Aris Mining Corp 6-K, filed Sep 3, 2025

About this 6-K

Aris Mining Corp (ARIS)

6-K 2025-09-03 For: 2025-09-03

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Added on July 04, 2026

ARIS MINING CORPORATION

(s) Ashley Baker

Ashley Baker

General Counsel and Corporate Secretary

Aris Mining Corp filed this 6-K on September 3, 2025.

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Exhibit Number		Description

99.1		NI 43-101 Technical Report Prefeasibility Study for the Soto Norte Project, Santander, Colombia, dated September 3, 2025


Figures and tables			14

1 Summary			16

1.1 Introduction			16

1.2 Property description, location, and access			18

1.2.1 Location and access			18

1.2.2 Mineral tenure, Aris Mining’s interest, surface rights, and obligations			18

1.2.3 Royalties, agreements, and encumbrances			18

1.2.4 Significant factors and risks			18

1.3 History			19

1.4 Geological setting, mineralization, and deposit types			20

1.4.1 Regional, local, and property geology			20

1.4.2 Mineralization			20

1.4.3 Deposit types			21

1.5 Exploration			21

1.6 Drilling			22

1.7 Sampling, analysis, and data verification			22

1.7.1 Sample preparation			22

1.7.2 Quality assurance and quality control			22

1.7.3 Security measures			23

1.7.4 Analytical procedures			23

1.7.5 Data verification			23

1.8 Mineral processing and metallurgical testing			24

1.8.1 Testwork history			24

1.8.2 Mineralogical testwork			25

1.8.3 Comminution testwork			25

1.8.4 Gravity separation and flotation testwork			25

1.8.5 Deleterious elements			26

1.8.6 Metallurgical recovery			26

1.9 Mineral resource and mineral reserve estimates			26



1.9.1 Mineral resource estimate			26

1.9.2 Mineral reserve estimate			27

1.10 Mining operations			27

1.11 Processing and recovery operations			28

1.12 Infrastructure, permitting, and compliance activities			29

1.12.1 Mine infrastructure			29

1.12.2 Rope conveyor system			29

1.12.3 Process support facilities			29

1.12.4 Filtered tailings storage facilities			30

1.12.5 Water sources and management			31

1.12.6 Power			32

1.12.7 Environmental factors			32

1.12.8 Permitting factors			33

1.12.9 Social or community factors			34

1.13 Capital and operating costs			36

1.13.1 Capital cost estimates			36

1.13.2 Operating cost estimates			37

1.14 Economic analysis			38

1.15 Exploration, development, and production			41

1.16 Conclusions			41

1.17 Recommendations			41

2 Introduction			44

2.1 Issuer and purpose of the technical report			44

2.2 Source information			44

2.3 Qualified persons and personal inspections			44

2.4 Currencies, units, and coordinate system			45

3 Reliance on other experts			46

4 Property description and location			47

4.1 Property location			47

4.2 Mineral tenure and Aris Mining’s interest			47

4.3 Surface rights and legal access			50



4.4 Royalties, agreements, and encumbrances			50

4.5 Environmental liabilities			51

4.6 Permits			51

4.7 Significant factors and risks			52

5 Accessibility, climate, local resources, infrastructure, and physiography			53

5.1 Property access, transport, population centres, and mining personnel			53

5.2 Topography, elevation, vegetation, and climate			54

5.3 Surface rights and surface area			54

5.4 Power and water			54

6 History			56

6.1 Early history and historical production			56

6.2 Ownership history			56

6.3 Exploration and development work			56

6.3.1 Ventana			56

6.3.2 AUX Colombia			56

6.3.3 Minesa and Aris Mining			57

6.4 Historical mineral resource and mineral reserve estimates			57

7 Geological setting and mineralization			58

7.1 Regional geology			58

7.2 Local geology			59

7.3 Property geology			60

7.4 Mineralization and alteration			61

8 Deposit types			62

9 Exploration			63

9.1 2006 to 2011 Ventana			63

9.2 2011 to 2013 AUX Colombia			63

9.3 2015 to 2018 Minesa			63

9.4 Recommendations			63

10 Drilling			65

10.1 Drilling summary			65

10.2 Drilling methods			65


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10.2.1 Drillhole collar and downhole surveys			66

