table 13-17, Figure 13-10).

It becomes clear since the receipt of the test results in early October 2021, that the geometallurgical understanding will need to be improved. At time of this report, Asanko Exploration team has started a new drillhole re-logging and geological mapping campaign to advance the interpretation and modelling of the geology at Esaase.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-17 Esaase Recovery by Domain

Litho-Stratigraphic Unit

 

Average Recovery (%)

Sum of Sample Length (m)

Central SS S.Main

88.7

275

Central SS Main

92.4

458

Central SS North

92.2

23

Cobra S.Main

78.8

4

Cobra Main

89.7

157

Upper SS Main

91.3

16

Figure 13-10 Esaase Gold Recovery by Mineralized Domain

13.3 Current Testwork 2021 - Nkran and Obotan Satellite Deposits

13.3.1 Nkran 2021 Testwork (ALS A22441)

Past gold recoveries from processing of the Nkran ore (2017 to 2019) averaged 94%. By way of confirmation testing, a suite of 7 DD (half HQ) intervals were dispatched to ALS, Perth (Report A22441, January 2022). Lithologies tested included granites (2), sandstones (4) and siltstone (1).

Figure 13-11 provides the sample locations. The average interval length of each composite was 19 m.

Table 13-18 provides the composites' hole details while Table 13-19 provides the head assays for the main elements of interest.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-11 Nkran Composite Long Section

Table 13-18 Nkran Composites Details

Composite ID

Hole ID

Lithology

From m

To m

NKGR02

NKDD20-018

granite

13

57

NKGR05

NKDD20-031

granite

127

155

NKSD11

NKDD20-039

sandstone

92.25

117

NKSD12

NKDD20-024

sandstone

87.1

111

NKSD15

NKDD20-047

sandstone

107

121.5

NKSD16

NKDD20-024

sandstone

111

136

NKSI14

NKDD20-031

siltstone

75.2

88.14

Table 13-19 Nkran Composites Head Assays

COMP ID Ag
(ppm)
As
(%)
Au I
(ppm)
Au II
(ppm)
CTotal (%) OC (%) Cu
(ppm)
STotal (%) SSulphide
(%)
NKGR02 0.3 0.22 0.25 0.24 0.39 <0.03 28 0.24 0.16
NKGR05 0.3 0.34 0.36 0.29 0.69 0.12 39 0.46 0.32
NKSD11 0.3 0.30 2.03 2.36 0.72 <0.03 57 1.00 0.76
NKSD12 <0.3 0.06 0.47 0.59 1.68 0.03 30 0.30 0.24
NKSD15 0.3 0.20 1.29 0.92 1.11 0.42 54 0.58 0.48
NKSD16 0.3 0.36 5.61 1.96 1.53 0.09 34 0.60 0.40
NKSI14 <0.3 0.12 1.22 1.46 1.47 0.30 40 0.64 0.54


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The first round of recovery tests was completed at an incorrect cyanide concentration of an initial 300 ppm NaCN. Results indicated poor response for both the granite samples. Subsequent testing at a more appropriate concentration of 600 ppm NaCN (equivalent to typical plant levels) resulted in high recoveries for all lithologies. These results are summarized in Table 13-20. Note, the two granites samples were composites for the second round of testing.

Table 13-20 Nkran Summary of Recoveries (600 ppm Initial NaCN)

COMP ID

GRIND
SIZE
(P80 um)

GRAVITY
GOLD (%)

TOTAL GOLD
EXTRACTION
24Hrs (%)

RESIDUE
GRADE
(Au g/t)

CALC.
HEAD
(Au g/t)

NaCN
(kg/t)

HYD. LIME
(kg/t)

NKGR02/05

106

50.1

96.2

0.03

0.66

0.21

0.27

NKSD11

106

24.3

95.5

0.13

2.86

0.27

0.51

NKSD12

106

10.4

95.9

0.03

0.73

0.25

0.48

NKSD15

106

8.8

94.2

0.11

1.80

0.27

0.48

NKSD16

106

10.5

96.0

0.13

3.11

0.25

0.42

NKSI14

106

9.7

93.1

0.11

1.60

0.25

0.52

The simple average recovery from these tests was 95.3%, assuming equal recovery for the granite samples. Allowing a 0.3% discount for operational losses, the resultant 95% recovery suggests the past processing results (94%) may be applied for Nkran material processing.

Note that Nkran is currently the subject of an infill drilling campaign, resultant mineralized core sections are to be subjected to further confirmatory testwork.

13.3.2 Abore 2021 Testwork (ALS A22441)

A suite of metallurgical testwork was undertaken on 7 DD core composites at ALS, Perth (Report A22441, January, 2022). The objective was to confirm that recoveries would align with those of past performance. Resolute mining and processing activities in 2002 returned overall recoveries of 95% (refer Resolute Amansie Limited: Abore Open Pit - Final Report, 2002).

A total of 124 m core was dispatched, with each interval composite averaging 18 m in length. Six of the composites were classified as granite while the seventh as a blend of granites (27%) and sandstones (73%). Granites constitute an estimated 85% of the Abore fresh zone tonnage. Figure 13-12 displays the composites' locations in long section.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-12 Abore Composites Long Section

Table 13-21 supplies a summary of the interval composites hole details. Note, intervals' meters were not necessarily continuous as some core increments were unavailable.

Table 13-22 provides the composites head assays.

Table 13-21 Abore Composites Details

Composite ID

Hole ID

Lithology

From m

To m

ABRGR01

ABPC20-003

granite

103

132

ABRGR02

ABPC20-007

granite

100

144

ABRGR03

ABPC20-009

granite

177

193

ABRGR04

ABPC20-030

granite

113

129

ABRGR05

ABPC20-020

granite

110

144

ABRGR07

ABPC20-006

granite

113

154

ABRSD08

ABPC20-013

sediments/granite

126.19

130.46

ABPC20-024

119

126



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-22 Abore Composite Head Assays

COMP ID Ag
(ppm)
As
(%)
Au I
(ppm)
Au II
(ppm)
CTotal
(%)
OC (%) Cu
(ppm)
STotal (%) SSulphide (%)
ABRGR01 <0.3 0.26 0.31 0.46 0.42 <0.03 5 0.18 0.14
ABRGR02 <0.3 0.34 0.71 0.52 0.45 <0.03 4 0.22 0.14
ABRGR03 <0.3 0.48 1.56 0.80 0.57 <0.03 5 0.28 0.22
ABRGR04 0.3 0.48 0.52 1.01 0.39 <0.03 5 0.26 0.18
ABRGR05 <0.3 0.20 0.29 1.70 0.33 0.18 12 0.14 0.10
ABRGR07 <0.3 0.12 0.16 0.76 0.30 0.12 5 0.12 0.06
ABRGR08 0.3 0.16 1.51 1.53 0.75 0.27 39 0.44 0.42

Summarized recovery results in Table 13-23 indicate good response from the granite samples with an average of 95.7%. The sandstone/granite sample returned lower recovery at 84.5% and also indicated the lowest gravity stage recovery of only 18.3%. This sample contained the highest OC grade at 0.27%.

By calculation of proportion of sandstone to granite in composite ABRSD08, and the average granite recovery, the estimated recovery from the sandstone component is 80.3%.

Table 13-23 Abore Summary of Recoveries

COMP ID

GRIND
SIZE (P80
um)

GRAVITY
GOLD
(%)

TOTAL GOLD
EXTRACTION
24Hrs (%)

RESIDUE
GRADE
(Au g/t)

CALC.
HEAD
(Au g/t)

NaCN
(kg/t)

HYD.
LIME
(kg/t)

ABRGR01

106

49.0

93.2

0.05

0.66

0.26

0.3

ABRGR02

106

51.5

94.6

0.05

0.84

0.25

0.3

ABRGR03

106

69.5

96.9

0.05

1.63

0.25

0.3

ABRGR04

106

27.5

97.9

0.06

2.57

0.22

0.3

ABRGR05

106

41.1

94.7

0.03

0.48

0.20

0.3

ABRGR07

106

46.8

96.6

0.01

0.29

0.17

0.2

ABRSD08

106

18.3

84.5

0.23

1.50

0.25

0.5

The overall recovery from these tests stands at 93.3% which includes a discount for losses in processing. When using higher recoveries for the remaining oxide and transition materials, the work confirms no major variation from the past production 95% recovery value, however a 94% recovery value is currently concluded for the overall Abore recovery.

The relationship between OC and gold recovery in the sandstones warrants further investigation. Additional diamond drilling at Abore is currently envisaged, gold recovery relationship with OC will constitute part of the ensuing metallurgical test program.

13.3.3 Miradani North 2021 Testwork (ALS A22441)

A total of 259 x 1m core samples from 11 drill holes were delivered to ALS, Perth in June of 2021.

The drill hole locations are displayed in long section in Figure 13-13.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-13 Miradani North Drill Holes Long Section

Table 13-24 provides the head assays for the main elements of interest. The samples representing each oxidation state of fresh, transition and oxide were combined on an equal weight basis and subjected to multi element analysis as per Table 13-25.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-24 Miradani North Head Assays

Sample ID

Ag
(ppm)

As
(%)

Au
(ppm)

Au_rpt1

Au ave
(ppm)

Ctotal 
(%)

Corganic
(%)

Cu
(ppm)

Stotal
(%)

Ssulphide (%)

OX 1

14.1

0.12

0.59

0.37

0.48

0.21

0.18

47

<0.02

NA

OX 2

0.9

0.14

0.45

0.49

0.47

0.15

0.12

36

<0.02

NA

TX 1

0.6

0.32

0.55

0.39

0.47

0.39

0.30

55

0.42

0.34

TX 2

0.3

0.38

1.03

1.07

1.05

0.30

0.27

44

0.34

0.26

FR 1

0.3

1.00

1.05

1.23

1.14

0.66

0.18

42

0.88

0.76

FR 2

<0.3

0.74

6.86

0.71

3.79

0.72

0.18

28

0.58

0.40

FR 3

0.3

0.14

0.54

1.18

0.86

0.60

0.45

49

0.34

0.24

FR 4

0.6

1.30

1.88

1.29

1.59

0.60

0.27

40

1.00

0.84

FR 5

<0.3

0.80

0.91

1.91

1.41

0.54

0.15

31

0.78

0.64

FR 6

0.6

1.80

1.94

2.22

2.08

0.66

0.21

37

1.30

1.22

FR 7

<0.3

1.20

1.49

0.77

1.13

0.24

0.18

33

0.76

0.64

FR 8

0.6

0.38

1.06

1.65

1.36

0.51

0.33

32

0.60

0.48

FR 9

<0.3

0.34

0.22

0.17

0.20

0.15

0.12

4

0.22

0.14

FR 10

0.3

0.94

1.77

1.66

1.72

0.36

0.24

12

0.64

0.58

FR 11

<0.3

0.90

0.53

0.70

0.62

0.21

0.18

38

0.76

0.62

FR 12

<0.3

1.76

1.61

1.19

1.40

0.60

0.57

36

1.26

1.24

FR 13

<0.3

0.90

0.48

0.76

0.62

0.42

0.27

44

0.84

0.60

FR 14

<0.3

0.36

0.71

0.76

0.74

0.18

0.09

40

0.42

0.26

Table 13-25 Miradani North Multi Element Analyses - Oxidation State Composites

ANALYTE

OXIDE

TRANS

FRESH

Ag(ppm)

<2

<2

<2

Al(%)

7.96

7.84

7.32

As(ppm)

1310

4190

8590

As(ppm)

1200

3800

8800

Ba(ppm)

450

460

520

Be(ppm)

<5

<5

<5

Bi(ppm)

<10

<10

<10

CTotal(%)

0.15

0.30

0.48

COrganic(%)

0.15

0.24

0.21

Ca(ppm)

200

300

6600

Cd(ppm)

<5

<5

<5

Co(ppm)

10

30

20

Cr(ppm)

130

130

110

Cu(ppm)

32

46

34

Fe(%)

3.70

4.54

3.98

Hg(ppm)

0.2

<0.1

0.2

K(%)

1.36

1.81

1.84

Li(ppm)

20

45

45

Mg(%)

0.24

1.08

1.04

Mn(ppm)

320

340

465

Mo(ppm)

5

<5

10

Na(%)

0.08

1.87

2.21



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


ANALYTE

OXIDE

TRANS

FRESH

Ni(ppm)

20

50

45

P(ppm)

200

500

600

Pb(ppm)

195

55

60

STotal(%)

<0.02

0.36

0.74

SSulphide(%)

NA

0.30

0.62

SiO2(%)

71.2

68.4

66.0

Sr(ppm)

40

64

202

Ti(ppm)

4600

4000

3600

U(ppm)

<2

<2

<2

V(ppm)

92

112

84

Y(ppm)

<100

<100

<100

Zn(ppm)

36

82

70

Each of the 16 samples was subjected to recovery testing via gravity concentration and CIL of the gravity tails. These tests were carried out at a P80 of 106 µm grind size and 600 ppm initial NaCN in CIL.

Results as summarized in Table 13-26, indicate high gold recovery response with the following simple average recoveries by oxidation state:

Table 13-26 Miradani North Recovery Testing - Summarised Results

SAMPLE ID

GRAVITY
GOLD (%)

TOTAL GOLD
EXTRACTION
24 Hrs (%)

RESIDUE
GRADE
(Au g/t)

ASSAY
HEAD
(Au g/t)

CALC.
HEAD (Au
g/t)

NaCN
(kg/t)

HYD. LIME
(kg/t)

OX1

54.4

97.7

0.02

0.59, 0.37

0.88

0.38

1.8

OX2

54.1

96.7

0.03

0.45, 0.49

0.75

0.37

1.4

TX1

36.3

93.6

0.05

0.55, 0.39

0.79

0.66

2.2

TX2

32.9

94.3

0.05

1.03, 1.07

0.88

0.78

2.8

FR1

43.8

95.2

0.08

1.05, 1.23

1.58

0.27

0.5

FR2

69.4

97.1

0.07

6.86, 0.71

2.25

0.22

0.5

FR3

59.7

96.0

0.04

0.54, 1.18

0.94

0.32

0.5

FR4

62.8

97.6

0.09

1.88, 1.29

3.51

0.25

0.4

FR5

68.0

95.6

0.10

0.91, 1.91

2.25

0.25

0.4

FR6

48.1

93.5

0.22

1.94, 2.22

3.29

0.25

0.4

FR7

57.9

93.9

0.06

1.49, 0.77

0.98

0.27

0.5

FR8

48.5

93.8

0.13

1.06, 1.65

2.01

0.37

0.7

FR9

37.7

88.2

0.03

0.22, 0.17

0.25

0.27

0.3

FR10

40.3

92.4

0.21

1.77, 1.66

2.77

0.20

0.5

FR11

50.4

92.7

0.06

0.53, 0.7

0.82

0.84

6.0

FR12

53.9

94.4

0.15

1.61, 1.19

2.60

1.24

9.3

FR13

42.8

87.7

0.14

0.48, 0.76

1.14

0.84

5.5

FR14

43.1

90.1

0.07

0.71, 0.76

0.70

0.30

1.0

An overall value of 94% recovery value is concluded for the Miradani North material.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.3.4 Akwasiso

Akwasiso mineralization is hosted in shears on siltstone/sandstone contacts, and around and within the granitic intrusive. Strong alteration zones are associated with higher grades around the sandstone-granite contact. Mineralisation is hosted in the sandstone unit with gold occurring within quartz-carbonate veins, similar to the other deposits in the belt.

Akwasiso is currently being fed to the process plant as a minor tonnage contributor along with the predominant Esaase mill feed. Pit depletion is estimated to occur mid-2022.

A 94% gold recovery value is attributed to this small satellite deposit.

13.3.5 Dynamite Hill Previous Recoveries

Dynamite Hill ore had been processed through the process plant for 22 months between November 2017 and August 2019. This was complementary to the main mill feed sourced from the Nkran pit and was at no stage processed in isolation.

Table 13-27 provides details the contribution tonnage of Dynamite Hill (average 18%) along with overall plant recoveries (average 94%).

Table 13-27 Dynamite Hill Mill Feed Component and Plant Recoveries

Month

Total Tonnes
Treated (t)

Dynamite Hill
Tonnes (%)

CIL Recovery (%)

Overall Plant
Recovery (%)

Nov-17

348,027

2.1

87.3

94.4

Dec-17

420,549

3.5

88.5

93.4

Jan-18

430,286

5.5

87.4

92.9

Feb-18

406,787

15.8

88.6

93.5

Mar-18

432,410

22.4

88.9

93.4

Apr-18

438,816

16.7

88.7

93.7

May-18

455,476

20.7

89.0

93.7

Jun-18

479,361

16.8

89.0

93.6

Jul-18

438,938

20.4

87.4

93.2

Aug-18

444,536

19.2

89.6

93.9

Sep-18

415,351

18.3

88.9

94.0

Oct-18

434,117

21.0

89.8

94.7

Nov-18

427,384

19.0

89.3

93.6

Dec-18

376,102

5.2

90.3

95.3

Jan-19

340,030

15.1

88.1

93.5

Feb-19

494,877

16.6

87.1

93.1

Mar-19

388,745

19.5

87.9

93.1

Apr-19

458,077

37.9

87.2

92.3

May-19

471,325

35.9

88.1

93.3

Jun-19

445,122

32.4

89.3

94.2

Jul-19

508,428

23.5

88.7

94.5

Aug-19

501,956

13.7

87.5

94.1

Given the Dynamite Hill ore was always fed in combination with Nkran ore, Figure 13-14 graphically displays variation in overall plant recoveries in comparison to the Dynamite Hill tonnage contribution.

Evident is an essentially steady rate of recovery over the period regardless of the Dynamite Hill component. The attributable recovery from future mill feed is therefore assumed to be in line with past production 94% recovery.


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 13-14 Plant Recovery versus Dynamite Hill Feed Component

13.3.6 Adubiaso Previous Recoveries

Adubiaso ore had been mined and processed through the process plant for a period of 14 months from November 1999 to December 2000. The ore was complimentary mill feed to that of Nkran ore, over the period Adubiaso ore accounted for an average of 34% of the mill feed tonnage.

Table 13-28 provides a summary of the processing results, a total of 698 kt was fed to the mill with gold recoveries were slightly greater than 96% as based on monthly plant recovery figures (refer Resolute Amansie Limited: Adubiaso Open Pit - Final Report, 2001).

A slightly conservative gold recovery of 94% has been applied for future performance from this pit.

Table 13-28 Adubiaso Past Production Summary

Period

Tonnes (dmt)

Grade (g/t Au)

Mined Au Oz

Recovered Au Oz

Nov-99

64,267

1.42

2,940

2,782

Dec-99

46,481

1.59

2,387

2,256

Jan-00

47,810

1.82

2,810

2,681

Feb-00

82,888

1.95

5,218

4,989

Mar-00

91,460

3.11

9,178

8,921

Apr-00

65,130

3.09

6,490

6,334

May-00

104,422

2.54

8,561

8,296

Jun-00

88,750

3.14

8,990

8,775

Jul-00

34,812

2.35

2,641

2,564

Aug-00

15,591

2.55

1,283

1,249

Sep-00

12,706

2.45

1,003

970

Oct-00

21,285

2.54

1,742

1,620

Nov-00

6,100

2.12

417

381

Dec-00

16,946

1.82

994

862

Total

698,648

2.43

54,654

52,677



 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

13.4 Recent Plant Performance

As per the press release issued by Galiano Gold on February 25th, 2022, the Asanko Gold Mine had recently detected an increase in gold grades in its tailings product leaving the processing facility. The assays indicated total gold grades of approximately 0.40 g/t in tailings product, which is higher than the historic and expected total gold grade in tailings of approximately 0.10 g/t. Previous testwork describes areas of the Esaase pit that were expected to yield lower recovery, and it is possible that material mined from these areas may be causing the lower recovery. However, given the volume and consistency of the material yielding lower recovery, the Company is working to better understand the cause(s), magnitude and impact of the observed lower recovery.

Testwork programs (2018-2021) have identified the key component of the geometallurgy of the Esaase unoxidized fresh mineralization, and potentially within the weakly oxidised transition, as the distribution and abundance of organic carbon.

Organic carbon in the plant feed material can compete with the activated carbon, added as part of the recovery process, for the adsorption of solubilised gold from solution.

An initial full plant circuit survey was recently completed. Samples obtained from various parts of the plant were subject to both BLEG (Bulk Leach Extractable Gold) and fire assays to assess how the characteristics of cyanide-soluble gold changes throughout the plant in comparison to total gold. Early results indicated that a portion of the increase in gold in tailings is attributable to preg-borrowing or preg-robbing materials, evident by an increase in difference between BLEG and fire assay after reaction with cyanide in the first leach tank,

Initial diagnostic leach testwork of head and tail composite samples indicate that the lower recoveries appear to be losses to organic carbon and some encapsulation in sulphides and silicates. The magnitude of recovery loss attributable to organic carbon versus sulphides/silicates is currently inconclusive and will continue to be investigated.

Investigative testing of recent leach feed material, undertaken at the Asanko site laboratory, has indicated the potential for increased recoveries via the use of kerosene as a pre-CIL conditioning agent. The kerosene serves to foul the activity of the organic carbon component of the feed material, thereby retarding any subsequent gold losses due to preg-borrowing or preg-robbing.

13.5 Life of Mine Recovery Estimates

13.5.1 Esaase

The 2021 testing (ALS report A22281) returned recovery results for the bulk composites that align with those from the 2018/19 testwork programs. As such, no change has been made to the recovery estimates as per the Asanko Gold NI 43-101 Technical Report (2020) for the purpose of constraining the current Mineral Resource estimate. These recoveries, based on material source/type, are calculated according to the equations in Table 13-29.

Although the variability composites testing completed in 2021 (A22281) indicated an upside to these recovery estimates, the results are not applied herein. The rationale behind deferring reliance on the higher recoveries obtained in the testing is twofold:

1. Current plant performance is yielding lower recoveries than previously modelled in equivalent spatial locations within the Esaase deposit. The deviation between actual plant performance and modelled recovery will need to be further examined to determine the cause and the extent to which this may persist within the deposit

2. The variability testing, although indicative of an upside to 90.1% average recovery, may require revised plant operating protocols


 

NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 13-29 Esaase Head Grade Recovery Model Correlations

Material Source

Head Grade Recovery
Correlation

M (slope)

C (coefficient)

Upper (Fresh/Trans)

y = 9.600ln(x) + 82.260

9.60

82.26

Cobra (Fresh/Trans)

y = 15.532ln(x) + 56.020

15.5

56.02

Central (Fresh/Trans)

y = 6.202ln(x) + 85.792

6.20

85.79

Python (Fresh/Trans)

=upper

9.60

82.26

Other (Fresh/Trans)

=upper

9.60

82.26

Material Type

Residue Value Au (g/t)

Esaase Oxides*

0.10

Recovery Discount Factor (due to Soluble Gold Losses & Carbon Losses)

0.5%

Note: * A fixed residue grade has been applied to the Esaase Oxide material

13.5.2 Nkran and Obotan Satellite Pits

Gold recoveries used for Nkran and the minor satellite pits is 94% based on previous operational performance and recoveries achieved in the mill from 2017 to 2019.

Additional metallurgical testing on Abore and Nkran confirmed the assumed recoveries as valid. Miradani North recovery is also estimated at 94%, as based on the 2021 recovery testwork.

Akwasiso material is currently being fed to the process plant as a minor tonnage contributor along with the predominant Esaase mill feed. Pit depletion is estimated to occur mid-2022.

Dynamite Hill and Adubiaso recoveries are assumed to be aligned with past production recoveries from the prior Resolute Amansie Limited operations.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14 MINERAL RESOURCE ESTIMATES

The effective date of the Mineral Resource is February 28, 2022, and comprises eight deposits, which have been combined into a total Mineral Resource table (Table 14-1).

Table 14-1 Summary of Mineral Resources at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

 

Measured

Indicated

Measured + Indicated

Inferred

 

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Tonnes

Grade

Au
Contained

Deposit

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

(Mt)

(g/t)

(koz)

Nkran

 

 

 

12.1

2.09

814

12.1

2.09

814

1.3

2.23

96

Esaase

10.9

1.25

437

11.7

1.27

475

22.6

1.26

912

0.6

1.22

25

Akwasiso

 

 

 

1.7

1.31

69

1.7

1.31

69

0.2

1.46

7

Abore

3.2

1.46

150

5.1

1.23

203

8.3

1.32

353

1.1

1.55

55

Adubiaso

 

 

 

1.6

1.80

90

1.6

1.80

90

0.2

1.38

9

Asuadai

 

 

 

1.6

1.29

67

1.6

1.29

67

0.0

1.17

1

Miradani

 

 

 

7.1

1.28

293

7.1

1.28

293

2.6

1.21

102

Dynamite

 

 

 

1.9

1.39

85

1.9

1.39

85

0.3

1.26

14

Stockpiles

9.5

0.72

221

 

 

 

9.5

0.72

221

 

 

 

Total

23.6

1.06

808

42.7

1.53

2,096

66.4

1.36

2,904

6.4

1.49

309

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion up to and including February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software at gold price of $1,600/oz. Mining, G&A, processing costs, and process recovery are dependent on deposit and detailed in the respective deposit sections.

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

Cautionary Note about Mineral Resources

Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. Mineral Resources do not account for mining loss and dilution. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to the Indicated category through further exploration.

All Mineral Resources reported are constrained by a US$1600/oz gold pit shell and as such, are considered to have a reasonable prospect for eventual economic extraction.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.1 Esaase Mineral Resource Estimate

All figures and tables prepared by Galliano unless otherwise indicated.

14.1.1 Database

The Esaase exploration database consists of 1,371 inclined surface diamond and reverse circulation drill holes for a total of 261,753.92 metres of drilling. The holes dip between about 90º to 37º orientated mostly towards the southeast, although with a significant number of holes orientated in other directions. Most drill holes are surveyed at 30 metre intervals down-the-hole using a Reflex single shot camera. The sampling interval is mostly 1 metre down the hole, with about 15% at different lengths. There are 250,394 Au values in the current exploration drill hole database. There are also over 24,000 reverse circulation grade control holes. There are 16,687 specific gravity measurements collected using a wax-coat water immersion method.

14.1.1 Geological Models

Wireframe envelopes and surfaces representing topographic surfaces, models for lithology, oxidation state, structures, and mineralization domains were developed using LeapfrogTM modelling software. An original-topography surface is used during grade estimation as an upper domain boundary and an as-mined topographic surface is used to deplete the estimated block grades before reporting resources. A series of 3D wireframes orientated approximately N30°E and steeply dipping represent the Upper sandstone; the Central sandstone; the Cobra unit; the Upper Shales; and the Footwall sandstone. Figure 14-1 shows a cross section through the Main zone looking approximately N30E, highlighting the sequence of these stratigraphic units. These wireframes are used to code lithology into the block model but are not used during grade estimation.

Figure 14-1 Esaase Cross Section Through Main Pit Showing Stratigraphic Units and Drill Hole Databases

Note: Window is ±10 m either side of the section

Three weathering surfaces representing the boundary between Saprolite, Oxides, Transition, and Fresh zones are used to code weathering type into the block model and are used for in situ density estimation and assignment.

Six mineralized envelopes developed for the Esaase resource model update are the most important grade estimation constraints. These mineralized domains were developed by Asanko geologists using a combination of lithology, alteration, structural, and mineralization information. They are not grade shells, rather interpreted section by sections by looking simultaneously at the geologic information described. These wireframes include:


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

While the general thickness of the mineralization varies, Au grades can be traced from section to section (on 40 metre drill hole intersection spacings) with consistency in all three Esaase zones. Mineralization outside the envelopes generally cannot be traced from section to section but there are local small but consistent zones with Au grades of interest.

Figure 14-2 shows a three-dimensional view of the mineralized domains, looking from the Southeast. Drill holes traces and collars are also shown.

Figure 14-2 Esaase Mineralized Domains

Note: Pink: South Pit; Green and Red: Main Pit; Cyan: North Pit. Level 290 m; drill holes traces and collars are also shown. Oblique view from above, looking northwest.

14.1.2 Exploratory Data Analysis

There are 250,394 Au values in the current assay database with a maximum value of 266.84 g/t Au. The gold distribution has a global coefficient of variation of over 7 indicting very high variability as is expected from Birimian-style Au deposits. Figure 14-3 and Figure 14-4 show the raw histogram and basic statistics for Domains 1 and 3, respectively. Domaining reduced the coefficient of variation to approximately 4. The two grade distributions have similar variability and Au grade ranges.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-3 Esaase Histogram and Basic Statistics of Gold (g/t) in Samples Within the Domain 1 (Main Pit, Hanging Wall)

Figure 14-4 Esaase Histogram and Basic Statistics of Gold (g/t) in Samples Within the Domain 3 (Main Pit, Footwall)

14.1.2.1 Density Assignment

In situ density is estimated into the block model using the Inverse Distance Squared method. The arithmetic averages of each type of mineralization are used to assign in situ bulk density to un-estimated blocks. Summary statistics of in situ bulk density by oxidation zone are presented in Table 14-2.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-2 Esaase Statistics of In Situ Bulk Density Values

Unit

Mean (t/m3)

SD

3*SD

Accept. Min Value (t/m3)

Accept. Max Value (t/m3)

SAP

2.26

0.22589

0.67767

1.58

2.94

OX

2.32

0.19758

0.59274

1.73

2.91

TR

2.45

0.23973

0.71919

1.73

3.17

FR

2.74

0.16644

0.49932

2.24

3.24

14.1.2.2 Composites

One-metre-long composites were prepared from the original assay data, truncated at the contacts of the mineralized envelopes. No significant correlation between assayed Au grades and assay length is observed so all resulting composites greater or equal to 0.40 metre are used to estimate grades.

Figure 14-5 and Figure 14-6 show the statistics and histogram of all 1 metre composites for Domain 1 and for Domain 3. The coefficients of variation are 4.55 and 4.00, respectively. Figure 14-7 and Figure 14-8 show the corresponding cumulative probability function graphs for the same Domains. These probability graphs are used to understand the behaviour of the high-grade population and the definition of the indicator thresholds, as discussed below.

Figure 14-5 Esaase Histogram and Basic Statistics, Au (g/t), All 1 m Composites within Domain 1 (Main Pit, Hanging Wall)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-6 Esaase Histogram and Basic Statistics, Au (g/t), All 1 m Composites within Domain 3 (Main Pit, Footwall)

Figure 14-7 Esaase Probability Plot, Au (g/t), All 1 m Composites Within Domain 1 (Main Pit, Hanging Wall)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-8 Esaase Probability Plot, Au (g/t), All 1 m Composites Within Domain 3 (Main Pit, Footwall)

14.1.2.3 Gold Grade Capping/Outlier Restrictions

Table 14-3 shows the capping grades and expected gold metal reduction by domain, based on analysis of cumulative probability curves and quantity of gold metal graphs of the one-metre composite database. Only Domains 0 and 2, estimated by Ordinary Kriging, have this capping applied. The other Domains are estimated using Multiple Indicator Kriging (MIK), which applies high-grade control as discussed below.

Table 14-3 Esaase High-grade Outlier Capping, 1 m Composites

Domain

Outlier
Value

# of Samples
Above Outlier
Value

% of Total
Assay Intervals
Impacted

Non-declustered
Average Before
Capping

Non-declustered
Average After
Capping

% Metal
Reduction

0

2.0 g/t

1,236

0.06%

0.100 g/t

0.073 g/t

27.0%

1

30.0 g/t

60

0.24%

0.940 g/t

0.855 g/t

9.2%

2

5.0 g/t

9

1.28%

0.676 g/t

0.567 g/t

16.0%

3

25.0 g/t

49

0.24%

0.764 g/t

0.714 g/t

6.8%

4

15.0 g/t

17

0.56%

0.579 g/t

0.539 g/t

6.8%

5+6

25.0 g/t

23

0.32%

0.904 g/t

0.834 g/t

7.8%

14.1.2.4 Spatial Clustering

Figure 14-9 shows the declustered histogram and basic statistics of the composites for Domain 1 based on 50 metre declustering cell. The 10% relative difference between the raw and the declustered average grades in Domain 1 indicates some minor clustering.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-9 Esaase De-clustered Histogram and Basic Statistics, 50 m x 50 m x 10 m cell size, Au (g/t), Domain 1

14.1.2.5 Contact Analysis

Quantile-Quantile plots used to compare Saprolite, Oxide, Transition and Fresh composite grades show reasonably similar distributions in all domains except locally at higher grades, supporting a decision to ignore these domain boundaries during grade estimation. Figure 14-10 shows the Quantile-Quantile plots for Oxide versus Transition.

Figure 14-10 Esaase Quantile-Quantile Plot, Au (g/t), Oxide vs Transition Zones, Composites Inside the Mineralized Envelopes


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-11 shows the Au grade profile inside and outside the Domain 1 envelope. As expected, there is a sharp transition in average grades comparing those composites outside with those inside the envelope. Similar sharp transitions are present inside and outside of all other domains, supporting the decision to use only composites within a domain during grade estimation.

Figure 14-11 Esaase Au Grade Profile, Domain 1 Contact with Outside Composites

14.1.2.6 Grade Control Database

The grade control database has 383,584 samples from over 24,000 reverse circulation drill holes. Figure 14-12 and Figure 14-13 show the histogram and basic statistics for all grade control data and the probability plot for Domain 1, respectively. Both reveal a tail in the distribution different from than that observed in the exploration data possibility due to a sampling or downhole contamination issue that is still under investigation. This is not considered to represent a risk to the resource model.

Figure 14-12 Esaase Histogram and Basic Statistics, RC Grade Control Data, All Domains


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-13 Esaase Probability Plot, RC Grade Control Data, Domain 1

This grade control database was compared with the exploration database by homogenizing both to sample lengths of 3 metre and then pairing individual grade control Au samples with Au grades from exploration reverse circulation holes with a 3-metre maximum separation distance. The Quantile-Quantile plot in Figure 14-14 show these two databases have similar Au grade distributions, supporting the decision to use the grade control model to calibrate and adjust estimation parameters during grade estimation.

Figure 14-14 Esaase Quantile-Quantile Plot, Exploration vs Grade Control Au 3 m Composites, No More Than 3 m Apart


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.1.2.7 Variography

Indicator variogram models were prepared for each indicator, for each Domain estimated using MIK. In all cases, 37 directions were run, using a basic lag of 20 metre and directions every 30° in the horizontal, -30°, and -60° planes, for a total of 36 directions. In addition, a vertical variogram (-90°) was also run. SAGE2001© was used to obtain the experimental indicator variograms and resulting model.

The indicator variograms were run using 1 metre composites from the exploration database. The anisotropies and ellipses of continuity for each variogram were checked against known geology and its expected behavior. As expected, along-strike (approximately N30º E) and down dip continuities are the most significant within Esaase. Figure 14-15 shows the summary variogram model of the 0.80 g/t indicator variogram for Domain 3.

Domains 2 and 0 were modeled using Ordinary Kriging. For these domains experimental Au grade pairwise variograms and correlograms, as well as their respective models, were prepared. The pairwise models were chosen as the option providing the more robust models.

Figure 14-15 Esaase Summary Variogram Model, 0.80 g/t Indicator, 1 m Composites, Domain 3


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.1.3 Estimation/Interpolation Methods

The block model is defined in DatamineTM using a 5 x 5 x 3 metre parent block size with a minimum 1 metre sub-cell size and with the following limits which refer to the southwest, lower corner of the block:

Blocks are flagged with a code describing whether they are inside or outside each mineralization, and topographic and oxidation domain.

Multiple Indicator Kriging (MIK) E-type estimation and Ordinary Kriging (OK) is used to estimate Au grades and includes edge dilution at contacts assuming a 0.0 g/t Au grade when no estimates are available on the unmineralized side of the wireframe.

MIK was used for Domains 1 and 3 in the Main Pit; North Pit; and South Pit mineralized envelopes. A very restrictive OK was used outside all mineralized zones and for a small volume to the South of the Main Pit, adjacent to the Footwall mineralized Domain.

Gold grades were estimated into blocks using mostly 1 metre composites within the corresponding Domain, although for the first and final estimation pass grade control data was added. Domain 4 does not have grade control data, so the indicator class means were derived from the declustered composite data.

Search orientations were guided by the variogram models, and the search distances in every case were guided by variography but optimized to reflect a correct balance of estimated blocks in each estimation pass.

Not all blocks are estimated due to the limitation imposed by the search ellipsoids. All non-estimated blocks are assigned a 0.0 g/t Au grade, although the total proportion of non-estimated blocks is very small in mineralized domains.

The indicator variable last class mean is used to control the impact of high-grade outliers. The last class means are presented in Table 14-4. The corresponding capping grades for Domain 0 and Domain 2, estimated with Ordinary Kriging, are as shown previously in Table 14-3.

Table 14-4 Esaase High-grade Au Outlier Control for MIK Domains

Domain

Last Class Mean Used

Metal Removed

1 (Last Indicator 40 g/t)

42 g/t

2.0%

3 (Last Indicator 40 g/t)

42 g/t

1.0%

4 (Last Indicator 24 g/t)

28 g/t

3.2%

5+6 (Last Indicator 40 g/t)

53.63 g/t

0%

Three estimation passes were used to estimate grades based on geologic and geostatistical considerations, including grade continuity from section to section and variogram models. Knowing which block was estimated with what level of information (on which pass) provides the information used for resource classification. Data selection uses anisotropic octant searches. The main parameters used to estimate the Domains with MIK are shown in Table 14-5. The corresponding main parameters of the OK kriging plans used for Domain 0 and Domain 2 are presented in Table 14-6.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-5 Esaase MIK Estimation plans, Domains 1, 3, 4, and 5+6

Domain

Pass

Search in Y, X,
and Z

Search Angles
Rotation, GSlib
Convention

Min No. of
Comps

Max No. of
Comps

Max. No. of
Comps/Octant

1

First

40x12x32m

30/0/0

8

14

2

Second

80x24x64m

30/0/0

8

14

2

Third

180x54x144m

30/0/0

3

14

0

3

First

40x12x32m

30/0/0

8

14

2

Second

80x24x64m

30/0/0

8

14

2

Third

180x54x144m

30/0/0

3

14

0

4

First

40x12x32m

30/0/0

8

14

2

Second

80x24x64m

30/0/0

8

14

2

Third

180x54x144m

30/0/0

3

14

0

5+6

First

50x15x40m

30/0/0

8

14

2

Second

90x30x72m

30/0/0

8

14

2

Third

180x54x144m

30/0/0

3

14

2

Table 14-6 Esaase Kriging Plan, OK Estimation Plans, Domains 2 and 0

Domain

Pass

Search in Y, X, and Z

Search Angles Rotation, GSlib Convention

Min No. of Comps

Max No. of Comps

Max. No. of Comps/Octant)

2

First

30x12x24m

30/0/0

8

12

2

Second

60x24x48m

30/0/0

6

12

2

Third

180x72x144m

30/0/0

2

12

2

0

First

30x9x24m

30/0/0

4

12

2

14.1.4 Validation

14.1.4.1 Visual Validation

Cross sections, longitudinal sections, and plan views were used to check whether the block estimated grades in relation to the nearby composites are reasonable; whether the composited assay data itself was reasonable; whether the oxide/transition/sulfide topographic surfaces, and the lithological and mineralized envelopes were correctly tagged onto the block model; and whether the estimated and assigned in situ density values and final estimated Au grades are reasonable. No evidence of any block being wrongly assigned or estimated was found.

