Denison Mines Corp 6-K, filed Jul 28, 2026
Denison Mines Corp. (DNN)
6-K
2026-07-28
For: 2026-07-28
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July 28, 2026
About this 6-K
Denison Mines Corp filed this 6-K on July 28, 2026.
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
Date: July 28, 2026
Commission File Number: 001-33414
Denison Mines Corp.
(Name of
registrant)
1100-40 University Avenue
Toronto Ontario
M5J 1T1 Canada
(Address of
principal executive offices)
Indicate by check mark whether the registrant files
or will file annual reports under cover Form 20-F or Form
40-F.
Form
20-F ☐ Form 40-F ☒
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): ☐
SIGNATURES
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.
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DENISON MINES
CORP.
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/s/ Amanda Willett
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Date: July 28, 2026
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Amanda
Willett
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Vice
President Legal and Corporate Secretary
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FORM 6-K
EXHIBIT INDEX
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Exhibit Number
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Description
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99.1
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Press release dated July 28, 2026 |
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Exhibit 99.1
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Denison Mines
Corp.
1100 – 40
University Ave
Toronto, ON M5J
1T1
www.denisonmines.com
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PRESS RELEASE
Denison Announces Completion of Site Preparation
Activities
and Commencement of Full-Scale Construction at Phoenix ISR Uranium
Mine
Toronto, ON – July 28,
2026. Denison Mines Corp. (“Denison” or the
“Company”) (TSX: DML, NYSE American: DNN) is pleased to
announce that activities at the Phoenix In-Situ Recovery
(“ISR”) uranium mine (“Phoenix” or the
“Project”) have transitioned from site preparations to
full-scale construction, including initiation of the perimeter
freeze wall installation for Phase 1 of the
mine.
Since
the commencement of site preparation and early works in March 2026,
significant progress has been made by Denison and its construction
partners to complete several critical site preparation activities
– including substantial completion of site clearing
activities, advancement of schedule-sensitive site civil works, and
the establishment of construction management facilities.
Preparation activities also involved the installation and
commissioning of temporary construction camp facilities, which
significantly increases the accommodation capacity of the Wheeler
River property to nearly 400 people and allows a ramp-up in the
on-site workforce.
Additionally,
aggregate production required for various site civil purposes
continues at a nearby quarry, and the concrete batch plant has been
mobilized to site. Schedule-critical concrete-related activities
for the substation and the main process plant foundations are
currently expected to commence in August.
David Cates,
President & CEO of Denison, commented, “Completing the
site-preparation activities needed to ramp up our on-site workforce
and achieve a full-scale rate of construction is an important
initial milestone for the Phoenix project.
Site civil work has progressed well during the early works program,
with +20% of overall site civil work estimated
to be completed to date. Importantly, we have achieved near 100%
completion of civil subgrade work for the process plant and
wellfield areas, which is needed to facilitate the planned concrete
pour for the plant and the initiation of the freeze wall
installation program.
Construction activity is expected to accelerate through the
remainder of the summer months with the commencement of a second
shift, which means seasonally sensitive civil and other
construction work can continue virtually 24-hours a day in support
of the completion of our key first-year construction milestones
– including concrete pours of the foundations for the process
plant and main power transformer, installation of the freeze wall,
as well as earth works for the airstrip and on-site power
distribution.
Achieving these positive early results demonstrates the readiness
and commitment of Denison and our construction partners as we
advance this unique nation-building project to become
Canada’s first new large-scale uranium mine since Cigar
Lake.”
About Wheeler River
Wheeler River is the largest undeveloped uranium project in the
infrastructure-rich eastern portion of the Athabasca
Basin region, in northern Saskatchewan. Wheeler River is host to
the high-grade Phoenix and Gryphon uranium deposits, discovered by
Denison in 2008 and 2014, respectively, and is a joint venture
between Denison (90% and operator) and JCU (Canada) Exploration
Company Limited (“JCU”, 10%). In August 2023, Denison
filed a technical report (the “Wheeler River Report”)
summarizing the results of (i) Phoenix Feasibility Study; and (ii)
a cost update to the 2018 Pre-Feasibility Study for conventional
underground mining of the basement-hosted Gryphon uranium deposit.
Based on the respective studies, both deposits have the potential
to be competitive with the lowest cost uranium mining operations in
the world. Permitting efforts for the planned Phoenix ISR operation
commenced in 2019, culminating in the July 2025 approval of the
Project’s Environmental Assessment (“EA”) by the
Province of Saskatchewan and the February 2026 approval of the
Project’s EA and the grant of the construction licence by the
Canadian Nuclear Safety Commission. Full-scale construction
commenced for Phoenix in July 2026. More information is available
in the technical report titled “NI 43-101 Technical Report on
the Wheeler River Project Athabasca Basin, Saskatchewan,
Canada” dated August 8, 2023 with an effective date
of June 23, 2023, and an update to estimated Phoenix initial
capital costs described in Denison’s Annual Information Form
dated March 30, 2026, copies of which are available on
Denison’s website and under its profile on SEDAR+ at
www.sedarplus.ca and on EDGAR
at www.sec.gov/edgar.