10.3 Drilling, sampling, and recovery factors			66

11 Sample preparation, analysis, and security			67

11.1 Introduction			67

11.2 Channel sampling and security			67

11.2.1 Ventana			67

11.2.2 AUX Colombia			67

11.2.3 Minesa			67

11.3 Soil sampling and security			67

11.3.1 Ventana			67

11.3.2 AUX Colombia			67

11.3.3 Minesa			67

11.4 Drillhole sampling, QAQC, and security			68

11.4.1 Overview			68

11.4.2 Ventana			68

11.4.3 AUX Colombia			69

11.4.4 Minesa			69

11.5 Laboratory sample preparation and analytical methods			69

11.5.1 Ventana			69

11.5.2 AUX Colombia			70

11.5.3 Minesa			70

11.6 Bulk density measurements			70

11.7 Adequacy of the sample preparation, security, and analytical procedures			70

12 Data verification			72

12.1 Geology data reviews			72

12.2 Mine engineering data reviews			72

12.3 Metallurgy and processing data reviews			73

12.4 Filtered tailings storage facility data reviews			73

13 Mineral processing and metallurgical testing			74

13.1 Introduction			74

13.2 Samples			74


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13.3 Mineralogy and characterization			76

13.4 Comminution			77

13.5 Gravity separation and flotation			78

13.6 Thickening and filtration			80

13.7 Deleterious elements			80

13.8 Environmental characterization			80

13.9 Conclusions and recommendations			81

14 Mineral resource estimates			83

14.1 Disclosure			83

14.2 Available data			83

14.3 Geological interpretation			83

14.4 Statistics, sample compositing, and treatment of extreme grades			83

14.5 Block model construction and depletion for mining			84

14.6 Composite search and interpolation parameters			84

14.7 Estimation validation			84

14.8 Mineral resource classification			87

14.9 Cut-off grade and mineral resource constraint			87

14.10 Mineral resource tabulation			87

14.11 Mineral resource sensitivity to cut-off grade			88

14.12 Recommendations			89

15 Mineral reserve estimates			90

15.1 Disclosure			90

15.2 Method			90

15.2.1 Cut-off grade			90

15.2.2 Stope optimization			90

15.3 Mineral reserve tabulation			91

16 Mining methods			92

16.1 Introduction			92

16.2 Mine access and general layout			92

16.3 Underground infrastructure			93

16.4 Material handling			93


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16.5 Hydrology and hydrogeology			94