Figure 14‑16 and Figure 14‑17 show the level 194.5 metre for the Northern and Southern areas within Esaase, respectively. Figure 14‑18 shows cross sectional 724500N, while Figure 14‑19 show a longitudinal section roughly orientated along strike. All figures show estimated Au grades and drill hole collars and grades, as well as the grade envelope and where applicable the two topographies.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-16 Esaase Main Pit Au Grade Estimates Within Resource Pit, Level 194.5

Note: Colour-coded according to legend shown. Grade envelope outline shown in red. Resource Pit in green.

Figure 14-17 Esaase South Pit Au Grade Estimates Within Resource Pit, Level 194.5

Note: Colour-coded according to legend shown. Grade envelope outline shown in red. Resource Pit in green.


Figure 14‑18 Esaase Main Pit Au Grade Estimates Within Resource Pit, Cross Section 724500N (Approx.), Looking NE
Note: Colour-coded according to legend shown. Grade envelope outline shown in red. Resource Pit in green.

 

Figure 14‑19 Esaase South Pit Au Grade Estimates Within Resource Pit, Longitudinal Section, Looking NE to the Right of Image
Note: Colour-coded according to legend shown. Grade envelope outline shown in red. Resource Pit in green.

14.1.4.2 Statistical Validation

The comparison of the global averages and basic statistics between the block model at cut-off 0 g/t Au and the declustered composites are shown in Table 14-7 for each Domain. The relative differences between the average estimated grades and the NN-declustered composites are acceptable for all Domains.

Table 14-7 Esaase Global Au Means by Domain

Domain

Avg. Declustered
Composite (NN Model), g/t

Avg Estimated Grades, g/t

Relative Difference

1

0.84

0.80

-4.8%

2

0.53

0.53

0.0%

3

0.69

0.72

-4.2%

4

0.66

0.67

1.5%

5+6

0.88

0.88

0.0%



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-20 shows drift plots with Au estimated block grades and Nearest Neighbour declustered composites in the Easting, Northing, and Vertical directions. These plots show the estimated block grades closely reproduce the grade trends observed in the original composites.

 

Figure 14-20 Esaase Drift Plot, Domain 3 Au Grade Estimates (in Blue) vs Declustered Composites (Nearest Neighbor Model, in Orange)

Note: Histograms are number of data (second Y-axis); Easting, Northing, and Elevations, swaths every 12 m, all kriging passes

14.1.5 Classification of Mineral Resources

The Mineral Resource estimate is classified into Measured, Indicated, or Inferred categories after considering past production reconciliation, observed continuity of mineralization, knowledge of lithological and structural controls on mineralization, and reliability of sampled data and were classified using a multi-stage approach.

The criteria used in the first stage of the resource classification are:

1. Measured blocks – estimated within an ellipsoid that is 40 x 12 x 32 metre (along-strike, across-strike, and sub-vertical respectively), with a minimum of 8 composites from at least 2 drill holes, and 2 composites maximum per octant defined.

2. Indicated blocks – estimated within an ellipsoid that is 80 x 24 x 64 metre (along-strike, across-strike, and sub-vertical respectively), with a minimum of 8 composites from at least 2 drill holes, and 2 composites maximum per octant defined.

3. Inferred blocks – estimated within an ellipsoid that is 180 x 54 x 144 metre (along-strike, across-strike, and sub-vertical respectively), with a minimum of 3 composites from at least 2 drill holes, and 2 composites maximum per octant defined.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The second stage involved the reblocking of the estimation pass indicators to a 10 x 10 x 6 metre temporary block model by majority coding, then using those indicators as data to estimate the three indicators using a simple Inverse Distance (squared) method to assign probabilities of each independently into the parent blocks and then choosing the highest probability as the final category for each block.

The third stage involved analyzing the classification codes in the blocks visually and setting additional restrictions based on elevation to account for where drill holes become sparser at depth. The additional restrictions implemented were:

All blocks outside the mineralized envelope were classified as Inferred. Figure 14-21 and Figure 14-22 show a longitudinal section and a plan view (level 194.5m) of Esaase's resource classification. Also shown are the current and original surfaces, as well as the mineralized envelopes.

Figure 14-21: Esaase Resource Classification, Longitudinal Section

Note: Measured, Indicated, and Inferred are represented by red, green, and blue, respectively. June 2021 topography and Resource Pit limits. Grey blocks are not classified due to being outside the mineralized estimates.

Figure 14-22 Esaase Resource Classification, Level 194.5m.

Note: Measured, Indicated, and Inferred are represented by red, green, and blue, respectively. June 2021 topography and Resource Pit limits. Grey blocks are not classified due to being outside the mineralized estimates.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.1.6 Comparison with Production Results

The 2021 Measured and Indicated Resource Model was compared with the in situ the grade control model (Asanko_CG), with the undiluted mine plan model (Asanko_MP), and with the "Final Mined out" reconciled Mill production tonnages and grades. The comparison is limited to Main and South pit production results from January 1, 2020, through June 30, 2021, at a gold cut-off grade of 0.5 g/t, 0.8 g/t, and 1.3 g/t.

The 2021 Resource Model predicts tonnes, grade and contained metal in the Main pit within 10% relative to the grade control, mine plan, and reconciled mill production at 0.5 g/t Au and 0.8 g/t Au cut-offs, and within 17% at a 1.3 g/t cut off (Table 14-8). These comparisons should not be construed as resources, they are only validation tools.

Table 14-8 Esaase Main Pit Mined-out Volume Comparisons, Resource and Grade Control Models

Esaase Main Mined-out Volume: December 31, 2019 to June 30, 2021 (All Domains)

COG = 0.5

Measured + Indicated

Tonnes

Au (g/t)

Gold (Oz)

2021_RES_MODEL

6,183,071

1.14

226,510

ASANKO_GC

6,104,586

1.19

232,815

ASANKO_MP (UNDIL)

5,815,394

1.16

216,630

2021_RES_MODEL/ASANKO_GC

101.29%

96.06%

97.23%

2021_RES_MODEL/ASANKO_MP (UNDIL)

106.32%

98.34%

104.56%

 

 

 

 

COG = 0.8

Measured + Indicated

Tonnes

Au (g/t)

Gold (Oz)

2021_RES_MODEL

3,666,313

1.49

175,157

ASANKO_GC

3,793,708

1.52

185,566

ASANKO_MP (UNDIL)

3,890,920

1.38

173,063

FINAL MINED (OFFICIAL)

4,018,357

1.34

173,507

2021_RES_MODEL/ASANKO_GC

96.64%

97.67%

94.39%

2021_RES_MODEL/ASANKO_MP (UNDIL)

94.23%

107.41%

101.21%

2021_RES_MODEL/FINAL MINED (OFFICIAL)

91.24%

110.64%

100.95%

 

 

 

 

COG = 1.3

Measured + Indicated

Tonnes

Au (g/t)

Gold (Oz)

2021_RES_MODEL

1,679,401

2.05

110,509

ASANKO_GC

1,798,699

2.08

120,480

ASANKO_MP (UNDIL)

1,613,656

1.81

93,827

2021_RES_MODEL/ASANKO_GC

93.37%

98.24%

91.72%

2021_RES_MODEL/ASANKO_MP (UNDIL)

104.07%

113.17%

117.78%

14.1.7 Reasonable Prospects of Eventual Economic Extraction

The Esaase mineralization is assumed amenable to open pit mining, and milling and recovery through CIL gold processing, and was evaluated for reasonable prospects for eventual economic extraction by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™. The assumptions used in preparing the conceptual pit, include mining and processing costs, metallurgical recovery, metal price and general and administrative costs and other technical parameters. The primary assumptions are shown in Table 14-9 and approximately correspond to the 0.50 g/t Au resource cut-off. A significant additional cost in the case of Esaase is the ore transport overland from the pit to the plant for a total of 30 km approximately. See "Cautionary Note about Mineral Resources".


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-9 Esaase Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.03 - 2.24

Mining Cost Incremental (US$/Vertical 6m)

0.0059 - 0.0193

Mill Feed Transport (US$/tonne)

6.89

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

Refer to Table 13-29

General and Administration (US$/tonne)

6.55

14.1.8 Mineral Resource Estimate

The Esaase Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014. The Qualified Person is Mr. Mario E. Rossi, FAusIMM, SME, IAMG, and Principal Geostatistician of Geosystems International Inc. The effective date of the Mineral Resource estimate is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Esaase Mineral Resource estimates are summarized in Table 14-10.

Table 14-10 Esaase Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured 0.5 10,915 1.25 437
Indicated 0.5 11,655 1.27 475
Measured & Indicated 0.5 22,569 1.26 912
Inferred 0.5 647 1.22 25

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.03/t to $2.24/t mining costs

c. $6.89/t mill feed transport costs

d. $8.79/t, to $11.32/t processing costs

e. Au recoveries per Table 13-29

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

The estimated grades and tonnages of the remaining Measured and Indicated Au mineralization for Esaase and for multiple cut-offs are shown in Figure 14-23.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-23 Esaase Measured and indicated Grade-Tonnage Curves

14.1.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.

There is some risk associated to the Mineral Resource estimate presented in this Report stemming from two different sources. Firstly, the mineralized envelopes are interpretations based on exploration drilling, short-scale production data and pit mapping. The interpretations carry what is considered a moderate level of risk, which affects mostly the predicted mineralized tonnages.

Secondly, the grade estimates are calibrated to grade control model that carries its own level of uncertainty, in addition to the implicit assumption that the calibration holds at depth. While this is a reasonable assumption in the opinion of the QP, it does also imply a moderate level of risk.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.2 Abore Mineral Resource Estimate

14.2.1 Database

The database used to estimate the Mineral Resources of the Abore deposit consists of 525 diamond and reverse circulation drill holes for a total of 50,913.08 metre of drilling. Some of these holes are outside the Mineral Resource area and are not used in the estimation process.

The holes dip between 90º to 37º orientated towards the southwest, with only four subvertical holes, and most others dipping less than 80º. All drill holes are surveyed at approximately 30 metre down-the-hole intervals mostly using a Reflex single shot camera. Older holes are surveyed at longer intervals, initially just once at the bottom of the hole.

There are also 40,459 historical grade control samples from reverse circulation holes. An analysis of paired grade control and exploration samples up to a maximum of one metre separation distance revealed a significant conditional bias that precludes use of the historic grade control data in any calibration or reconciliation of the Mineral Resource estimate. The historical grade control data are not used for this Mineral Resource estimation.

The bulk density database consists of 247 in-situ density values, 183 values coded as "MEAS", and 64 coded as "LAB". MEAS-coded values were determined using wax-coat water immersion method. "LAB" samples have been taken only in the Fresh (or sulfide) zone.

14.2.2 Geological Models

Wireframes and surfaces representing topographic surfaces, lithology, oxidation state, structures, and mineralization domains were developed using Leapfrog modelling software. An original-topography surface is used during grade estimation as a domain boundary and an as-mined surface is used to deplete the estimated block grades before reporting Mineral Resources. A series of granitic and sedimentary rock wireframes are used to code lithology into the block model but are not used during grade estimation. Two weathering surfaces representing the boundary between Oxides and Transition zones and Transition and Fresh zone are used to code weathering type into the block model. They are used for in situ density assignment but are not used for grade estimation.

A series of 0.3 g/t Au grade shells are used to code a mineralized material zone into the block model and are used in grade estimation. Structures that crosscut the granitic mineralized bodies are used to truncate as appropriate the along-strike continuity of the granites and grade shells. Figure 14-24 shows a three-dimensional view of the Au grade shells and the original-topography surface. Drill holes traces and collars are also shown.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-24 Abore Three-dimensional View of the 0.3 g/t Au Grade Envelope in Red and Topography in Brown

Note: Looking from underneath to the northwest; drill holes traces and collars are also shown.

14.2.3 Exploration Data Analysis

The drill hole sampling is mostly at one-metre intervals, although approximately 30% are at two-metre intervals. There are 33,342 assays in the overall database with a maximum value of 140 g/t Au. The gold distribution has a global coefficient of variation of almost five, indicating high variability, as would be expected in Birimian-style Au deposits

Figure 14-25 and Figure 14-26, show about 26% of the total assay intervals captured by the grade envelope are below 0.3 g/t Au, which is an adequate amount of dilution to limit occurrence of some of the artifacts that the use of grade envelopes can cause during grade estimation.

Figure 14-25 Abore Histogram and Basic Statistics of Samples Within the Grade Envelope, Au ≥ 0.3 g/t


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-26 Abore Histogram and Basic Statistics of Samples Within the Grade Envelope, Au < 0.3 g/t

14.2.3.1 Density Assignment

The average measured density of "LAB"-coded samples combined, or by separate oxidation domain is 3% to 10% greater than comparable "MEAS"-coded samples. Only the arithmetic averages "MEAS"-coded samples by oxidation domain are used to assign densities to the block model because the waxed coat method used to determine the "MEAS"-coded sample densities is generally a reliable procedure and because and the use of the apparent high-bias "Lab" coded samples might result in an over estimation of tonnage. The summary statistics of the in-situ density used in the Mineral Resource estimate are presented in Table 14-11.

Table 14-11 Abore Statistics of Density Values, "MEAS", Abore

Mineralization Type

Number of Samples

Mean

Standard Deviation

Interval [Mean±3*σ]

Oxide

29

1.67

0.0399

{1.55 ≤ 1.67 ≤ 1.79}

Transition

8

2.04

0.0629

{1.85 ≤ 2.04 ≤ 2.23}

Fresh/Sulphide

146

2.62

0.0093

{2.59 ≤ 2.62 ≤ 2.65}

14.2.3.2 Composites

One-metre-long composites were prepared from the original assay data, truncated at the contact of the 0.30 g/t Au envelope. No significant correlation between assayed Au grades and assay length is evident so all resulting composites greater or equal to 0.40 metre were used to estimate grades. Figure 14-27 shows the basic statistics of all composites inside the 0.3 g/t Au envelope. The coefficient of variation is 3.279. Figure 14-28 shows the cumulative probability function for the composites inside the 0.3 g/t Au grade envelope. This probability graph was used as a guide to define the capping thresholds as discussed below.

Quantile-Quantile plots of Au grade distributions of weathered and non-weathered domain one-metre composites within the 0.3 g/t Au envelope are virtually identical up to the 1.50 g/t Au and very similar up to the 3.0 g/t Au thresholds supporting the decision to ignore the oxidation boundaries when estimating grade.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-27 Abore Histogram and Basic Statistics, Au grades, All 1 m Composites Inside the 0.3 g/t Au Envelope

Figure 14-28 Abore Probability Plot, Au, Inside the 0.3 g/t Au Mineralization Envelope


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.2.3.3 Gold Grade Capping/Outlier Restrictions

A 30.0 g/t Au grade capping value was applied to the one-metre composite database based on a review of a cumulative probability plot and a quantity-of-metal graph for the composite data inside the 0.30 g/t Au grade envelope. The probability plot in Figure 14-28 shows the Au grade inside the 0.30 g/t Au envelope plots as a homogeneous distribution. Table 14-12 shows 0.36% of the composites were capped at 30.0 g/t Au resulting in an 8.25% metal reduction.

Table 14-12 Abore Definition of High-Grade Au Capping, 1 m Composites

Zone

Outlier
Value

Number of
Samples Above
Outlier Value

% of Total
Assay Intervals
Impacted

Non-declustered
Average Before
Capping

Non-declustered
Average After
Capping

% Metal
Reduction

Inside 0.3 g/t Envelope

30.0 g/t

55

0.36%

1.381 g/t

1.267 g/t

8.25%

14.2.3.4 Spatial Clustering

Figure 14-29 shows a histogram and basic statistics of the declustered composites inside the 0.30 g/t Au envelope based on a 50-metre declustering cell size. The 20% relative difference between the raw and the declustered average grades inside the 0.30 g/t Au mineralized envelope indicate significant clustering inside the grade shell.

Figure 14-29 Abore Declustered Histogram and Basic Statistics, 50 m Cell Size, Au Grades, Inside the 0.30 g/t Au Envelope

14.2.3.5 Contact Analysis

The only relevant contact is the 0.30 g/t Au envelope since the oxide/transition/sulfide surfaces will be ignored at the time of estimation. Figure 14-30 shows the Au grade profiles near the 0.30 g/t Au envelope contact. As expected, there is a sharp transition in average grades comparing those composites outside with those inside the envelope supporting the decision to use only composites within a domain during grade estimation.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-30 Abore Average Au Grade Profiles Near Contact of the 0.2 g/t Envelope

14.2.3.6 Variography

A correlogram model as well as a pairwise (PW) model for the overall Au distribution within the 0.30 g/t Au envelope was also obtained as a tool to aid in the later classification of the resources and to provide models for the internal dilution study as described below.

Figure 14-31 Abore Summary Variogram Model, 0.30 g/t Au Indicator, 1 m Composites Inside the 0.30 g/t Envelope


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Effective Date: February 28, 2022

14.2.4 Estimation/Interpolation Methods

The block model is defined in Datamine using a 5 x 5 x 3 metre parent block size with a minimum 1 metre sub-cells size with the following limits which refer to the southwest, lower corner of the block:

An Indicator-modified Ordinary Kriging (IMOK) method is used to estimate Au grades within the 0.30 g/t Au envelope, only using composites within the 0.30 g/t Au envelope and includes edge dilution at the contact of the 0.30 g/t Au envelope, assuming a 0.0 g/t Au grade on the outside of the grade envelope. Not all blocks inside the 0.30 g/t Au envelope are estimated due to the limitation imposed by the search ellipsoids, which generally do not fill completely the volume defined by the envelopes. The total proportion of non-estimated blocks is very small, and they are assumed to have a 0.0 g/t Au grade.

Ordinary Kriging (OK) is used to estimate an indicator variable of the proportion of each block above 0.30 g/t Au and for the grades of the proportion above the 0.30 g/t Au threshold. The same process is used to obtain a grade estimate of the proportion of the block below 0.30 g/t. In all cases a discretization of 2 x 2 x 2 points per block in X, Y, and Z directions is used.

Search orientations are guided by the variogram models, and the search distances in every case are guided as well by variography but optimized to reflect a correct balance of estimated blocks in each estimation pass. Three anisotropic octant search passes were used. A maximum of 2 composites per octant was used for all three passes. The main parameters used to estimate the indicator variable and Au grade are shown in Table 14-13.

Table 14-13 Abore Ordinary Kriging plan, 0.30 g/t Indicator and Au Grade Estimation Inside 0.30 g/t Grade Envelope

Pass

Search in Y, X,
and Z

Search Angles,
Rotation, GSLib
Convention

Min. No. of
Comps

Max No. of
Comps

Max No. of
Comps/Octant

First

25x12.5x16.75m

30/-5/10

8

8

2

Second

60x30x40m

30/-5/10

8

8

2

Third

120x60x80m

30/-5/10

3

12

2

14.2.5 Validation

14.2.5.1 Visual Validation

Cross sections, longitudinal sections, and plan views were used to check whether the block estimated grades in relation to the nearby composites are reasonable; whether the composited assay data itself was reasonable; whether the oxide/transition/sulfide, topographic surfaces and the 0.30 g/t Au envelope produced were correctly tagged onto the block model. No evidence of any block being wrongly estimated or tagged was found.

Figure 14-32 and Figure 14-33 show level 157.5 metre for the Northern and Southern areas within Abore, respectively. Figure 14-34 shows a cross sectional view of 714179N, while Figure 14-35 shows a longitudinal section roughly orientated along strike. All figures show estimated Au grades and drill hole collars and grades, as well as the grade envelope and where applicable the two topographies.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-32 Abore Au Grade Estimates, Level 157.5, Northern Area

Note: Colour-coded according to legend shown. Grade envelope outline shown in red.

Figure 14-33 Abore Au Grade Estimates, Level 157.5, Southern Area

Note: Colour-coded according to legend shown. Grade envelope outline shown in red.

Figure 14-34 Abore Au Grade Estimates, Cross Section 714170N

Note: Colour-coded according to legend shown. Grade envelope outline shown in red.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-35 Abore Au Grade Estimates, Longitudinal Section

Note: Colour-coded according to legend shown. Only blocks within grade envelope are shown.

14.2.5.2 Statistical Validation

Table 14-14 shows the comparisons for the sub-celled and the final re-blocked 5 x 5 x 3 metre models, highlighting the average grade. The 1 metre composites were declustered using a Nearest-Neighbor (NN) model. In the final model the estimated grades average (AUIMOK column) is about 3% lower than the declustered composites (AUNN column), which is considered acceptable.

Table 14-14 Abore Basic Statistics, Estimated Grades vs 1 m Declustered Composites, Sub-celled and Final, Re-blocked Models

 

SUBCELL

REBLOCKED (5x5x3m)

 

AUIMOK

AUNN

AUIMOK

AUNN

NUMBER

2395473

2395473

172292

172292

MINIMUM

0.036

0.010

0.001

0.000

MAXIMUM

95.282

34.500

89.895

34.500

MEAN

1.0290

1.1390

0.8400

0.8670

VARIANCE

2.3869

4.0552

2.0856

2.8515

STANDDEV

1.5450

2.0138

1.4442

1.6886

COEF_OF_VAR

1.5008

1.7674

1.7183

1.9470

Figure 14-36 shows drift plots with estimated Au block grades and averages of Nearest Neighbour declustered composites Au grades in the Easting, Northing, and the Vertical directions, and show that the estimated block grades closely reproduce the grade trends observed in the original composites.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


 

Figure 14-36 Abore Drift Plot, Au Grade Estimates (in Blue) vs Declustered Composites (Nearest Neighbor Model, in Orange)

Note: Histograms are number of data (second Y-axis); swaths every 50 m, all kriging passes.

14.2.5.3 Discrete Gaussian Model Check

A change of support check was made for the entire volume within the 0.3 g/t Au grade envelope. The Discrete Gaussian model was applied after deriving the corresponding variogram model and obtaining the dispersion variance for the 5 x 5 x 3 metre selective mining unit (SMU) size.

The model parameters corresponding to the correlogram obtained for the entire domain is shown in Figure 14-37. The corresponding SMU-sized block dispersion variance is 0.8175, indicating that on average there is a very significant mixing of grades within an SMU block, which results from highly variable Au mineralization.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-37 Abore Summary Correlogram Model Parameters, Au Within the 0.3 g/t Au Grade Envelope

Table 14-15 shows the comparison between the SMU theoretical grade-tonnage curve and the sub-celled Abore Resource Model for some specific cut-offs. The key cut-off to consider in the case of the Resources is the reporting cut-off of 0.5 g/t Au, for which the tonnages and grades are within 5% relative difference of each other, and the metal content is less than 2% relative difference. Higher cut-offs are an issue for the Reserves model, as the predicted higher grades, according to the Discrete Gaussian model, are not realistic. Therefore, it is necessary to dilute further the grades at the time of converting the Resource model to the Reserve model which is discussed in more detail in the Section 15.

In summary, these checks show that the Abore Resource model at the 0.5 g/t Au cut-off is well validated, and that there is the need for selectively diluting the higher grades to obtain a reasonable Reserves model.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-15 Abore Relative Differences at Critical Cut-offs, SMU Theoretical Model vs Sub-celled Model

Au
Cutoff
(g/t)
 

SMU (DGM Model)

Sub-celled Block Model (SBM)

Relative Differences

SMU.
Prop.
Tonnes
(%)

SMU Au
(g/t)

SMU
Prop.
Metal
(%)

SBM
Prop.
Tonnes
(%)

SBM
Au (g/t)

SBM
Prop.
Metal
(%)

Tonnes

Grade

Metal

0.00

100.0%

1.134

100.0%

100.0%

1.147

100.0%

100.00%

101.15%

0.0%

0.50

83.4%

1.281

94.2%

79.3%

1.344

92.9%

95.03%

104.92%

-1.3%

0.80

55.2%

1.607

78.2%

46.0%

1.854

74.4%

83.39%

115.37%

-3.8%

1.30

27.2%

2.216

53.1%

22.4%

2.750

53.8%

82.57%

124.10%

0.7%

These and the other statistical and visual checks presented indicate that the block model grades behave as expected, with an adequate degree of smoothing, and without obvious anomalous values. It is globally unbiased, and internally consistent with the composites and variogram models used to create it.

14.2.6 Classification of Mineral Resources

The Mineral Resource estimate is classified into Measured, Indicated, or Inferred categories after considering the reliability of the geological interpretation, the continuity of Au grades observed in the 0.3 g/t Au grade envelopes and shown in the 0.30 g/t Au indicator variogram, sample support and reliability of the sample data, and past production results at Abore. While the historical grade control data from Abore is insufficient to calibrate the resource model, the predictions regarding the amount of gold contained in previously mined area confirm continuity of Au.

Resource classification at Abore uses a two-stage approach. The criteria used in the first stage of the resource classification process are:

The second stage involved the re-blocking of the estimation pass indicators to a 10 x 10 x 6 metre temporary block model by majority coding, then using those indicators as data to estimate the three indicators using a simple Inverse Distance (squared) method to assign probabilities of each independently into the parent blocks and then choosing the highest probability as the final category for each block.

Figure 14-38 and Figure 14-39 show a longitudinal section and a plan view (level 187.5m) of Abore's Mineral Resource classification. Also shown are the current and original surfaces, as well as the 0.30 g/t Au grade envelope.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-38 Abore Resource Classification, Longitudinal Section

Note: Measured, Indicated, and Inferred are represented by red, green, and blue, respectively. Original topography; pit limit topography, and 0.30 g/t grade envelope in red.

Figure 14-39 Abore Resource Classification, Level 187.5m

Note: Measured, Indicated, and Inferred are represented by red, green, and blue, respectively. Original topography; pit limit topography, and 0.30 g/t grade envelope in red.

14.2.7 Reasonable Prospects of Eventual Economic Extraction

The Abore mineralization is assumed amenable to open pit mining, and milling and recovery through CIL gold processing, and was evaluated for reasonable prospects for eventual economic extraction by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™. The assumptions used in preparing the conceptual pit, include mining and processing costs, metallurgical recovery, metal price and general and administrative costs and other technical parameters. The primary assumptions are shown in Table 14-16 and approximately correspond to the 0.50 g/t Au Mineral Resource cut-off. See "Cautionary Note about Mineral Resources".

Table 14-16 Abore Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.025 - 1.647

Mining Cost Incremental (US$/Vertical 6m)

0.0087 - 0.0353

Mill Feed Transport (US$/tonne)

3.86

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.2.8 Mineral Resource Statement

The Abore Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014. The Qualified Person is Mr. Mario E. Rossi, MAusIMM, SME, IAMG, and Principal Geostatistician of Geosystems International Inc. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-17.

Table 14-17 Abore Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured 0.5 3,193 1.46 150
Indicated 0.5 5,123 1.23 203
Measured & Indicated 0.5 8,316 1.32 353
Inferred 0.5 1,109 1.55 55

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.025/t to1.647/t mining costs

c. $3.86/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

Grade and tonnage curves are shown in Figure 14-40.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-40 Abore Measured and Indicated Grade-Tonnage Curves

14.2.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.

There is some risk associated to the Mineral Resource estimate presented in this Report because of the interpreted grade envelope. The interpretation is based on more widely-spaced exploration drilling, and carry what is considered a moderate level of risk. This risk affects the predicted mineralized tonnages.

While the change of support check results in a good validation of the estimated grades, the change of support model used is based on certain assumptions and parameters that carry a degree of uncertainty, which is also carried to the grade estimates. The uncertainty and risk implied in the grade estimates is considered low on a global basis, corresponding to no less than yearly production volumes. Less uncertainty for quarterly production periods would require additional infill drilling.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.3 Nkran Mineral Resource Estimate

14.3.1 Database

The Nkran exploration data used in the MRE is 928 diamond, reverse circulation, and reverse circulation with diamond tail drill holes totalling 82,460 metres of drilling with 81,464 Au assays. There are also 11,994 reverse circulation grade control drill holes totalling 338,583 metres of drilling with 225,722 Au assays. The dataset includes 36 new exploration diamond drill holes and 30 GC RC holes drilled since 2018. The exploration data was restricted to data selected up to 10 metre above the 31 May 2017 as-mined surface. A summary of the exploration drilling data, as used in the MRE, is shown in Table 14-18. All subsequent data analysis, statistics, and estimation for the MRE are limited to the validated dataset. Note that all figures and tables for the Nkran MRE section of this report were prepared by CSA Global unless otherwise stated.

Table 14-18 Nkran Database - Summary of Exploration Drill Data Used in the MRE

Description

DDH

RC

RCD

Total

Number of Holes

291

600

38

928

Metres Drilled

50,697

24,321

7,442

82,460

Number of Assays

49,787

24,236

7,441

81,464

Number of BD Measurements

273

-

-

273

Validation checks were completed after the drill data were imported into SQL and Datamine StudioRM™ software. The QP confirms that no issues that would have a material impact on the MRE were identified.

Core recovery data was not recorded for the 30 new diamond holes. Core recoveries are not expected to change in the new drilling as it infills existing drillholes. In 2018, core recovery data were reviewed for DDH and RCD core, selected below the 31 May 2017 mined surface. The results show that recoveries are reasonable within oxide (74%) and good within transitional (85%) and fresh material (98%). Oxide material in core accounts for 5% of the recovery data, whereas transitional and fresh material in core accounts for 2% and 93% of the recovery data, respectively. Core recovery for the fresh material shows good recovery for both DD (98%) and RCD (98%). Further review of the core recovery data indicates that there is no relationship between grade and recovery.

14.3.2 Geological Models

The 31 May 2017 as-mined surface is used as an upper domain boundary during grade estimation. The reported Mineral Resource estimate is limited to material below the June 2020 as-mined surface.

The 3D lithological and structural models were prepared by Asanko geologists using Leapfrog software. The host lithologies constitute three sandstone units (western, central, and eastern), two granite units (main and skinny), and two breccia units (north and south). The modelled geological wireframes provide the basis of the mineralization domains and were used to flag assay, composites, and blocks. The lithology domains are shown in Figure 14-41.

In addition to adjustments made for new drilling, the Skinny and Main Granites were re-interpreted from pit-mapping which resulted in volume changes for domains not influenced by the new drilling. The dominant sandstone domain, the Western Sandstone, has gained volume mainly from material that was interpreted as barren siltstone in 2018. A smaller proportion of the volume increase can be attributed to material previously assigned to other non-siltstone domains. The South Breccia and Central Sandstone domains were extended to the southwest to include mineralization in surface holes that had not been included previously.


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Effective Date: February 28, 2022

Figure 14-41 3D View of the Nkran Geological Domains Within the June 2020 Mining Surface

Asanko geologists created weathering profiles for the bottom of oxidation and the top of fresh material in Leapfrog (Figure 14-42). These surfaces were used to flag weathering into the updated model and code density values into the blocks. Note that 99% of the rock within the extents of the current MRE volume is unweathered.

Figure 14-42 Cross-section View of the Nkran Weathering Profiles and Geological Domains

Note: Bottom of Complete Oxidation (dotted red line); Top of Fresh (dotted blue line); December 2018 Pit Shell (solid brown line)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The main lithological units, within specific fault blocks, form the basis for delineating geological domains (GEOL). Within the domains the mineralized and waste volumes have been defined using an Indicator Kriging (IK) method.

A grade compositing process in Datamine Studio RM called CompSE was used to generate 'mineable' intercepts - that is, a set of intercepts that meets set minimum length, grade and dilution criteria. The minimum grade used to delineate mineralization from waste was 0.3 g/t Au. The minimum true width used was 3 m, in line with the SMU size of 5 x 5 x 3 m (X Y x Z) modelled. Intercepts that met the CompSE criteria were assigned a value of 1 and intercepts that did not, were assigned a value of 0. The 1 and 0 values are then estimated into a block model (2.5 x 2.5 x 3 m for better resolution) using dynamic anisotropy based on structural wireframes.

The indicator estimates produce a value between 0 and 1 which is then used as a probability for establishing if a cell is mineralized, or not. Specific probabilities are selected for each domain that represent expected mineralization volumes. The probability thresholds chosen were derived in 2018 from the results of testwork done in a trial area (documented in 2019 NI 43-101) with good exploration and grade control data coverage. The threshold values are retained and used in this update.

The mineralization volumes selected within the lithology wireframes were visually validated and compared with those of the previous MRE. The overall volume increase of the mineralized model is 1% compared with the previous MRE. There is a 3% increase in the mineralized model for the most materially significant Western Sandstone domain. The volume difference between the 2018 and 2020 for each domain is presented in Table 14-19).

Table 14-19 Comparison of Nkran Domain Volumes Based on the Interpreted Geology Wireframes 2018 vs 2020

Domain

Description

2018

2020

Difference

Variance

210

Western Sandstone

14,754,525

18,670,463

3,915,938

27%

220

Central Sandstone

15,766,181

14,769,825

-996,356

-6%

230

Eastern Sandstone

22,612,406

22,697,850

85,444

0%

310

Main Granite

6,365,006

6,501,694

136,688

2%

320

Skinny Granite

1,485,769

1,195,106

-290,663

-20%

510

South Breccia

2,241,825

2,751,488

509,663

23%

520

North Breccia

3,529,594

3,379,556

-150,038

-4%

Total

 

66,755,306

69,393,281

2,637,975

4%

14.3.3 Exploration Data Analysis

Statistical analysis was carried out using Datamine Studio, Snowden Supervisor and GeoAccess Professional software packages.

The exploration dataset was assessed for bias in Au grade between the sample types (DDH, RC and RCD). Summary statistics and probability plots (Figure 14-43) indicate the datasets are similar and appropriate to be used together as part of the estimation.

The exploration data was also compared to the grade control to the grade control reverse circulation data. QQ plots comparing the Au grades of exploration data with the grade control reverse circulation data within a common volume for each of the mineralized domains illustrates plots selected for the Western and Central Sandstone are reasonably compatible (Figure 14-44). Summaries of the domain codes used to distinguish the data during geostatistical analysis and estimation are shown in Table 14-20.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-43 Nkran Log Probability Plots Comparing Top-cut Au Grades in DDH, RC and RCD Drill Holes

Note: DDH (green); RC (blue); RCD (red) Samples used for IK, restricted to ORE=1, based on CompSE criteria.

Source: CSA Global, 2021

Figure 14-44 Nkran QQ Plots Comparing Au Grades in the Exploration Dataset (X axis) to the Dynamic RC GC Dataset (Y axis) for Western Sandstone (LHS) and Central Sandstone (RHS)

Source: CSA Global, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-20 Nkran Data Field Flagging and Description

Field Code Description
OXIDE 1
2
3
Oxide
Transitional
Fresh/Sulphide
GEOL 210
220
230
310
320
510
520
900
Western Sandstone
Central Sandstone
Eastern Sandstone
Main Granite
Skinny Granite
South Breccia
North Breccia
Siltstone/Waste
ESTZON 210
220
230
310
320
510
Western Sandstone and IK_USE=1
Central Sandstone and IK_USE=1
Eastern Sandstone and IK_USE=1
Main Granite and IK_USE=1
Skinny Granite and IK_USE=1
South Breccia/North Breccia and IK_USE=1
IK_USE 0
1
Waste
Mineralization

Note: ESTZON defines the mineralization domains and is based on GEOL, and where IK_USE=1.

The naïve statistics per ESTZON domains are shown in Figure 14-45.

Figure 14-45 Nkran Log Probability Overlay plots of Uncut Au g/t within the Estimation Domains (ESTZON)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.3.3.1 Density Assignment

The in-situ dry bulk density (BD) dataset consists of in-pit grab samples and drill core with specific gravity measurements determined using a water immersion method with the following formula:

The mean densities for fresh sandstone, the dominant mineralization host rock, is in the region of 2.67 to 2.71, with low variance. An in-situ dry bulk density of 2.68 t/m3 was selected for all fresh material and the Western sandstone. There are insufficient samples in the oxide and transitional domains to estimate a value with any confidence. Densities for transitional material were set at ~75% of the fresh material, 2.00 t/m3, and oxide material set at ~65% of the fresh material, 1.72 t/m3. Less than 1% of the remaining resource is transitional, so the accuracy of these in-situ dry bulk densities is not materially significant.

14.3.3.2 Composites

A 1 metre composite length is used in the 2020 estimate. Prior to compositing, data flagged as oxide and transitional were removed, since the area for the current Mineral Resource estimate update is all within fresh material.

One-metre composites were prepared respecting ESTZON domain boundaries with a minimum composite length of 0.5 m. All composites are used for the geostatistical analysis and the grade estimate. The potential bias impact of retaining the 108 short composites is considered minimal. The descriptive analysis for the ESTZON domains is shown in Table 14-21.

Table 14-21 Nkran Composite Statistics per ESTZON

ESTZON

No. of
Samples

Minimum (g/t
Au)

Maximum (g/t
Au)

Mean (g/t Au)

Variance

Coefficient of
Variation

210

6,187

0.01

40

2.15

20.10

2.09

220

3,299

0.01

40

1.57

12.58

2.25

230

713

0.01

18

1.25

6.50

2.04

310

1,812

0.01

40

1.12

9.76

2.79

320

1,053

0.01

30

1.60

13.40

2.29

510

741

0.01

25

1.61

7.70

1.72

14.3.3.3 Gold Grade Capping/Outlier Restrictions

Cutting strategy was applied based on the following:

Histograms and probability plots were reviewed for Au g/t within each individual estimation domain to determine the top-cut. Composites greater than the top-cut values were reset to the respective top-cut values. The number of values cut was minimal compared to the total domain population, and cutting these values generally had little impact on the mean grade of the domains. The uncut and top-cut statistics, including the impact on metal cut and number of samples cut, per estimation domain, are shown in Table 14-22.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Table 14-22 Nkran Top-cut Statistics per ESTZON

ESTZON

Total

Top Cut

#Cut

Uncut Mean

Cut Mean

% Metal Cut

Uncut CV

Cut CV

210

6,187

40

24

2.37

2.15

-9%

3.56

2.09

220

3,299

40

9

1.74

1.57

-9%

3.88

2.25

230

713

18

5

1.44

1.25

-13%

3.86

2.04

310

1,812

40

5

1.17

1.12

-4%

3.41

2.79

320

1,053

30

6

1.84

1.68

-9%

3.49

2.29

510

741

25

1

1.63

1.61

-1%

1.82

1.72

Note: CV - coefficient of variation

14.3.3.4 Variography

Experimental variograms prepared using the 2020 exploration and grade control dataset were compared with variogram models prepared to support the 2018 Mineral Resource. The variogram models calculated in 2018 are retained for the 2020 estimation update.

In 2018, Au grade control variograms were modelled on 1.5 metre top-cut grade control composites, restricted to trial area used for the IK test work. Nuggets were obtained from the downhole variograms, where the lag was set equal to the composite length of 1.5 m. Directional experimental semi variograms were calculated in Gaussian space and modelled and then back transformed to raw space prior to using them in estimation or change of support calculations. Although nuggets and sills were normalized to one, they were scaled to the exploration sample variance prior to change of support calculations and estimation. Table 14-23 presents the variogram model parameters used in change of support calculations and estimation.

Table 14-23 Nkran Variogram Models for Au g/t

ESTZON Rotation
(ISATIS ZYX)
Nugget Structure 1 Structure 2
Partial sill Range Partial sill Range
210 50 8.03 8.39 15 1.43 100
0 10 90
-70 5 40
220 50 4.63 5.70 10 0.43 55
0 10 50
-80 8 35
230 60 3.14 3.00 10 1.17 85
0 10 30
-80 4.5 12
310 70 5.09 6.18 45 0.85 110
0 40 80
-80 10 30
320 50 5.28 6.75 10 0.25 50
0 10 50
-80 10 20
510 60 3.96 3.96 15 1.29 100
0 15 80
-80 10 20


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Effective Date: February 28, 2022

14.3.4 Estimation/Interpolation Methods

14.3.4.1 Block Model

The block model is defined in Datamine using a 10 x 20 x 6 metre parent block size with a minimum 2.5 metre sub-cell size. The model is limited to below the 31 May 2017 as-mined surface. The model parameters, including cell dimensions and model extents, are shown in Table 14-24. The model was not rotated.