About Denison
Denison is a leading uranium exploration and development company
with interests focused in the Athabasca Basin region of northern
Saskatchewan, Canada. In addition to Denison’s effective 95%
interest in its flagship Wheeler River Project, Denison's interests
in Saskatchewan include a 22.5% ownership interest in the McClean
Lake Joint Venture ("MLJV"), which includes uranium deposits (with
mining at the McClean North deposit having commenced in 2025 using
the MLJV's SABRE mining method) and the McClean Lake uranium mill
(currently utilizing a portion of its licensed capacity to process
the ore from the Cigar Lake mine under a toll milling agreement),
plus a 25.17% interest in the Midwest Joint Venture Midwest Main
and Midwest A deposits, and a 70.55% interest in the Tthe Heldeth
Túé ("THT") and Huskie deposits on the Waterbury Lake
Property. The Midwest Main, Midwest A, THT and Huskie deposits are
located within 20 kilometres of the McClean Lake mill. Taken
together, Denison has direct ownership interests in properties
covering ~457,000 hectares in the Athabasca Basin
region.
Additionally, through its 50% ownership of JCU (Canada) Exploration
Company, Limited (“JCU”), Denison holds interests in
various uranium project joint ventures in Canada, including the
Millennium project (JCU, 30.099%), the Kiggavik project (JCU,
33.8118%) and Christie Lake (JCU, 34.4508%).
In 2024, Denison celebrated its 70th year in uranium mining,
exploration, and development, which began in 1954 with
Denison’s first acquisition of mining claims in the Elliot
Lake region of northern Ontario.
For more information, please contact
David
Cates
(416) 979-1991 ext.
362
President and
Chief Executive Officer
Geoff Smith
(416) 979-1991 ext. 358
Vice
President Corporate Development & Commercial
Follow Denison on Twitter
@DenisonMinesCo
CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING
STATEMENTS
Certain information contained in this news release
constitutes 'forward-looking information', within the meaning of
the applicable United States and Canadian legislation, concerning
the business, operations and financial performance and condition of
Denison. Generally, these forward-looking statements can be
identified by the use of forward-looking terminology such as
'potential', 'plans', 'expects', 'budget', 'scheduled',
'estimates', 'forecasts', 'intends', 'anticipates', or 'believes',
or the negatives and/or variations of such words and phrases, or
state that certain actions, events or results 'may', 'could',
'would', 'might' or 'will' 'be taken', 'occur' or 'be achieved'. In
particular, this news release contains forward-looking information
pertaining to Denison's current expectations, intentions and
objectives with respect to Wheeler River and Phoenix, including the
Company's outlook generally with respect to ISR mine
development and operations, and milestones related thereto, for
Phoenix.
Forward
looking statements are based on the opinions and estimates of
management as of the date such statements are made, and they are
subject to known and unknown risks, uncertainties and other factors
that may cause the actual results, level of activity, performance
or achievements of Denison to be materially different from those
expressed or implied by such forward-looking statements. For
example, the results and underlying assumptions and interpretations
of its technical studies and cost forecasting may not be maintained
after further testing, procurement, or operations, or be
representative of actual conditions at the Project or within the
applicable deposits. In addition, Denison may decide or otherwise
be required to discontinue work if it is unable to maintain or
otherwise secure the necessary resources (such as equipment,
staffing, contractors, testing facilities, capital funding, joint
venture approvals, regulatory approvals, etc.). Denison believes
that the expectations reflected in this forward-looking information
are reasonable but no assurance can be given that these
expectations will prove to be accurate and results may differ
materially from those anticipated in this forward-looking
information. For a discussion in respect of risks and other factors
that could influence forward-looking events, please refer to the
factors discussed in Denison's Annual Information Form dated March
30, 2026 under the heading 'Risk Factors' or in subsequent
quarterly financial reports. These factors are not, and should not
be construed as being, exhaustive.
Accordingly,
readers should not place undue reliance on forward-looking
statements. The forward-looking information contained in this news
release is expressly qualified by this cautionary statement. Any
forward-looking information and the assumptions made with respect
thereto speaks only as of the date of this news release. Denison
does not undertake any obligation to publicly update or revise any
forward-looking information after the date of this news release to
conform such information to actual results or to changes in
Denison's expectations except as otherwise required by applicable
legislation.
Figure 1. Phoenix ISR Mine, Site Preparation Progress as of April
30, 2026
Figure 2. Phoenix ISR Mine, Civil Works for Wellfield, Process
Plant, and Substation Areas as of July 21, 2026
Figure 3. Temporary Construction Camp Facilities Installation
Progress at the Phoenix Site as of July 6, 2026
Figure 4. Airstrip Site Preparation (Phoenix site in the distances)
as of July 25, 2026