16.5.1 Introduction			94

16.5.2 Hydrology			94

16.5.3 Hydrogeology			94

16.6 Mine water management			95

16.7 Mine ventilation			95

16.8 Mine geotechnical parameters			96

16.9 Mining method			97

16.10 Backfill			98

16.11 Mine planning and schedule			99

16.12 Mine equipment			101

16.13 Mine personnel			103

16.14 Recommendations			105

17 Recovery methods			106

17.1 Introduction			106

17.2 Process description			107

17.2.1 Feed preparation and transfer to surface			107

17.2.2 Grinding and gravity concentration			107

17.2.3 Sequential copper and pyrite flotation and regrind			107

17.2.4 Concentrate dewatering			108

17.2.5 Thickened tailings dewatering and storage			108

17.3 Reagents and consumables			109

17.4 Power, water, and air			109

17.5 Conclusions			110

18 Project infrastructure			112

18.1 Introduction			112

18.2 Surface mine infrastructure			112

18.3 Rope conveyor system			113

18.3.1 Introduction			113

18.3.2 Capacity			114

18.3.3 Design			116


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18.3.4 Operation			116

18.3.5 Closure			116

18.3.6 Conclusions			116

18.4 Process support facilities			116

18.5 Filtered tailings storage facilities			117

18.5.1 Site description			117

18.5.2 Site investigations and engineering analyses			118

18.5.3 Design			118

18.5.4 Water management			119

18.5.5 Tailings placement			120

18.5.6 Closure			120

18.5.7 Post closure monitoring			121

18.5.8 Recommendations			122

18.6 Stormwater management			123

18.6.1 Introduction			123

18.6.2 Stormwater management plan			123

18.6.3 Stormwater management infrastructure			123

18.6.4 Recommendations			123

18.7 Utilities			124

18.7.1 Water sources and water treatment facilities			124

18.7.2 Power			124

18.7.3 Fuel			125

18.8 Terracing			125

18.9 On site roads			125

18.10 Off site logistics			125

19 Market studies and contracts			127

19.1 Market studies			127

19.1.1 Indicative commercial terms for the copper concentrates			127

19.1.2 Indicative commercial terms for the pyrite concentrates			127

19.1.3 Indicative commercial terms for the gravity recovered gold concentrates			127

19.2 Contracts			128


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19.3 Review and confirmation by the qualified person			128

20 Environmental studies, permitting, and social or community impact			129

20.1 Environmental setting, studies, and issues			129

20.1.1 Environmental setting			129

20.1.2 Environmental studies			129

20.1.3 Environmental management approach			129

20.1.4 Historical environmental liabilities			130

20.2 Social setting and community requirements			130

20.2.1 Social setting			130

20.2.2 Community engagement			130

20.2.3 Community employment, diversity, and socioeconomic opportunities			131

20.2.4 Contract mining partners			131

20.2.5 Land acquisition and resettlement			132

20.3 Filtered tailings facility and waste rock management			132

20.4 Site monitoring			132

20.5 Water management			132

20.5.1 Groundwater management			133

20.5.2 Extractive wastewater management			133

20.5.3 Water supply management			134

20.6 Permitting requirements			134

20.7 Mine closure requirements			135

20.8 Recommendations			136

21 Capital and operating costs			137

21.1 Capital cost estimate methodology			137

21.1.1 Processing facilities and surface infrastructure capital costs			137

21.1.2 Underground mining infrastructure capital costs			138

21.1.3 Capital cost summary			138

21.2 Operating cost estimate			139

21.2.1 Estimate methodology for processing and rope conveyor operating costs			139

21.2.2 Estimate methodology for underground mining operating costs			140

21.2.3 Estimate methodology for G&A operating costs			140


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21.2.4 Operating cost summary			140

22 Economic analysis			143

22.1 Estimate methodology			143

22.2 Project schedule			143

22.3 Taxes and royalties			146

22.4 Marketing assumptions			146

22.5 Commodity prices and gross revenue			146

22.6 Economic analysis results			148

22.7 Sensitivity analysis			151

22.8 Conclusions			152

23 Adjacent properties			153

24 Other relevant data and information			154

25 Interpretation and conclusions			155

26 Recommendations			156

27 References			158

28 Date, signatures, and certificates of Qualified Persons			159


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Table 1-1	Soto Norte mineral resources effective August 18, 2025	27