Blocks are flagged with GEOL, OXIDE, TOPO, MINED, IK_USE, and ESTZON domain codes. Density is assigned to each block based on oxidation domain.

Table 14-24 Nkran Block Model Dimensions

Axis

Origin (m)

Model Extent (m)

# Blocks

Maximum Cell
Size (m)

Minimum Cell
Size (m)

Easting (X)

610,500

2,500

250

10

2.5

Northing (Y)

699,600

2,400

120

20

2.5

Elevation (Z)

494

1,212

202

6

3

14.3.4.2 Grade Estimation

The Nkran Mineral Resource is estimated using post-processing of Ordinary Kriged (OK) large panel estimates to produce a recoverable Mineral Resource. This method provides Selective Mining Unit (SMU) scale block estimates that honour the theoretical grade-tonnage relationship determined from discrete Gaussian change of support. Uniform Conditioning (UC) results for the large OK panels are transferred to SMU blocks using Localized Uniform Conditioning (LUC). The quality of the results is dependent on the availability of drill hole data and the nature of the spatial variance. The most material domains in terms of metal are 210 and 220; these domains are used and presented here to document the workflow.

14.3.4.3 Declustering

Declustering at Nkran was undertaken in two stages. For preliminary statistics and first pass estimation, a (20 x 40 x 12 metre) cell weighting strategy was used, which considers all samples when determining the average. Following first pass ordinary kriging, the Kriging weights were written out and the process was re-run. The process using Kriging declustering weights is what was used to generate the estimate.

14.3.4.4 Gaussian Anamorphosis Modelling

UC uses the Gaussian anamorphosis and Hermitian polynomial formalism to define the joint distributions of point, SMU, and panel scale estimates. Eighty Hermite polynomials were used on grade top-cut, declustered data (declustering weights derived through Ordinary Kriging).

The models for ESTZONs 210 and 220 are presented in Figure 14-46. The histograms for raw Au grades for these domains are presented in Figure 14-47 and Figure 14-48 alongside the Gaussian transformed values. The Gaussian transform has resulted in a mean of zero and a variance of one, as expected.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-46 Nkran Gaussian Anamorphosis Models for ESTZON 210 (Left) and ESTZON 220 (Right)

Figure 14-47 Nkran Histogram of Au (Left) and Gaussian Transformed Au (Right) for ESTZON 210

Figure 14-48 Nkran Histogram of Au (Left) and Gaussian Transformed Au (Right) for ESTZON 220


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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14.3.4.5 Ordinary Kriging

Estimation was by Ordinary Kriging into 10 x 20 x 6 metre panels and 5 x 5 x 3 metre SMUs using ISATIS. Search ellipsoid orientations were defined by dynamic anisotropy, derived from the interpreted structures and geological controls. The dip and dip direction of the major axis of anisotropy were calculated from each triangle of the defined fault wireframes (Freelander, County and Discovery). Sample search neighbourhoods were designed to be extremely large to ensure a smoothed panel estimate for use in conditioning the panel. For the ranking of SMUs, the minimum and maximum number of samples were decreased substantially.

14.3.4.6 Support Correction

Block and point anamorphosis modelling of the estimated values and sampled data were undertaken as the primary input of the Uniform Conditioning. The support definition for the block anamorphosis is based on the SMU size. Information effect was computed. Block support correction values for each of the ESTZON domains range from 0.67 to 0.84 and following application of 10 x 10 x 1 metre information effect 0.62 to 0.80, (Table 14-25).

Table 14-25 Nkran Change of Support Calculations

ESTZON

Real Block Support Correction (r)

Kriged Block Support Correction (s)

210

0.68

0.64

220

0.70

0.66

230

0.68

0.63

310

0.83

0.80

320

0.72

0.67

510

0.73

0.68

14.3.4.7 Uniform Conditioning

Estimation of recoverable resources was completed using Uniform Conditioning. The input for UC was the OK model at the panel scale and the output was an Au grade-tonnage curve for each panel at the SMU scale. For a discretized grade tonnage curve, 90 cut-offs were used and five iso-frequency classes. The dispersion variance estimated through Ordinary Kriging was used alongside the Kriged panel grade per domain.

14.3.4.8 Localized Uniform Conditioning (LUC)

The UC grade tonnage factors of the panel were proportioned based on the domain SMU in the panel to accurately represent Q (metal), T (tonnes) and M (grade) in the domain.

To provide a block model for use in mine planning, SMU sized blocks were Kriged, and the resultant SMUs were ranked from 1 to 64, with the actual grades being discarded and only the ranking remaining. Grades were then read off the panel grade-tonnage curve for each SMU and assigned based on the estimated ranking. The result is the assignment of single grades to SMU sized blocks so that the 64 SMUs in each panel achieve a grade-tonnage tabulation matching that of the panel estimated through UC.

To assess the performance of the LUC process, grade tonnage curves from LUC were compared to those derived from UC for the main domains. These were found to be very comparable.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.3.5 Validation

14.3.5.1 Visual Validation

OK Panel Validation

The block model was visually reviewed section by section and in 3D to ensure that the grade tenor of the input data was reflected in the OK model panels. Generally, the estimate compares well with the input data. Example cross-sections for the two largest domains, ESTZON domains 210 and 220, are shown in Figure 14-49. The grades in the composites align with the corresponding grades in the block model.

 

Figure 14-49 Nkran Cross-section View - OK Panel Model and Composites (ESTZON 210 on Left, ESTZON 220 on Right)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.3.5.2 Statistical Validation

Declustering

A 25 x 25 x 25 metre cell-weighted declustering was used during the validation of the OK and LUC models. The statistical difference between the naïve and declustered composites against the OK block grades and the LUC block grades were assessed both globally and on individual domains and are reported in Table 14-26. Scatterplots showing UC panel grade vs OK panel grade for ESTZON domains 210 and 220, both at a zero cut-off, are shown in Figure 14-50. Globally, both the OK and LUC models validate well, showing 1% and 7% difference between the declustered composites and the block estimates, respectively. By estimation domain, the validation results are reasonable, considering that areas with over- or underestimation are generally coincident with poorer drill hole support.

Table 14-26 Nkran Statistical Validation of Estimation Domains

ESTZON 

 

Count

Minimum

Maximum

Mean

CV

GLOBAL

Composites Naïve

13,805

0.005

40

1.75

2.22

Composites Declustered

13,805

0.005

40

1.57

2.33

OK Model

26,074

0.01

9.25

1.55

0.48

LUC Model

282,855

0.013

20.16

1.68

0.96

Difference [(Composite Declustered Grade - OK Grade)/OK Grade]

-1%

 

Difference [(Composite Declustered Grade - LUC Grade)/LUC Grade]

7%

 

210

Composites Naïve

6,187

0.005

40

2.15

2.09

Composites Declustered

6,187

0.005

40

1.88

2.25

OK Model

12,451

0.47

9.25

1.89

0.45

LUC Model

122,243

0.08

20.16

1.97

0.87

Difference [(Composite Declustered Grade - OK Grade)/OK Grade]

1%

 

Difference [(Composite Declustered Grade - LUC Grade)/LUC Grade]

5%

 

220

Composites Naïve

3,299

0.005

40

1.57

2.25

Composites Declustered

3,299

0.005

40

1.42

2.38

OK Model

6,184

0.39

4.52

1.53

0.41

LUC Model

51,276

0.05

11.84

1.61

0.93

Difference [(Composite Declustered Grade - OK Grade)/OK Grade]

8%

 

Difference [(Composite Declustered Grade - LUC Grade)/LUC Grade]

14%

 

LUC Model

14,557

0.11

9.18

1.69

0.81

Difference [(Composite Declustered Grade - OK Grade)/OK Grade]

-2%

 

Difference [(Composite Declustered Grade - LUC Grade)/LUC Grade]

-2%

 

Note: CV - coefficient of variation


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-50 Nkran Scatterplots Showing UC Panel Grade (x-axis) versus OK Panel Grade (y-axis)

Swath Plots

Swath plots comparing the model block grades and input composites (declustered and top cut) in spatial increments of northing, easting, and elevation slices. Swath plots globally, as well as for ESTZON domains 210 and 220 are shown in Figure 14-51, Figure 14-52, and Figure 14-53. The plots show that the distribution of block grades honours the distribution of input composite grades. The degree of smoothing is appropriate and accounts for volume variance effects, where block grades should be smoother than point grades. The general trend of the composite grades is reflected in the block models.

Figure 14-51 Nkran GLOBAL Swath Plots and Histogram

Note: OK Panel Model (Black); LUC Model (Orange); Declustered Composites (Blue)

Source: CSA Global, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-52 Nkran ESTZON 210 (Western Sandstone) Swath Plots and Histogram

Note: OK Panel Model (black); LUC Model (orange); Declustered Composites (blue)

Source: CSA Global, 2021

Figure 14-53 Nkran ESTZON 220 (Central Sandstone) Swath Plots and Histogram

Note: OK Panel model (black); LUC model (orange); Declustered composites (blue)

Source: CSA Global, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

LUC Validation

In addition to the statistical and visual validation steps outlined above, the LUC estimate was subject to some additional checks. These included:

Figure 14-54 Nkran Scatterplots Showing Mean LUC Grade of SMUs (x-axis) versus UC Grade (y-axis) Both at a Zero Cut-off. ESTZON 210 (Left) and ESTZON 220 (Right).

Source: CSA Global, 2021

Figure 14-55 Nkran Grade (Left) and Tonnage Curves (Right) for ESTZON 210 with UC Model in Red and LUC in Green

Source: CSA Global, 2021

14.3.6 Classification of Mineral Resources

The Mineral Resource is classified as Indicated and Inferred based upon an assessment of geological understanding of the deposit, geological and mineralization continuity, drill hole spacing, quality control results, search and estimation parameters, and an analysis of available density information.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The Nkran deposit shows good continuity of mineralization within well-defined geological constraints, particularly within the Western Sandstone domain which is has the highest grade and dominant gold metal deportment. Drill holes are located at a nominal spacing of 25 x 25 metre sections extending out to 50 metres on the peripheries of the deposit. The drill spacing is sufficient to allow the geology (and associated mineralization) to be modelled into coherent wireframes for each domain. Reasonable consistency is evident in the orientations, thickness, and grades of the mineralized zone, as defined by Indicator Kriging.

Indicated Mineral Resources were informed by Slope statistics and average distance of samples and generally is defined where drilling is approximately 40 x 40 metre. The remaining material above a wireframe surface of the conceptual Whittle pit shell was classified as Inferred Mineral Resources. Figure 14-56 and Figure 14-57 show the final classified block model in plan view and 3D view.

Figure 14-56 Nkran Cross-section View of Classified Grade Model, Constrained within Nominal US$1,600/oz Au Pit Shell (Blue Outline) Bounded by the June 2020 Mining Surface (Black Outline)

Source: CSA Global, 2021


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-57 Nkran 3D View of Classified Grade Model, View Towards NW. Nominal US$1,600/oz Pit Shell Shown in Blue

14.3.7 Reasonable Prospect of Eventual Economic Extraction

The Nkran mineralization is assumed amenable to open pit mining, and milling and recovery through CIL gold processing, and was evaluated for reasonable prospects for eventual economic extraction by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™. The assumptions used in preparing the conceptual pit, include mining and processing costs, metallurgical recovery, metal price and general and administrative costs, and are shown in Table 14-27 and approximately correspond to the 0.50 g/t Au Mineral Resource cut-off. See "Cautionary Note about Mineral Resources".

Table 14-27 Nkran Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.54 - 2.39

Mining Cost Incremental (US$/Vertical 6m)

0.0114 - 0.0197

Mill Feed Transport (US$/tonne)

0.84

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.3.8 Mineral Resource Statement

The Nkran Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014. The Qualified Person is, Malcolm Titley, MAIG, MAusIMM who is a Principal Consultant of CSA Global. The effective date of the Mineral Resource estimate is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-28.

Table 14-28 Nkran Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured na na na na
Indicated 0.5 12,119 2.09 814
Measured & Indicated 0.5 12,119 2.09 814
Inferred 0.5 1,335 2.23 96

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.54/t to $2.39/t mining costs

c. $0.84/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

The grade tonnage curve for all mineralization for the Nkran deposit is presented in Figure 14-58.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-58 Nkran Grade-Tonnage Curve - All Mineralization

Source: CSA Global, 2021

14.3.9 Factors That May Affect the Mineral Resource Estimate

Other that what is discussed in other sections of this Report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, include mining, metallurgical, and infrastructure are well understood according to the assumptions presented in this Report.

The current Mineral Resource estimate carries moderate uncertainty and risk. The risk is principally related to the indicator mineralization interpretation. The geological wireframes, which act as bounding volumes within which mineralization is defined by Indicator Kriging, have been modelled to have a high degree of continuity along strike. If the continuity along strike is not as great as has been modelled, there is a risk of overstatement of metal.

The choice of Indicator Kriging to generate the mineralization volumes models is dependent on the relationship/comparability between the grade control and exploration data. In some areas there are very significant differences, which if persistent with depth, will result in significant variance between predicted and actual in the ground volumes. This has the largest impact of any of the risk factors on tonnage.

It was noted during the threshold selection in 2018 that the accuracy of the exploration data in prediction of grade and mineralization volume was low in some areas when compared to the GC dataset. Additional drilling in advance of mining will be required to reduce the risk.

It is important to note that the full depth and extent of the Nkran PFS Open Pit shell is significantly influenced by a zone of high grade gold mineralization (centred on 611,815E, 700,615N and 765 Elevation) which is considered high risk Indicated. The QP for the Nkran MRE believes it is critical to conduct an infill drilling program to de-risk this high grade zone, as any changes to the gold tenor and geometry of this high grade will have a significant impact on the economics of the proposed PFS Open Pit. A sensitivity study was completed by Galiano which demonstrated the extent of this risk by delivering different pit depths and extents.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.4 Akwasiso Mineral Resource Estimate

The Akwasiso Mineral Resource was previously estimated and reported in 2019 by CSA Global as part of the 2020 Asanko Gold Mine NI 43-101 technical report. The Mineral Reserve, as defined by Akwasiso Cut 2 pit design based on 2019 Mineral Resource, was depleted in March 2021.

Mining at Akwasiso to 2021 demonstrated that the mineralization is still open in all directions and extends beyond the final depleted pit surface.  Infill and step-out drilling program was subsequently designed and executed by Asanko Exploration team with the goal to update the geology and Mineral Resource model below the depleted pit surface. The 2021 drilling defined the boundary of the mineralization with adequate data density to define a Mineral Resource.

14.4.1 Database

The current drillhole database used to support the resource estimate now consists of 439 exploration drillholes totalling 46,232 meters and 3,320 grade control drillholes totalling 48,431 metres (Table 14-29). The cut-off date of drilling data is February 2, 2021, for exploration drillholes and December 5, 2020, for GC drillholes.

Table 14-29 Akwasiso Exploration and Grade Control Drill Holes Used In 2021 Modelling And Grade Estimation

Exploration Holes

DDH

RC

RCD

Total

Number of Holes

60

332

47

439

Metres Drilled

1,293

24,397

10,542

46,232

Grade Control Holes

RC

 

 

 

Number of Holes

3,320

 

 

 

Metres Drilled

48,431

 

 

 

Since the resource model in 2019, an additional 30 exploration and infill holes were drilled by Asanko to upgrade the remaining Mineral Resources below Cut 2 pit design for evaluation of the economic viability of additional pushback. In addition, 178 exploration holes drilled by Resolute between 1996 and 2000 but not used in the 2019 Mineral Resource estimate were included in the current Mineral Resource drill hole database.

The exploration holes were drilled at approximate 20 to 40 metre spacing, with an average hole depth of 105 meters. GC holes were drilled at regular 10 x 5 metre spacing with an average hole depth of 15 meters. Figure 14-59 illustrates the overall coverage of the Exploration drilling.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-59 View of Akwasiso Exploration Drillholes

Note: 2020 November EOM Pit Topography; $1500 Pit Shell (Preliminary)

14.4.1.1 Verification of Exploration Data

Eric Chen, P. Geo., is the QP for the Akwasiso Mineral Resource estimate and has conducted data verification to assure the accuracy, completeness, and suitability of the exploration and grade control data for Mineral Resource estimation.

Extracted drillhole data were received from Asanko site in comma-delimited csv format. The QP worked closely with the site database and exploration team to conduct further data verification to ensure that data entries in all the drillhole tables were free of error and consistent before the data was accepted for resource estimation. The verification process is completed with assistance of various built-in tools in 3D geological modelling software programs or generic data processing program (such as Excel), and has included, but not limited to, checking and correcting duplicate records, drillhole interval overlap, drillhole depth mis-match, abnormal collar location, downhole surveys, erroneous assay values, etc.

Resolute drillholes were not included in 2019 resource estimation because the drill hole collar coordinates were in a mine grid different from the Asanko grid. The Asanko Mine Survey team subsequently established grid transformation parameters for 178 Resolute drillholes. The transformed Resolute drillholes were verified to have good comparison with topography and Asanko Exploration and GC drillhole intercepts of geology and mineralization. Statistical comparison with Asanko and Resolute assays within 5 metres of each other ("Twin-hole" analysis) shows a negative bias for Resolute assays relative to Asanko assays (Figure 14-60).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-60 Akwasiso QQ Plots of Resolute and Asanko Drillhole Assays at < 5 m Distance

14.4.1.2 Verification of Grade Control Data

"Twin-hole" analysis was conducted by pairing Akwasiso GC and Exploration RC and DDH assays at <5 metres separation distance. Figure 14-61 shows grade distributions between GC and Exploration DDH assays are similar below 2.5 g/t Au. A global statistical discrepancy is indicated between GC and Exploration RC assays, but it was not conclusive which data is biased.

Figure 14-61 Akwasiso QQ Plots of GC and Asanko Exploration Drillhole 1.5 m Composites at < 5 m Distance


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Field duplicate samples of the GC drillholes were also reviewed to assess the suitability of GC samples for resource estimation. Considerable variation of grades of duplicate sample pairs is observed, which indicates a possible precision issue in individual samples but when duplicates are grouped and statistically compared to original samples grouped in large volume, the two data set show identical statistical properties (Figure 14-62).

Figure 14-62 Akwasiso QQ Plots of GC Field Duplicate Assays vs. Original Assays

Mine lab QA/QC and performance was independently reviewed and verified by Dr. Dick Minnitt in November 2020. Duplicates, CRMs, and Blanks data supplied by the mine lab were analyzed and Dr. Minnitt concluded that there was no bias in the duplicates and overall accuracy was acceptable, consistently high standard of laboratory cleaning practice between assays, and CRMs behaved well in general. The QP has reviewed and accepted Dr. Minnitt's conclusion.

Some discrepancy was observed between Asanko and Resolute exploration assays and between Asanko GC and Exploration drillhole assays, with Resolute and GC assays on the slightly lower side. Although the cause of these discrepancies is not fully understood at time of this writing, the QP is of the opinion that using Resolute and GC data is of low risk to Akwasiso Mineral Resource and that incorporating them in the estimation and calibrating the resource model to grade control would result in slightly conservative estimate of the grade.

14.4.2 Geological Models

The geological model for Akwasiso was interpreted and modelled by Asanko exploration team based on the exploration drilling and was constructed using Leapfrog software and includes:

1. Lithology model

2. Oxidation model

3. Shear model

4. Mineralization model


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.4.2.1 Lithology, Oxidation and Shear/Fault Model

The various lithologies were interpreted directly from drillhole logging. A series of shear surfaces and two bounding shears were modelled and used as guides or constraints in modelling of the mineralization. Simple weathering surfaces were constructed from the exploration drillhole logging for the bases of complete oxidation and the top of fresh rock. The two surfaces divided weathering into three oxidation volumes: Oxide (strongly to moderately oxidized), Transitional (weakly oxidized) and Fresh (fresh rock) material types. The oxidation model represents different levels of weathering for material type categorization and density modelling purpose Lithology, shears, and weathering models are shown in Figure 14-63 and Figure 14-64 and are summarized in Table 14-30.

Figure 14-63 Plan and Sectional View of Akwasiso Lithology, Shear and Oxidation Model

Figure 14-64 Sectional View of Akwasiso Oxidation Model


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.4.2.2 Mineralization Model

Movement indicators within the shear fabric indicate that the last deformational event is likely transpressional, with a sinistral sense of movement. This deformational event is believed to produce the structural fabric and pathways for Au mineralization, with the best mineralization occurring in the strain shadow zones of the "plug-like" granite body (B&S Geological, 2019).

Mineralization is associated with increased carbonate quartz veining, quartz flooding in the felsic porphyry, arsenopyrite, sericite, and chlorite alteration. Higher grade intersections occur at the margins of the sandstone with the granite. The other mineralized envelope is a stockwork of extension veins along a shear zone to the west occurring in a sandstone formation.

The 3D model of Mineralization is based on a geological framework of logged and modelled geology, constraining shear, and drillhole assays at a nominal 0.2~0.3 g/t threshold. The interpretation was conducted in both 2D and 3D, and the selection of drillhole intercepts may occasionally include materials lower than target grade threshold to honour the geological trend and maintain the continuity of the 3D shapes. GC drillholes were considered but the exploration drillhole took precedence when in conflict. Structural trends were used in 3D solid generation process in Leapfrog. The mineralization model comprises eleven individual domain wireframes, three of which, 100, 210 and 310, are the most significant in size and grade. The mineral domains are shown in Figure 14-65 and Figure 14-66.

All lithology, oxidation, and mineralization models are summarized in Table 14-30.

Figure 14-65 Plan and Sectional View of Akwasiso Mineralization Model


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-66 Sectional View of Akwasiso Mineralization Model

Table 14-30 List of Akwasiso Geological Models and Codes

Model Type

Model Name

Code

Original File Name

Effective Date

Lithology

Central Sandstone

22

Litho_Model_2020 - Central_SS1.dxf

2020-09-25

Lithology

Central Shale 3

31

Litho_Model_2020 - Central_Shale3.dxf

2020-09-25

Lithology

Eastern Sandstone 1

23

Litho_Model_2020 - Eastern_SS1.dxf

2020-09-25

Lithology

Eastern Sandstone 2

24

Litho_Model_2020 - East_SS2.dxf

2020-09-25

Lithology

Granite

11

Litho_Model_2020 - Granite.dxf

2020-09-25

Lithology

Skinny Granite

12

Litho_Model_2020 - Skinny_Granite.dxf

2020-09-25

Lithology

Western Sandstone

21

Litho_Model_2020 - Western_SS1.dxf

2020-09-25

Lithology

Background Sediments

90

materials outside litho model and under topo

2020-09-25

 

 

 

 

 

Oxidation

Fresh

4

FRESHtr.dm

2020-02-24

Oxidation

Transitional

3

TRANStr.dm

2020-02-24

Oxidation

Oxide

2

OXtr.dm

2020-02-24

 

 

 

 

 

Mineralization

West Domain 1

310

SIM_DOMs02_wss01.00t

2020-12-12

Mineralization

West Domain 2

320

SIM_DOMs02_wss02.00t

2020-12-12

Mineralization

West Domain 3

330

SIM_DOMs02_wss03a.00t

2020-12-12

Mineralization

West Domain 4

340

SIM_DOMs02_wss03b.00t

2020-12-12

Mineralization

West Domain 5

350

SIM_DOMs02_wss04.00t

2020-12-12

Mineralization

Granite Domain

100

SIM_DOMs_Sim_GR.00t

2020-12-15

Mineralization

Central Domain 1

210

SIM_DOMs_Sim_Sed01.00t

2020-12-15

Mineralization

Central Domain 2

220

SIM_DOMs_Sim_Sed02.00t

2020-12-15



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Model Type

Model Name

Code

Original File Name

Effective Date

Mineralization

Background Seds Domain

900

SIM_DOMs_Sim_WST.00t

2020-12-15

Mineralization

East Domain 1

410

SIM_DOMs02_ess01.00t

2020-12-12

Mineralization

East Domain 2

420

SIM_DOMs02_ess02.00t

2020-12-12

14.4.3 Exploration Data Analysis

Drillhole samples are coded by lithology, oxidation, and mineralization models for statistical analysis. Exploratory data analysis was carried out for both individual and combined geological features. The mineralization model provides the best domain to distinguish different grade populations of the deposit (Figure 14-67).

Figure 14-67 Log Probability Plot of Akwasiso Exploration Drill Hole Assays Au Grade by Mineralization, Oxidation, and Lithology

Note: (*Code 0 in Domain plot represent samples outside the mineralization domains (Domain 900))

14.4.3.1 Gold Grade Capping/Outlier Restrictions

Anomalous high grade Au assays are present in the drillhole samples, with maximum grade of 115.2 g/t in exploration drillholes.

High grade samples were treated in two steps. The first step was to top-cut all assays at 25g/t Au before compositing. The second step was to apply additional capping on composite grades at varied thresholds by mineralization domain in the estimation process. It was deemed necessary to top-cut the raw assays before compositing due to some high-grade samples of longer than average length.

The top-cut threshold grades are assessed by mineralization domains, with histogram and log probability graphs of the drillhole assays, consideration of effect on mean-variance, reasonable metal loss and the general grade behaviour at the nearby mined deposits (example in Figure 14-68). The comparison of sample statistics before and after top-cutting is presented in Table 14-31 for exploration assays and Table 14-32 for GC assays.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-68 Assays Log Probability Plots of Exploration Drill Holes by Domain


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-31 Akwasiso Summary Statistics of Mineralization Domain Raw and 25 g/t Au Top-Cut Assays of Exploration Drill Holes

 

AU_PPM

AUCUT25

AUCUT25

Domain

Count

Mean

CV

Max

Top-
cut
(g/t) Au

# Cut

Mean

CV

Max

Metal
loss

100

10,283

0.86

3.1

115.2

25

16

0.83

2.53

25

-3%

210

1,536

1.49

3.63

93.08

25

14

1.28

2.72

25

-14%

220

620

0.2

3.55

11.3

25

0

0.2

3.55

11.3

0%

310

1340

1.72

2.45

75.45

25

4

1.6

1.71

25

-7%

320

119

2.43

2.15

37.76

25

1

2.32

1.98

25

-4%

330

89

0.6

1.51

4.39

25

0

0.6

1.51

4.39

0%

340

169

0.48

3.63

17

25

0

0.48

3.63

17

0%

350

261

0.68

3.8

38.31

25

1

0.63

3.13

25

-6%

410

80

2.33

2.07

24.88

25

0

2.33

2.07

24.88

0%

420

191

0.83

2.24

14.64

25

0

0.83

2.24

14.64

0%

900

23152

0.09

11.45

82.2

25

5

0.08

7.87

25

-7%

Note: AU_PPM - raw assays; AUCUT25 - top-cut assays

Table 14-32 Akwasiso Summary Statistics of Mineralization Domain Raw and 25 g/t Au Top-Cut Assays of Grade Control Drill Holes

 

AU_PPM

 

AUCUT25

Domain

Count

Mean

CV

Max

Top-
cut (g/t) Au

# Cut

Mean

CV

Max

Metal loss

100

18,785

0.97

2.95

183.2

25

28

0.94

2.37

25

-2%

210

2,479

0.88

3.99

136

25

3

0.83

2.65

25

-6%

220

1225

0.39

3.02

18.48

25

0

0.39

3.02

18.48

0%

310

2521

1.45

1.97

68.4

25

4

1.42

1.7

25

-2%

320

609

1.67

2.61

37.76

25

3

1.63

2.51

25

-2%

330

0

0

-

-

25

0

0

-

-

-

340

317

0.3

3.93

17.44

25

0

0.3

3.93

17.44

0%

350

294

0.41

3.09

15.96

25

0

0.41

3.09

15.96

0%

410

287

1.62

2.71

59.72

25

1

1.5

2.04

25

-7%

420

303

0.84

3.15

38.84

25

1

0.8

2.58

25

-5%

900

19995

0.19

11.36

204.8

25

8

0.17

6.14

25

-10%

Note: AU_PPM - raw assays; AUCUT25 - top-cut assays

14.4.3.2 Composites

The dominant sample length is 1.0 metre for exploration drillhole samples and 1.5 meters for GC hole samples. There is no obvious trend of grade distribution by the length of the samples.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The exploration and GC drillhole samples are composited from collar to toe at 1.5 metre equal length intervals for uniform support. Residual of less than half of the composite length are added to the last full composite. Drillhole traces without sample or missing assays are ignored. The composites are coded by the mineralization domain wireframes (majority rule). Assays are top cut prior to compositing. Composite grade was calculated from top-cut assays (AUCUT25), and further capped by the varied thresholds by mineralization domain (Table 14-33). Composite capping thresholds were evaluated using the same method as used for assays capping (example in Figure 14-69).

Figure 14-69 Log Probability Plot of Akwasiso Exploration Drill Hole 1.5 m Composite Au Grade by Mineralization Domain


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-33 Akwasiso Composite Au Statistics of Exploration and GC Drillholes

 

AUCAP EXP 1.5m Composite

 

AUCAP GC 1.5m Composite

 

Domain

Count

Mean

CV

Max

Count

Mean

CV

Max

100

7,024

0.81

2.03

25

18,785

0.94

2.37

25

210

1,054

1.25

2.24

25

2,479

0.83

2.65

25

220

434

0.23

2.86

6.42

1,225

0.38

2.71

10

310

909

1.56

1.4

16.82

2,495

1.55

1.61

25

320

82

2.16

1.64

16.71

542

2.18

2.11

25

330

60

0.58

1.34

3.34

0

0

-

-

340

152

0.41

2.61

6.5

317

0.28

3.17

10

350

220

0.54

2.21

10

294

0.39

2.68

10

410

55

1.97

1.82

15

287

1.44

1.88

15

420

141

0.73

1.92

9.76

303

0.75

2.14

10

900

17,836

0.08

6.26

21.67

20,088

0.14

6.45

25

Note: (the "majority" rule of composite domain coding may result in the mean of small zones not consistent with raw assays)

14.4.3.3 Boundary Analysis

The boundary condition between the mineralization domains and between oxidation domains was assessed through visual inspections and contact graph analysis. The grades show sharp contact between the mineralization domain and the non-mineralized background. Between some mineralization domains that share common boundary, for example 100 - 210, the grade showed smoother transition within limited distance across the contact, while others showed abrupt change (Figure 14-70). The grades did not show distinct change across the oxidation boundaries (Figure 14-71).

Figure 14-70 Akwasiso Contact Graphs of Drillhole Assays Between Main Mineralization Domains


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-71 Akwasiso Contact Graphs of Drillhole Assays Between Oxidation Domains

14.4.3.4 Variography

Variography was modelled for the main mineralization domains with sufficient samples, including Domain 100, 210, and 310. Correlograms were calculated and modelled with a two-structure exponential/spherical model in Vulcan software. The 1.5 composites of combined exploration and GC drillholes were used for variogram modelling. Robust variogram (correlogram) models were obtained for respective domains that matches well with the observed geology and trends of mineralization (Figure 14-72). The variogram parameters obtained from the three domains were used for other smaller domains with rotation angles adjusted to fit the respective domain (Table 14-34)

Table 14-34 Akwasiso Domain 100, 210, 310 Composite Au Variogram (Correlogram) Parameters

Domain

Type 

Sill

Rotation Angles (Vulcan)

Ranges (m)

Azimuth

Plunge

Dip

Major

Semi

Minor

100

 

Nugget

0.4

-

-

-

-

-

-

Exponential

0.576

169.107

48.59

41

12

15

8

Spherical

0.024

169.107

48.59

41

81

65

15

210*

 

Nugget

0.4

-

-

-

-

-

-

Exponential

0.282

30

0

-60

10.277

21.473

5

Spherical

0.318

30

0

-60

25

10.658

5

310**

 

 

Nugget

0.3

-

-

-

-

-

-

Exponential

0.491

30

0

-75

10

22

3

Spherical

0.209

30

0

-75

32

4

3

Note: * used for domain 220; ** used for 320, 330, 340, 350, 410, 420 (rotation angles adjusted to fit)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-72 3D Visualization of Variogram Ellipses for Akwasiso Domain 100, 210, 310

14.4.4 Estimation/Interpolation Methods

14.4.4.1 Block Model Setup

A block model was constructed in Vulcan software. The model covers the full extent of geology and mineralization models and provides adequate extent to allow pit optimization process. The block size of 5 x 5 x 6 metres was selected. The block size in Z direction was the mining bench height at Akwasiso. The block model setup dimensions are presented in Table 14-35.

Table 14-35 Akwasiso 2021 Resource Model Setup

 

Origin

Minimum

Maximum

Extent (m)

Block Size (m)

# Blocks

Easting

613,820

613,820

614,660

840

5

168

Northing

703,700

703,700

704,420

720

5

144

Elevation

-146

-146

202

348

6

58

The block model was coded with the geological model wireframes by majority rule as shown in Figure 14-73.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-73 Akwasiso Block Assignment of Domain Codes

14.4.4.2 Estimation

Ordinary Kriging (OK) was used for grade estimation. An independent GC model of the same block size was first created using GC data only as reference model in the mined-out area. To ensure that the resource model will reproduce the grade distribution of the reference model, multiple scenarios of estimation parameters were tested to run estimation with exploration data only (EXP Model). The parameters that produced the closest tonnage-grade curve to GC model were selected. The GC composites were then merged with the exploration composites for the final resource estimation (MRE Model) using the selected parameters. The estimation plan is presented in Table 14-36 and illustrated in Figure 14-74. The vein lode type domains used dynamic anisotropic search orientations generated from digitized vein trend surfaces.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-36 Akwasiso Grade Estimation Parameters

Figure 14-74 Illustration of Akwasiso Search Ellipsoid (Domain 100 example)

14.4.4.3 Bulk Density

Bulk density was assigned to the block model based on a combination of lithology and oxidation. Density values were calculated from a small density data set of 48 measurements, only 12 of which are in oxide/transitional zones (Table 14-37).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-37 Akwasiso Bulk Density Values Assigned to Resource Block Model (by Material Type)

Material Type

Bulk Density (t/m3)

Oxide

1.7

Transitional

2.3

Fresh - Granite

2.7

Fresh - Sediments

2.7

14.4.5 Validation

The Akwasiso resource model was calibrated to reference model (GC Model) in the mined-out area. The tonnage-grade comparison of the exploration model (EXP Model) and GC Model is presented in Figure 14-75. The resource model was also validated through cross-checking with an independent conditional simulation model produced by Gold Fields in September 2020. The two models compared well in the common volume between the as-mined topo surface and $1600 resource pit shell (Table 14-38).

Figure 14-75 Akwasiso Tonnage-Grade Comparison of EXP Model and GC Model in Mined-out Area

Table 14-38 Comparison of Akwasiso Resource Model with Simulation Model (Between June 30 2021 Topography and $1600 Resource Pit Shell)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.4.5.1 Swath Plots and Global Statistical Comparisons

Statistical comparison of the model and input data was also conducted to ensure global and local unbiasedness. Swath plots were created by comparing the model block grades and input in spatial increments in northing, easting, and elevation slices throughout the deposit Figure 14-76.

The plots show that block grades (Indicated) are smoother and follow the trend of input composite grades, which is the expected result of estimation, with block grades showing lower overall variance. The global mean of the model Au grade also compared well with composite Au grade.

Figure 14-76 Akwasiso Swath Plot by Northing and Elevation for Block and Composite Au (g/t) of Main Domains

14.4.5.2 Visual Inspection

The block model was visually reviewed in 2D in sections and level plans, and in 3D to ensure the block estimates are supported by the surrounding composites. In general, the estimates compare well with the input data.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.4.6 Classification of Mineral Resources

Akwasiso deposit shares the common geological features as other well studied deposits on the Nkran structural trend.

Drill spacing is the primary factor to define resource classification and only Indicated and Inferred resources are defined at Akwasiso. The spacing criteria at to separate the resource classes at Akwasiso are based on the variogram ranges and experiences of mining at adjacent Nkran deposit.

Nominal drill spacing is determined with a widely accepted mathematic approximation based on calculated average distance of the closest three drillholes to the block. The classification criteria are summarized in Table 14-39.

Table 14-39 Akwasiso 2021 Resource Classification Criteria

Classification
Category

Drill Spacing (m)

3-Hole Average
Distance (m)

Measured (1)

No Measured classification defined

-

Indicated (2)

40 x 40 (m) drill spacing

<= 28

Inferred (3)

80 x 80 (metre) drill spacing, or nearest DH < 40 metre distance

<= 56

Drilling coverage at Akwasiso was relatively high. Although a block can be classified as Indicated if drillhole spacing was equal or closer than 40 metres, 50% of the Indicated materials were covered by 20 metre or closer drillhole spacing (Table 14-40). Block classification is shown in Figure 14-77.

Table 14-40 Akwasiso 2021 Resource Drillhole Coverage Summary

Class

Spacing

Tonnes

Au Oz

Indicated

<20 metre spacing

48%

50%

20 - 30 metre spacing

38%

36%

30 - 40 metre spacing

14%

14%

Inferred

>60 metre spacing

6%

9%

30 - 40 metre spacing

4%

3%

40 - 60 metre spacing

90%

88%



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-77 Illustration of Akwasiso 2021 Resource Classification and Block 3-Hole Average Distances

Note: Showing preliminary optimized pit shell at $1600/oz price

14.4.7 Reasonable Prospect of Eventual Economic Extraction

The Akwasiso mineralization is assumed amenable to open pit mining and milling and recovery through CIL gold processing. The reasonable prospect for eventual economic extraction of the Mineral Resources was tested by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™ software at US$1600/oz gold price with all the materials of Indicated and Inferred classes and with a reporting cut-off grade of 0.5 g/t Au. The pit optimization parameters are listed in Table 14-41. See "Cautionary Note about Mineral Resources".


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-41 Akwasiso Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.004 - 1.571

Mining Cost Incremental (US$/Vertical 6m)

0.0043 - 0.0146

Mill Feed Transport (US$/tonne)

2.14

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55

14.4.8 Mineral Resource Statement

The Akwasiso Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

The Qualified Person is Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-42. The estimated grades and tonnages for multiple cut-offs are shown in Figure 14-78.

Table 14-42 Akwasiso Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured   na na na
Indicated 0.5 1,655 1.31 69
Measured & Indicated 0.5 1,655 1.31 69
Inferred 0.5 158 1.46 7

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.004/t to $1.571/t mining costs

c. $2.14/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-78 Akwasiso Tonnage - Grade Curve for Indicated Mineral Resources

14.4.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.

The current Mineral Resource estimate carries moderate uncertainty and risk. The risk is mainly related to the statistical gaps between the exploration and GC assays as discussed in the previous sections. Even though the resource model was calibrated with GC model, and the GC samples, which are on the lower side of the comparison, were used in estimation, the predicted tonnage and grade in areas beyond the influence of GC data may be different from what the future GC may define. Reconciliation shall be closely monitored and further studies on GC sampling, assaying, etc. in order to fully understand the discrepancy between exploration and GC assays shall continue.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.5 Dynamite Hill Mineral Resource Estimate

The Dynamite Hill Mineral Resource was previously estimated by CSA Global and reported as part of the Asanko Gold Mine NI 43-101 2017 technical report. The Mineral Reserve, based on the 2017 Mineral Resource, was depleted before the effective date of the Asanko Gold Mine 2019 technical report.

Mining at Dynamite Hill between November 2017 to August 2019 demonstrated that the mineralization is still open in all directions and extends beyond the final depleted pit surface.  Infill and step-out drilling program was subsequently designed and executed by Asanko Exploration team with the goal to update the geology and Mineral Resource model below the depleted pit surface. The 2021 drilling defined the boundary of the mineralization with adequate data density to define a Mineral Resource.

14.5.1 Database

The current drillhole database used to support the resource estimate now consists of 170 exploration holes totalling 24,692 metres and 872 grade control holes totalling 28,667 metres (Table 14-43). The cut-off date of drilling data is October 13, 2021.

Table 14-43 Dynamite Hill Exploration Drill Holes

Exploration Holes

DDH

RC

RCD

Total

Number of holes

12

140

18

170

Metres drilled

2,502

17,698

4,492

24,692

Grade Control Holes

RC

 

 

 

Number of holes

872

 

 

 

Metres drilled

28,667

 

 

 

Twenty-seven of the RC/RCD holes were completed between August and October 2021. Exploration drilling in 2021 brought the drillhole density to nominal 25 x 25 metre spacing below the mined pit surface. All GC holes were completed between 2017 and 2019 and were drilled at approximately 10 x 5-10 metre spacing.

Figure 14-79 Dynamite Hill Exploration and GC Drill Holes

Note: Exploration hole samples shown as crosses and GC holes as solid lines)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

All drilling methods, sample collection methods and data quality processes and results are described in the relevant sections of this report.

14.5.1.1 Verification of Exploration Data

Eric Chen P. Geo., is the QP for the Dynamite Hill Mineral Resource estimate and has conducted data verification to assure the accuracy, completeness, and suitability of the exploration and grade control data for Mineral Resource estimation.

Extracted drillhole data were received from Asanko site in comma-delimited csv format. The QP worked closely with the site database and exploration team to conduct further data verification to ensure that data entries in all the drillhole tables were free of error and consistent before the data was accepted for resource estimation. The verification process is completed with assistance of various built-in tools in 3D geological modelling software programs or generic data processing program (such as Excel), and has included, but not limited to, checking and correcting duplicate records, drillhole interval overlap, drillhole depth mis-match, abnormal collar location, downhole surveys, erroneous assay values, etc. Verification of Grade Control data was conducted in the same manner as exploration data.

14.5.2 Geological Models

The geological model was interpreted and modelled by Asanko exploration team with incorporation of 2017-2019 grade control drilling and new 2021 exploration drilling. The geological model was constructed using Leapfrog Geo software and includes:

1. Lithology model (LITHO)

2. Oxidation model (OX)

3. Mineralization model (DOMAIN)

14.5.2.1 Lithology and Oxidation Models

The Dynamite Hill area is underlain by fine to medium-grained greywackes (intermittent strong alterations) intercalated with argillites (phyllites), and intrusions of altered felsic rock (feldspar quartz porphyry/granitoid), quartz veins, and stockworks. Mineralization is hosted within veins and disseminations in and around a granitic intrusive located on the Nkran shear trend.

The lithology is generalized into a granite and a sedimentary rock model. The sedimentary rock model is treated as background rock mass.

The oxidation model represents different levels of weathering and is used for material-type categorization and density modelling purposes. Simple weathering surfaces are constructed for the base of complete oxidation (BOCO) and the top of fresh rock (TOFR). The two surfaces divided weathering into Oxide (strongly to moderately oxidized), Transitional (weakly oxidized) and Fresh (fresh rock) material types. Oxidation boundaries are based on drill core logging; Away from the drilling the thickness of weathering was maintained parallel to topography. The lithology and oxidation models are shown in Figure 14-80.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-80 Dynamite Hill Lithology and Oxidation Model (Inclined Long Sectional View of Granite Model)

14.5.2.2 Mineralization Model

Gold Mineralization is mostly associated with quartz stockwork hosted within the northwest steeply dipping orebody of strongly altered (chloritic, sericitic, and silicified) wackes, and at the contact between felsic intrusive (granite) and foliated meta-sedimentary rocks.

Modelled 3D granite, logged drillhole lithology, grade control and exploration assays are used to guide the interpretation of three gold mineralization zones at approximate 0.2~0.3 g/t.

The main zone is a single solid body hosted within and around the granite intrusive and contains most of the gold in the Dynamite Hill deposit. Two smaller zones are in the hanging wall above the main zone, and all of them are sub-parallel to the main regional northeast trending northwest steeply dipping structure. The gold mineralized zones are shown in Figure 14-81 and Figure 14-82.

All lithology, oxidation, and mineralization models are summarized in Table 14-44.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-81 Sectional View of Dynamite Hill Mineralization Model

Figure 14-82 Long Sectional View of Dynamite Hill Main Mineralization Model

Note: * Main Zone shown as solid in light red colour


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-44 List of Dynamite Hill Geological Models and Codes

Model Type

Model Name

Code

Original File Name

Effective Date

Mineralization

Main Zone

10

Minzone_1_v041121.00t

2021-11-04

Mineralization

Minzone01

11

Minzone_2_v041121.00t

2021-11-04

Mineralization

Minzone02

12

Minzone_3_v041121.00t

2021-11-04

Mineralization

Background Zone

9

BackgroundZone.00t

2021-11-04

Lithology

Granite

1

gran1_v281021.00t

2021-10-28

Lithology

Granite

1

gran2_v281021.00t

2021-10-28

Lithology

Granite

1

gran3_v281021.00t

2021-10-28

Lithology

Sediments

0

BackgroundZone.00t

2021-11-04

Oxidation

Oxide

1

OX Contacts_v041121.00t (ox-tr contact)

2021-11-04

Oxidation

Transitional

2

OX Contacts_v041121.00t (ox-tr contact)

2021-11-04

Oxidation

Fresh

3

FR Contacts_v041121.00t (tr-fr contact)

2021-11-04

14.5.3 Exploration Data Analysis

Drillhole samples are coded by lithology, oxidation, and mineralization models for statistical analysis. Exploratory data analysis was carried out for both individual and combined geological features.

The probability plots shown in Figure 14-83 show the mineralization model provides the best domain to distinguish different grade populations of the deposit. Different lithologies or oxidation within the same mineralization domain do not show significant statistical differences.

Figure 14-83 Log Probability Plot of Dynamite Hill Exploration Drill Hole Assays Au Grade by Mineralization, Oxidation, and Lithology Model

Note: (*in lithmod figure, code 1 is granite and code 2 is sediments)


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.5.3.1 Gold Grade Capping/Outlier Restrictions

Anomalous high grade Au assays are present in the drillhole samples, with maximum grade of 107.28 g/t Au in exploration drillholes and 632 g/t Au in grade control drillholes.

Top-cutting threshold grades are assessed by mineralization domains with histogram and log probability (disintegration) graphs of the drillhole assays (Figure 14-84), with consideration of reasonable metal loss and the general grade behaviour at the nearby mined deposits. Assays higher than the threshold grades are capped to the respective threshold grades for each domain. The comparison of sample statistics before and after top-cutting is presented in Table 14-45 for exploration assays and Table 14-46 for GC assays.

Figure 14-84 Dynamite Hill Top-cut Analysis of Exploration Drill Holes Au Assays

Table 14-45 Summary Statistics of Dynamite Hill Mineralization Domain Raw and Top-Cut Assays of Exploration Drill Holes

 

Sample Assays AU Grade (g/t)

 

Top-cut Assays AUCUT (g/t)

Domain

Count

Mean

CV

Maximum

Top-cut
(g/t) Au

#
Samples
Cut

Mean

CV

Maximum

Metal
loss

9

19,821

0.04

6.13

21.04

3

18

0.04

3.71

3

7%

10

3,130

1.57

2.9

107.28

30

10

1.47

2.13

30

7%

11

185

0.74

2.04

12.37

4

7

0.62

1.54

4

16%

12

383

0.46

1.54

7.89

3

6

0.44

1.32

3

4%



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Table 14-46 Summary Statistics of Dynamite Hill Mineralization Domain Raw and Top-Cut Assays of Grade Control Drill Holes

 

Sample Assays AU Grade (g/t)

 

Top-cut Assays AUCUT (g/t)

Domain

Count

Mean

CV

Maximum

Top-cut
(g/t) Au

#
Samples
Cut

Mean

CV

Maximum

Metal loss

9

10,293

0.07

3.98

11.08

3

14

0.07

3.16

3

4%

10

8,368

1.72

4.79

632

30

17

1.57

1.86

30

8%

11

94

0.67

1.69

9.4

4

2

0.61

1.24

4

9%

12

0

-

-

-

-

-

-

-

-

-

14.5.3.2 Composites

The dominant sample length is 1.0 metre for exploration drill hole samples and 1.5 meters for GC drill hole samples. There is no obvious trend of grade distribution by the length of the samples.

The exploration drillhole samples are composited from collar to toe at 1.5 metre equal length intervals, to maintain the uniform support as the grade control drillhole sample length (1.5m). Residual of less than half of the composite length are added to the last full composite. The residuals are mostly present at the end of drillholes. Drillhole traces without samples or missing assays are ignored. The composites are coded by the mineralized domain wireframes (majority rule) and the statistics. Assays are top cut prior to compositing. The comparison of composite statistics before (AU_PPM) and after top cutting (AUCUT) is presented in Table 14-47.

Table 14-47 Composite Au Statistics of Dynamite Hill Exploration Drillholes

 

Composite_1.5m AU_PPM

Composite_1.5m AUCUT

 

 

Domain

Count

Mean

CV

Max

Count

Mean

CV

Max

9

14,399

0.04

4.62

10.97

14,399

0.04

3.39

8.05

10

2,105

1.57

2.27

62.06

2,105

1.46

1.74

28.5

11

123

0.73

1.57

6.29

123

0.6

1.22

3.34

12

258

0.46

1.27

5.56

258

0.44

1.08

2.3

Note: Composite AUCUT maximum grade may be different from assays AUCUT due to independent domain coding process

14.5.3.3 Boundary Analysis

The boundary condition between the mineralization, oxidation, and lithology was assessed through visual inspections. The grades show sharp contact between the mineralization domain and the non-mineralized background. Within the mineralized domain, the grades do not show distinct change across the lithology boundaries or oxidation boundaries.

14.5.3.4 Declustering

Conditional simulation (Sequential Gaussian Simulation, or SGS) is used to model the main mineralized domain. Normal Score transformation of the Au grade is required for SGS process, which requires the de-clustered distribution of the composite Au grade for the domain to map the normal score transformation. Cell de-clustered method is used. Several de-clustering cell sizes were tested on GC samples and exploration composites separately. The final cell size of 6 x 15 x 15 metre for GC samples, and 8 x 20 x 20 metre for exploration composites was selected and applied, primarily based on the respective data spacing and review of mean vs. cell size graph (Figure 14-85). The de-clustered statistics are compared to raw composites and presented in Table 14-48.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-85 Cell De-clustered Dynamite Hill Exploration Drillhole Composites Au Mean vs. Cell Size (Main Zone)

Table 14-48 De-clustered and Raw Dynamite Hill Exploration Drillhole Composite Au Statistics Comparison (Main Zone)

 

Comp AU_PPM

Comp AUCUT (decl.)

 

Domain

Count

Min

Max

Mean

CV

Count

Min

Max

Mean

CV

Metal loss

Comp AU_PPM

2,105

0.005

62.06

1.57

2.27

2,105

0.005

28.53

1.41

1.75

-10%

Comp AUCUT

2,105

0.005

28.53

1.46

1.74

2,105

0.005

28.53

1.41

1.75

-3%

14.5.3.5 Variography

Closely spaced GC drill holes depict well the characteristics of short-range continuity of gold grade therefore GC data is merged with exploration composites for variography analysis. As smaller domains (11, 12) do not contain sufficient samples for reliable variography, only the main mineralized domain (10) is modelled.

The variogram is modelled in Gaussian space with the normal scores transformed from the sample grades in real space. Correlograms are calculated and modelled with a two-structure exponential model using SAGE™ 2000 software. A robust variogram (correlogram) model is obtained for Domain 10 that matches well with the observed geology and trends of mineralization (Figure 14-86 and Figure 14-87, Table 14-49).


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Figure 14-86 Dynamite Hill Domain 10 Composite Au Normal Score Variogram (Correlogram) Parameters

Figure 14-87 Example of Domain 10 GC Sample and Exploration Composite Au Normal Score Variogram (Correlogram)


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Table 14-49 Dynamite Hill Domain 10 Composite Au Normal Score Variogram (Correlogram) Parameters

Domain

 

Type

 

Sill

 

Rotation Angles (Vulcan)

Ranges (m)

Azimuth

Plunge

Dip

Major

Semi

Minor

100

Nugget

0.222

-

-

-

-

-

-

Exponential

0.598

18

-4

64

18.4

12.1

6.9

Spherical

0.18

27

-4

-21

81.8

17

40.2

14.5.4 Estimation/Interpolation Methods

14.5.4.1 Block Model Setup

A block model was developed within Vulcan software. The model covers the full extent of updated geology and mineralization models and provides adequate extent to allow potential pit expansion. The block size, at 5 x 5 x 3 metres, is considered the SMU, smallest unit that a mining decision is based on.

A large-scale panel (25 x 25 x 15 metre) is also set up for post-processing of the Domain 10 simulation to localize the simulated grades to the SMU blocks, each panel size being a multiple of the smaller SMU block size.

The block model setup dimensions are presented in Table 14-50 and Table 14-51.

Table 14-50 Dynamite Hill 2021 Resource Model Setup

 

Origin

Minimum

Maximum

Extent (m)

Block Size (m)

# Blocks

Easting

616020

616020

616930

910

5

182

Northing

706520

706520

707430

910

5

182

Elevation

17

17

380

363

3

121

Table 14-51 Dynamite Hill Domain 10 Simulation Model Setup

 

Origin

Minimum

Maximum

Extent (m)

Block Size (m)

# Blocks

Easting

616310

616310

616615

305

1

305

Northing

706760

706760

707110

350

1

350

Elevation

17

17

344

327

1.5

218

The block model was coded according to the geological model wireframes by majority rule as shown in Figure 14-88.


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Figure 14-88 Vertical Sectional View of Dynamite Hill Resource Block Model of Mineralization Domain

14.5.4.2 Estimation

Grade estimation for Dynamite Hill used a combination of localized selective mining unit (LSMU) and Inverse Distance methods. The main domain (10) used LSMU, and all other domains used Inverse Distance to power 3 (ID3). Only exploration drillhole composites were used.

LSMU Estimation

The grade estimation for Domain 10 is a localized, recoverable resource model with grades estimated at a SMU scale of 5 x 5 x 6 metres. The local metal distribution for the recoverable resource was estimated using conditional simulation. The basic workflow used for LSMU model is as follows:

1. Point scale conditional simulation at 1 x 1 x 1.5 metre scale (Sequential Gaussian Simulation)

2. Re-block each realization to selective mining unit (SMU) scale (5 x 5 x 3 metre)

3. Divide the domain into panels (25 x 25 x 15 metre)

4. Calculate the local metal distribution within each panel from SMUs for all realizations at a sequence of cut-off grades

5. Index the SMU blocks by e-type estimates within each panel to represent a local grade distribution

6. Assign grades from the local distribution in increasing sequence to SMUs ranked by the indexed values (e-type estimates).


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The localization is the same approach used for localized uniform conditioning (LUC) which estimates localized SMU grades conforming to the proper grade-tonnage curves as well as maintaining the relative spatial grade distribution pattern indicated by the e-type estimates. The applied estimation differs from LUC by obtaining the local distribution through conditional simulation rather than UC. This maintains the advantages of having a probabilistic conditional simulation model (multiple realization models) while providing a deterministic summary model (one grade per block) to be used for the reporting and optimisation processes.

A total of 50 simulation realizations and the e-type were produced at 1 x 1 x 1.5 metre point scale support, and then each realization and e-type are regularized to 5 x 5 x 3 metre SMU block size. The SGS search parameters are shown in Table 14-52. The SMU blocks are coded with the panel ID (each 25 x 25 x 15 metre panel was assigned a unique ID code) before being exported to csv block model file for post-processing.

The indexing and localization of block grades are completed in Microsoft™ Excel, PowerQuery and processed with DAX language. The localized block model file was then re-imported to Vulcan as the final grade model for Domain 10.

Inverse Distance Estimation

The ID3 was used for grade estimation for Domain 11, 12, and 9. SGS and Inverse Distance (ID3) estimation parameters are summarized in Table 14-52.

Table 14-52 Dynamite Hill Sequential Gaussian Simulation and Inverse Distance (ID3) Estimation Parameters

14.5.4.3 Bulk Density

Bulk density was assigned to the block model based on a combination of lithology and oxidation. The bulk density values are calculated from a total of 66 measurements of drill cores representing the various lithology and oxidation types. The calculated average bulk density values by material types are in line with the bulk densities of adjacent deposits. Densities assigned to the block model are shown in Table 14-53.

Table 14-53 Bulk Density Values Assigned to Dynamite Hill Block Model (by Material Type)

Material Type

Bulk Density (t/m3)

Oxide

1.79

Transitional

1.98

Fresh - Granite

2.70

Fresh - Sediments

2.77



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14.5.5 Validation

Validation of the block model included the validation of the simulation model of the main mineralized domain, statistical comparison of the model and input data, visual inspection, and most importantly the reconciliation with the past production.

14.5.5.1 Validation of Simulation

The simulation was validated at point scale. The point scale realizations reasonably reproduced the statistics of input composites (Figure 14-89 and Figure 14-90). The visual inspection of select realizations in 2D and 3D also show reasonable reproduction of the orientation and ranges of input variogram (Figure 14-91).

Figure 14-89 Dynamite Hill Accuracy Plot of 50 SGS Realizations

Figure 14-90 Dynamite Hill Statistical Comparison of SGS Realizations and Input Composites


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Figure 14-91 Dynamite Hill Plan View of SGS Realization ausim01 Grade

14.5.5.2 Swath Plots

Swath plots were created by comparing the model block grades and input in spatial increments in northing, easting, and elevation slices throughout the deposit (Figure 14-92).

The plots show that block grades (Indicated + Inferred) are smoother and follow the trend of input composite grades, which is the expected result of estimation, with block grades showing lower overall variance.

The global mean comparison presented in Table 14-54.

Table 14-54 Global Stats (at 0 g/t Cut-off grade) Comparison Between Indicated Blocks and Exploration Drill Hole Composites

 

Block Model (Class 2)

Composite_1.5m AUCUT

Domain

Count

Mean

CV

Min

Max

Count

Mean

CV

Min

Max

9

-

-

-

-

-

14,399

0.04

3.39

0.001

8.05

10

24,155

1.35

0.81

0.05

9.77

2,105

1.46

1.74

0.005

28.53

11

1,124

0.67

0.92

0.01

3.25

123

0.6

1.22

0.005

3.34

12

2,224

0.44

0.78

0.005

1.97

258

0.44

1.08

0.005

2.3

14.5.5.3 Visual Inspection

The block model was visually reviewed in 2D in sections and level plans, and in 3D to ensure the block estimates are supported by the surrounding composites. In general, the estimates compare well with the input data.


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-92: Dynamite Hill Swath Plot by Easting, Northing, and Elevation for Block and Composite Au g/t of Domain 10

14.5.5.4 Reconciliation

To evaluate the model performance against the past production, the resource model is compared to the grade control model within the mined-out pit at key cut-off grades. A separate simulation model was also produced with GC samples following similar process as the LSMU model, as an additional check of the resource model within the mined-out pit. Reconciliation results are summarized in Table 14-55.


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Table 14-55 Dynamite Hill Resource Model Reconciliation Summary Within Mined-out Pit

COG = 0

Measured + Indicated

Inferred

Total

Tonnes

Au
(g/t)

Gold (Oz)

Tonnes

Au
(g/t)

Gold
(Oz)

Tonnes

Au
(g/t)

Gold (Oz)

2021 Resource Model

2,058,564

1.48

98,019

10,814,661

0.06

19,471

12,873,225

0.28

117,490

GC Model

1,951,983

1.58

99,436

0

0.00

0

1,951,983

1.58

99,436

GC Sim Model

2,051,851

1.56

102,911

10,755,382

0.05

16,944

12,807,233

0.29

119,855

 

 

 

 

 

 

 

 

 

 

COG = 0.5

Measured + Indicated

Inferred

Total

Tonnes

Au (g/t)

Gold
(Oz)

Tonnes

Au (g/t)

Gold (Oz)

Tonnes

Au (g/t)

Gold (Oz)

2021 Resource Model

1,757,790

1.68

94,661

157,176

1.00

5,038

1,914,966

1.62

99,699

GC Model

1,800,110

1.69

97,982

0

0.00

0

1,800,110

1.69

97,982

GC Sim Model

1,683,437

1.84

99,317

123,340

1.04

4,124

1,806,777

1.78

103,441

 

 

 

 

 

 

 

 

 

 

COG = 0.8

Measured + Indicated

Inferred

Total

Tonnes

Au (g/t)

Gold
(Oz)

Tonnes

Au (g/t)

Gold (Oz)

Tonnes

Au (g/t)

Gold (Oz)

2021 Resource Model

1,395,255

1.94

87,070

79,641

1.38

3,521

1,474,896

1.91

90,591

GC Model

1,533,186

1.87

92,326

0

0.00

0

1,533,186

1.87

92,326

GC Sim Model

1,340,241

2.14

92,169

62,682

1.44

2,900

1,402,923

2.11

95,069

14.5.6 Classification of Mineral Resources

Dynamite Hill deposit shares the common geological features as other well studied deposits on the Nkran structural trend. The control of mineralization is well understood from the previous modelling and mining.

Drill spacing is the primary factor to define resource classification and only Indicated and Inferred resources are defined at Dynamite Hill. The spacing criteria to separate the resource classes are based on the variogram ranges, experiences of mining at Dynamite Hill and other deposits in similar geological settings.

Nominal drill spacing is determined with a widely accepted mathematic approximation based on calculated average distance of the closest three drillholes to the block. The classification criteria are summarized in Table 14-56. See "Cautionary Note about Mineral Resources".

Table 14-56 Dynamite Hill Resource Classification Criteria

Classification Category

Drill Spacing (m)

3-Hole Average Distance (m)

Measured

No Measured classification defined

-

Indicated

40 x 40 drilling (Domain 10)

<= 28.29

35 x 35 drilling (Domain 9, 11, 12)

<= 24.75

Inferred

80 x 80 metre drilling, or nearest DH < 60 metre distance

<= 56.58



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Figure 14-93 Dynamite Hill Block Model 3 - Hole Average Distances and Resource Classification

14.5.7 Reasonable Prospect of Eventual Economic Extraction

The Dynamite Hill mineralization is assumed amenable to open pit mining and milling and recovery through CIL gold processing. The reasonable prospect for eventual economic extraction of the Mineral Resources was tested by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™ software at US$1600/oz gold price with all the materials of Indicated and Inferred classes and with a reporting cut-off grade of 0.5 g/t Au. The conceptual pit parameters are listed in Table 14-57.

Table 14-57 Dynamite Hill Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.025 - 1.647

Mining Cost Incremental (US$/Vertical 6m)

0.0087 - 0.0353

Mill Feed Transport (US$/tonne)

2.35

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55

14.5.8 Mineral Resource Statement

The Dynamite Hill Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

The Qualified Person is Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-58. The estimated grades and tonnages for multiple cut-offs are shown in Figure 14-94.


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Table 14-58 Dynamite Hill Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured na na na na
Indicated 0.5 1,900 1.39 85
Measured & Indicated 0.5 1,900 1.39 85
Inferred 0.5 340 1.26 14

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.025/t to $1.647/t mining costs

c. $2.35/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate

Figure 14-94 Dynamite Hill Tonnage - Grade Curve for Indicated Mineral Resources


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14.5.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.

14.6 Miradani North Mineral Resource Estimate

The Miradani North deposit was mined between 1996 and 2016 by Ukrainians and Russians. The pit is 250 metres long by about 120 metres with a depth of about 60 metres. Most of the oxide mineralization is depleted but the fresh rock remains untouched. No historical data or production record is available from this period. Exploration drilling by Asanko started in 2019, followed by two drilling campaigns in 2020 and 2021. The 2021 drilling was successful in defining the geometry of the mineralization with adequate data density to define the Mineral Resource at Miradani North.

14.6.1 Database

The current drillhole database used to support the resource estimate now consists of 83 exploration holes totalling 19,609 metres (Table 14-59). The cut-off date of drilling data is May 13, 2021.

Table 14-59 Miradani North Exploration Drillholes

Exploration Holes

DDH

RC

RCD

Total

Number of holes

43

8

32

83

Metres drilled

10,453

1,010

8,146

19,609

The exploration holes were planned and drilled at nominal 40 x 40 metre grid. Due to drill rig access limitations, the near-surface portion of the deposit that is directly below the existing pit (water flooded) could not be drilled at the same grid. The current drill plan is show in Figure 14-95 and Figure 14-96.

Figure 14-95 Plan View of Miradani North Exploration Drillholes


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Effective Date: February 28, 2022

Figure 14-96 Sectional View of Miradani North Exploration Drillholes

All drilling methods, sample collection methods and data quality processes and results are described in the relevant sections of this report.

14.6.1.1 Verification of Exploration Data

Eric Chen, P. Geo., is the QP for the Miradani North Mineral Resource estimate and has conducted data verification to assure the accuracy, completeness, and suitability of the exploration data for Mineral Resource estimation.

Extracted drillhole data were received from Asanko site in comma-delimited csv format. The QP worked closely with the site database and exploration team to conduct further data verification to ensure that data entries in all the drillhole tables were free of error and consistent before the data was accepted for resource estimation. The verification process is completed with assistance of various built-in tools in 3D geological modelling software programs or generic data processing program (such as Excel), and has included, but not limited to, checking and correcting duplicate records, drillhole interval overlap, drillhole depth mis-match, abnormal collar location, downhole surveys, erroneous assay values, etc. Two drillholes, TTDD20-029 and TTDD20-050, were removed from resource database due to significant concern of the reliability of their downhole surveys.

14.6.2 Geological Models

The geological model for Miradani North was interpreted and modelled by Asanko exploration team based on the exploration drilling in 2019 - 2021. The geological model was constructed using Leapfrog Geo software and includes:

1. Lithology model

2. Oxidation model

3. Shear/Fault model

4. Mineralization model


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14.6.2.1 Lithology, Oxidation and Shear/Fault Model

The geology of Miradani North deposit is akin to the Nkran deposit in several ways. It is in a dilational jog at the triple junction of NNE-SSW trending regional structures and East-west (080) structures which are underlain by cryptic basement structures.

The stratigraphy is comprised of wackes and intermittent alternating units of sandstones, siltstones, and graphitic shales which are intruded by felsic porphyry. The intrusive unit is about 200 metres long, plunges to the south and up to 100 metre wide at the middle where it was faulted and rotated by a sinistral movement causing shortening and thickening.

The lithology is generalized into a granite and a sedimentary rock model. The sedimentary rock model is treated as background rock mass. Two shear surfaces, hanging wall and footwall, were modelled and are the most significant structures that constrain the overall mineralization.

The oxidation model represents different levels of weathering and is used for material type categorization and density modelling purpose. Simple weathering surfaces are constructed for the base of complete oxidation (BOCO) and the top of fresh rock (TOFR). The two surfaces divided weathering into Oxide (strongly to moderately oxidized), Transitional (weakly oxidized) and Fresh (fresh rock) material types. Away from the drilling the thickness of weathering was maintained parallel to topography (Figure 14-97 and Figure 14-98).

Figure 14-97 Plan View of Miradani North Lithology Model


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Figure 14-98 Sectional View of Miradani North Lithology Model

14.6.2.2 Mineralization Model

The gold mineralization at Miradani North occurs as free gold in veins that are at the sandstone/granitic porphyry contact or in the granite where the veins occur either as stockwork or spiderwebs of 1-3-centimetre-long veinlets. The overall mineralization is controlled by a westward dipping shoot that plunges to the north. The mineralization is controlled by the shape of the intrusive.

The 3D model of mineralization is based on a geological framework of logged and modelled granite intrusive, constraining shear/faults, and drillhole assays at nominal 0.2~0.3 g/t Au threshold. The interpretation was conducted in both 2D and 3D, and the selection of drillhole intercepts may occasionally include materials lower than target grade threshold to honour the geological trend and maintain the continuity of the 3D shapes. Structural trends were used in 3D solid generation process in Leapfrog. The model is a single solid orebody hosted within and around the main granite intrusions and is sub-parallel to the main regional northeast trending northwest steeply dipping structure (Figure 14-99 and Figure 14-100).

All lithology, oxidation, and mineralization models are summarized in Table 14-60.


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Figure 14-99 Plan View of Miradani North Lithology Model

Note: (* Minzone mineralization domain shown in yellow solid. Granite shown as magenta wireframe)

Figure 14-100 Sectional View of Miradani North Lithology Model

Note: (* Minzone mineralization domain shown in yellow solid. Granite shown as magenta wireframe)


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Table 14-60 lists all the geological models and codes.

Table 14-60 List of Miradani North Geological Models and Codes

Model Type

Model Name

Code

Original File Name

Effective Date

Mineralization

Minzone

100

MinZone_v3_20210515final.dxf

2021-05-15

Mineralization

OutMinzone

900

SEDS_box.dxf

2021-05-15

Lithology

Granite

1

GR1.dxf

2021-05-04

Lithology

Skinny Granite 1

2

GR2.dxf

2021-05-04

Lithology

Skinny Granite 2

2

GR3.dxf

2021-05-04

Lithology

Sediments

9

SEDS_box.dxf

2021-05-04

Oxidation

Oxide

1

Boco_110521.dxf (ox-tr contact)

2021-05-11

Oxidation

Transitional

2

Boco_110521.dxf (ox-tr contact)

2021-05-11

Oxidation

Fresh

3

ToFr_110521.dxf (Tr-Fr contact)

2021-05-11

14.6.3 Exploration Data Analysis

Drillhole samples are coded by lithology, oxidation, and mineralization models for statistical analysis. Exploratory data analysis was carried out for both individual and combined geological features. The mineralization model provides the best domain to distinguish different grade populations of the deposit. Different lithologies or oxidation within the same mineralization domain do not show significant statistical differences (Figure 14-101 and Figure 14-102).

Figure 14-101 Log Probability Plot of Miradani Exploration Drillhole Assays Au Grade by Mineralization


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Figure 14-102 Log Probability Plot of Miradani Exploration Drillhole Assays Au Grade by Oxidation and Lithology Model Inside Minzone

14.6.3.1 Gold Grade Capping/Outlier Restrictions

Anomalous high grade Au assays are present in the drillhole samples, with maximum grade of 136.57 g/t in exploration drillholes.

The threshold grades are assessed by mineralization domains with histogram and log probability (disintegration) graphs of the drillhole assays (Figure 14-103), with consideration of reasonable metal loss and the general grade behaviour at the nearby mined deposits.  Assays higher than the threshold grades are capped to the respective threshold grades for each domain. The comparison of sample statistics before and after top-cutting is presented in Table 14-61.


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Figure 14-103 Top-cut Analysis of Miradani Exploration Drillholes Au Assays

Table 14-61 Raw and Top-Cut Assays Statistics of Miradani Exploration Drillholes

 

Sample Assays Au Grade (g/t)

 

Top-cut Assays AUCUT (g/t)

Domain

Count

Mean

CV

Maximum

Top-cut
Au (g/t)

#
Samples
Cut

Mean

CV

Maximum

Metal
loss

100

3,766

1.21

3.01

136.57

25

12

1.14

2.2

25

6%

900

13,145

0.05

9.31

24.18

5

13

0.04

5.49

5

16%



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14.6.3.2 Composites

The dominant sample length is 1.0 metre for exploration drillhole samples. There is no obvious trend of grade distribution by the length of the samples.

The exploration drillhole samples are composited from collar to toe at 1.0 metre equal length intervals for uniform support. Residual of less than half of the composite length are added to the last full composite. The residuals are mostly present at the end of drillholes. Drillhole traces without sample or missing assays are ignored. The composites are coded by the mineralization domain wireframes (majority rule) and the statistics of drillhole composites are presented in Table 14-62 with comparison to the assay statistics. Assays are top cut prior to compositing and composite grade AUCUT was calculated from assays AUCUT.

Table 14-62 Composite Au Statistics of Miradani Exploration Drillholes

 

Sample Assays Au Grade (g/t)

Composite 1.0m AUCUT (g/t)

Domain

Count

Mean

CV

Max

Count

Mean

CV

Max

100

3,766

1.21

3.01

136.57

3,695

1.14

1.99

25

900

13,145

0.05

9.31

24.18

13,275

0.04

5.25

5

14.6.3.3 Boundary Analysis

The boundary condition between the mineralization, oxidation, and lithology was assessed through visual inspections and contact graph analysis. The grades show sharp contact between the mineralization domain and the non-mineralized background. Within the mineralization domain, the grades do not show distinct change across the lithology boundaries or oxidation boundaries (Figure 14-104).

Figure 14-104 Contact Graphs of Drillhole Assays by Miradani Lithology and Mineralization Models


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Effective Date: February 28, 2022

14.6.3.4 Declustering

Conditional simulation (Sequential Gaussian Simulation, or SGS) was used to model the main mineralization domain (100). Normal Score transformation of the Au grade is required for SGS process, which requires the de-clustered distribution of the composite Au grade for the domain in normal score transformation. Cell de-clustering method was used. Several de-clustering cell sizes are tested and the final cell size of 20x40x20 (m) are selected and applied, primarily based on the data spacing and review of mean vs. cell size graph (Figure 14-105). The de-clustered statistics are compared to raw composites and presented in Table 14-63.

Figure 14-105 Cell De-clustered Miradani Exploration Drillhole Composites Au Mean vs. Cell Size

Table 14-63 De-clustered and Raw Miradani Exploration Drillhole Composite Au Statistics Comparison

 

Composite 1.0m AUCUT

Composite 1.0m AUCUT (De-clustered)

 

Domain

Count

Min

Max

Mean

CV

Count

Min

Max

Mean

CV

Metal
loss

100

3,695

0.001

25

1.14

1.99

3,695

0.001

25

1.08

2

-5%

14.6.3.5 Variography

Variography was modelled for Mineralization Domain 100 only. The variogram was modelled in Gaussian space with the normal scores transformed from the de-clustered composite grades in real space. Correlograms are calculated and modelled with a two-structure exponential/spherical model using SAGE™ 2000 software. A robust variogram (correlogram) model was obtained for Domain 100 that matches well with the observed geology and trends of mineralization (Figure 14-106, Figure 14-107, and Table 14-64).


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-106 Miradani Domain 100 Composite Au Normal Score Variogram (Correlogram) Parameters

Figure 14-107 Miradani Domain 100 Drillhole Composite Au Normal Score Variogram (Correlogram)


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Effective Date: February 28, 2022

Table 14-64 Miradani Domain 100 Composite Au Normal Score Variogram (Correlogram) Parameters

Domain

 

Type

 

Sill

 

Rotation Angles (Vulcan)

Ranges (m)

Azimuth

Plunge

Dip

Major

Semi

Minor

100

Nugget

0.2

-

-

-

-

-

-

Exponential

0.724

46

19

129

16.5

9.4

3.9

Spherical

0.076

65

80

-28

43.3

34.3

97.5

14.6.4 Estimation/Interpolation Methods

14.6.4.1 Block Model Setup

A block model was constructed in Vulcan software. The model covers the full extent of geology and mineralization models and provides adequate extent to allow pit optimization process. The block size, at 5 x 5 x 6 metres, is considered the SMU, smallest mining unit for Miradani North.

A large-scale panel (40 x 40 x 18 metres) was also set up for post-processing of the Domain 100 simulation to localize the simulated grades to the SMU blocks, each panel size being a multiple of the smaller SMU block size.

The block model setup dimensions are presented in Table 14-65 and Table 14-66.

Table 14-65 Miradani North 2021 Resource Model Setup

 

Origin

Minimum

Maximum

Extent (m)

Block Size (m)

# Blocks

Easting

610400

610400

611700

1300

5

260

Northing

691250

691250

692500

1250

5

250

Elevation

-350

-350

202

552

6

92

Table 14-66 Miradani North Mineralization Domain 100 Simulation Model Setup

 

Origin

Minimum

Maximum

Extent (m)

Block Size (m)

# Blocks

Easting

610905

610905

611230

325

1

325

Northing

691720

691720

692030

310

1

310

Elevation

-248

-248

160

408

1

408

The block model was coded with the geological model wireframes by majority rule as shown in Figure 14-108.


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Effective Date: February 28, 2022

Figure 14-108 Vertical Sectional View of Miradani North Resource Block Model of Mineralization Domain

14.6.4.2 Estimation

Grade estimation for Miradani North used a combination of localized selective mining unit (LSMU) and Inverse Distance methods. The main mineralization domain (100) used LSMU, and the background domain (900) used Inverse Distance to power 3 (ID3).

LSMU Estimation

The grade estimation for Domain 100 was a localized, recoverable resource model with grades estimated at a SMU scale of 5 x 5 x 6 metres. The local metal distribution for the recoverable resource was estimated using conditional simulation. Basic workflow for LSMU model is as follows:

1. Point scale conditional simulation at 1 x1 x 1 metre scale (Sequential Gaussian Simulation)

2. Re-block each realization to SMU scale (5 x 5 x 6 metre)

3. Divide the domain into panels (40 x 40 x 18 metre)

4. Calculate the local metal distribution within each panel from SMUs for all realizations at a sequence of cut-off grades

5. Index the SMU blocks by ID3 estimates within each panel to represent a local grade distribution

6. Assign grades from the local distribution in increasing sequence to SMUs ranked by the indexed values (ID3 estimates).


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The localisation is the same approach used for Localized Uniform Conditioning (LUC) which estimates localized SMU grades conforming to the proper grade-tonnage curves as well as maintaining the relative spatial grade distribution pattern indicated by the ID3 estimates. The applied estimation differs from Localized Uniform Conditioning (LUC) by obtaining the local distribution through conditional simulation rather than through uniform conditioning. This maintains the advantages of having a probabilistic conditional simulation model (multiple realization models) while providing a deterministic summary model (one grade per block) to be used for the reporting and optimisation processes.

A total of 50 simulation realizations were produced at 1 x 1 x 1 metre point scale support for Domain 100. Simulation was conducted using Simple Kriging in Gaussian space with normal score transformed composite grades and back-transformed to "real-space" grades with maximum limited to 25 g/t Au. The sample was assigned to the nearest grid nodes (block) and a maximum of 15 composites were allowed for estimation. Search parameters are listed in Table 14-67.

Table 14-67 Miradani Domain 100 SGS Search Parameters

 

 

Search Ellipsoid

 

 

Radius (m)

Orientation (Vulcan)

Modelling Method

Domain

Major

Semi

Minor

Bearing

Plunge

Dip

SGS

100

75

50

30

40

0

76

Each SGS realization was regularized to 5 x 5 x 6 metre SMU block size and each SMU block was also estimated a grade with ID3 method. The SMU blocks are then coded with the panel ID (each 40 x 40 x 18 metre panel was assigned a unique ID code) before being exported to csv block model file for post-processing.

The indexing and localization of block grades are completed in Microsoft™ Excel, PowerQuery and processed with DAX language. The localized block model file was then re-imported to Vulcan™ as the final grade model for Domain 100.

Inverse Distance (ID3) Estimation

The ID3 was used to produce the indexing values for Domain 100 SMU grade localization, and for grade estimation of Domain 900. Domain 100 was estimated in three-passes with the 3rd Pass using dynamic anisotropic search orientation that was estimated from two trend surfaces. Domain 900 was estimated in one pass. The ID3 search parameters are shown in Table 14-68. The ID3 search orientations are shown in Figure 14-109.