Table 1-2	Soto Norte mineral reserves effective August 18, 2025	27

Table 1-3	Estimated initial capital costs	36

Table 1-4	Estimated deferred and sustaining capital costs	37

Table 1-5	Estimated operating costs	37

Table 1-6	Estimated life of mine unit operating costs	38

Table 1-7	Total life of mine production	39

Table 1-8	Total life of mine concentrate production	39

Table 1-9	Soto Norte economic evaluation results	39

Table 1-10	Sensitivity of NPV to discount rate	40

Table 1-11	Sensitivity of key economic indicators to gold price	40

Table 2-1	Responsibilities of each qualified person	45

Table 4-1	Property mineral title summary	48

Table 10-1	Drilling summary	65

Table 14-1	Composite statistics	84

Table 14-2	Mineral resource cut-off grade	87

Table 14-3	Soto Norte mineral resources effective August 18, 2025	88

Table 15-1	Mineral reserve cut-off grade	90

Table 15-2	Soto Norte mineral reserves effective August 18, 2025	91

Table 16-1	Annual mine development schedule	101

Table 16-2	Annual mine production schedule	101

Table 16-3	Mine equipment fleet	101

Table 16-4	Annual mine equipment schedule	102

Table 16-5	Annual mine personnel requirements	103

Table 21-1	Estimated initial capital costs	138

Table 21-2	Estimated deferred and sustaining capital costs	139

Table 21-3	Estimated annual capital expenditure schedule	139

Table 21-4	Estimated capital expenditure per depreciation class	139

Table 21-5	Estimated operating costs	141

Table 21-6	Estimated life of mine unit operating costs	141

Table 21-7	Estimated annual life of mine operating cost schedule	142

Table 22-1	Total life of mine production	143

Table 22-2	Total life of mine concentrate production	144

Table 22-3	Annual mining and processing schedule	145

Table 22-4	Life of mine average concentrate marketing terms	146

Table 22-5	Annual payable metals, gold revenue, by-product credits, and treatment and refining

charges, penalties, and shipping costs		147


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Table 22-6	Economic evaluation results	148

Table 22-7	Sensitivity of NPV to discount rate	148

Table 22-8	Annual after tax cash flow schedule	149

Table 22-9	Sensitivity of key economic indicators to gold price	151

Table 22-10	Sensitivity of NPV5% to operating and capital costs and gold price	151

Figure 4-1	Property location map - source Aris Mining 2025	47

Figure 4-2	Property mineral title plan – source Aris Mining 2025	49

Figure 5-1	Property access map - source Google 2025	53

Figure 7-1	Map of the regional geology – adapted from the Colombian Geological Service 2025	58

Figure 7-2	Map of the local geology – source Aris Mining 2025	59

Figure 7-3	Plan of the Property mineralized vein systems – source Aris Mining 2025	60

Figure 7-4	Long section of the Property mineralized vein systems – source Aris Mining 2025	61

Figure 13-1	Long sections of metallurgical testwork sample locations – source Aris Mining, 2025	75

Figure 14-1	Cross sections of estimated and input composite gold grades – Source Aris Mining 2025	85

Figure 14-2	Mineral resource sensitivity to cut-off grade - Source Mining Plus 2025	88

Figure 16-1	Plan view of mine design - Source Aris Mining 2025	92

Figure 16-2	Long section of mine design - Source Aris Mining 2025	93

Figure 16-3	Long sections of stope widths – Source Aris Mining 2025	97

Figure 16-4	Long sections of stope gold grades – Source Aris Mining 2025	99

Figure 17-1	Soto Norte processing flow sheet – Source LogiProc 2025	106

Figure 18-1	Project infrastructure plan – Source Aris Mining 2025	112

Figure 18-2	Mine area surface infrastructure plan – Source Aris Mining 2025	113

Figure 18-3	Example of a rope conveyor system on similar terrain – source Doppelmayr 2025	114

Figure 18-4	Plan of the rope conveyor system route – source Aris Mining 2025	115

Figure 18-5	Long section of the rope conveyor system route – adapted from Doppelmayr 2025	115

Figure 18-6	Plan of process support facilities – Source Aris Mining 2025	117

Figure 18-7	Plan of filtered tailings storage facilities – Source Aris Mining 2025	119

Figure 22-1	Annual tonnes mined over the life of mine – Source Mining Plus 2025	144

Figure 22-2	Annual processed grade and gold produced in concentrates – Source Mining Plus 2025	144

Figure 22-3	Sensitivity of NPV5% to operating and capital costs and gold price – Source Mining Plus 2025	151


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