Table 14-68 Miradani Inverse Distance (ID3) Estimation Parameters

 

Search Ellipsoid

 

Composite

DH

Octant

Radius (m)

Orientation (Vulcan)

Est. Pass

Min

Max

Max/h

MinDH

MaxDH

Max/Oct

Major

Semi

Minor

Bearing

Plunge

Dip

ID3 / 100 P1

10

20

6

2

4

8

50

40

15

45

20

130

ID3 / 100 P2

10

20

6

2

4

8

100

80

30

45

20

130

ID3 / 100 P3

6

18

6

1

3

6

150

150

100

da (*)

0

da (*)

ID3 / 900

6

16

6

1

3

6

50

50

20

40

0

76

Note: *da: dynamic anisotropic orientation calculated from two trend surfaces


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Figure 14-109 Illustration of Miradani ID3 Estimation Search Orientations

14.6.4.3 Bulk Density

Bulk density was assigned to the block model based on a combination of lithology and oxidation. The Fresh zone granite and sedimentary rock bulk density values are calculated from a total of 187 measurements of drill core samples representing the various lithology types. The calculated average bulk density values for different lithology types in fresh zone are in line with the that of adjacent deposits and are used to assign densities to block model. There was no sample taken for density measurement from oxide or transitional zones at Miradani North. After consultation with the Asanko Exploration team and review of the bulk densities of similar material types at adjacent deposits, it was considered appropriate to use the oxide and transitional densities at Nkran for Miradani North. Densities assigned to the block model are shown in Table 14-69.

Table 14-69 Miradani Bulk Density Values Assigned to Resource Block Model (by Material Type)

Material Type

Bulk Density (t/m3)

Oxide

1.69

Transitional

2.10

Fresh - Granite

2.64

Fresh - Sediments

2.68

14.6.5 Validation

Validation of the block model included the validation of simulation model of the main mineralization domain, statistical comparison of the model and input data, visual inspection.

14.6.5.1 Validation of Simulation

The simulation was validated at point scale. The point scale realizations reasonably reproduced the statistics of input composites (Figure 14-110 and Figure 14-111). The visual inspection of select realizations in 2D and 3D also show reasonable reproduction of the orientation and ranges of input variogram (Figure 14-112).


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Effective Date: February 28, 2022

Figure 14-110 Miradani Accuracy Plot of 50 SGS Realizations

Figure 14-111 Miradani Statistical Comparison of SGS Realizations and Input Composites


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Figure 14-112 Miradani SGS Realization ausim03 Au Grade Compared to Variogram Model

14.6.5.2 Swath Plots and Global Statistical Comparisons

Swath plots were created by comparing the model block grades and input in spatial increments in northing, easting, and elevation slices throughout the deposit (Figure 14-113). The plots show that block grades (Indicated) are smoother and follow the trend of input composite grades, which is the expected result of estimation, with block grades showing lower overall variance.


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Figure 14-113 Miradani Swath Plot by Easting, Northing, and Elevation for Block and Composite Au (g/t) for Domain 100 Indicated Class

The global statistics of the model Au grade also compared well with composite Au grade and ID3 estimates, with the difference of the mean grade within 5% (Table 14-70).

Table 14-70 Global Statistics Comparison of Miradani North Resource Model, Composites, and ID3 Estimate

Domain

Variable

Count

Mean

CV

Minimum

Maximum

100

Composite

CMP_AUCUT (decl_wt)

3,695

1.08

2.00

0.001

25.00

Resource Model

AU (Class 2)

25,103

1.06

0.76

0.091

6.21

AU (Class 2+3)

43,179

1.04

0.75

0.091

6.21

Model_ID3

AUID (Class 2)

25,103

1.12

0.81

0.002

11.61

AUID (Class 2+3)

43,179

1.06

0.78

0.002

11.61

 

900

Composite

CMP_AUCUT

13,275

0.04

5.25

0.001

5.00

Resource Model

AU (Class 2)

78,946

0.04

2.36

0.001

3.37

AU (Class 2+3)

239,735

0.04

2.92

0.001

3.37

 


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14.6.5.3 Visual Inspection

The block model was visually reviewed in 2D in sections and level plans, and in 3D to ensure the block estimates are supported by the surrounding composites. In general, the estimates compare well with the input data.

14.6.5.4 Comparison with ID3 Estimates

The LSMU estimates were compared with ID3 estimates in tonnage-grade graphs to ensure that the simulation-based LSMU estimates are supported by alternative conventional method (Figure 14-114).

Figure 14-114 Miradani Tonnage-Grade Comparison of LSMU and ID3 Estimates in Domain 100

14.6.6 Classification of Mineral Resources

Miradani North deposit shares the common geological features as other well studied deposits on the Nkran structural trend. The control of mineralization is well understood through the three campaigns of exploration drilling by Asanko.

Drill spacing is the primary factor to define resource classification and only Indicated and Inferred resources are defined at Miradani North. The spacing criteria to separate the resource classes are based on the variogram ranges, quantitative assessment of resource uncertainty, and experiences of mining at adjacent deposits in similar geological settings.

A quantitative uncertainty assessment was conducted with the simulation model of Mineralization Domain (100) and the derived criteria for classification was used for Domain 100 and 900. The results of the assessment supported the use of 45-metre drillhole spacing to define Indicated Resource Class. The Inferred class required 80-metre spacing, which was primarily based on the maximum variogram ranges.

Nominal drill spacing is determined with a widely accepted mathematic approximation based on calculated average distance of the closest three drillholes to the block (Table 14-71). The final classification of the block model and 3-hole average distance is illustrated in Figure 14-115 and Figure 14-116.

Table 14-71 Miradani North 2021 Resource Classification Criteria

Classification
Category

Drill Spacing (m)

3-Hole Average
Distance (m)

Measured (1)

No Measured classification defined

-

Indicated (2)

45 x 45 (m) drill spacing (Domain 100)

<= 31.82

Inferred (3)

80 x 80 (metre) drill spacing, or nearest DH < 60 metre distance

<= 56.58



NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-115 Illustration of Miradani North 2021 Resource Classification

Figure 14-116 Miradani Plan View of Blocks Coloured by 3-Hole Average Distance to Block Centroids


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Effective Date: February 28, 2022

14.6.7 Reasonable Prospect of Eventual Economic Extraction

The Miradani mineralization is assumed amenable to open pit mining and milling and recovery through CIL gold processing. The reasonable prospect for eventual economic extraction of the Mineral Resources was tested by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™ software at US$1,600/oz gold price with all the materials of Indicated and Inferred classes and with a reporting cut-off grade of 0.5 g/t Au. The conceptual constraining parameters are listed in Table 14-72. See "Cautionary Note about Mineral Resources".

Table 14-72 Miradani North Conceptual Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.025 - 1.647

Mining Cost Incremental (US$/Vertical 6m)

0.0087 - 0.0353

Mill Feed Transport (US$/tonne)

2.86

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55

14.6.8 Mineral Resource Statement

The Miradani Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

The Qualified Person is Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-73. The estimated grades and tonnages for multiple cut-offs are shown in Figure 14-117.

Table 14-73 Miradani North Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured na na na na
Indicated 0.5 7,116 1.28 293
Measured & Indicated 0.5 7,116 1.28 293
Inferred 0.5 2,615 1.21 102

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.025/t to $1.647/t mining costs

c. $2.86/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate


NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-117 Miradani North Tonnage - Grade Curve for Indicated Mineral Resources

14.6.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.

The current Mineral Resource estimation carries small to moderate uncertainty and risk. The shallow dipping higher grade structures developed within the general mineralized envelope based on the current geological/structural interpretations were confirmed by the spatial continuity analysis of the drillhole sample grades. But some drill holes have been drilled in azimuth and dip angles not optimal to fully define those smaller structures. There is uncertainty in the actual number and extent of those structures which require some additional drilling to confirm before mining takes place.

The depth of the previous mining was based on the best estimate as it is now covered in water, which may result in small uncertainty of the amount of in-situ mineralized material still remaining near the surface.


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14.7 Asuadai Mineral Resource Estimate

The Asuadai Mineral Resource was last updated by Mr. Shaun Hackett of Gold Fields and reported in 2020 NI 43-101 Technical Report. The QP has reviewed this estimate and is satisfied that the work was conducted at an acceptable level for the reporting of Mineral Resources according to CIM (2014) and the NI 43-101. No mining or additional drilling has been carried out at Asuadai since 2014.

14.7.1 Database

There are 59 diamond drill holes used for the modelling project. Four drillholes are excluded as they did not contain sufficient information in the primary tables. There are 77 reverse circulation drillholes used for the modelling project. The supplied files also included information on diamond drillholes and rotary air blast percussion holes that are excluded as it was supplied in other files and the RAB drillhole data was excluded as it is a poor-quality drilling method. Additionally, RC holes outside of the modelling area also in the supplied data are excluded.

14.7.1.1 Validation of Exploration Data

Leapfrog data validation tools were used to identify errors and warnings in the drill hole database. All errors and warnings were addresses in the primary files. For the secondary files all errors were eliminated but some warnings remain. Warnings do not affect Leapfrogs use of these drill holes.

Collar elevations were compared to the topographic surface. The majority of the drillholes are within 1 metre of the topo. All drillhole collars were subsequently pressed to the current topographic surface for modelling.

The drillhole database was compared to the Datamine Studio drillhole filed used for the 2014 estimate. Holes were checked for availability. Three RC holes were found in the 2014 Datamine file that were not available in the current drillhole database. These holes were extracted and added to the current project drillhole file in Datamine for grade modelling. These holes could not be added for the geological modelling in Leapfrog as they were only available in a desurveyed format and did not have the component collar, survey and interval data required for loading into Leapfrog.

14.7.2 Geological Models

Mineralization is hosted within an east-northeast trending shear zone which cuts through sediment packages and is also found parallel to bedding within wacke/sandstones on the southeast footwall side and wacke/siltstones on the northeast hanging wall side. Diorite dykes have intruded along the central lithological contact of the shear. Sub-parallel to this central contact are hanging wall and footwall extents of the shear zone.

A series of repeating north-south trending structures cross the shear zone, offsetting the main lithological contact and the hanging wall shear contact. Each of the diorite bodies appears to be bracketed by a pair of these north-south structures. These structures are not evident on the magnetic images due to their orientation and the low magnetic contrast in the host lithologies (Figure 14-118).

The geological model builds on the observations and concepts modelled by HMM Consultancy in 2014. The geological model was constructed using Leapfrog Geo and was built in four parts:

1. Lithology model (GROCK)

2. Structural model (Interpreted structural planes)

3. Mineralization model (MDOM)

4. Material Type model (MROCK)


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14.7.2.1 Lithology, Structure, and Material Type Models

The lithology, structure, and material type models were initially interpreted from the diamond drill holes. These models, along with the mineralization model, were updated to account for the mineralization intersected in the RC drill holes. The lithology and structural models are shown fin Figure 14-118.

Figure 14-118 Asuadai Lithological and Structural Models

The material type represents different levels of weathering for material movement purposes. A simple weathering model was constructed from the diamond drill hole logged for the base of complete oxidation (BOCO) and the top of fresh rock (TOFR). The model divided weathering into Oxide (strongly to moderately oxidized), Transitional (weakly oxidized) and Fresh (fresh rock) material types. Away from the drilling the thickness of weathering was maintained parallel to topography. The weathering model was deemed to be suitable for assessing simple mineral process flow sheets but may not be sufficiently detailed for complicated processing assessments.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
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Figure 14-119 Asuadai Material Type Models

14.7.2.2 Mineralization Model

HMM Consultancy observed two generations of mineralization in 2014 (Dusci & Davies, 2014), an earlier, steep, ductile-type mineralization, parallel to bedding and foliation and a later set of shallow dipping quartz veins. They considered that the shallow set of veins represented the dominant mineralization and were best developed within the diorite bodies. They also noted an increase in sheer intensity and mineralization in the sediments adjacent to the diorite contact. This observation is consistent with Asanko Gold's Dynamite Hill deposit where increased intensity of shearing adjacent to the granite contacts is observed in the pit. They interpreted a moderate plunge to the mineralization towards the southwest at the intersection between the northeast-southwest main shear and the north-south crosscutting structures. This is different to other deposits in the area which dominantly show a northerly plunge to mineralization.

To guide the mineralization modelling a preliminary analysis was undertaken on the raw grades within the modelled lithologies and material types. This confirmed that the diorite (DI) hosts the higher-grade material and that there is only a small difference between the sediment units (FW_SED, HW_SED) within the main shear. The oxide appeared to be slightly higher-grade than the transitional and fresh material (Figure 14-120).


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Grade Analysis by Lithology

Grade Analysis by Weathering

Figure 14-120 Asuadai Preliminary Grade Analysis

For the mineralization model, the main shear was split into fault blocks along strike between the north-south structures (FB1 to FB6) and a wireframe was constructed adjacent to the diorite contact capturing the higher shear intensity mineralization in the sediments close to the diorite contact (DI shear) (Figure 14-121).

Figure 14-121 Asuadai Mineralization Model


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A secondary grade analysis was undertaken to assess the impact of the mineralization domains. This showed a clear variation in grade between the different fault blocks within the main shear and confirmed the higher-grade mineralization in the sediments adjacent to the diorite contact (Figure 14-122).

Figure 14-122 Asuadai Secondary Grade Analysis

Many of the geological concepts observed and modelled by HMM Consultancy in 2014 were supported by the relogging exercise and were incorporated into the updated model. The geological models are therefore similar. In the current model the diorites were modelled as two discreet bodies as opposed to a continuous dyke as was modelled in 2014. The relogging programme did not support the 2014 modelled phyllite/shale units and these were updated as structural contacts rather than lithological units. The footwall contact to the main shear has been introduced. The new material type model is smoother and slightly deeper for the oxides compared to 2014.

All domains are summarized in Table 14-74.


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Table 14-74 Asuadai Mineralized Domains

Leapfrog Output file

Datamine Wireframe File

Datamine Mode

Topographic model

 

 

TOPO

TOPO

1

Lithological model

 

 

GROCK - DI

LITH

10

GROCK - HW_SED

LITH

22

GROCK - FW_SED

LITH

21

GROCK - HW_WASTE

LITH

32

GROCK - FW_WASTE

LITH

31

Structural model

 

 

NS12

STRUC

1

NS23

STRUC

2

NS34

STRUC

3

NS45

STRUC

4

NS56

STRUC

5

STRUCTURE_FW

STRUC

6

STRUCTURE_HW

STRUC

7

MAIN_SED_CONTACT

STRUC

8

Material type model

 

 

MROCK - OXIDE

MROCK

2

MROCK - TRANS

MROCK

3

MROCK - FRESH

MROCK

4

Mineralization model

 

 

MDOM - MDOM_DI

DOMAIN

100

MDOM - MDOM_DI_SHEAR

DOMAIN

200

MDOM - MAIN_SHEAR_FB1

DOMAIN

301

MDOM - MAIN_SHEAR_FB2

DOMAIN

302

MDOM - MAIN_SHEAR_FB3

DOMAIN

303

MDOM - MAIN_SHEAR_FB4

DOMAIN

304

MDOM - MAIN_SHEAR_FB5

DOMAIN

305

MDOM - MAIN_SHEAR_FB6

DOMAIN

306

MDOM - MDOM_FW_WASTE

DOMAIN

901

MDOM - MDOM_HW_WASTE

DOMAIN

902

Ancillary wireframes

 

 

Main_Shear_0.3g_Ind - Min

SUBDOM

10

DH_ALL - DH_10m

DHSPACE

10

DH_ALL - DH_20m

DHSPACE

20

DH_ALL - DH_40m

DHSPACE

40

14.7.3 Exploration Data Analysis

Statistical analysis was carried out using Snowden Supervisor version 8.8. The domains are a combination of lithology, material type and fault blocks.


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In the main shear sediments, transitional and fresh material was found to have a similar grade distribution while there is a bias towards the oxide material (Figure 14-123). Oxide material is therefore being domained separately in the main shear sediments except for fault block 1 which only contains a small number of drill holes. The diorite and the contact shear sediments do not show a bias to the oxide material and therefore all material types are grouped together for estimation. Summaries of the domain codes used to distinguish the data during geostatistical analysis and estimation are shown in Table 14-75.

Figure 14-123 Asuadai Material Type Analysis

Table 14-75 Asuadai Estimation Domains

ESTIMATION
DOMAIN
GROCK MROCK MDOM
DOMAIN
FAULT
BLOCK
DESCRIPTION
D1000 10 2-4 100 - Diorite intrusive
Oxide, transition and fresh
D2000 21-22 2-4 200 - Contact Shear sediments
Oxide, transition and fresh
D3220 21-22 2 302 2 Fault block 2
Main Shear sediments
Oxide
D3240 21-22 3-4 302 2 Fault block 2
Main Shear sediments
Transition and fresh
D3320 21-22 2 303 3 Fault block 3
Main Shear sediments
Oxide
D3340 21-22 3-4 303 3 Fault block 3
Main Shear sediments
Transition and fresh
D3420 21-22 2 304 4 Fault block 4
Main Shear sediments
Oxide


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


ESTIMATION
DOMAIN
GROCK MROCK MDOM
DOMAIN
FAULT
BLOCK
DESCRIPTION
D3440 21-22 3-4 304 4 FAULT BLOCK 4
MAIN SHEAR SEDIMENTS
TRANSITION AND FRESH
D3520 21-22 2 305 5 Fault block 5
Main Shear sediments
Oxide
D3540 21-22 3-4 305 5 Fault block 5
Main Shear sediments
Transition and fresh
D3100 21-22 2-4 301 1 Fault block 1
Main Shear sediments
Oxide, transition and fresh

14.7.3.1 Gold Grade Capping/Outlier Restrictions

The data was assessed for high-grade outlier samples. A top cap or truncation approach has been used where grade values above the selected top cap threshold are reduced in value to the threshold. The threshold is selected by reviewing the anamorphosis model and selecting an upper limit that results in a good fit of the anamorphosis model through the whole grade range (Figure 14-124).

Raw Anamorphosis Fit

Top-capped Anamorphosis Fit - Domain 3420

Figure 14-124 Top Cap Selection Example

The selected top cap thresholds and influence of the top cap on the calculation of the global mean for each domain can be seen in Table 14-76.

14.7.3.2 Composites

Most of the samples were originally collected at sample length of 1 metre or smaller. There are a small number of RC holes that were originally collected at 1.5 metre samples lengths. Coded drill hole sample intervals were composited to 1 metre composite lengths for each domain. Where the total drill hole intersection in a domain is not a multiple of the 1 metre.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-76 Asuadai Domain Statistics and Top Caps

ESTIMATION DOMAIN

RAW DATA

TOPCAP DATA

DE-CLUSTER

 

Count

Minimum

Maximum

Mean

Variance

Topcap

Number

Mean

Variance

Mean

Variance

D1000

658

0

53.82

1.05

10.83

20.00

3

0.95

4.52

0.93

3.85

D2000

763

0

28.15

1.00

4.94

20.00

3

0.98

4.3

1.00

5.17

D3220

275

0

4.13

0.18

0.17

2.00

3

0.17

0.12

0.14

0.11

D3240

1306

0

9.12

0.17

0.29

2.00

17

0.15

0.1

0.16

0.13

D3320

405

0

12.2

0.32

0.89

N/A

0

0.32

0.89

0.28

0.69

D3340

1200

0

15.33

0.35

1.42

N/A

0

0.35

1.42

0.32

1.3

D3420

792

0

95.00

0.87

17.19

20.00

3

0.73

3.37

0.55

3.22

D3440

2716

0

34.00

0.35

1.54

20.00

1

0.35

1.27

0.32

1.31

D3520

126

0

13.10

0.48

2.32

2.00

4

0.31

0.24

0.36

0.28

D3540

516

0

24.59

0.45

2.79

8.00

4

0.41

1.55

0.45

2.06

D3100

109

0

5.00

0.10

0.23

2.00

1

0.07

0.04

0.07

0.06

14.7.3.3 Declustering

The drilling shows a typical spatial bias, with additional drilling being carried out in higher grade areas and a higher density of drilling close to surface than at depth. To account for this in the global data analysis a moving window declustering algorithm was applied. The moving window size was selected at 70 x 70 x 20 metre which roughly equates to the broader, regular drill spacing in the project. The influence of the declustering algorithm on the calculation of the global mean for each domain can be seen in Table 14-76.

14.7.3.4 Variography

The domains were grouped for variography based on the geometry of the mineralization. The diorite and the contact shear mineralization have a steep southerly plunge and the variogram (V101) was orientated to reflect this. The mineralization in the main shear sediment domains is parallel to the shear and V301 is orientated to reflect this. The variograms are modelled on experimental gaussian variograms which are moderately to poorly structured. To reflect the uncertainty in the variogram structure, a second set of alternate variogram models were developed (V102 and V302) and in each of these models a short-range structure was introduced with a local rotation to align the variogram structure to the flat lying vein geometry reported from the drill core. Variogram parameters are summarized in Table 14-77 and modelled variograms are shown in Figure 14-125 Asuadai Relative Variogram Models

Table 14-77 Asuadai Variogram Parameters

Variogram

Structure

Sill

Range U

Range V

Range W

Rotation

V101

S1 Nugget

0.20

 

 

 

 

S2

0.35

14

6

2

-150,65,51

S3

0.45

80

10

10

-150,65,51

V102

S1 Nugget

0.20

 

 

 

 

S2

0.45

10

10

2

180,5,0

S3

0.1

14

12

8

-150,65,51

V301

S4

0.25

80

20

10

-150,65,51

S1 Nugget

0.20

 

 

 

 

S2

0.35

30

20

10

-115,0,70

V302

S3

0.45

150

40

30

-115,0,70

S1 Nugget

0.2

 

 

 

 

S2

0.35

10

10

20

180,5,0



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-125 Asuadai Relative Variogram Models

14.7.4 Estimation/Interpolation Methods

14.7.4.1 Block Model Setup

The Asuadai block model was developed within Datamine StudioRM. Three block sizes were considered in the block model development, the SMU which is the smallest unit that a mining decision is based on (5 x 5 x 3 metre), a less selective waste block (10 x 10 x 6 metre) and a large-scale panel (50 x 50 x 24 metre), each block size being a multiple of the smaller block size. The primary block model setup dimensions are presented in Table 14-78.

Table 14-78 Asuadai Block Model Dimensions

Dimension

Origin

Extent

SMU Size

Number of SMUs

X

617800 mE

600 m

5

120

Y

708950 mN

850 m

5

170

Z

-50 mRL

405 m

3

135

The block model was coded according to the geological model wireframes. For volume resolution, blocks were sub-celled to a sub-cell resolution of 1 x 1 x 1 metre (Figure 14-126).


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-126 Asuadai Block Model Coded Domains

14.7.4.2 Density Assignment

The results of 109 density determination from drill core were supplied with the drilling data. Dry bulk density was assigned to the block model based on a combination of lithology and material type. Density values have changed slightly from those used in 2014 and were rounded to reflect an appropriate level of precision (Table 14-79).

Table 14-79 Asuadai Dry Bulk Density Values Assigned to the Block Model

Material

Rock Type

Density

Oxide

All

1.9

Transitional

All

2.3

Fresh

Sediments

2.7

 

Diorite

2.6

14.7.4.3 Estimation

The grade model estimated for Asuadai is a localized, recoverable resource model with grades estimated at a SMU scale of 5 x 5 x 3 metre and is referred to as a localized SMU model (LSMU). The local metal distribution for the recoverable resource was estimated using conditional simulation.

Basic workflow for the LSMU model:

1. Point scale conditional simulation (sequential Gaussian simulation)

2. Re-block each realization to SMU scale (5 x 5 x 3 metre)

3. Divide the domain into panels (50 x 50 x 24 metre)

4. Calculate the local metal distribution within each panel from SMUs for all realizations at a sequence of cut-off grades

5. Index the SMU blocks within each panel to represent a local grade distribution

6. Assign grades from the local distribution in increasing sequence to SMUs ranked by the indexed values.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The localisation is the same approach used for Localized Uniform Conditioning (LUC) which estimates localized SMU grades conforming to the proper grade-tonnage curves as well as maintaining the relative spatial grade distribution pattern indicated by the directly estimated small block grades. The applied estimation differs from LUC by obtaining the local distribution through conditional simulation rather than uniform conditioning. This maintains the advantages of having a probabilistic conditional simulation model (multiple realization models) while providing a deterministic summary model (one grade per block) to be used for the reporting and optimisation processes.

14.7.5 Validation

Validation of the block model included the validation of simulation model of the main mineralization domain, statistical comparison of the model and input data, visual inspection

14.7.5.1 Validation of Simulation

The point scale gaussian values are validated for reproduction of the global mean and variance (0 and 1). The validation of the Gaussian values for Doman 1000 is shown Figure 14-127. Reproduction of the mean is good across all realizations however the variance is systematically low. The QP has commonly found this with sequential gaussian simulation within Isatis, particularly when declustering has been applied to the data. The decluster weights are considered in the anamorphosis function but are not considered during simulation. Validation of the variogram reproduction also shows the reduced variance (Figure 14-128). The influence of the two variograms applied can also be seen in the variogram validation particularly in the short range.

Figure 14-127 Asuadai Validation of Gaussian Values


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-128 Asuadai Variogram Reproduction

Simulated gaussian values are then back transformed to real values and the reproduction of the data distribution is reviewed using grade tonnage curves to show the cumulative distribution. Figure 14-129 shows the cumulative grade tonnage curves for Domain 1000, again the influence of the reduced variance can be seen particularly on the grade curve at higher cut offs versus the input anamorphosis function.

Figure 14-129 Asuadai Data Distribution Reproduction

One additional validation is applied is to ensure the LSMU model lies close to the centre of the simulation cloud of grade tonnage curves, Figure 14-130 shows the grade tonnage curves for Domain 1000.

Figure 14-130 Asuadai Grade Tonnage Validation

Figure 14-131 shows the LSMU model in cross section compared to three simulation realizations. All models show a similar level of grade variability.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


LSMU - Localized Model

Mid-case Simulation Realization

Low-case Simulation Realization

High-case Simulation Realization - Section 709200mN

Figure 14-131 Asuadai LSMU Model and Simulation Realizations

14.7.5.2 Information Effect

It is common in most recoverable resource techniques to apply an information effect. The purpose of the information effect is to make an allowance that "perfect" selectivity of SMUs will never be achieved as mining selection will be based on a short-term model from grade control spaced drilling and a degree of smoothing will be present due to this. Information effect is generally applied as a variance reduction when modelling the SMU distribution. In this case no information effect has been applied as there is already a reduced variance in the simulations.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.7.5.3 Reconciliation

No grade control or production has been undertaken at this project, so no reconciliations can be made.

14.7.6 Classification of Mineral Resources

Drill spacing is the primary factor to define resource classification and only Indicated and Inferred resources are defined at Asuadai. The 2014 Indicated classification used a nominal drill spacing of 20 x 20 metres, with the remainder being classified as Inferred. This spacing is inconsistent with other Asanko Gold deposits where a 40 x 40 metre drill spacing had been used to classify material as Indicated. A new classification scheme was proposed and applied as shown in Table 14-80 and a comparison of the 2014 and current block classification is shown in Figure 14-132.

Table 14-80 Asuadai Classification Criteria

Classification Category

Drill Spacing (m)

Use

Measured

Measured classification not applied

 

Indicated

40 x 40 drilling

Suitable for long-term mine planning

Inferred

80 x 80 drilling

Suitable for conceptual studies

Based on the amount of unknown artisanal mining, consideration should be given to downgrading all material within 15 metres of surface to Inferred in future Mineral Resource updates.

Figure 14-132: Classification Comparison on Section 709200mN

14.7.7 Reasonable Prospect of Eventual Economic Extraction

The Asuadai mineralization is assumed amenable to open pit mining, and milling and recovery through CIL gold processing, and was evaluated for reasonable prospects for eventual economic extraction by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™. The assumptions used in preparing the conceptual pit, include mining and processing costs, metallurgical recovery, metal price and general and administrative costs, and are shown in Table 14-81  and approximately correspond to the 0.50 g/t Au Mineral Resource cut-off. See "Cautionary Note about Mineral Resources".


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Table 14-81 Asuadai Conceptual Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.025 - 1.647

Mining Cost Incremental (US$/Vertical 6m)

0.0087 - 0.0353

Mill Feed Transport (US$/tonne)

3.70

Process Cost (US$/tonne)

8.79 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55

14.7.8 Mineral Resource Statement

The Asuadai Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

The Qualified Person is Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-82. The estimated grades and tonnages for multiple cut offs are shown in Figure 14-133.

Table 14-82 Asuadai Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured na na na na
Indicated 0.5 1,620 1.29 67
Measured & Indicated 0.5 1,620 1.29 67
Inferred 0.5 18 1.17 1

Note:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.025/t to $1.647/t mining costs

c. $3.70/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-133 Asuadai Tonnage - Grade Curve for Indicated Mineral Resources

14.7.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8 Adubiaso Mineral Resource Estimate

The estimate relating to this Mineral Resource was conducted by Mr. Shaun Hackett of Gold Fields. The QP has reviewed this estimate and is satisfied that the work was conducted at an acceptable level for the reporting of Mineral Resources according to CIM (2014) and the NI 43-101.

14.8.1 Database

Fifty-four diamond drill holes, including holes with RC pre-collars, 281 reverse circulation drillholes, and 4,985 grade control drillholes are used for the modelling project. Thirty-five RC holes drilled in 2016 are used in this Mineral Resource estimate. Five RCD holes drilled in 2020 totalling 1,312 metres are not used in this Mineral Resource estimate.

Figure 14-134 Plan View of Adubiaso Exploration Drillholes

14.8.1.1 Verification of Exploration Data

In addition to data verification discussed in Section 11 and 12 of this report, all drilling data was validated on import into Datamine. No major errors reported.

Assay intervals with no recorded gold grades were assumed to be low grade values.

14.8.2 Geological Models

This geological model was completely reinterpreted by M. Crawford (Crawford, 2019). The following descriptions are based on file notes collected during the modelling process.

The geology model has been built in four parts:

1. Lithology model (GROCK)

2. Structural model (Interpreted structural planes)

3. Mineralization model (MDOM)

4. Material type model (MROCK)


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.2.1 Lithology, Structure, and Material Type Models

The Lithology model was developed from the diamond and RC drillholes only, as these have the most reliable logging information. The mineralization model uses the grade control drilling within the mined-out portion of the pit and then the same trends are imposed on the diamond and RC drilling at depth. Reference was made to available processed images from the airborne geophysics. The modelling in Leapfrog uses manually selected intervals and geological model algorithms to generate the resulting wireframe models. Lithology wireframe models are shown in Figure 14-135 and Figure 14-136.

The material type represents different levels of weathering and is suitable for assessing material movement and simple mineral processing flow sheets but may not be detailed enough for more complicated processing assessments.

Figure 14-135 Adubiaso Lithological and Structural Models (Section View)


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-136 Adubiaso Lithological and Structural Models (Plan View)

14.8.2.2 Mineralization Model

The principal control on the mineralization is the Adubiaso shear. Within the shear the mineralization is then best developed along the hanging wall side of the felsic porphyry units. The mineralization appears to be a composite of moderately dipping structures hosting the higher gold grades (Figure 14-137 and Figure 14-138) within an overall steeper dipping envelope subparallel to the trend of the porphyries. Local thickening of the mineralization envelope also corresponds to higher intensity in the gold mineralization this appears to be controlled in part by the interpreted northwest/southeast crosscutting structure, resulting in a moderate northeast plunge to the mineralization.

Figure 14-137 Adubiaso Mineralization Model (Cross-section View)

Note: Blue stripes are conceptual illustrations of extension veins/structures and green stripes are modelled from drilling.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-138 Adubiaso Mineralization Model (Long-section View)

14.8.3 Exploration Data Analysis

Data analysis was undertaken to determine estimation domains and to derive parameters for estimation. Figure 14-139 shows the domain numbering convention based on progressive mineralization controls for the main domains. First order is the along strike variation within the shear numbered by fault block from SW to NE with values in the 1000 to 5000 range. Second order is variation across the shear with values in the 100-300. Third order is a sub domain based on the interpreted low angle structures or outside of the low angle structures using 10 for within the structures. Some minor domains were re-coded to incorporate them into larger adjacent domains where a domain numbering combination resulted in a small number of samples. The northern splay structure is assigned domain numbers in the 6000 series. Sub domain wireframes within the northern splay are individually number to subdomains (111-121). The felsic porphyries postdate mineralization and are coded to a domain series of their own (9000) except for the grade control samples. No lithological information is available for the grade control and the interpreted positions of the felsic porphyries are not sufficiently detailed enough at the grade control spacing.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 14-139 Adubiaso Domain Numbering Convention

Domain coding is summarized in Table 14-83.

Table 14-83 Adubiaso Wireframe files

Leapfrog Output File

Datamine Wireframe File

Datamine Code

Topographic model

TOPO_CURRENT

TOPO

1

PREMINE_TOPO

TOPO_PM

1

Lithological model

L - FP3

LITH

13

L - FP4

LITH

14

L - FP6

LITH

16

L - FP_2

LITH

12

L - FP_8

LITH

18

L - FP_Main_West

LITH

11

L - GWK_FW

LITH

31

L - GWK_HW

LITH

33

L - PHYLLITE

LITH

32



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Leapfrog Output File

Datamine Wireframe File

Datamine Code

Structural model

B_INT_LG_STH_BLOCK

STRUC

1

B_INT_NTH_BLOCK_BOUNDARY

STRUC

3

B_INT_NTH_BLOCK

STRUC

4

B_INT_STH_INFLECTION_BLOCK

STRUC

2

Material type model

MROCK - OXIDE

MROCK

2

MROCK - TRANS

MROCK

3

MROCK - FRESH

MROCK

4

Mineralization model

MIN - MIN FAULT BLOCK (1-4) - HG

MDOM_ENV

1100-4100

MIN - MIN FAULT BLOCK 5 - HG

MDOM_ENV

5300

MIN - MIN FB 1 - CENTRAL

MDOM_ENV

1300

MIN - MIN FB (2-4) - CENTRAL

MDOM_ENV

2200-2400

MIN - MIN FB 5 - CENTRAL

MDOM_ENV

5300

MIN - MIN FB 5 - CENTRAL_NTH

MDOM_ENV

6200

MIN - MIN FAULT BLOCK (1-5) - LG

MDOM_ENV

1300-5300

V_NTH_BLOCK_WEST

MDOM_ENV

6300

Mineralized structures interpretations

GM_EXTENSIONVEINS - EV*

MDOM_EV

Nov-43

GM_EXTENSIONVEINS - AA*

MDOM_EV

51-62

F*

MDOM_EV

71-92

D_NTH_ZONE

MDOM_EV

111

D_ZONE_NTH_WEST*

MDOM_EV

112-121

Ancillary wireframes

ADUBIASO_PIT

PIT

20

DH_SPACE - 10

DHSPACE

10

DH_SPACE - 20

DHSPACE

20

DH_SPACE - 30

DHSPACE

30

DH_SPACE - 40

DHSPACE

40

A check for influence of weathering on the grade distribution indicates weathering does not appear to alter the grade distribution to any significant degree (Figure 14-140).


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-140 Adubiaso Material Type Analysis

A comparison of GC, RC and DDH assays indicates there is an apparent low bias in the GC and RC sampling compared to the diamond drilling for samples collected in the upper portion of the main domain (Figure 14-141). This bias is considered a function of the drill density, related to the short scale mineralization structures. As the project advances this bias should be further investigated to confirm the underlying cause. For this model no action has been take on the bias.

The drillhole data used for resource estimation were predominately RC, hence the estimates would more heavily weighted towards RC samples. The low bias in RC samples would likely produce a more conservative grade estimation on the global sense.

Figure 14-141 Adubiaso Cumulative Grade Frequency by Drill Hole Type


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.3.1 Gold Grade Capping/Outlier Restrictions

The data has been assessed for high-grade outlier samples. A top-capping or truncation approach has been used where grade values above the selected top-cap threshold are reduced in value to the threshold. The threshold is selected by reviewing the anamorphosis model and selecting an upper limit that results in a good fit of the anamorphosis model through the whole grade range (Figure 14-142). Generally, top-cap thresholds in this methodology only affect a small number of samples and are typically higher than those that would be selected for kriging. The selected top-cap thresholds and influence of the top-cap on the calculation of the global mean for each domain can be seen Table 14-84.

Figure 14-142 Adubiaso Topcap Selection Example

14.8.3.2 Composites

Coded drillhole sample intervals were composited to 1 metre composite lengths for each domain. Where the total drillhole intersection in a domain is not a regular multiple of 1metre the composite length is adjusted slightly to reflect an even composite length close to 1 metre. Most of the samples were originally collected at sample length of 1 metre or smaller. Pre and post capping composite statistics are shown in Table 14-84.

Table 14-84 Adubiaso Domain Pre and Post Top Cut Statistics

DOMAIN

Count

Min (Au
g/t)

Max (Au
g/t)

Mean
(Au g/t)

Var

Cap (Au
g/t)

# of
Comp.
Capped

Mean
(Au g/t)

Var

D2110

397

0.01

104.5

2.27

61.68

 

 

2.27

61.68

D3110

3748

0.01

108.55

1.94

24.15

100

1

1.94

23.68

D4110

316

0.01

35.2

1.23

9.51

10

4

1.07

3.6

D2210

299

0.01

25.33

0.87

7.88

20

2

0.84

6.83

D3210

2564

0.01

58.93

1.2

14.8

 

 

1.2

14.8

D4210

650

0.01

133.33

1.9

43.77

 

 

1.9

43.77

D2310

1110

0.01

105.27

0.76

24.92

 

 

0.76

24.92

D3310

3197

0.01

105

0.93

14.38

 

 

0.93

14.38

D4310

304

0.01

132.8

1.09

61.93

20

2

0.7

 

D5310

18

0.03

15.93

1.28

12.84

5

1

0.67

1.32



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


DOMAIN

Count

Min (Au
g/t)

Max (Au
g/t)

Mean
(Au g/t)

Var

Cap (Au
g/t)

# of
Comp.
Capped

Mean
(Au g/t)

Var

D6111

58

0.01

6.02

0.67

1.13

 

 

0.67

1.13

D6112

259

0.01

3.2

0.53

0.34

 

 

0.53

0.34

D6113

81

0.01

18.5

1.28

9.82

10

3

1.07

4.22

D6114

37

0.01

7.66

0.77

2.13

 

 

0.77

2.13

D6115

119

0.01

22.3

0.68

4.88

 

 

0.68

4.88

D6116

389

0.01

9.16

0.14

0.32

 

 

0.14

0.32

D6117

182

0.01

7.26

0.31

0.83

 

 

0.31

0.83

D6118

45

0.01

3.28

0.54

0.52

 

 

0.54

0.52

D6119

771

0.01

122

1.69

58.38

 

 

1.69

58.38

D6120

93

0.01

7.25

0.37

0.71

 

 

0.37

0.71

D6121

187

0.01

12.9

1.03

3.35

 

 

1.03

3.35

D2100

1081

0.01

305.67

1.14

101

20

5

0.76

4.43

D3100

14949

0.01

430.75

1.84

54.91

200

3

1.81

39.12

D4100

662

0.01

29.9

0.52

3.08

 

 

0.52

3.08

D2200

1151

0.01

30.2

0.22

1.27

 

 

0.22

1.27

D3200

11950

0.01

76.25

0.27

3.02

 

 

0.27

3.02

D4200

1755

0.01

56.47

0.51

5.84

 

 

0.51

5.84

D2300

4006

0.01

117.24

0.23

5.97

 

 

0.23

5.97

D3300

16842

0.01

114.53

0.2

2.86

 

 

0.2

2.86

D4300

2132

0.01

13.9

0.14

0.41

 

 

0.14

0.41

D5300

2002

0.01

74.21

0.13

3.62

5

6

0.07

0.11

D1100

50

0.01

0.06

0.02

0.01

 

 

0.02

0.01

D1300

172

0.01

1.51

0.07

0.03

 

 

0.07

0.03

D6200

1857

0.01

327.47

0.94

125.5

20

12

0.49

3.96

D6300

11816

0.01

358

0.15

14.45

20

5

0.1

0.41

D9000

2760

0.01

48.9

0.18

2.78

3

15

0.11

0.09

14.8.3.3 Variography

Two variogram orientations were applied to this model; the first aligned parallel to the low angle structures and the second aligned parallel to the shear (Table 14-85). Half of the simulation realizations were run with the first variogram and then the remaining simulation realizations were run with the second variogram.

Table 14-85 Adubiaso Applied Variogram Parameters

Variogram

Structure

Sill

Range U

Range V

Range W

Rotation

V3100

S1 Nugget

0.2

 

 

 

 

S2

0.5

5

5

2

210,130, -160

S3

0.2

20

15

5

210,130, -160

S4

0.1

110

75

15

210,130, -160

V3300

S1 Nugget

0.2

 

 

 

 

S2

0.3

8

3

3

210,75,180

S3

0.2

19

7

7

210,75,180

S4

0.4

100

30

30

210,75,180

Note: All rotations use Isatis geologist plane convention


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.4 Estimation/Interpolation Methods

14.8.4.1 Block Model Setup

The Adubiaso block model was developed within Datamine Studio. Three block sizes were considered in the block model development, the selective mining unit (SMU) which is the smallest unit that a mining decision is based on (5 x 5 x 3 metre), a less selective waste block (10 x 10 x 6 metre) and a large-scale panel (50 x 50 x 24 metre) each block size being a multiple of the smaller block size. The primary block model setup dimensions are presented in Table 14-86.

Table 14-86 Adubiaso Block Model Dimensions

Dimension

Origin

Extent (m)

SMU Size (m)

Number of SMUs

X

610500 mE

1,500

5

310

Y

703600 mN

2,050

5

410

Z

-50 mRL

336

3

112

The block model was coded according to the geological model wireframes. For volume resolution, blocks were sub-celled to a sub-cell resolution of 1 x 1 x 1 metre.

Figure 14-143 Adubiaso Plan View Showing Coded Block Model by Lithology Wireframes


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.4.2 Density Assignment

Dry bulk density has been assigned to the block model based on a combination of lithology and material type. The same density values as used at Asuadai have been applied as similar rock types are present at both deposits. Density values have changed slightly from those used in 2014 and have been rounded to reflect an appropriate level of precision (Table 14-87).

Table 14-87 Adubiaso Bulk Density Block Assignment

Description

GROCK

MROCK

Dry Bulk Density (t/m3)

2014 Density

Waste Dump

N/A

5

1.3

 

All Oxide Material

ALL

2

1.9

1.78

All Transitional Material

ALL

3

2.3

2.23

Fresh Sediments

31-33

4

2.7

2.73

Fresh Porphyry

11-18

4

2.6

2.64

14.8.4.3 Estimation

The grade model estimated for Adubiaso is a localized, recoverable resource model with grades estimated at a SMU scale of 5 x 5 x 3 metre and is referred to as a localized SMU model (LSMU). The local metal distribution for the recoverable resource was estimated using conditional simulation.

Basic workflow for the LSMU model:

1. Point scale conditional simulation (sequential Gaussian simulation)

2. Re-block each realization to SMU scale (5 x 5 x 3 metre)

3. Divide the domain into panels (50 x 50 x 24 metre)

4. Calculate the local metal distribution within each panel from SMUs for all realizations at a sequence of cut-off grades

5. Index the SMU blocks within each panel to represent a local grade distribution

6. Assign grades from the local distribution in increasing sequence to SMUs ranked by the indexed values.

The localisation is the same approach used for Localized Uniform Conditioning (LUC) which estimates localized SMU grades conforming to the proper grade-tonnage curves as well as maintaining the relative spatial grade distribution pattern indicated by the directly estimated small block grades. The applied estimation differs from LUC by obtaining the local distribution through conditional simulation rather than uniform conditioning. This maintains the advantages of having a probabilistic conditional simulation model (multiple realization models) while providing a deterministic summary model (one grade per block) to be used for the reporting and optimisation processes.

14.8.5 Validation

Validation of the block model included the validation of simulation model of the main mineralization domain, statistical comparison of the model and input data, visual inspection

14.8.5.1 Validation of Simulation

The point scale gaussian values are validated for reproduction of the global mean and variance (0 and 1). The validation of the Gaussian values for Doman 3110 is shown in Figure 14-144. Reproduction of the mean is slightly low across all realizations and the variance is slightly low. The influence of the two variograms applied can also be seen in the validation with the change at realization 30.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-144 Adubiaso Validation of Gaussian Values

Simulated gaussian values are then back-transformed to real values and the reproduction of the data distribution is reviewed using grade tonnage curves to show the cumulative distribution. Figure 14-145 shows the cumulative grade tonnage curves for Domain 3110 versus the input anamorphosis function.

Figure 14-145 Adubiaso Data Distribution Reproduction

Once the LSMU model is produced, it was validated with similar processes to other models. One additional validation is applied is to ensure the LSMU model lies close to the centre of the simulation cloud of grade tonnage curves, Figure 14-146 shows the grade tonnage curves for Domain 3110.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-146 Adubiaso Grade Tonnage Validation

The global grade tonnage curve is shown in Figure 14-147 for the LSMU model and simulation average. The LSMU model reflects the selectivity shown in the simulation realizations (discussed above) and is higher than that for the simulation average, as expected. The simulation average typically performs in a similar manner to that of a linear kriged estimation and gives an indication of what a smoother kriged model would look like in terms of selectivity.

Figure 14-147 Adubiaso Global Model Grade Tonnage Curve

14.8.5.2 Information Effect

It is common in most recoverable resource techniques to apply an information effect. The purpose of the information effect is to make an allowance that "perfect" selectivity of SMUs will never be achieved as mining selection will be based on a short-term model from grade control spaced drilling and a degree of smoothing will be present due to this. Information effect is generally applied as a variance reduction

when modelling the SMU distribution. In this case no information effect has been applied as there is already a reduced variance in the simulations.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.5.3 Mining Selectivity

This model has not been adjusted to represent mining selectivity for optimisation. The LSMU model using a conditional simulation approach with minimal smoothing, results in a high selective SMU block scale model. The degree of selectivity represented is much higher than that which will me achieved at the mining stage. Designed dig blocks that consolidate multiple SMU sized blocks into a larger contiguous mining shape to incorporate SMU blocks with grades below the desired cutoff (internal dilution) is recommended for mine planning.

14.8.5.4 Reconciliation

No grade control or production has been undertaken at this project, so no reconciliations can be made.

14.8.6 Classification of Mineral Resources

Drill spacing is the primary factor to define resource classification and only Indicated and Inferred resources are defined at Adubiaso. The 2014 Indicated classification used a nominal drill spacing of 20 x 20 metres, with the remainder being classified as Inferred. This spacing is inconsistent with other Asanko Gold deposits where a 40 x 40 metre drill spacing had been used to classify material as Indicated. A new classification scheme was proposed and applied (Table 14-88) and a comparison between 2014 and the current block classification is shown in Figure 14-148.

Table 14-88 Adubiaso Classification Criteria

Classification Category

Drill Spacing (m)

Use

Measured

Measured classification not applied

 

Indicated

40 x 40 drilling

Suitable for long-term mine planning

Inferred

80 x 80 drilling

Suitable for conceptual studies

Based on the amount of unknown artisanal mining, consideration should be given to downgrading all material within 15 metres of surface to Inferred in future Mineral Resource updates.

Figure 14-148 Comparison of 2014 and Current Block Classification


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

14.8.7 Reasonable Prospect of Eventual Economic Extraction

The Adubiaso mineralization is assumed amenable to open pit mining, and milling and recovery through CIL gold processing, and was evaluated for reasonable prospects for eventual economic extraction by constraining the Mineral Resources within a conceptual pit shell optimized in NPV Scheduler™. The assumptions used in preparing the conceptual pit, include mining and processing costs, metallurgical recovery, metal price and general and administrative costs, and are shown in Table 14-89 and approximately correspond to the 0.50 g/t Au Mineral Resource cut-off. See "Cautionary Note about Mineral Resources".

Table 14-89 Adubiaso Conceptual Constraining Pit Parameters

Parameter

Value

Gold Price (US$/ounce)

1,600

Mining Cost (US$/tonne)

1.025 - 1.647

Mining Cost Incremental (US$/Vertical 6m)

0.0043 - 0.0176

Mill Feed Transport (US$/tonne)

1.65

Process Cost (US$/tonne)

8.97 - 11.32

Gold Recovery (%)

94%

General and Administration (US$/tonne)

6.55

14.8.8 Mineral Resource Statement

The Adubiaso Mineral Resource estimate is reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

The Qualified Person is Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The effective date is February 28, 2022. The Mineral Resource estimate is reported assuming open pit mining and milling and CIL gold processing methods using a cut-off grade of 0.5 g/t Au, is constrained within a conceptual open pit prepared using NPV Scheduler™ software. The Mineral Resource estimates are summarized in Table 14-90. The estimated grades and tonnages for multiple cut offs are shown in Figure 14-149.

Table 14-90 Adubiaso Mineral Resource Estimate at a 0.5 g/t Au cut-off and $1,600/oz Au, as of February 28, 2022

Category Cutoff Grade
(g/t Au)
Tonnes (kt) Au (g/t) Au Metal Contained
(koz)
Measured 0.5 0 0 0.0
Indicated 0.5 1,554 1.80 90
Measured & Indicated 0.5 1,554 1.80 90
Inferred 0.5 213 1.38 9

Notes:

1. The Mineral Resource estimates are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014.

2. The effective date for the Mineral Resource estimates is February 28, 2022

3. Mineral Resource estimates account for mining depletion as of February 28, 2022

4. Reasonable Prospects for eventual economic extraction assume open pit mining with conventional gold processing and was tested using NPV Scheduler™ pit optimization software using several technical parameters including:

a. $1,600/oz Au price

b. $1.025/t to $1.647/t mining costs

c. $1.65/t mill feed transport costs

d. $8.79/t to $11.32/t processing costs

e. 94% Au recovery for all material

f. $6.55/t G&A

5. Applicable rounding has been applied to the stated tonnages, grades, and metal content to reflect the level of accuracy and precision of the estimate


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 14-149 Adubiaso Tonnage - Grade Curve for Indicated Mineral Resources

14.8.9 Factors That May Affect the Mineral Resource Estimate

Other than as discussed in other sections of this report there are no known environmental, permitting, legal, title, taxation, socio-economic, marketing, and political or other relevant issues that may materially affect the Mineral Resource estimates. Other relevant factors that may materially affect the Mineral Resources, including mining, metallurgical recovery, and infrastructure are reasonably well understood according to the assumptions presented in this Report.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

15 MINERAL RESERVE ESTIMATES

Not applicable at the current stage of the Project.

 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

16 MINING METHODS

Not applicable at the current stage of the Project.

 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17 RECOVERY METHODS

17.1 Process Description

The existing Asanko Gold Mine process plant located at Obotan is capable of processing approximately 5.8 Mtpa of total mill feed. Esaase material is being processed at present with supplementary feed from Akwasiso.

The key process operating criteria are shown in Table 17-1, the major equipment in Table 17-2 and the process block flow diagram in Figure 17-1.

Table 17-1 Key Process Plant Operating Criteria

Parameter

Units

Value

Crushing plant running time

Hours/annum (hpa)

5,957

Crushing plant feed rate

Tonnes per hour (tph)

975

Milling and carbon in leach (CIL) plant running time

hpa

7998

Milling and CIL plant feed rate

tph

725

Life of Mine (LOM) Au head grade

g/t

1.38

LOM gravity gold recovery

%

50

Run of Mine (ROM) feed size (F100)

mm

800

Semi-autogenous (SAG) mill feed size (F100)

mm

270

SAG mill feed size (P80)

mm

90

Leach feed size (F80)

µm

106

CIL retention time (8 stages)

hr

17.4

CIL slurry feed density

% w/w

50.2

CIL feed gold grade

Au g/t

0.69

LOM average CIL cyanide (NaCN) consumption

kg/t

0.45

LOM average lime (CaO) consumption

kg/t

0.98

Elution circuit type

 

Split AARL

Elution circuit size

t

5

Frequency of elution

batches/day

2

Note: AARL - Anglo American Research Laboratories


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 17-1 Process Plant Block Flow Diagram

Table 17-2 AGM Process Plant Major Equipment

Equipment Description

No. of
Units

Specification

Power (kW)

Nkran primary jaw crusher

1

CJ815

200

Nkran mobile jaw crusher unit

1

Model WJ1175

110

Nkran mobile jaw crusher unit

1

Model UJ440i

Diesel 

Primary SAG mill

1

Shell support; discharge pebble ports; 8.6 m diameter; inside shell: 4 m equivalent grinding length (EGL)

6,500

LRS /SER

Secondary ball mill

1

Shell support: overflow; 5.8 m diameter; inside shell: 9.1 m EGL

5,600

LRS

Gravity gold recovery scalping screen

3

Horizontal vibratory, 2.44 m width x 4.88 m length; aperture 3 mm x 19 mm

44 (4 x 11)

Gravity gold concentrator

3

KC-QS48 (G5 cone)

55

Gravity intensive leach reactor

2

2000 BA reactor; 3.2 m3

4

Gravity recovery electrowinning cells

2

12 cathode, 14 anode; 316 stainless steel (SS); 0.73 m (width) x 1.35 m (height) x 1.01 m (length); 1,000 A

12

Pre-leach trash screen

1

Horizontal vibratory, 3.05 m (width) x 6.10 m (length); aperture 0.8 mm x 8.8 mm

44 (4 x 11)

Pre-leach thickener

1

30 m diameter; high rate

11 (hydraulic)

CIL leach tank

8

14.0 m diameter x 14.3 m height; flat bottom; 2,100 m3 live volume

 

CIL tank agitator

8

XHH/90/15/90/M4PVSFK (MSRL) hydrofoil dual impeller

90

CIL inter-stage screens

8

MPS 1450(P); 14.5 m2; 304 L SS; aperture 800 µm

22

Elution column

1

5 t carbon capacity, 13 m3 total volume, SAF 2507 duplex SS

 

Regeneration kiln

1

Horizontal tube; tube 321SS, 750 kg

Diesel

Elution electrowinning cells

6

12 cathode, 14 anode; 316 SS; 0.73 m (width) x 1.35 m (height) x 1.01 m (length); 1,000 A

12

Note: LRS - Liquid resistance starter; SER - modern slip energy recovery drive; MSRL - mild steel rubber lined; SS - stainless steel


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17.2 Crushing

17.2.1 Esaase Source

ROM Esaase material P100 of 800 mm is loaded onto haul trucks which transports the material approximately 28 km to Obotan, where it is crushed in the crushing plant and thereafter joins the Obotan crushed material ahead of feeding to the milling circuit.

17.2.2 Obotan Source

The primary crushing circuit consists of a single tip with a dedicated ROM bin and a single jaw crusher in open circuit. Primary crusher product reports to the crushed ore stockpile (COS). The ROM (F100 800 mm, F80 500 mm) is loaded into a 100 t ROM bin by means of a front-end loader (FEL), or by direct tipping by haul trucks.

The ROM is drawn from the ROM bin at a controlled rate by a single, variable speed apron feeder, and fed directly to the jaw crusher. The speed of the apron feeder is controlled to maintain crusher throughput. Fine material spillage from the apron feeder reports to the primary crushing conveyor, where it is combined with the primary crusher product (P100 300 mm, P80 125 mm). The primary crushing conveyor is fitted with a belt magnet to remove any tramp iron material. The primary crushing conveyor discharges the crushed material onto the COS.

17.3 Milling

The milling circuit is configured as a SAG milling, ball milling, crushing circuit (SABC circuit) comprising a primary SAG mill, a secondary ball mill and a pebble crushing circuit. Mill feed is withdrawn from the 1,550 t COS by apron feeders feeding onto the SAG mill feed conveyor. A weightometer indicates the instantaneous and totalized crushed mill feed tonnage and is used to control the SAG mill feed rate via the apron feeders as well as the addition rate of supplementary Esaase oxide material. The SAG mill feed conveyor discharges directly into the SAG mill feed hopper. The SAG mill discharge is screened via a 15 mm x 50 mm aperture trommel screen before gravitating to the ball mill discharge sump. Screen oversize is conveyed to a single pebble crusher, where it is crushed to below 12 mm prior to recycling back to mill feed conveyor. The pebble crusher feed conveyor is fitted with a weightometer for control purposes. A SAG mill pebble bunker is installed, in which any pebble overflow is stored for further handling.

The SAG mill operates in open circuit, discharging directly into the ball mill discharge sump, and in closed circuit with the pebble crusher. The ball mill discharges into a sump from where the slurry is pumped to the cyclone classification circuit. A portion of the cyclone underflow (84% target) is diverted to the three gravity concentration units, each with its own scalping screen, which removes the oversize fraction and diverts this back to the ball mill discharge sump. The remaining cyclone underflow portion reports back to the ball mill discharge sump for further grinding. Gravity recovered gold concentrate reports to an intensive leaching reactor circuit (ILR) while the gravity tailings reports back to the ball mill discharge sump.

Cyclone overflow gravitates to the pre-leach thickening circuit, comprising a single high-rate thickener, where it is thickened to approximately 50% solids ahead of leaching and gold adsorption in the CIL circuit. Supernatant solution overflowing the thickener is recycled back to the process plant.

Quicklime is stored in a 100 t silo and is metered onto the SAG mill feed conveyor using a variable speed screw feeder. Quicklime is delivered to site by tanker and pneumatically transferred to the lime silo using an off-loading blower.

A ball loading system is used for loading of grinding media into the SAG mill (via the SAG mill feed conveyor).

Dust control is by way of a water dust suppression system at the stockpile area.

A mobile crushing array is used to assist with crushing of the ROM material, to optimize fragmentation and maintain throughput in the crushing circuit. Dust suppression, for dust control, is used at the crushing circuit.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17.4 Gravity Gold Recovery

Gravity concentrate originating from the three milling gravity recovery concentrators is treated in two ILRs. These reactors contain elevated levels of cyanide, caustic soda, catalyst and oxygen to enable maximum leaching of the precious metals in the concentrate. Leach residence time is approximately 8 hours. At the end of the leach cycle the pregnant solution is treated for gold recovery in two dedicated electrowinning cells to facilitate separate metallurgical accounting. ILR residue is pumped to the ball mill discharge sump. Average gravity recovery is approximately 50%.

17.5 Pre-leach Thickening

The secondary ball mill classification cyclone overflow stream gravitates to a horizontal vibrating trash removal screen, to remove any coarse particles, wood fragments, organic material and plastics that would otherwise become locked up with the circuit carbon and block the CIL inter-stage screens. The trash screen oversize reports directly to a trash bin, whilst the underflow reports to the pre-leach thickener, via a two-stage sampling system.

The pre-leach thickener is a high-rate thickener producing an underflow product of between 50% to 60% solids (w/w). The thickened underflow slurry is pumped to the CIL circuit by means of an underflow pump.

The thickener overflow product gravitates to the process water circuit. Flocculant and lime are added to the thickener feed.

17.6 Carbon in Leach (CIL)

The CIL circuit comprises 8 agitated tanks, numbered 0 to 7. This follows the conversion, in October 2021, of the pre-oxidation tank to CIL operation. This is now designated as Tank 0. Slurry and carbon flows are counter current with loaded carbon pumped upwards in the circuit and exiting at either Tank 0 or Tank 1. The slurry gravitates from Tank 0 to 7 through inter-stage screening (vertical, mechanically swept wedge wire screen) in each tank (facilitating carbon retention), exiting from CIL Tank 7 over a carbon safety screen, to recover any stray carbon particles. Each of the tanks contains a bypass facility which allows the removal of any tank from service for maintenance while CIL operation is continued.

Oxygen (90% purity) from the three, pressure swing absorption (PSA) plants, is added to all tanks. The first tank has 3 intensive reactor injection units installed in the slurry feed line in addition to the oxygen sparging in the tank to elevate the dissolved oxygen level to approximately 20 ppm. The remaining tanks are sparged with oxygen to target 17 ppm dissolved oxygen. This process enhances the dissolution of oxygen into the leach slurry, minimizing cyanide consumption and improving gold leach kinetics by increasing the dissolved oxygen concentration

Total slurry residence time is approximately 17.4 hours. Carbon concentration per stage is 11 g/L with an anticipated loaded carbon value of 1,250 g/t in the first CIL tank. Daily loaded carbon throughput is approximately 10 t.

17.7 Tailings and Detoxification

As per International Cyanide Management Code (ICMC) guidelines, the CIL tailings needs to be discharged with a final cyanide concentration of less than 50 g CNWAD/m3 at the TSF spigot.

The current plant operating parameters result in no need for cyanide detoxification of the CIL tailings as the CNWAD values are generally below the 50 ppm compliance standard.

However, provision has been made to use the INCO air/SO2 process for cyanide detoxification. The current detoxification circuit comprises a cyanide destruction feed box, gravity feeding into a single agitated tank, with a blower air sparging facility.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The detoxification process utilizes SO2 and air in the presence of a soluble copper catalyst to oxidize cyanide to the less toxic compound cyanate (OCN). Sodium meta-bisulphite (SMBS) is used as the SO2 source and is dosed into the cyanide destruction feed box as a 20% weight/volume (w/v) solution. The detoxification process requires the presence of soluble copper to act as a catalyst and to ensure that any free cyanide present is bound to copper as a CNWAD component. Provision is made for the preparation and dosing of a copper sulphate solution, for dosing to the cyanide destruction feed box as a 15% w/v solution when required. Oxygen required in the reaction will be supplied by sparging of blower air into the cyanide detoxification tank. The reaction is carried out at a pH of 8.5 which is maintained by controlled lime addition to the cyanide destruction feed box. The detoxified tailings are then pumped to the TSF. Supernatant TSF water is recovered via a barge pump and recycled to the plant as process water.

17.8 Carbon Treatment

Carbon is received from the loaded carbon recovery screen and loaded directly into the acid wash column. The carbon treatment circuit is designed to handle a batch size of 5 t of loaded carbon per elution. Based on the mass balance, an average of 60 elutions are required per month. The circuit comprises cold acid washing, using a solution of 3% HCl concentration, to remove inorganic foulants such as carbonates, a split AARL elution process operated at approximately 125°C, using an eluant solution comprising 3% NaCN and 3% NaOH, regeneration of the eluted carbon in a rotary kiln at 750°C to remove organic foulants such as grease and oils, and ultimately electrowinning of the pregnant solution in four dedicated electrowinning cells situated in the gold room.

The elution process may be described in more detail as follows. The caustic solution is pumped into the strip (elution) solution make-up tank from the caustic mixing tank and the cyanide solution is pumped from the cyanide dosing tank. The reagents are mixed with filtered raw water in the strip solution make-up tank at the correct concentrations. When the elution column is filled, the strip solution pump turns on and pumps the strip solution through the recovery heat exchangers followed by the primary heat exchangers before entering the bottom of the elution column at 125°C. The strip solution is recycled through the carbon column via the strip solution pump, at a flow rate of two bed volumes per hour (BV/h) equivalent to 20 m3/h, for a total of 50 minutes resulting in a carbon strip (removal of gold from the carbon). Eluate produced during the elution cycle is pumped to either one of the two eluate storage tanks located in the electrowinning area.

The fresh strip solution cycle is followed by a spent solution cycle. During this cycle, the rinse solution from the previous elution (stored in the intermediate solution tank) is circulated through the elution column at 125°C a rate of two BV/h (20 m3/h) for 150 minutes. Once the cycle is complete, the spent solution is pumped to either one of the two eluate storage tanks.

Following this, the rinse cycle involves pumping water for 150 minutes at a rate of two BV/h through the elution column and storing the resulting solution in the intermediate solution tank for the spent solution cycle in the subsequent elution cycle. On completion of the elution cycle, cooling water is pumped from the intermediate solution tank, through the elution column at a rate of two BV/h for 30 minutes and reports to the CIL circuit.

Eluted carbon is removed from the elution column and transferred to the carbon regeneration kiln, via the static sieve bend drainage screen, by means of pressurized water. Drained carbon gravitates to the carbon regeneration kiln feed bin from where it is fed to the carbon regeneration kiln. The regenerated carbon is collected in the barren carbon quench tank, from where it is pumped to the carbon dewatering screen for re-introduction to the CIL circuit via CIL Tank 6 or CIL Tank 7.

17.9 Electrowinning

Currently the pregnant leach solution (PLS) from the ILR is collected in the ILR pregnant solution storage tank. This pregnant solution is circulated through two dedicated electrowinning cells via a common steady head tank.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Pregnant solution from the carbon elution circuit is collected in either one of the two eluate storage tanks. This solution is circulated through a dedicated electrowinning circuit consisting of four cells operating in parallel via a common steady head tank.

Gold is deposited on the electrowinning cell cathodes as a sludge while the solution is circulated until the desired barren gold concentration is achieved, or the cycle time has elapsed. After completion of an electrowinning cycle, barren solution is sampled before being pumped to the CIL feed. Loaded cathodes are removed periodically from the cells, the gold sludge is washed off using a high-pressure washer after which the washed solution is decanted.

Hydrogen cyanide, ammonia, and hydrogen gas detection equipment is installed in the electrowinning circuit, together with relevant extraction and ventilation systems.

17.10 Gold Room

Electrowon gold is recovered from the cathodes and the electrowinning cells using high pressure water jet sprays. The precious metal slurry is then filtered and dried in a drying oven at approximately 110°C to remove associated moisture. Once dried the precious metal powder is smelted in the melting furnace at approximately 1,700°C with fluxes, such as borax, sodium carbonate and silica to remove base metallic impurities such as copper, iron etc. The molten bullion mixture is then poured in moulds, allowed to solidify, cleaned, sampled and stamped with the mine name and sequential bar number. Gold content varies from 85% to 90%, with approximately 10% silver and approximately 2% to 5% base metal content. The bars are dispatched periodically to a refiner for production of 99.99% gold bars. Slag from the smelting may be re-smelted if the gold content warrants this or be returned to the SAG mill for recovery through the circuit. Additional equipment in the gold room includes safes, scales, and various security systems.

17.11 Reagents

17.11.1 Flocculant

Flocculant is delivered to site dry in 25 kg bags and is added manually to the flocculant hopper. The flocculant is then fed into a venturi tube by a screw feeder, where it is pneumatically transferred into a wetting head. The dry flocculant is mixed with filtered raw water up to a 33% (w/v) solution and discharged into the flocculant mixing tank where additional raw water is added. After a suitable hydration period under agitation, the flocculant solution is pumped to the flocculant storage and distribution tank, from where it is dosed to the respective areas by means of a ring main system fed via a duty/standby variable speed pumping arrangement.

17.11.2 Copper sulphate

The current installation allows for the delivery of copper sulphate in 1.25 t bulk bags, and manual addition to the mixing tank using a hoist and a bag breaker system. Provision is made for the addition of filtered raw water to the mixing tank to dilute the copper sulphate to a 15% (w/v) solution. The copper sulphate solution gravitates from the mixing tank to the dosing tank, from where it can be dosed directly to the plant CIL tailings cyanide detoxification circuit via a duty/standby variable speed pumping arrangement when required. Copper sulphate spillage is pumped to the CIL tailings cyanide detoxification circuit.

17.11.3 Sodium Metabisulphite (SMBS)

The existing installation allows for the delivery of SMBS in 1.2 t bulk bags and manual addition to the mixing tank using a hoist and a bag breaker system. Provision is made for filtered raw water addition to the mixing tank to dilute the SMBS to a 20% (w/v) solution. When required, the diluted SMBS solution will be pumped from the mixing tank to the dosing tank, from where it will be dosed directly to the cyanide detoxification circuit and reverse osmosis (RO) plant via a duty/standby variable speed pumping arrangement.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17.11.4 Diesel

Diesel is delivered to the plant site by the fuel tanker and stored in a diesel storage tank for distribution to the generators associated with the fire water system, elution circuit, carbon regeneration kiln and the gold room.

17.11.5 Caustic Soda

Caustic is delivered to site in 1 t bags of 'pearl' pellets. The bags are hoisted by a crane into the mixing tank via a bag breaker system. The caustic soda is diluted with filtered raw water up to a final solution concentration of 20% (w/v). The diluted caustic solution is pumped from the mixing tank to the dosing tank, from where it is dosed to the respective areas (ILR, elution, and electrowinning) by means of a duty/standby variable speed pumping installation.

17.11.6 Sodium Cyanide

Sodium cyanide is delivered as dry briquettes in 1 t boxes and added manually via a hoist and bag breaking system into the mixing tank. Filtered raw water is used to prepare a 20% (w/v) solution in the mixing tank. The diluted solution is pumped from the mixing tank to the dosing tank, from where it is distributed by means of dedicated variable speed dosing pumps.

17.11.7 Hydrated Lime

Hydrated lime is delivered dry in 1 t bulk bags, and manually loaded to the lime make-up tank via a hoist and bag breaker system. The hydrated lime is fed into the lime make-up tank by means of a screw feeder. Filtered raw water is added to the make-up tank to produce a 20% (w/v) solution. The diluted milk of lime is distributed throughout the plant by means of a ring main system fed by a fixed speed duty/standby pumping installation.

17.11.8 Ferric Chloride

Ferric chloride is delivered in 25 kg bags which are manually loaded via a hoist and bag breaking system into the mixing tank. Filtered raw water is added to the mixing tank to prepare a 20% (w/v) solution. The diluted solution is dosed directly from the mixing tank to the return water treatment circuit, by means of a variable speed, duty/standby pumping installation.

17.11.9 Hydrochloric Acid

Hydrochloric acid is delivered in 1,000 L bulk containers at a solution strength of 33% w/v. This is used to acid wash the pregnant carbon prior to gold elution taking place.

17.11.10 Quicklime

Quicklime is delivered in 36 t bulk tankers and pneumatically off-loaded from the tanker into the lime silo. The lime is extracted from the silo using a variable speed screw feeder and dosed directly onto the SAG mill feed conveyor. A suitable dust extraction system is installed on the quicklime dosing system.

17.11.11 Anti-scaling Agent

The anti-scaling agent is delivered in 1 t intermediate bulk containers, from where it is pumped to the anti-scalant storage tank. The anti-scalant reagent is pumped from the storage tank, through the elution heat exchangers, back to the storage tank.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17.11.12 Activated Carbon

Fresh activated carbon is delivered in 500 kg bulk bags. The fresh carbon is added to the carbon quench tank using a hoist, as required for carbon make-up to the CIL circuit. The addition point will allow attrition of any friable carbon particles with subsequent fines removal on the sizing screen prior to entering the CIL tanks.

17.11.13 Grinding Media

The forged steel (125 mm diameter) grinding media is used in the SAG mill, while 60 mm grinding media is used in the secondary ball mill.

Grinding media is delivered in 200 L drums. SAG mill balls are added to the mill using a hydraulic ball feeder which discharges directly onto the mill feed conveyor. Secondary ball mill media is added to the ball mill feed box by use of a specially designed kibble and hoist, which safely transports the media from the loading area to the feed box.

17.12 Plant Process Services

17.12.1 Filtered Raw Water

Raw water is currently supplied to the plant raw water storage tank from the pit dewatering boreholes and several borehole pumps. Additional raw water is sourced from the Sediment Control Structure 4 and pumped to the plant raw water tank, via the raw water treatment plant.

Provision has further been made on site to route tailings return water to the plant raw water storage tank via the discharge water treatment settling and RO plant.

The raw water is used for gland service, carbon transfer duties, elution, gravity concentrator circuit water, and reagent make-up.

The raw water storage tank has a reserve of water for fire-fighting purposes. This reserve is maintained by suitability positioned fire water and raw water pump suctions.

17.12.2 Fire Water

Firewater is drawn from the raw water tank. The firewater pumping system contains:

Fire hydrants and hose reels are placed throughout the process plant, fuel storage and plant offices at intervals that ensure coverage in areas where flammable materials are present.

17.12.3 Potable Water

Potable water is taken from the borehole water line. It is pumped through a water treatment plant before being stored in the potable water tank. The potable water tank feeds the plant potable water tank, from where the plant and mining potable water is distributed.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

17.12.4 Process Water and Plant Run-off

Plant run-off is contained in the pollution control dam, from where it is pumped to the plant process water dam.

The plant process water dam collects the water from the pit-dewatering pumps, TSF return water, and any plant run-off from the pollution control dam. Provision is made for a raw water make-up stream, as required. Filtered water to the plant gravity concentration circuit is supplied by a dedicated pump system, while the remainder of the process water reticulation is undertaken by means of a duty/standby pumping arrangement. Provision is made in the design for the treatment of excess process water prior to discharge to the environment.

17.12.5 Discharge Water Treatment

The plant design allows for the treatment of the excess process water in a mechanically agitated arsenic precipitation tank, where ferric chloride would be dosed to precipitate out arsenic from solution (in the presence of oxygen), at a pH of 6. Provision was made for lime addition and hydrochloric acid addition to this tank, as required for pH control. The current design allows for the treated water to overflow to an intermediate transfer tank, from where it is pumped to a RO water treatment plant, complete with pre-filters, prior to discharge. Filter cake product from the RO plant filters will be re-pulped with RO brine in the arsenic waste disposal tank, from where it will be pumped to the final tailings disposal circuit.

17.12.6 High Pressure (Compressed) Air Reticulation

Plant instrument and plant air at 8.0 bar pressure are supplied by a dedicated, duty/standby compressor installation. The compressed air is stored in the instrument air receiver while a dedicated air receiver, located in the milling area, is provided for plant air storage, and is fed from the main instrument air receiver.

All compressed air is dried and filtered prior to storage in the instrument air receiver, from where it is reticulated throughout the plant for instrument air requirements.

17.12.7 Low Pressure (Blower) Air Reticulation

A total of three low pressure blowers supply air to the water treatment circuits.

17.12.8 Oxygen Reticulation

The plant currently utilizes a 15 tpd oxygen plant (comprising three modules of 5 tpd each) to generate oxygen at 90% purity and 300 kPa pressure, for use in the ILR, pre-oxidation, and CIL circuits. The oxygen is stored in the oxygen plant air receiver from where it is distributed.

17.12.9 Return Water and Return Water Treatment

The TSF return water is pumped from the TSF via a duty/standby pumping installation to the plant process water circuit. AGM has made provision for the routing of the TSF return water to the discharge water treatment and RO plant for treatment prior to discharge to the plant raw water tank, to supplement the raw water requirement.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

18 PROJECT INFRASTRUCTURE

18.1 Overview

18.2 Existing Infrastructure

The Obotan plant commenced production in early 2016. The plant was erected close to the Nkran deposit and several satellite orebodies. The plant is currently processing 5.8 Mtpa of material.

18.2.1 Obotan - Existing Site Infrastructure

Current site infrastructure at Obotan includes:

18.2.2 Esaase - Existing Site Infrastructure

Current infrastructure at Esaase includes:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

18.2.3 Esaase-Obotan Haul Road

The 28 km Esaase to Obotan haul road was upgraded in 2019 to support annual haulage rate of 3.0 - 3.6 Mtpa. Table 18-1 below summarizes the main design criteria for the road upgrade:

Table 18-1 Esaase to Obotan Haul Road Upgrade - Summary of Design Criteria

Description

Specification

Lane width

3.5 m - 4.5 m

Shoulder width

1.0 m - 1.5 m

Road width

9.0 m -12.0 m

Maximum design speed

60 km/h (50 km/h with the current design)

Maximum gradient

10% (1:10)

Cross fall slope

3% (recommended - 1% to 4%)

Base and Sub-base

Selected Graded Material

Surfacing

Compacted Gravel wearing course (no seal)

Finished road level

700 mm above NGL (200 mm-700 mm above NGL)

18.3 Site Layout

18.3.1 Obotan Layout

The processing plant area is well established on two bulk earthworks terraces with all the major infrastructure already in place. Figure 18-1 shows the Obotan site plan and surrounding infrastructure.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Figure 18-1 Obotan Site Plan and Surrounding Infrastructure
Source: Asanko Gold Mine, 2021

Figure 18-2 shows a closer view of the processing plant.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 18-2 Process Plant Layout
Source: Asanko Gold Mine, 2021

18.3.2 Esaase Layout

The Esaase site plan and the surrounding infrastructure is illustrated below in Figure 18-3.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 18-3 Esaase Site Infrastructure Layout
Source: Asanko Gold Mine, 2021

18.3.3 Haul Road Esaase to Obotan

The Esaase to Obotan haul road is a distance of approximately 28 km. The haul road route goes through thick vegetation, farmlands and galamsey area. It also crosses various local gravel roads, one paved district road and a few overhead power lines.

Figure 18-4 illustrates the haul road layout.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 18-4 Asanko Gold Haul Road - Overall Site Infrastructure Layout
Source: Asanko Gold Mine, 2021


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

18.4 Site Access

The Esaase site is accessed by existing public roads from two directions through three routes:

Roads from both directions are gravel topped for the last 20 km to the Esaase site. Conditions of these roads can be described as fair to poor.

The process plant is also accessed by an existing public road, namely the Kumasi / Manso Nkwanta road (sealed road), with the last 12 km being AGM's private haul road.

18.5 Waste Rock Dumps

Waste rock dumps (WRD) associated with mining operations are constructed to meet the requirements of the Ghanaian Mining Regulations and AKOBEN guidelines. The WRDs have been initially constructed with the natural rill angle of approximately 35° with 10 m lifts and 17 m berms. This is then contoured progressively to an overall slope angle of 18.5° (1:3) to allow for slope stability and re-vegetation.

The WRDs will be progressed by tipping from a higher level against a windrow and progressively pushing the waste out with a dozer. Geochemical testwork identified that the waste rock for Esaase and Nkran was non-acid generating. The WRDs locations for Nkran, Esaase and the Satellite Pits are shown on the site layout diagrams, in Figure 18-1 and Figure 18-3.

The waste dumps will be progressively rehabilitated with topsoil, where possible. Progressive rehabilitation has been undertaken where possible to date. Surfaces of dumps will be contoured to minimize batter scour and ripped at 1.5 m centres to a depth of 400 mm, where practicable. Seepage and shallow ground water flow along the perimeter of the mine residue deposits are controlled with suitable toe drains.

Select waste rock from Nkran will be used for future TSF stages where practical.

18.6 Tailings Storage Facility

The Tailings Storage Facility is located near the process plant and consists of multi-zoned downstream raised perimeter embankments.

Refer to Section 20 for details of the Tailings Storage Facility.

18.7 Storm Water Management

18.7.1 General

The surface water management system consists of two separate systems:

Water accumulated within the clean water system is diverted around areas of disturbance and directed towards the natural watercourses.

Water accumulated in the dirty water system is either harvested for use or routed through sediment control structures prior to discharge to the environment. Water will only be discharged to the environment if it meets EPA sector specific effluent guidelines for mining and is approved by the environmental manager.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

18.7.2 Sediment Control Structures

This infrastructure includes a network of water storage dams (ponds) and sediment control structures.

Four sediment control structures were constructed at Obotan. The sediment control structures were designed per the EIS to have embankment slopes of 1:3 for both the upstream and downstream ends of the Zone A Fill embankment with a 6m width. The embankment height is 2.0 m with 1.5 m height to the spillway.

Based on the site topography, the run-offs from the waste rock dumps heads toward the sediment control structure with majority heading towards the Sediment Control Structure No. 4. Water is pumped from the sediment control structure back to the process plant for processing.

All run-offs from the processing plant are captured in the downstream drains and directed towards the Pollution Control Dam (PCD). Water from the PCD is pumped back to the processing plant. In the event of a spill, the water is directed towards Sediment Control Structure No. 4 for controlled discharged into the environment when EPA standards are met.

A 1,920 m3/day N2 Water Treatment Plant has been constructed at Esaase to treat the water pumped from the Esaase pit and pit dewatering boreholes. The plant features three storage ponds (Feed Pond, Sediment Pond, and the Discharge Pond) with a combined holding capacity of 27,000 m3. The treated water is discharged into the Bonte river.

18.8 Potable Water Supply

Potable water demands for the Esaase mine services area and camp are supplied by ground water boreholes.

There is basic water treatment infrastructure at the Esaase camp already in place.

18.9 Sewage Handling

Sewage is currently collected in tanks, then pumped to a contractor's truck and discharged at the Obotan sewage treatment plant.

18.10 Power

Power is supplied to Obotan and Esaase from two different generation sources and two different distribution systems.

18.10.1 Power Supply - Obotan

Power to the existing Obotan plant is generated by the Volta River Authority (VRA) and transmitted from the Asawinso sub-station via a 161 kV overhead line, owned and operated by Ghana Grid Company Limited (GRIDCo). The capacity of the overhead line feeding the plant is 150 MW, which far exceeds the estimated power requirements for LOM.

18.10.2 Power Supply - Esaase

Power to Esaase is supplied by ECG and transmitted from the ECG network via a 33 kV overhead line. The 33 kV distribution network is in place throughout the Esaase mine.

18.11 Fuel

Diesel is supplied by road from Takoradi and stored at existing fuel farms at both Nkran and Esaase. The fuel farms are operated by the fuel transport contractor, Zen Petroleum.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

19 MARKET STUDIES AND CONTRACTS

19.1 Introduction

The commodity produced at AGM is gold, which is widely and freely traded on the international market with known and instantly accessible pricing information.

19.2 Marketing Strategy

The marketing approach for any future gold production is the same as that used for AGM production since commercial production commenced in Q1 2016.

The three key elements of marketing strategy are as listed. Gold, as doré bar, is:

19.3 Marketing Contracts

19.3.1 Refining Contract

The gold refining industry is competitive with several gold refineries in South Africa, India, Switzerland and several other countries that have the capacity to refine gold from AGM.

AGM refines all doré bars produced at Rand Refinery under a one-year contract that commenced on August 1, 2021. The contract was awarded to Rand Refinery after an open tender on competitive terms.

The contract specifies a standard refining charge. This charge is credited for payables (e.g. silver content of the doré) and debited for any deleterious content (e.g. arsenic) in accordance with specific terms in the contract.

19.3.2 Off-take Agreement

AGM has an off-take agreement to sell 100% of the future gold production up to a maximum of 2.2 Moz to the original project lender, Exp T2 Ltd ("Red Kite"). Arrangements for sale of production after this agreement is satisfied will be reviewed as required.

As of December 31, 2021, the AGM has delivered 1,299,256 ounces to Red Kite under the offtake agreement.

19.4 Pricing

The off-take agreement specifies that the buyer can nominate the purchase price, being either the London Gold Market AM fixing price as publish by the London Bullion Market Association or London Gold Market PM price or Comex (first position) settlement price during the nine-day quotation period following shipment from site. In practice, the buyer nominates the lowest of the spot prices during that period as the purchase price.

19.4.1 Payment Terms

Under the off-take agreement, the buyer pays for 100% of the value of the gold nine business days after shipment from the mine.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

A provisional payment of 90% of the estimated value is made within one business day after receipt of the gold credits by the buyer, which is typically 3 or 4 business days after shipment from the mine.

19.5 Product Specification

The product specification is defined in the refining contract.

19.6 Shipping, Storage and Distribution

Transport of doré bars from mines across Africa to refineries in South Africa and elsewhere is a relatively common occurrence. For the AGM mine, transport of doré bars from AGM is the responsibility of the refinery. The doré bar is transported from the mine site via helicopter.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20 ENVIRONMENTAL STUDIES, PERMITTING & SOCIAL / COMMUNITY IMPACT

This section provides an overview of the environmental legislation and guidelines applicable to the AGM, as well as a summary of the permitting process and stakeholder engagements conducted in respect of the mine.

20.1 Ghanaian Legislation and Guidelines

20.1.1 Environmental and Social

The key environmental and social legislation in Ghana are the Environmental Protection Agency Act 1994 (Act 490) and the Environmental Assessment Regulations 1999 (LI 1652). The Environmental Protection Agency (EPA) is the regulatory body that administers these laws.

The Environmental Protection Agency Act 1994 (Act 490) establishes Ghana's EPA and defines the various functions of the EPA two of which are as follows:

The Environmental Assessment Regulations 1999 (LI 1652) support the Environmental Protection Agency Act 1994 (Act 490) and describe the process of environmental assessment in Ghana.

Proponents of undertakings that have a significant adverse impact on the environment (as defined in Schedule 2 of these Regulations) must submit an Environmental Impact Statement (EIS) to the Agency in accordance with the EPA LI1652 obligations. It is instructive to note that the scope of the EIS covers both the biophysical and the socio-economic impacts of the project.

Though not expressly stated in the law, the Agency has some discretionary powers in Clause 2 (LI1652) to establish some additional guidelines based on their technical judgment. In this context, the submission of an EIS is required for any mining project where the mining lease covers an area greater than 10 hectares. The regulations outline the environmental and social aspects that must be addressed in an EIS. This includes addressing the possible direct and indirect environmental impacts of the proposed undertaking during pre-construction, construction, operation, decommissioning (i.e., mine closure) and post-decommissioning phases.

As a first step, an Environmental Scoping Report must be prepared for, and approved by, the EPA prior to submitting an EIS. The purpose of the scoping document is to set out the scope of works for the EIS and must include its draft terms of reference.

In accordance with the traditional regulatory approach, a number of legally binding conditions for mitigating biophysical and social impacts of the project must be carried out once an Environmental Permit is obtained.

These typically include:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.1.2 Minerals and Mining

The Minerals Commission is the principal regulatory body of the mining industry in Ghana. It was established under the Minerals Commission Act, 1993 (Act 450) for the "regulation and management of the utilization of the mineral resources (of Ghana) and the co-ordination of policies in relation to them".

The Minerals and Mining Act, 2006 (Act 703) aims to:

Subject to Section 72 of the Minerals and Mining Act, 2006 (Act 703) the holder of a mineral right must have due regard to the effects of mineral operations on the environment and must take whatever steps necessary to prevent pollution of the environment as a result of mineral operations.

The Minister may, as part of a mining lease, enter into a Stability Agreement with the holder of the mining lease to ensure that the holder will not, for a period of up to 15 years, be adversely affected by a new enactment, changes to an enactment, or be adversely affected by subsequent changes to the level of, and payment of, royalties, taxes, customs or other related duties. The Stability Agreement becomes effective upon ratification by Ghana's Parliament.

Where the proposed investment to be made by the mining company will exceed US$500 million, the Minister may, on the advice of the Minerals Commission, enter into a development agreement under the mining lease.

The development agreement may contain provisions relating to:

The development agreement is also subject to the country's Parliamentary ratification in order to make it effective.

The Minerals and Mining (health, safety and technical) regulations provide mining, health, safety and environmental requirements that must be met by a mining lease holder.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

In addition to the Minerals and Mining Act, 2006 (Act 703), seven subsidiary legislations regulate the various aspects of mining operations in Ghana. These are:

1. Minerals and Mining (General) Regulations 2012

2. Minerals and Mining (Licensing) Regulations 2012

3. Minerals and Mining (Support Services) Regulations 2012

4. Minerals and Mining (Compensation and Resettlement) Regulations 2012

5. Minerals and Mining (Explosives) Regulations, 2012

6. Minerals and Mining (HSLP and Technical) Regulations 2012.

7. Minerals and Mining (Local Content and Local Participation) Regulations 2020 (LI 2431)

20.1.3 Compensation

Acquisition and access to land in Ghana for development activities, including mining, may be undertaken either through the State's power of eminent domain, or by private treaty. The taking of land requires the payment of due compensation. The regulatory oversight of private sector land acquisition and resettlement related to mining activities and actions is governed by the Constitution of Ghana and two legislative acts:

The Minerals and Mining Act, 2006 (Act 703) vests all mineral rights in land to the State and entitles landowners or occupiers to the right for compensation. Section 74 (1) requires compensation for:

20.1.4 Health, Safety and Labour

The principal health, safety and labour laws applicable in the mining industry include:

Provisions in the mining law state in part that a holder of a mineral right shall give preference in employment to citizens of Ghana "to the maximum extent possible and consistent with safety, efficiency and economy."

As with other sectors, a foreign employee in the mining sector needs a work and residence permit in order to work.

However, under the mining laws of Ghana, there are immigration quotas in respect of the approved number of expatriate personnel mining companies may employ.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.2 Permitting Process

20.2.1 Obotan Permits

Two key regulatory permits were required for the Asanko Gold Mine as follows:

Following the required engagements, regulatory site visits, and submission of the relevant documentation, the Asanko Gold Mine has successfully obtained and renewed its Mine Operating Permits since commencement of operation in 2016 and is currently operating under the 2021 MOPs issued on January 12th 2021 in respect of the following leases, all of which form part of the operational complex of the Asanko Gold Mine:

The latest Environmental Certificate for the Asanko Gold Mine (gold mining and mineral processing) was issued on July 30th 2021, and is valid for three years following which it will be due for renewal.

20.2.2 Esaase Permits

Asanko Gold (formerly known as Keegan Resources) acquired the Esaase concession in 2006 and, under an exploration permit issued by the Minerals Commission, conducted extensive geological survey and drilling program to define its Mineral Reserves.

Following completion of this work stream, and preliminary establishment of a business case, a mining area application was submitted to the Minerals Commission in 2012 which defined the location of the proposed mine on the concession as well as locations of the pits, waste rock dumps and other related mining infrastructure and facilities.

The mining area application was approved by the Minerals Commission and a Temporary Mine Operating Permit issued that same year.

In 2014, further work was conducted to optimize the Project. The Minerals Commission was regularly updated on the Project and a formal application was submitted to the Minerals Commission in December 2016 which led to issuance of the permanent MOP for the Esaase concession in January 2017. The permanent Esaase MOP, as with all other Asanko mining leases, has since been successfully renewed annually in line with regulatory requirements.

20.2.3 EPA Permitting Process for Esaase

The Figure 20-1 depicts the sequence of activities that had to be completed in accordance with the EPA environmental permitting process.

This necessitated the hiring of a Ghanaian environmental management consulting firm, the African Environmental Research & Consulting Company (AERC), to carry out the required activities.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The process commenced with formal consultations with the EPA on the proposed plan to develop the Esaase gold project followed by submission of an Environmental Impact Assessment (EIA) application for the project which included its basic technical details.

In this regard, the required EPA Form EA2 application was filed with the EPA on June 12th 2015 for the proposed mine development at Esaase, as well as the originally planned 27 km long overland conveyor from Esaase to Obotan.

In line with the permitting process, the EPA responded to the EA2 submission by requesting Asanko Gold to conduct an EIA in respect of the proposal and submit an Environmental Impact Statement (EIS) in line with the requirements of their EIA procedures.

A Scoping Report, with draft terms of reference for the EIA, was prepared and subsequently submitted to the EPA in December 2015.

Figure 20-1 EIA Approach for the Esaase Project

Following this, work was undertaken on the EIA which entailed:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

In attendance at that were:

The ceremony was chaired by Dr. Richard Amankwah Kuffour, a lecturer at the University of Education (UEW), Winneba, Ghana.

The then General Manager of the Asanko Gold Mine, Mr. Charles Amoah, gave an overview of the project highlighting its impacts and the interventions to be implemented by the Company to mitigate these. He further enumerated the financial and socio-economic benefits of the Project to all stakeholders, including the Government of Ghana, and the local communities.

In an open forum, members of the community, as well as the chiefs of each of the 12 communities, publicly declared their support for the project and expressed their expectation that the expansion projects will create jobs for the youth in the community and also lead to socio-economic development of the catchment area.

The positive outcome of this key EIA activity (i.e. the public hearing) was pivotal to the permitting process and an account of the event formed an integral part of the Draft EIA developed in respect of the Project.

Select community members and chiefs at the EPA public hearing are shown in Figure 20-2 and Figure 20-3.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 20-2 Community Members at the EPA Public Hearing

Figure 20-3 A Cross Section of Chiefs and Members of the Community at the EPA Public Hearing

The various findings of the respective EIA activities were subsequently compiled into the Draft EIS which was submitted to the EPA as a sequel to the Scoping Report on September 30th 2016. The Draft EIS outlined the project description, its potential impacts and mitigations, proposed environmental monitoring action plans, provisional environmental management plans and reclamation, and closure alternatives of relevance to the mining undertaking.

The EPA reviewed the Draft EIS and reverted with their comments and queries as well as invoices for the permit processing fees. This effectively marked technical approval of the project by the EPA.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The Draft EIS was revised and submitted to the Agency on November 30th 2016, after the EPA's comments were incorporated. This was followed by payment of the EPA's invoice for the issuance of the environmental permit.

An updated Environmental and Social Impact Assessment (ESIA) was prepared by the AGM and submitted to the EPA during 2017 to incorporate a 27-kilometre haul road, to facilitate truck ore haulage from Esaase to Obotan. This ESIA was approved by the EPA and an Environmental Permit issued for the expanded Obotan Gold Mining and Processing Project (permit received in August 2019). The 27-kilometre overland conveyor was removed from the May 2020 version of the EPA Permit at the request of the AGM.

20.3 Stakeholder Engagement

20.3.1 Guiding Principles of Stakeholder Engagement

Extensive interactions were held with various stakeholder groups including the government, regulatory authorities and, particularly, members of communities that would be impacted by the development of Esaase as well as expansion projects at Obotan.

These interactions were guided by Asanko Gold's principles of conducting stakeholder engagement in a manner that is:

Further to these, there were extensive stakeholder engagements to ensure that, apart from legal and regulatory consent to the project, affected communities were fully informed about the project, its potential technical and socio-economic impacts on them, interventions to mitigate these impacts, among others, so the communities could make the decision on whether or not to allow the Project to be implemented on their land.

20.3.2 Engagement with Communities

The AGM has a catchment area which straddles parts of the Amansie South and Amansie West Districts of the Ashanti Region of Ghana. The mine's catchment area has thirty five (35) villages and approximately 135,000 inhabitants, based on the 2010 Ghana population census. Of these thirty five communities, three (Nkran, Tetrem and Esaase) are directly impacted thereby necessitating either a partial or total resettlement. The partial resettlement of Nkran was successfully completed in 2015 whereas the total resettlement of Tetrem was completed in 2021. The relevant Resettlement Action Plan processes are currently in progress with respect to the planned partial resettlement of Esaase.

Formal consultations regarding various aspects of the then AGM Obotan Gold Project were conducted from as far back as 2011 through:

1. Engagements with various government entities including relevant ministries, departments and agencies as well as the local government i.e. district assemblies,

2. Engagements with Project-affected-Persons in the catchment Area, and

3. The formal Environmental and Social Impact Assessment Scoping Process which included holding of a Public Hearing involving all stakeholders of the project.

As a result, the AGM has consistently, and directly, engaged with the affected catchment communities since commencement of the Obotan project.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Principal engagement methods and venues to date have included:

A grievance management process was also instituted to ensure all community concerns were documented, reviewed, necessary actions taken, and timely feedback provided to affected community members. Grievances are resolved between 14 to 30 days from the date of complaints.

The AGM further engaged additional community liaison officers to enhance the frequency and quality of interactions, particularly with the immediate communities, and also to build trusting relationships with stakeholders even before commencement of the Project.

A stakeholder engagement and Action Plan was developed, with broad stakeholder groups and committees established in the communities, to keep members of the communities fully updated on the project and to deepen their relationship with Asanko Gold, thereby building a strong linkage with the local population. This approach ensured effective information flow between the Company and the catchment communities and provided the platform for building strong and collaborative working relationships with project stakeholders.

AGM has over time followed a well-defined communications plan with key discussion items as follows:

20.3.3 Governmental Stakeholders

On the governmental and regulatory side, regular engagement sessions were held with the various regulators and government departments to provide the required updates on progress at the AGM.

To this end, the following governmental stakeholders have been kept fully informed, their opinions and inputs sought and are actively updated on the AGM with formal notifications, submissions and applications made as required. These were the:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The relevant consents, regulatory permits and approvals continue to be successfully renewed and updated as required.

20.4 Environmental and Social Management

20.4.1 Environmental Management System

Though the AGM is yet to go through ISO14001 Certification, its environmental management system (EMS) is aligned to the standard which follows the "Plan, Do, Check, and Act" (PDCA) methodology.

The AGM's EMP outlines anticipated mitigation measures to be developed to monitor environmental impacts associated with the Project. It addresses the following aspects:

Environmental and social impacts associated with the establishment and operation of the Obotan Mine was assessed in the 2013 ESIA and subsequent addendums to the ESIA.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.5 Environmental and Social Mitigation

AGM is currently implementing the preventative approach to environmental management with the primary objective of limiting negative environmental impacts from the operational activities, whilst maximising positive benefits. Where possible, AGM seeks to minimize such negative impacts through appropriate mitigation measures. This approach fulfils the aspirations of the corporate policy on the environment, environmental performance management systems, and various impact-specific environmental action plans.

Waste rock from mining operations is placed in areas identified as suitable for the establishment of WRD facilities and are located in close proximity to the resource areas.

Tailings material from the plant is deposited on the expanded TSF. Cyanide in the CIL tailings is detoxified using a three-phase hybrid cyanide destruction process. Weak acid dissociable cyanide concentration is reduced in a single tank by means of sodium metabisulfite and air. The SO2/air process is used for cyanide destruction prior to tailings deposition in the TSF.

The management of potentially acid generating material is implemented to limit the effect on the receiving environment.

A surface water management regime consists of a clean water diversion system to control the uncontaminated run-off from the higher lying natural environment, and a dirty storm water system to capture the contaminated storm water from plant, operational and processing areas.

Water in the dirty water system is to be collected for reuse or routed through sediment control structures before being discharged into the environment. To this end, water is only discharged into the environment when it meets the EPA's effluent guidelines for mining.

The TSF and associated expansion has the following design characteristics associated with storm water management:

Given the expected geochemical characteristics of fresh rock from Esaase, a new water treatment plant is under construction at the process plant to the treat process water. A similar plant has already been built at Esaase to treat water from the pits following which the solution is allowed to settle and the treated water decanted and, finally, released to the environment.

Appropriate drainage control measures to minimize soil erosion will be put in place during preparation of each site.

20.6 Environmental and Social Monitoring

Monitoring information is assessed against the Ghana EPA guidelines (January 2001) and in alignment with international best practice guidelines for the mining industry, including:

The Government of Ghana and EPA's Environmental Performance Rating and Disclosure Methodology for Mining Companies (AKOBEN Programme).

In line with regulatory requirements, the AGM has been monitoring and reporting all environmental incidents that may occur on or offsite as a result of its operations.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.6.1 Surface and Groundwater

AGM maintains an extensive programme for the regular monitoring of surface and groundwater quality. Compliance sampling is conducted monthly, and results are analysed externally by an accredited laboratory to determine compliance with regulatory requirements. Control and reference sampling are typically conducted on a quarterly basis. As per International Cyanide Management Code (ICMC) requirements, weekly sampling is conducted at cyanide facility areas for free cyanide, WAD-cyanide, and total cyanide levels. Pit water quality is also monitored monthly with additional monitoring conducted prior to any necessary discharges.

Multiple locations within the TSF surrounds are monitored daily to enable detection of any potential discharges. Supernatant and seepage water from the TSF are monitored monthly. Several piezometers have been installed on the embankments of the TSF to monitor pore pressure levels within the embankments. The piezometers are typically monitored monthly to enable observation of both seasonal and operational changes in water levels.

Surface water monitoring points required during construction, operation, and closure for the Esaase Project include downstream of pit discharge points, waste rock dumps and stockpiles as well as locations around any other facility such as workshops and fuel bays.

Potable water sources in all the communities monitored during the baseline groundwater are monitored monthly.

20.6.2 Dust and Noise

A Dust Management Plan (DMP) has been developed, and is being implemented, to provide a coordinated approach to dust impact mitigation. An integral part of the dust management program is a monitoring program that has been instituted in the surrounding communities. Stations are monitored fortnightly, and the results submitted to the EPA. Additionally, the monitoring stations also assess levels of nitrogen oxides and sulphur oxides (NOx and SOx).

Noise monitoring is similarly undertaken across several affected communities and is compared to the day and night-time guidelines.

20.6.3 Aquatic Environment

Appropriate drainage control measures to minimize soil erosion are in place by the AGM. These measures include:

The AGM has established Water and Sanitation Committees (WATSAN) in communities where it has provided boreholes and, in addition to regular monitoring, the company provides the needed oversight and support to ensure these are in good working condition and also regularly maintained.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.6.4 Ecological Environment

Although post-mining land uses are likely to be agriculturally oriented, a terrestrial fauna survey will be undertaken during the closure phase to assess habitat regeneration as well as compliance with AGM's Reclamation and Closure Plans.

In the interim, specific actions being pursued by the AGM include:

These actions have created favourable conditions for return of fauna to the reclaimed areas.

20.6.5 Acid Rock Drainage Monitoring

Sampling and assessment of rock types/lithologies from the operations is carried out routinely to understand acid base accounting, rock mineralogy and potential for ARD development. Routine ARD monitoring is conducted in-house with additional analyses conducted by external laboratories, as required.

20.6.6 Tailing Storage Facility

The monitoring program for the TSF is described in Section 20.9.

Additionally, an Independent Tailings Review Panel (ITRP) was established to provide advisory services to the ongoing monitoring, maintenance, and construction of the TSF. The ITRP comprises of 4 international experts with experience in geology, geotechnical, geochemistry and hydrology. The ITRP supports the AGM's efforts to apply evolving international best practices and standards to ensure increased oversight, tracking, monitoring, capacity building and support for site level personnel.

The ITRP closely works with the Engineer-of-Record, AGM and Galiano senior management and the Board Committee on Sustainability as well as our JV partner. Semi-annual meetings are held to discuss a multitude of issues around water & geochemistry, capacity and containment, emergency preparedness, construction standards & scheduling, monitoring technology, closure practices and alignment to best practices.

20.7 Socio-Economic Aspects

AGM has formed Community Consultative Committees (CCC) which comprise of representatives of the mine, the District Assemblies (local government), traditional authorities and various identifiable groups. The CCC presents an important platform for communicating with stakeholder, providing updates on the mine's activities and projects, receiving feedback from community stakeholders and addressing any stakeholder concerns that there may be.

The company has further established the Asanko Development Foundation into which a contribution of $2/oz is made for every ounce of gold sold. The accrued amount is to be used for community-driven development projects.

20.8 Closure and Reclamation

AGM's reclamation objective is to ensure that the site is left in a condition that is safe and stable where long-term environmental impacts are minimized and any future liability to the community and future land use restrictions are minimized.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The final post-mining land use will be determined in consultation with the EPA, other Ghanaian government institutions, stakeholders, and local communities. Natural soil covers and vegetation will as far as possible be re-established over the disturbed areas.

Financial provision for reclamation and closure are made in accordance with the requirements of the Reclamation Security Agreement (RSA) that has been entered into between the mine and the EPA. The RSA sets out criteria for Primary Completion, Land Use Completion and Final Completion. Final completion is achieved when an area continues to meet the completion criteria with no monitoring or maintenance for three seasonal cycles.

As various facilities reach the end of their useful life, AGGL will begin reclamation activities in tandem with ongoing mining operations. For instance, concurrent reclamation at the Nkran Waste Rock Dump which started in 2019 and has been extended to cover additional 6.84 ha bringing the total area under reclamation to 12.93 ha. Native timber species and food crops were planted to create a valuable revegetated land that resembles a natural forest (Figure 20-4).

Figure 20-4 Reclamation of Native Timber Species and Food Crops

The AGM re-assess the closure and reclamation liability on an annual basis as changes occur. Changes include examples such as increase in land disturbance, reclamation work complete in tandem with ongoing operations, or change in regulatory/remediation requirements.

As at December 31, 2021 the asset retirement provision recognized under IFRS on the financial statements of the AGM was $81.0M USD. There is no significant difference through to the effective date of this report.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.9 Tailings Storage Facility Design and Construction

The TSF consists of multi-zoned downstream raised embankments. At present, Stage 5 of the TSF is operational, and Stage 6 construction has recently been completed and is pending commissioning. Stage 6 will provide a total capacity of 29.2 Mt. The latest design completed in 2021 considers a limit of Stage 12, with a total footprint area of 375 ha (the basin area is approximately 318 ha). The TSF will generally be expanded vertically beyond the Stage 6 footprint into a ring dike configuration, and a single storage basin or cell formed such that reduced rate of rise plus construction efficiency are realized during future expansions to the facility. Tailing's deposition shall be undertaken, using subaerial methods such that a near centralized pond develops farther from the impounding walls. Each development of the facility is capable of safely accommodating tailings from mill operations and envisaged rainstorm events, applicable to the facility.

Table 20-1 Tailings Storage Facility Design Summary

Parameter

Unit

Value

Total Capacity

Mt

64.0

LOM Design Embankment Crest Limit

M

203.0

Height of LOM Critical Embankment

M

53.0

Total Volume of Embankments

Mm3

11.1

Total Crest Length of Embankments

m

7,487.0

Total Footprint of Embankments (Base Area)

Ha

174.3

TSF Basin Plan Area

Ha

317.7

The TSF embankments are designed with 2.5H:1V upstream slopes to support stability and HDPE geomembrane installation. Downstream slopes of embankments are to vary from 2H:1V to 3.0H:1V during the raise constructions of the TSF, with the slope becoming gentle or flatter as the development approaches the LOM crest. A minimum 25 m wide buttress is provided for the highest embankment (West Embankment) during each stage raise. Each stage embankment has a minimum 12 m crest width to accommodate envisioned construction machinery. The adopted crest width, downstream and upstream slopes as well as the buttresses, contributes to the overall stability of the storage facility by supporting mobilization of safety factors that satisfies project country regulatory requirements and adopted design guideline(s) recommendations.

During each expansion to the TSF, vegetation within the footprint will be cleared, grubbed and de-stumped as part of foundation and subgrade preparations for fill construction. Topsoil and unsuitable materials (saturated, weak and vegetation laden soils) within the TSF footprint shall be stripped or removed such that the expanded embankments are constructed on competent ground. Unsuitable materials and topsoil shall be stockpiled in designate locations within the TSF proximity to support facility closure and rehabilitation efforts.

The embankments are provided with cut-off walls, constructed from plastic clays/silts along the upstream toes into competent low permeability in-situ foundation materials, which mitigates seepage of in-store slurry water beneath the dam such that the environment external to the TSF is not adversely impacted. TSF areas forming part of the containment basin are constructed with a minimum 200 mm thick compacted soil (clay/silt) liner (CSL), from either reworked suitable in-situ or imported materials. Upstream fills of embankments comprise a minimum 6 m wide low permeable zone, constructed from plastic clays and/or silts (Zone A). 1.5 mm thick smooth HDPE geomembrane are installed within the basin to form a continuous composite hydraulic barrier with the CSL and embankment low permeable fills (Zone A) during each expansion of the facility. The cut-off walls, CSL, embankment upstream low permeable fills, and HDPE geomembrane provides hydraulic containment for in-store tailings water mitigating seepage releases and safeguarding the external environment.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Supernatant water recovery from the TSF to process circuit shall be via two Decant Towers, to be supported by a floating barge on as needed basis. Two sufficiently sized submersible pumps would be utilized for Decant Tower operations - a pump shall be installed in each tower. Decant Towers shall be extended over the LOM to support water recovery to process operations such that a small pond is maintained in the TSF within operational limits or requirements, to the extent practical. The floating barge shall be maintained, during each expansion of the facility, for backup operations.

Gravity drained groundwater and under-drainage systems, comprising primarily of branch and collector drains, installed within the TSF basin shall be utilized throughout the facility operations to the LOM end. The groundwater system (also referred to as subterrain or sub-liner water collection system) act to mitigate uplift pressure risks to the basin hydraulic barrier; and provides a means for evaluating the performance of the hydraulic barrier system (CSL, embankment Zone A and HDPE geomembrane) against seepage of slurry water. The under-drainage system (also referred to as over-liner drainage system) shall: promote consolidation of in-store tailings solids; reduce seepage; aid improved in-store densities and stability. A seepage collection and confinement channel is to be maintained downstream of the West Embankment, to allow collection of seepage (where any) and rain precipitates into a sump for monitoring. Water reporting to the sump shall be returned to the TSF surface as part of measures to mitigate release of tailings water into the external environment.

The design incorporates an emergency spillway during each expansion to the TSF. This shall be available at all times during operations for each expansion, to end of mine life, to aid controlled safe evacuation of rainstorms in excess of the facility's design storage capacity and mitigate overtopping breach risks (however unlikely).

Figure 20-5 Tailings Storage Facility Stage 12 Layout
Source: Knight Piésold, 2021


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.9.1 Monitoring

A monitoring program for the TSF is currently in place to observe for potential challenges which may arise during operations. This program will continue to be reviewed, evaluated, and updated as information become available and the facility performance is understood.

Additional groundwater monitoring stations will be installed downstream of the TSF, as determined necessary, to support routine observation of water quality and early detection of changes in baseline parameters (both during operations and after decommissioning) such that potential risks are mitigated proactively.

Vibrating wire piezometers and open-end standpipe piezometers will be installed in the TSF embankments, as determined appropriate and in conformance with existing regulations (L.I 2182), to monitor pore water pressures within the embankments and confirm that facility performance is consistent with design intent with regards to impoundments stability. The piezometers will be monitored at regular intervals and the observations noted and communicated to the Design Engineer.

Survey pins and/or prisms will be installed at regular intervals along the embankment crests per local regulatory requirements and to international best practice guidelines to monitor potential deformations in the impounding walls, as part of overall dam performance and safety observations, that would aid any potential or identified distress remediation in a timely manner.

A number of instruments (shape accelerometer arrays and inclinometers), that aid continued observation of the impoundments' performance relative to deformation, have been incorporated in recent expansion to the TSF. These automated instruments will support real-time data collection, transmission via wireless communication system and graphical reporting such that deformation related distresses to the TSF impounding walls are identified timely, and remedial measures implemented such that the dam is continuously operated under practically safe conditions.

The adopted monitoring instruments will be reviewed, as appropriate, during expansions to the TSF. Alternative technologies may be considered, adopted and incorporated into the TSF monitoring/surveillance system as may be determined applicable.

The TSF will undergo operational audits and dam safety inspection or review by a suitably qualified Geotechnical Engineer, as part of continuous monitoring efforts relative to safe facility performance. The audits will observe that the facility is operating within design intent and in an efficient manner or otherwise. Operational audits and dam safety inspection or review intervals shall be adopted and reviewed as may apply to the TSF.

20.9.2 Water Management Strategy

Water management is a fundamental consideration for the safe design and operation of the TSF in support of process plant operations. The design approach adopted for the expansions to the TSF, relative to water management and associated risk mitigation, considers that each stage raise or expansion has sufficient: capacity to accommodate anticipated rainstorm events and rainfall sequence commensurate with the dam classification per Ghanaian regulatory requirements (L.I 2182) and best practice guidelines provided by ANCOLD. The design objective is to either meet or exceed, to the extent practical, those requirements and/or recommendations; and freeboard above operating pond level and anticipated applicable design rainstorm event, such that risks of in-store materials release to the external environment are mitigated.

A key water management strategy is to recover the maximum possible slurry liquor and rainwater from the TSF for recycling to process operations. Shortfalls will be supplemented from raw water sources available on site, as may be determined essential.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

To efficiently manage TSF and process water supply/demands over the updated LOM, a water balance model has been developed to aid estimation of: net inflow and outflow of slurry water from the TSF, supernatant pond volumes under design average and dry rainfall sequence, supernatant pond volumes (following design rainfall events and sequences), and make-up water requirements during design average and dry rainfall sequences.

Key considerations for the water balance model developed include: process water demand; tailings percent solids or tailings solids content (current and projected); LOM mining schedule and mill feed blends; ore water content; settling and consolidation properties of tailings from ore bodies to be included in mill operations; TSF basin groundwater or subterrain water inflow/pump rates; run-off water from direct and surrounding catchments to the process and TSF circuit; current and alternative sources of process make-up water; Open Pit development schedules and post mining plans; and climatic data (including rainfall, evaporation etc).

Generally, the TSF maintains water sufficient to support process operations such that a minimal supernatant pond results under average climate conditions with sufficient freeboard. Under dry climatic conditions, additional water will be supplied from available sources external to the TSF to support process operations.

20.9.3 Closure and Rehabilitation

The rehabilitation and closure of the TSF will include activities that take place concurrently with its development and operation, as well as those associated with its final decommissioning and closure. At closure, the TSF will remain a permanent feature on the landscape immediately adjacent to the extensive Nkran waste rock dump.

Tailings will be drained of water during the operational phase of the facility via the under-drainage system, installed within the dam, to reduce the phreatic surface and improve stability of in-store solids to support closure cap or cover construction. The under-drainage system is expected to continue to operate for a number of years, after completion of capping and native vegetation used for the rehabilitation become established, until such time when interstitial water has been drained (to the extent practical from the tailings mass) such that a stable landform is realized.

The closure cover shall be constructed from suitable local mine waste rocks, oxides or saprolites stripped to various stockpiles during open pit developments, plastic clays/silts, drained alluvial soils (removed from the TSF basin and embankment footprints) and stockpiles of topsoil at the mine.

20.9.4 Geotechnical Investigation

Several geotechnical investigations have been completed in support of the TSF design. These investigations included: desktop review of site knowledge, obtained from mine exploratory activities and other constructions; regional geological/geotechnical information review; existing site-specific geotechnical investigation reports reviews; site reconnaissance; supplementary geotechnical explorations with in-situ testing and sampling; and geotechnical laboratory testing of recovered materials. The geotechnical investigations for the existing and planned TSF expansions were conducted to assess:

Key observations of the geotechnical investigations conducted, with respect to the existing and planned TSF expansions, include:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Geotechnical investigations conducted in the TSF vicinity, including observations of the most recent supplementary ground explorations completed in quarter 3 of 2021 (in support of the planned Stage 7 raise of the facility), provides information sufficient to support and guide the facility design/construction. Additional geotechnical investigations shall be conducted to support future expansions of the TSF as determined necessary and practical.

20.9.5 Tailings Physical Characteristics

Tailings physical testing of representative oxides and primary ore from the Nkran and Esaase orebodies was undertaken in 2012 and 2015.

Supernatant water release ranging from approximately 42% to 53% of slurry liquor is envisaged per the observations of the tests conducted. Tailings water release to the under-drainage system may range from approximately 5% to 20%, considering the: design/operations of existing drainage system; basin treatment; and deposited tailings thickness over the collection system. Tailings water release to the under-drainage system is envisaged to reduce during the later stages of the facility development due to consolidation and increased thickness of deposited tailings solids.

Where the TSF is efficiently operated, long term in-store densities of deposited slurry solids ranging from 1.40 t/m³ to 1.50 t/m³ may be realized. It is envisioned that minimum achievable in-store slurry solids density, considering ore blends and milling schedules for the LOM, shall be approximately 1.30 t/m³.

The physical properties of the tailings are such that they would support recovery of large volumes of slurry water for recycling to process operations, reducing in-store pond volumes and demand for supply external to the TSF over the LOM; such that dam safety as well as downstream environmental risks are mitigated. 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

20.9.6 Tailings Geochemical Characteristics

Geochemistry testing of representative samples (of oxide and primary tailings) for the Nkran orebody was conducted by Genalysis in 2012. Both oxide and primary Nkran tailings samples were classified as non-acid forming or non-acid generating. The samples had a moderate number of elemental enrichments, although several metals of interest were found to be present. Arsenic and mercury classed as highly enriched in the samples tested. Boron was found to be highly enriched in the oxide samples. 

Geochemical testing of three samples of tailings from the Esaase orebody was conducted by Environmental Geochemistry International ("EGi"). The tests conducted by EGi included both static testing and column leaching. The results of the static acid-base accounting testing indicate that the samples are all non-acid forming and do not present related environmental risks. The only element found to be significantly enriched was arsenic. The column leaching indicates that the leachate remained alkaline with a low salinity, and that the majority of highly soluble arsenic was removed in the processing stage at high pH. Arsenic leaching was therefore limited beyond the processing stage.

Due to observed elemental enrichment in the tailings evaluated, facility closure shall be developed to consider a cover or capping system to mitigate risks of tailings and constituent metals release into the external environment post LOM.

Based on the environmental control measures (i.e., CSL and/or HDPE geomembrane use, cut-off trenches or walls and under-drainage system) included in the facility design/construction, anticipated seepage should not adversely impact surface water and/or groundwater aquifers. However, as a precaution and further commitment to wildlife protection, the TSF may be fenced to mitigate access by as many terrestrial animals as practical.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

21 CAPITAL AND OPERATING COSTS

Not applicable at the current stage of the Project.

 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

22 ECONOMIC ANALYSIS

Not applicable at the current stage of the Project.

 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

23 ADJACENT PROPERTIES

Properties adjacent to the Asanko Gold AGM area and tenements are shown below in Figure 23-1. The AGM properties are shown in bright red and are named. The property listing is shown in Table 23-1. These properties are all located within the Kumasi basin and share similar underlying deformed siliciclastic metasediments as the primary rock type, with a range of syn- to late tectonic granite intrusives mainly to the east of the AGM tenements. None of these adjacent properties host mineral resources that are in alignment with a Reporting Code such as JORC, SAMREC or CIM.

Information on adjacent properties are based on information publicly disclosed. The Qualified Person has been unable to verify the information regarding adjacent properties. The information regarding adjacent properties is not necessarily indicative of the mineralization on the Asanko Gold Mine.

Table 23-1 Adjacent Property Listing

Tenement /PL Number

Tenement Owner

137

Tropical Minerals Co. Ltd

91

Moseaso Co. Ltd

155

Joam Enterprise Ltd

169

Rock and Rivers

234

Triple Key Co. Ltd

150

Hawanah Natural Resources

138

U & N Ltd

145

Westminister

257

Star Gold Ltd



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 23-1 AGM Tenements and Adjacent Properties
Source: Asanko Gold Mine, 2021


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

24 OTHER RELEVANT INFORMTION

No other relevant information.

 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

25 INTERPRETATION AND CONCLUSIONS

25.1 Risks

The following risks have been identified:

25.2 Opportunities

The Asanko Gold Mine will prioritize further work to advance on the understanding of Esaase metallurgy and geometallurgy to support a new optimized life of mine plan and re-instate Mineral Reserves. This will be facilitated by the fact that the Asanko Gold Mine is an established operation with a processing plant, site infrastructure, permits, and organizational capability already in place to readily support a future LOM.

Additional work programs are taking place concurrently to optimize capital and operating costs, ensure best practices in relation to the size and scope of the operations, infill drilling to de-risk investments, and drill mid- and long-term exploration prospects to accelerate addition of new Mineral Resources and provide more flexibility in mine planning.

Other opportunities identified include:


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

25.3 Geological Setting and Mineralization and Deposit Type

The understanding of the regional, local and property geology within the Asanko mineral concessions has been developed through many years of exploration and mining and is sufficient to support interpretation of the relevant geological controls, the length, width, depth and continuity of the mineralization, and type, character, and distribution of the mineralization hosted in these structurally controlled orogenic gold deposits.

However, structural controls and lithological controls on mineralization associated with orogenic gold deposits are particularly complex and often change with more detailed information, and exposure of the deposit during mining.

25.4 Exploration, Drilling, Sample Preparation and Analysis, and Security

The exploration programs completed to date are appropriate for the structurally controlled orogenic gold deposits found within the Asanko mineral concessions. Core and reverse circulation drilling, logging, sampling, sample preparation, and laboratory analysis methods used since 2014 have followed industry standards for structurally controlled orogenic gold exploration. Sample security since 2014 was in accordance with exploration practices and industry accepted standards. The limited availability of documentation supporting the drilling, logging, sampling, sample preparation, and laboratory analysis methods before 2014 is mitigated by the verification work completed and the quality and density of more recent data. No material factors were identified with the data collected from the drill programs that might affect the reliability or confidence in the exploration information. The drill hole spacing, the lithological, collar and down-hole survey, and density data collected during the exploration programs and the sample preparation and assay results allow for preparation of a reasonable estimate of the geometries, tonnage, and grade continuity of the mineralization.

25.5 Mineral Resources

The Mineral Resources are reported in accordance with the CIM Definition Standards for Mineral Resources & Mineral Reserves, adopted by CIM Council May 10, 2014 and assume open pit mining methods, milling and CIL gold processing methods. All reported resource estimates are constrained within conceptual open pits. Factors that may affect the Mineral Resource estimates include: changes to commodity price assumptions; changes to metallurgical recovery assumptions; changes to interpretations of geological continuity due to changes in geometallurgical, lithological, weathering or structural interpretations; changes to assigned density values in the estimation domains; changes to operating costs; changes to geotechnical characteristics; and changes to environmental, permitting and social license assumptions.

25.6 Mineral Reserves

At the time of the effective date of this Report, there remains an uncertainty in the variability of metallurgical recovery of gold from the Esaase deposit. Although all metallurgical testwork to date indicate predictable trends in the recovery of gold from the Esaase deposit, recent mill feed consisting of primarily Esaase material has demonstrated lower recovery. As a result, the Company has concluded that there is insufficient confidence in the understanding of the Esaase metallurgical variability to estimate Mineral Reserves.

Given the uncertainty of metallurgical performance on the Esaase material, Galiano Gold has decided not to state Mineral Reserves for all deposits. Any plant feed in the short term will have significant Esaase material present and overall recovery would therefore be difficult to predict.

Only the Esaase material is believed to be performing adverse to expectations. Recovery of gold from Nkran and all other satellite deposits remain of sufficient confidence, but will be subject to additional metallurgical testwork. Upon conclusion of the planned metallurgical testwork, Galiano Gold will prepare an updated technical report supporting an optimized life of mine plan, based on Mineral Reserves. 


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

25.7 Metallurgical Testing and Recoveries

The 2021 testing for Esaase material (ALS report A22281) returned recovery results for the bulk composites that align with those from the 2018/19 Esaase testwork programs. As such, no change has been made to recovery estimates as per the Asanko Gold NI 43-101 Technical Report (2020) for the purpose of constraining a Mineral Resource estimate.

The recovery estimates are of sufficient confidence to determine reasonable prospect for eventual economic extraction; however, in light of recent plant performance of the Esaase material, further understanding of the Esaase metallurgical variability is required to have sufficient confidence to declare Mineral Reserves.

Gold recovery for Nkran and the satellite deposits is estimated to be 94% based on previous operational performance. Additional metallurgical testwork undertaken in 2021 for Nkran, Abore, and Miradani North material support that the assumed recoveries are valid.

25.8 Processing

The existing Asanko Gold Mine process plant located at Obotan is capable of processing 5.8 Mtpa of mill feed. The plant comprises of primary jaw crushing, SAG and ball mill, gravity concentration and ILR, pre-leach thickening, CIL, elution and gold room, and cyanide detoxification.

25.9 Infrastructure

The Obotan plant commenced production in early 2016. The plant was erected close to the Nkran deposit and in proximity to several satellite deposits.

Major site infrastructure consists of an office complex, metallurgical facility, Tailings Storage Facility, senior and junior accommodation and mess facilities, workshops, power distribution facility, a core storage facility, potable and operational water supplies, waste rock dumps, an upgraded dry weather air strip and a haul road from Esaase pit to Nkran pit.

The Tailings Storage Facility is located near the process plant and consists of multi-zoned downstream raised perimeter embankments.

25.10 Market Studies and Contracts

AGM has an off-take agreement to sell 100% of the future gold production up to a maximum of 2.2 Moz to the original project lender, Exp T2 Ltd ("Red Kite"). Arrangements for sale of production after this agreement is satisfied will be reviewed as required.

As of December 31, 2021, the AGM has delivered 1,299,256 ounces to Red Kite under the offtake agreement.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

26 RECOMMENDATIONS

26.1 Metallurgy

To better understand the elevated tailings grade recently observed at the process plant, the following work is either in progress or is proposed:

The additional metallurgical drilling, sampling and testwork are estimated to cost between $3.0M to $5.0M USD.

26.2 Geology and Mineral Resources


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

The infill drilling, core relogging, and geological mapping programs are estimated to cost between $10M to $15M USD. Underground potential drilling for Nkran and Miradani North is not included in this range and is further described in Section 26.3.5.

26.3 Exploration

26.3.1 Geological Mapping

In addition to the known mineralized belt, AGM owns a significant land position west of Asanko known as the Sky Gold tenements. Little work has been completed on these concessions, yet AGM pays a fee for their maintenance. It is recommended that a small team of geologists conduct reconnaissance geological mapping (and rock chip sampling) on these areas in order to form a view on their prospectivity and value.

The geological mapping of the Sky Gold tenements is estimated to cost approximately $0.5M USD.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 26-1 Location of Sky Gold Tenements West of the Esaase Deposit, with Geology Interpreted From Regional Geophysics

26.3.2 Geophysics

Follow up on the 2020 gradient array geophysics at Esaase by conducting high resolution (100 m line spacing) gradient array surveys along prospective structural corridors. This was originally to be completed in 2020/2021 but logistical challenges related to the global pandemic prevented implementation. Areas of focus should include but should not be restricted to areas along strike from the Jeni River, along strike extensions to Esaase, Nkran, Kaniago, Miradani and Midras deposits and prospects (see Figure 26-2 below).

In addition, deep IP should be considered at deposits such as Abore to explore for chargeability features that may indicate extensions to mineralization at depth and assist in more efficient drill targeting.

The geophysics program is estimated to cost approximately $0.5M USD.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 26-2 Location of Recommended Areas for Gradient Array Survey


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

26.3.3 Geochemistry

Ore mineragraphy completed on Esaase ore samples (Di Prisco, 2011) supports a spatial if not temporal relationship between gold and arsenopyrite (and to a far lesser extent chalcopyrite and galena). Visual observation of drill core taken together with assay data suggests this arsenopyrite - gold relationship is common in deposits explored by AGM in the Asankrangwa belt. Multi-element analysis of a statistically meaningful amount of historical core/pulp to build on AGM's understanding of the spatial arsenic-gold relationship (and thus use arsenic as a footprint for gold) would be prohibitively expensive. A cost effective and reliable method of collecting arsenic (as a proxy for arsenopyrite) data is pXRF analysis. It is recommended that AGM purchase an additional Olympus pXRF instrument and undertake collection of pXRF data on all drill holes of selected sections on several of its deposits. Building 3D models of arsenic distribution may well provide useful vectors to additional mineralization.

In addition to the above, the collection of pXRF data from soil and trench sample could provide a quick and cost-effective filter for higher priority areas the explore.

The geochemistry program is estimated to cost approximately $0.5M USD.

26.3.4 Spectral

Gold mineralization at the AGM deposits has a recognizable sericite-carbonate signature, well noted in logging, paragenetic (Davis, 2016) and petrological studies (Nude, 2011, and Di Prisco, 2011). However, the current dataset cannot be used to construct a reliable alternation model for these deposits due to historical inconsistent logging. A solution to this would be to dedicate a geologist to the collection of spectral data using the companies currently inactive spectrometer. This data could be submitted to a consultancy for interpretation and use in better understanding hydrothermal alteration of the AGM deposits.

The spectral program is estimated to cost approximately $0.5M USD.

26.3.5 Drilling

26.3.5.1 Nkran Deeps

Underground mining scenarios have long been considered at Nkran. Resolute Mining included a modest underground resource (Spiers, 2010), and AGM have reviewed the idea of underground mining at Nkran at a conceptual level. Additional deep drilling is recommended to explore for significant down dip and down plunge mineralization at Nkran.

In the event of a successful conclusion of Phase 1 drilling, Phase 2 drilling campaign will be recommended to further quantify potential for Nkran Deeps.

The Phase 1 Nkran Deeps directional drilling program is estimated to cost between $2.0M to $3.0M USD.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

Figure 26-3 Longitudinal Section Through the Nkran Deposit Showing Multiple Shoot Trends That Hold Potential for Additional Resources

Figure 26-4 Cross-section Through the Nkran Deposit With Possible Deep Drilling Hole Traces


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

26.3.5.2 Miradani Deeps

The Miradani North deposit shows many similarities to Nkran, including a tonalite intrusive association and the existence of high-grade shoots. A well-defined steeply northeast plunging shoot is evident in longitudinal section through the deposit, as seen in Figure 26-5 below. This high grade +80 gm.m shoot remains open at depth and further drilling should be considered to explore for extensions and repetitions to this high grade. In the event of a successful conclusion of Phase 1 drilling, Phase 2 drilling campaign will be recommended to further quantify potential for Miradani Deeps.

The Phase 1 Miradani Deeps directional drilling program is estimated to cost between $2.0M to $3.0 USD.

Figure 26-5 Longitudinal Section Through the Miradani North Deposit

26.3.5.3 Other Exploration

Considerable potential exists for the discovery of additional gold resources on the AGM licenses, near existing operations as well as regionally.

A number of poorly tested prospective trends recognized during earlier prospectivity analysis were followed up by AGM with drilling, mapping and sampling, and in some cases trenching in 2021. These include the Gyagatreso-Kaniago-Abore trend, the Greater Midras-Nkran-Takorase trend, the Datano-Fawotrikye trend and the Abore-Jeni River-Esaase trend. These areas were highlighted due a combination of coincident structural and soil geochemical anomalies, and in some cases topographic highs and may relate to zones of veining and silicification associated with mineralized systems. Follow-up exploration is recommended for these prospects.

A budget of approximately $5.0M USD is planned in 2022 for greenfield generative exploration, and will be re-evaluated on an annual basis.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

26.4 Operating Cost Optimization

The following operating cost optimization opportunities have been identified to be evaluated in further detail:

This work program is estimated to cost approximately $0.5M USD and is expected to take place in 2022.


 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022

27 REFERENCES

Primary documents associated with this Technical Report, by discipline, are referenced below.

Geology

Asanko Gold, 2020

Grade Control Procedures_2020

Agyei-Duodu, J., Loh, G. K., Boamah, K. O., Baba, M., Hirdes, W., Toloczyki, M., & Davis, D. W., 2009

Geological Survey Department of Ghana (GSD) Report. Geological Map of Ghana 1:1,000,000, Accra Ghana.

Allibone, A., McCuaig, C., Harris, D., Etheridge, M.A., Munroe, S., and Byrne, D., 2002

Structural controls on gold mineralization at the Ashanti gold deposit, Obuasi, Ghana: Society of Economic Geologists Special Publication 9, p. 65-93.

Allibone, A., Hayden, P., Cameron, G., and Duku, F., 2004

Paleoproterozoic gold deposits hosted by albite- and carbonate-altered tonalite in the Chirano district, Ghana, West Africa: Economic Geology, v. 99, p. 479-497.

Asiedu, D.K., Asamoah Sakayi, P., Banoeng Yakubo, B., Dampare, S.B., Osae, S., Manu, J., and Nyarko, B.J.B., 2004

Geochemistry of Paleoproterozoic metasedimentary rocks from the Birim diamondiferous field, southern Ghana: Implications for provenance and crustal evolution at the Archean-Proterozoic boundary. Geochemical Journal vol 38, pp. 215-228

Baratoux, L., Metelka, V., Naba, S., Jessell, M.W., Grégoire, M., and Ganne, J., 2011

Juvenile Paleoproterozoic crust evolution during the Eburnean orogeny (~2.2-2.0  Ga), western Burkina Faso: Precambrian Research, v. 191, p. 18-45.

Béziat, D., Dubois, M., Debat, P., Nikiéma, S., Salvi, S., and Tollon, F., 2008

Gold metallogeny in the Birimian craton of Burkina Faso (West Africa): Journal of African Earth Sciences, v. 50, p. 215-233.

CIM, 2010

CIM Definition Standards - For Mineral Resources and Mineral Reserves. Prepared by the CIM Standing Committee on Reserve Definitions. Adopted by CIM Council on 27 November 2010

CIM, 2014

CIM Definition Standards - For Mineral Resources and Mineral Reserves. Prepared by the CIM Standing Committee on Reserve Definitions. Adopted by CIM Council on 10 May 2014

CJM, 2014

Asanko Gold Mine, Ghana 43-101 Technical Report, 2014

CSA Global, 2019

CSA Global Report for the Asanko Gold NI 43-101 Technical Report (2019), prepared by various CSA Global employees, submitted February 2020.

Davis, D.W., Hirdes, W., Shaltegger, E., and Nunoo, 1994

U-Pb age constraints on deposition and provenance of Birimian and gold-bearing Tarkwaian sediments in Ghana, West Africa, Precambrian Research, v.67, pp.89-107

Davis, B., 2016

Nkran Geological History, internal Technical Report

de Kock, G.S., Théveniaut, H., Botha, P.M.W., and Gyapong, W., 2012

Timing the structural events in the Palaeoproterozoic Bolé-Nangodi belt terrane and adjacent Maluwe basin, West African craton, in central-west Ghana. Journal of African Earth Sciences, 65, 1-24

Di Prisco, G, 2011

Mineralogy Examination of the Esaase Gold Mineralization from Deep Zones, Part IV, Ashanti Region, Ghana

Dusci, M., & Davies, J., 2014

Geological Model Handover Reports for Abore Deposit, Asuadai Deposit and Dynamite Hill Deposit, and Nkran 3D Geological Model and Constraints on Mineralisation, over the 2014 period, for Asanko Gold Inc, on behalf of HMM Consulting.

Eisenlohr, B.N., 1989

The structural geology of Birimian and Tarkwaian rocks of southwest Ghana. Rep. Arch. BGR, 66pp



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Feybesse, J.L., Billa, M., Guerrot, C., Duguey, E., Lescuyer, J.L., Milesi, J.-P., and Bouchot, V., 2006

The Paleoproterozoic Ghanaian province: Geodynamic model and ore controls, including regional stress modeling: Precambrian Research, v. 149, p. 149-196

Goldfarb, R.J., André-Mayer, A., Jowitt, S.M. and Mudd, G.M., 2017

West Africa: The World's Premier Paleoproterozoic Gold Province, Economic Geology, v. 112, pp. 123-143

Gold Fields, 2020

Akwasiso_Model_ak_2008b_eng_Handover_Report_Sep20, September 2020

Gold Fields, 2020

Akwasiso_Model_ak_2008b_eng_Handover_Report_Sep20, September 2020

Adubiaso 2018 resource model handover note, 2018

Asuadai 2018 resource model handover note and report, 2018

Various communications

Gold Fields, 2018

Adubiaso 2018 resource model handover note, 2018

Gold Fields, 2018

Asuadai 2018 resource model handover note and report, 2018

Griffis, R. A., Baring, K., Agezo, F. L. and Akosah, F. K., 2002

Gold deposits of Ghana; pp 154-159 and 194 - 200

Hein, K.A.A., 2010

Succession of structural events in the Goren greenstone belt (Burkina Faso): Implications for West African tectonics: Journal of African Earth Sciences, v. 56, p. 83-94

Leube, A., Taylor, P., Moorbath, S., Hirdes, W., 1990

Early Proterozoic crustal evolution in the Birimian of Ghana: constraints from geochronology and isotope geochemistry; Precambrian Research, Volume 56, Issues 1-2, April 1992, Pages 97-111

Markwitz, V, Hein, K.A.A., and Miller, J., 2016

Compilation of West African mineral deposits: Spatial distribution and mineral endowment: Precambrian Research, v. 274, p. 61-81

Matsheka, I.R., and Hein, K.A.A., 2011

Character, morphology and origin of gold from the selected mines in the Yatela and Sadiola goldfield, Mali, West Africa. In: Poster Presentation to the WAXI Sponsors Meeting, Ouagadougou, Burkina Faso, 28 March to 1 April 2011.

McCuaig, C. and Williams, P., 2002

Review of structural controls on mineralisation and regional prospectivity of the Obotan project, Ghana, report compiled by SRK Consulting for Resolute-Amansie Limited, 53 pp

Metelka, V., Baratoux, L., Naba, S., and Jessel, M.W., 2011

A geophysically constrained litho-structural analysis of the Eburnean greenstone belts and associated granitoid domains, Burkina Faso, West Africa: Precambrian Research, v. 190, p. 48-69.

Milesi, J.P., Feybesse, J.L., Ledru, P., Dommanget, A., Ouedraogo, M.F., Marcoux, E., Prost, A., Vinchon, C., Sylvain, J.P., Johan, V., Teguey, M., Calvez, J.Y., and Lagny, P., 1989

Les minéralisations aurifères de l'Afrique de l'Ouest. Leurs relations avec l'évolution lithostructurale au Protérozoïque inférieur: Chronique de la recherche minière, v. 497, p. 3-98.

Milesi, J.P., Ledru, P., Feybesse, J.L., Dommanget, A. and Marcoux, E., 1992

Early Proterozoic Ore Deposits and Tectonics of the Birimian Orogenic Belt, West Africa. Precambrian Research, 58, 305-344, published 1992

Minxcon, 2012

Esaase NI 43-101 Technical Report, November 2012

Minnitt, R. 2020

An analysis of the Quality Assurance - Quality Control data from Obotan (2019-2020) and Esaase (2019-2020)

Nude, 2011

Petrographic report of Drill-core samples from the Nkran prospect, Obotan

Perrouty, S., Aillères, L., Jessell, M.W., Baratoux, L., Bourassa, Y., and Crawford, B., 2012

Revised Eburnean geodynamic evolution of the gold-rich southern Ashanti belt, Ghana, with new field and geophysical evidence of pre-Tarkwaian deformations: Precambrian Research, v. 204-205, p. 12-39.

Pratt, W., 2021

Geological Model and Metallurgy of the Esaase Gold Mine, Ghana. Technical Report.

Resolute-Adansi, 1995

Resolute Mining's Nkran Project Resource -Reserve Report



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


SEMS Exploration Services, 2013

Independent Technical Report for Aburi Mining Lease, Ashanti & Central Regions, Ghana

Siddorn, J and Lee, C, 2005

Structural Geology of the Ashanti II Concessions, Southwest Ghana, report compiled by SRK Consulting for PMI Ventures Ltd., 78 pp

Snowden, 2020 NI 43-101 Technical Report for the Asanko Gold Mine, Ghana (Amended and Restated) in June 2020

Spiers, R, 2010-2011 (H&S)

Technical Report: Obotan Mineral Resources Estimation and Ashanti II Gold Projects, Ghana, amended and restated Technical Report submitted by PMI Gold Corporation to the TSX, and lodged on SEDAR, 226 pp

SRK, 2011

Gleeson - available data presents status of geological studies following a site visit early in 2011

SRK, 2012

Obotan Gold Project - Mining Geotechnics Feasibility Study Summary Report, June 2012

SRK, 2019 to 2021

Various geotechnical reports and memorandums, including design parameters, over the 2019 to 2021 period, on the Asanko Gold Mine for Asanko Gold Inc.

Tshibubudze, T., Hein, K. A. A., Marquis, P., 2009

The Markoye Shear Zone in NE Burkina Faso, Journal of African Earth Sciences, 55, 245-256

Yao, Y., Murphy, P,J., Robb, L.J, 2001

Fluid Characteristics of Granitoid-Hosted Gold Deposits in the Birimian Terrane of Ghana: A Fluid Inclusion Microthermometric and Raman Spectroscopic Study, Economic Geology, Vol. 96, pp. 1611-1643

Processing

ALS, 2014

Metallurgical Testwork Conducted upon samples from the Esaase Gold Project for DRA Mineral Projects /Asanko Gold Inc, ALS Metallurgy, report No. A15168, March 2014

ALS, 2017

Metallurgical Testwork (Phase 2) Conducted upon samples from the Esaase & Obotan Gold Project for DRA Mineral Projects /Asanko Gold Inc, ALS Metallurgy, report No. A16645, July 2016 (Revised March 2017)

ALS, 2018

Metallurgical Testwork conducted upon Esaase Gold Ore Composites for Asanko Gold Ghana Limited, report No. A18754, December 2018

ALS, 2019

Metallurgical Testwork conducted upon Esaase Gold Ore Samples for Asanko Gold Ghana Limited, report No. A19208, January 2019

ALS, 2019

Metallurgical Testwork conducted upon Esaase Gold Ore Composites for Asanko Gold Limited/Gold Fields Limited, report No. A19437, September 2019

ALS, 2019

Metallurgical Testwork conducted upon Esaase Gold Ore Composites for Asanko Gold Limited, report A19681, September 2019

ALS, 2022

Metallurgical Testwork conducted upon Esaase Fresh Ore (Bulk Composites and Variability Samples) for Asanko Gold Limited, report No. A22281, January 2022

ALS, 2022

Metallurgical Testwork conducted upon Obotan Satellite Deposits (Nkran, Abore and Miradani) for Asanko Gold Limited, report No. A22441, January 2022

Amdel, 2011

Prefeasibility Testwork for the Esaase Gold Project for Keegan Resources - Part A: Comminution Testwork, August 2011

Amdel, 2011

Prefeasibility Testwork for the Esaase Gold Project for Keegan Resources - Part B: Flowsheet Development Testwork, August 2011

Amdel, 2012

Definitive Feasibility Testwork for the Esaase Gold Project for Keegan Resources, March 2012



 NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana
Effective Date: February 28, 2022


Amdel, 2013

Pre-Feasibility Testwork for the Esaase Gold Project for DRA Mineral Projects, Amdel Pty Ltd, Project No. 3486, including Addendum to Report, May 2013

DRA, 2013

Asanko Gold Project in Ghana - Pre-Feasibility Study

DRA, 2015

Asanko Gold Project Phase 2 Pre-feasibility Study, DRA 2015

DRA, 2017

AGM Expansion Project FS report JGHDP0221-RPT-007, DRA 2017

GRES, 2012

Obotan Gold Project Pre-feasibility Study, GRES, 11831 0184, February 2012

Lycopodium, 2009

Esaase Gold Project Report on Variability Testwork, March 2009

Resolute Amansie Limited, 2001

Adubiaso Open Pit - Final Report, February 2001

Resolute Amansie Limited, 2002

Abore Open Pit - Final Report, September 2002

Infrastructure

Knight Piésold Consulting, 2016

Tailings Storage Facility Feasibility Study Update December 2016

Knight Piésold Consulting, 2020

Tailings Storage Facility Pre-Feasibility Study (PFS) and NI43-101 Update March 2020

Knight Piésold Consulting, 2020

Asanko Gold TSF Dam Break Analyses to Stage 8 Raise / Asanko Gold Project TSF Stage 8 Dam Break and Consequence Assessment April 2020




(All dollar amounts are United States dollars unless otherwise stated)

GALIANO GOLD PROVIDES UPDATED MINERAL RESOURCE
ESTIMATE AND AN UPDATE ON MINING OPERATIONS

Vancouver, British Columbia, March 29, 2022 - Galiano Gold Inc. ("Galiano" or the "Company") (TSX, NYSE American: GAU) provides an updated Mineral Resource Estimate ("MRE") for the Asanko Gold Mine ("AGM"), located in Ghana, West Africa. The AGM is a 50:50 joint venture ("JV") with Gold Fields Ltd (JSE, NYSE: GFI) which is managed and operated by Galiano. A National Instrument 43-101 compliant technical report titled "NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana" with an effective date of February 28, 2022 (the "Technical Report"), detailing the updates to the AGM MRE was filed on SEDAR on March 29, 2022.

This news release should be read in conjunction with the updated NI 43-101 compliant technical titled "NI 43-101 Technical Report for the Asanko Gold Mine, Ashanti Region, Ghana," with an effective date of  February 28, 2022, which is available on the Company's website and filed on SEDAR.

Updated MRE for the Asanko Gold Mine (100% basis)

The AGM is reporting updated Measured and Indicated Mineral Resource Estimates of 66.4 million tonnes ("Mt") at 1.36 g/t for 2.9 million ounces ("Moz") gold contained (please see the table below for further information on the MRE, including a breakdown between Measured and Indicated Mineral Resources). At this time the Company is not in a position to declare Mineral Reserves on the AGM property as a result of current metallurgical uncertainty of the material mined from Esaase (please see the Company's press release dated February 25, 2022 for further information).  The Company expects to provide an update to its estimated Mineral Reserves following the conclusion of the metallurgical testwork currently underway at the AGM. Highlights to the updated Mineral Resource Estimate include:

The AGM continues to display a significant property-wide MRE of 2.9 million ounces of contained gold in Measured and Indicated Mineral Resources (please see the table below for further information on the MRE, including a breakdown between Measured and Indicated Mineral Resources), which now comprises six satellite deposits augmenting the cornerstone Nkran and Esaase deposits. Additions to the total MRE exceeded mined depletion but did not fully offset a decrease in overall gold grade in Measured and Indicated Mineral Resources (1.70 g/t to 1.36 g/t) and resultant contained metal in the Esaase Mineral Resource.


The changes at Esaase resulted primarily from updates to the geological models used in the Mineral Resource Estimate (see below). The remodeling work for Esaase yielded Measured and Indicated Mineral Resources totaling 22.6 Mt at a grade of 1.26 g/t, representing decreases of 25% in grade and 25% in tonnes, post depletion, from the previous estimate (please see the technical report titled "NI 43-101 Technical Report for the Asanko Gold Mine, Ghana (Amended and Restated)" published in June 2020 and filed on SEDAR for further information regarding the Company's prior MRE). The Esaase deposit remains the largest contributor to the total AGM Mineral Resources, accounting for approximately a third of its total tonnes and contained gold ounces.

"We are pleased to deliver a maiden Mineral Resource at Miradani North and an expansion of Mineral Resources at Nkran, Abore and Dynamite Hill. These results help reinforce the prospective nature of the AGM land package. The impact on the operations at the AGM resulting from the observed reductions in contained metal and lower grades at Esaase will be described in an updated technical report, which we anticipate publishing following the completion of the metallurgical testwork underway at Esaase," said Matt Badylak, President and CEO. "While this work continues, we will preserve the in-situ Mineral Resources at the AGM by temporarily deferring mining operations and transitioning to processing existing stockpiles.  During this time our efforts will focus on expanding our Mineral Resources through targeted exploration and working diligently to update Mineral Reserves and recommence mining operations as soon as practicable."

Asanko Gold Operations Update (100% basis)

While technical work to support a Mineral Reserve at the AGM is ongoing, mining will continue at Akwasiso Cut 3 and Esaase Cut 3 until their depletion (expected in Q2 2022). Following this, the process plant is expected to continue to operate at full capacity (5.8 Mtpa) processing a portion of the existing 9.5 Mt of stockpiles. The Company believes that temporarily transitioning to processing stockpiles will provide the opportunity to:

The AGM has a solid liquidity position ($66.0 million in cash, gold sales receivables and dore with zero debt at December 31, 2021) and at prevailing gold prices, it expects to continue to generate positive operating cash flows from the processing of stockpiles. The Company is concurrently exploring opportunities to minimize ongoing and future operating and capital costs in light of the deferral of mining and transitioning to stockpile processing.


Estimated Mineral Resources at the Asanko Gold Mine Details (100% basis)

Updated MRE's are reported for the eight deposits that make up the AGM, replacing the previous MRE dated December 31, 2019. The Technical Report replaces the previous technical report titled "NI 43-101 Technical Report for the Asanko Gold Mine, Ghana (Amended and Restated)" published in June 2020 and all other previous technical reports. The effective date of the MRE is February 28, 2022, presented in the form of a combined global Mineral Resource table below.

Table 1: Mineral Resource Estimates at a 0.5 g/t Au cut-off and at $1,600/oz Au as of February 28, 2022

 

Measured

Indicated

Measured & Indicated Total

Inferred

Deposit

Tonnes
(Mt)

Au
grade
(g/t)

Au
Contained
(koz)

Tonnes
(Mt)

Au
grade
(g/t)

Au
Contained
(koz)

Tonnes
(Mt)

Au
grade
(g/t)

Au
Contained
(koz)

Tonnes
(Mt)

Au
grade
(g/t)

Au
Contained
(koz)

Nkran

--

--

--

12.1

2.09

814

12.1

2.09

814

1.3

2.23

96

Esaase

10.9

1.25

437

11.7

1.27

475

22.6

1.26

912

0.6

1.22

25

Akwasiso

--

--

--

1.7

1.31

69

1.7

1.31

69

0.2

1.46

7

Abore

3.2

1.46

150

5.1

1.23

203

8.3

1.32

353

1.1

1.55

55

Adubiaso

--

--

--

1.6

1.80

90

1.6

1.80

90

0.2

1.38

9

Asuadai

--

--

--

1.6

1.29

67

1.6

1.29

67

0.0

1.17

1

Miradani North

--

--

--

7.1

1.28

293

7.1

1.28

293

2.6

1.21

102

Dynamite Hill

--

--

--

1.9

1.39

85

1.9

1.39

85

0.3

1.26

14

Stockpiles

9.5

0.72

221

--

--

--

9.5

0.72

221

--

--

--

Total

23.6

1.06

808

42.7

1.53

2,096

66.4

1.36

2,904

6.4

1.49

309

Notes:

The new Mineral Resource model for Esaase differs from the 2019 model primarily due to an update to the underlying geology and mineralization models. This modeling is the culmination of new information gained over the past 18 months through infill and grade control drilling, logging and relogging of drill core, mining and processing data and bench by bench geological mapping. 

Galiano believes that the new 2022 Esaase resource model better reflects the Company's current geological understanding of the deposit, both at the macro and micro scales, and is better aligned with ore control data and recent operating results. 

The MRE for the Esaase and Abore deposits have been prepared by Mario E. Rossi, FAusIMM, SME, IAMG, and Principal Geostatistician of Geosystems International Inc. Mr. Rossi is a qualified person pursuant to NI 43-101 and is independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.


The MRE for Nkran has been prepared by Malcolm Titley, MAIG, MAusIMM who is a Principal Consultant of CSA Global. Mr. Titley is a qualified person pursuant to NI 43-101 and is independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.

The MRE for Akwasiso,  Miradani North, and Dynamite Hill, have been prepared by Eric Chen, P.Geo. who is Galiano Gold's former Vice President of Technical Services. The Mineral Resource Estimates for Adubiaso, Asuadai and Stockpiles have been prepared by others and reviewed and accepted by Mr. Chen. Mr. Chen is a qualified person pursuant to NI 43-101 and is not independent of Galiano Gold in accordance with the application of Section 1.5 of National Instrument 43-101.

Richard Miller P.Eng., Vice President Technical Services of Galiano Gold Inc., is a qualified person pursuant to NI 43-101 and has approved the scientific and technical information contained in this news release.

About Galiano Gold Inc.

Galiano is focused on creating a sustainable business capable of long-term value creation for its stakeholders through exploration and disciplined deployment of its financial resources. The Company currently operates and manages the Asanko Gold Mine, located in Ghana, West Africa which is jointly owned with Gold Fields Ltd.  The Company is strongly committed to the highest standards for environmental management, social responsibility, and health and safety for its employees and neighbouring communities. For more information, please visit www.galianogold.com.

Cautionary Note Regarding Forward-Looking Statements

Certain statements and information contained in this news release constitute "forward-looking statements" within the meaning of applicable U.S. securities laws and "forward-looking information" within the meaning of applicable Canadian securities laws, which we refer to collectively as "forward-looking statements". Forward-looking statements are statements and information regarding possible events, conditions or results of operations that are based upon assumptions about future conditions and courses of action. All statements and information other than statements of historical fact may be forward looking statements. In some cases, forward-looking statements can be identified by the use of words such as "seek", "expect", "anticipate", "budget", "plan", "estimate", "continue", "forecast", "intend", "believe", "predict", "potential", "target", "may", "could", "would", "might", "will" and similar words or phrases (including negative variations) suggesting future outcomes or statements regarding an outlook.

Forward-looking statements in this news release include, but are not limited to: the operating plans for the AGM under the JV between the Company and Gold Fields; the estimation of Mineral Resources; the publication of Mineral Reserve  estimates in the future; plans to transition from mining to processing stockpiles (and the benefits that may arise therefrom), and with respect to the re-start of mining operations thereafter; the Company's intention to prepare a revised optimized mine plan and a further updated technical report supporting the new life of mine plan; any additional work programs to be undertaken by the Company; and activities to be completed while mining activities are temporarily paused. Such forward-looking statements are based on a number of material factors and assumptions, including, but not limited to: the Company and Gold Fields will agree on the manner in which the JV will operate the AGM, including agreement on development plans and capital expenditures; the price of gold will not decline significantly or for a protracted period of time; the accuracy of the estimates and assumptions underlying Mineral Resources estimates; the ability of the AGM to continue to operate, produce and ship doré from the AGM site to be refined during the COVID-19 pandemic or any other infectious disease outbreak; the Company's ability to raise sufficient funds from future equity financings to support its operations, and general business and economic conditions; the global financial markets and general economic conditions will be stable and prosperous in the future; the ability of the JV and the Company to comply with applicable governmental regulations and standards; the mining laws, tax laws and other laws in Ghana applicable to the AGM and the JV will not change, and there will be no imposition of additional exchange controls in Ghana; the success of the JV and the Company in implementing its development strategies and achieving its business objectives; the JV will have sufficient working capital necessary to sustain its operations on an ongoing basis and the Company will continue to have sufficient working capital to fund its operations and contributions to the JV; and the key personnel of the Company and the JV will continue their employment.


The foregoing list of assumptions cannot be considered exhaustive.

Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause actual results, performance or achievements to differ materially from those anticipated in such forward-looking statements. The Company believes the expectations reflected in such forward-looking statements are reasonable, but no assurance can be given that these expectations will prove to be correct and you are cautioned not to place undue reliance on forward-looking statements contained herein. Some of the risks and other factors which could cause actual results to differ materially from those expressed in the forward-looking statements contained in this news release, include, but are not limited to: the mineral resource estimates may change and may prove to be inaccurate; mineral reserves may not be reinstated; metallurgical recoveries may not be economically viable; risks associated with the Company ceasing its mining operations during 2022; the Company does not currently have a LOM estimate for the AGM due to the withdrawal of the mineral reserve; actual production, costs, returns and other economic and financial performance may vary from the Company's estimates in response to a variety of factors, many of which are not within the Company's control; AGM has a limited operating history and is subject to risks associated with establishing new mining operations; sustained increases in costs, or decreases in the availability, of commodities consumed or otherwise used by the Company may adversely affect the Company; adverse geotechnical and geological conditions (including geotechnical failures) may result in operating delays and lower throughput or recovery, closures or damage to mine infrastructure; the ability of the Company to treat the number of tonnes planned, recover valuable materials, remove deleterious materials and process ore, concentrate and tailings as planned is dependent on a number of factors and assumptions which may not be present or occur as expected; the Company's operations may encounter delays in or losses of production due to equipment delays or the availability of equipment; outbreaks of COVID-19 and other infectious diseases may have a negative impact on global financial conditions, demand for commodities and supply chains and could adversely affect the Company's business, financial condition and results of operations and the market price of the common shares of the Company; the Company's operations are subject to continuously evolving legislation, compliance with which may be difficult, uneconomic or require significant expenditures; the Company may be unsuccessful in attracting and retaining key personnel; labour disruptions could adversely affect the Company's operations; the Company's business is subject to risks associated with operating in a foreign country; risks related to the Company's use of contractors; the hazards and risks normally encountered in the exploration, development and production of gold; the Company's operations are subject to environmental hazards and compliance with applicable environmental laws and regulations; the effects of climate change or extreme weather events may cause prolonged disruption to the delivery of essential commodities which could negatively affect production efficiency; the Company's operations and workforce are exposed to health and safety risks; unexpected costs and delays related to, or the failure of the Company to obtain, necessary permits could impede the Company's operations; the Company's title to exploration, development and mining interests can be uncertain and may be contested; geotechnical risks associated with the design and operation of a mine and related civil structures; the Company's properties may be subject to claims by various community stakeholders; risks related to limited access to infrastructure and water; the Company's exploration programs may not successfully reinstate mineral reserves; risks associated with establishing new mining operations; the Company's common shares may experience price and trading volume volatility; the Company has never paid dividends; the Company's revenues are dependent on the market prices for gold, which have experienced significant recent fluctuations; the Company may not be able to secure additional financing when needed or on acceptable terms; Company shareholders may be subject to future dilution; risks related to the control of AGM cashflows and operation through a joint venture; risks related to changes in interest rates and foreign currency exchange rates; risks relating to credit rating downgrades; changes to taxation laws applicable to the Company may affect the Company's profitability and ability to repatriate funds; ability to repatriate funds; risks related to the Company's internal controls over financial reporting and compliance with applicable accounting regulations and securities laws; non-compliance with public disclosure obligations could have an adverse effect on the Company's stock price; the carrying value of the Company's assets may change and these assets may be subject to impairment charges; risks associated with changes in reporting standards; the Company's primary asset is held through a joint venture, which exposes the Company to risks inherent to joint ventures, including disagreements with joint venture partners and similar risks; the Company may be liable for uninsured or partially insured losses; the Company may be subject to litigation; damage to the Company's reputation could result in decreased investor confidence and increased challenges in developing and maintaining community relations which may have adverse effects on the business, results of operations and financial conditions of the joint venture and the Company and the Company's share price; the Company may be unsuccessful in identifying targets for acquisition or completing suitable corporate transactions, and any such transactions may not be beneficial to the Company or its shareholders; the Company must compete with other mining companies and individuals for mining interests; risks related to information systems security threats; the Company's growth, future profitability and ability to obtain financing may be impacted by global financial conditions; and the risk factors described under the heading "Risk Factors" in the Company's Annual Information Form.


Although the Company has attempted to identify important factors that could cause actual results or events to differ materially from those described in the forward-looking statements, you are cautioned that this list is not exhaustive and there may be other factors that the Company has not identified. Furthermore, the Company undertakes no obligation to update or revise any forward-looking statements included in, or incorporated by reference in, this news release if these beliefs, estimates and opinions or other circumstances should change, except as otherwise required by applicable law.

Neither Toronto Stock Exchange nor the Investment Industry Regulatory Organization of Canada accepts responsibility for the adequacy or accuracy of this release.

Cautionary Note to United States Investors Concerning Estimates of Measured, Indicated and Inferred Resources

Disclosure regarding the Company's mineral properties, including with respect to mineral resource estimates included in this release, was prepared in accordance with Canadian National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101"). NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. NI 43-101 differs significantly from the disclosure requirements of the SEC generally applicable to U.S. companies. Accordingly, information contained in this annual report is not comparable to similar information made public by U.S. companies reporting pursuant to SEC disclosure requirements.

Source: Galiano Gold Inc.

Enquiries:

Peter Lekich

VP Investor Relations

Toll-Free (N. America): 1-855-246-7341

Telephone: 1-778-729-0608

Email: peter.lekich@galianogold.com