Denison Mines (NYSE: DNN) files Form 40-F, highlights Wheeler River progress
Filing Impact
Filing Sentiment
Form Type
6-K
Rhea-AI Filing Summary
Denison Mines Corp. has filed its 2025 Annual Report on Form 40-F with the U.S. Securities and Exchange Commission. The filing includes the company’s annual information form, management discussion and analysis, and audited financial statements for the year ended December 31, 2025.
The Form 40-F is available on Denison’s website and on the SEC’s EDGAR system, while the annual information form is also accessible on SEDAR+. Security holders can request a free printed copy of the Form 40-F, including audited financial statements, by email or mail.
The press release also outlines Denison’s uranium portfolio in Saskatchewan’s Athabasca Basin, including a 95% interest in the Wheeler River project, completed feasibility and pre-feasibility studies for the Phoenix and Gryphon deposits, recent environmental assessment approvals and a Construction Licence for Phoenix, and ownership interests in several nearby deposits and joint ventures.
Positive
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Key Figures
Reporting period end: December 31, 2025
Wheeler River interest: 95%
McClean Lake JV interest: 22.5%
+5 more
8 metrics
Reporting period end
December 31, 2025
Year ended for audited financial statements in Form 40-F
Wheeler River interest
95%
Effective interest in flagship Wheeler River Uranium Project
McClean Lake JV interest
22.5%
Ownership in McClean Lake Joint Venture, which restarted mining with SABRE in 2025
Midwest JV interest
25.17%
Interest in Midwest Main and Midwest A deposits via Midwest Joint Venture
THT and Huskie interest
70.55%
Ownership in Tthe Heldeth Túé and Huskie deposits on Waterbury Lake Property
Athabasca land package
≈457,000 hectares
Direct ownership interests in properties in the Athabasca Basin region
JCU Millennium interest
30.099%
Interest in Millennium project through 50% ownership of JCU
Phoenix EA approvals
July 2025 & February 2026
Provincial and federal Environmental Assessment approvals and Construction Licence
Key Terms
Form 40-F, ISR mining operation, Environmental Assessment, Construction Licence, +2 more
6 terms
Form 40-F regulatory
"Denison Announces Filing of Annual Report on Form 40-F"
A Form 40-F is a standardized annual filing used by certain Canadian companies that trade in U.S. markets to give U.S. regulators and investors the same core financial statements and key disclosures they file in Canada. Think of it as a translated, formally packaged annual report that lets investors in a different marketplace compare a company’s results, governance and risks more easily, which reduces uncertainty and helps investment decisions.
ISR mining operation technical
"Phoenix feasibility study was completed for the Phoenix deposit as an ISR mining operation"
An ISR mining operation, or In-Situ Recovery mining, is a method of extracting minerals from underground deposits without traditional digging or excavation. Instead, liquids are injected into the ground to dissolve the minerals, which are then pumped to the surface for processing. This approach can be less disruptive and more cost-effective, making it an important consideration for investors evaluating a company's potential and environmental impact.
Environmental Assessment regulatory
"the project’s Environmental Assessment (“EA”) by the Province of Saskatchewan"
An environmental assessment is a process that evaluates how a project or activity might impact the natural surroundings, such as air, water, land, and wildlife. It helps identify potential environmental risks and ensures that any negative effects are managed or minimized. For investors, this assessment provides insight into the sustainability and long-term viability of projects, which can influence their financial decisions and risk management.
Construction Licence regulatory
"federal approval of the EA and issuance of the Construction Licence"
A construction licence is an official government or municipal permit that authorizes a company to build, expand or alter a physical project, often with specific conditions, inspections and time limits. For investors it matters because the licence controls whether and when a project can proceed, affects costs and timelines, and creates legal risk—similar to needing a permit before starting a major renovation, without which the project can be delayed, fined or stopped.
toll milling agreement financial
"to process the ore from the Cigar Lake mine under a toll milling agreement"
A toll milling agreement is a contract where one company pays a processor to grind, mill or otherwise transform its raw materials into finished or semi‑finished products while the material owner keeps legal title and pays a fee for the service. For investors it matters because it lets a business avoid buying expensive production plants, affecting costs, margins, supply‑chain risk and operational flexibility—like renting a specialized workshop instead of owning it.
joint venture financial
"Denison’s interests in Saskatchewan also include a 22.5% ownership interest in the McClean Lake Joint Venture"
A joint venture is when two or more companies team up to work on a specific project or business idea, sharing both the risks and the rewards. It’s like friends starting a lemonade stand together—each contributes resources and they split the profits, making it easier to succeed than going alone.
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: March 31, 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: March 31,
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 March 30, 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 Filing of Annual Report on Form 40-F
Toronto, ON
– March 30, 2026. Denison Mines Corp. (“Denison” or the
“Company”) (TSX: DML, NYSE American: DNN)
is pleased to announce that it has
filed its 2025 Annual Report on Form 40-F with the U.S. Securities
and Exchange Commission (“SEC”). Denison’s Form
40-F includes its annual information form, management discussion
and analysis, and audited financial statements for the year ended
December 31, 2025. The Form 40-F will be available on
Denison’s website at www.denisonmines.com
and on the SEC’s website
at www.sec.gov/edgar.
Denison’s
annual information form has also been filed with Canadian
regulatory authorities and will be available on Denison’s
website at www.denisonmines.com
and under the Company’s profile on SEDAR+ at www.sedarplus.ca.
Holders of
Denison’s securities may receive a free printed copy of the
Company’s most recent Annual Report on Form 40-F, including
the audited financial statements, by sending an email request to
info@denisonmines.com
or by writing to Denison Mines Corp., 1100 - 40 University Avenue,
Toronto, Ontario, Canada M5J 1T1.
About Denison
Denison is a leading uranium mining, development, and exploration
company with interests focused in the Athabasca Basin region of
northern Saskatchewan, Canada. Denison has an effective 95%
interest in its flagship Wheeler River Uranium Project, which is
the largest undeveloped uranium project in the infrastructure rich
eastern portion of the Athabasca Basin region of northern
Saskatchewan. In mid-2023, the Phoenix feasibility study was
completed for the Phoenix deposit as an ISR mining operation, and
an update to the previously prepared 2018 Pre-Feasibility Study
(“PFS”) was completed for Wheeler River's Gryphon
deposit as a conventional underground mining operation. 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 Phoenix commenced in 2019 and the
required permits have been obtained to commence construction
– including the July 2025 approval of the project’s
Environmental Assessment (“EA”) by the Province of
Saskatchewan and the February 2026 federal approval of the EA and
issuance of the Construction Licence.
Denison’s interests in Saskatchewan also include a 22.5%
ownership interest in the McClean Lake Joint Venture
(“MLJV”), which restarted mining with SABRE in 2025)
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 Main and Midwest A deposits held by the Midwest Joint
Venture (“MWJV”), 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, the Company 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 press 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
‘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’, ‘be
achieved’ or ‘has the potential to’. In
particular, this press release contains forward-looking information
pertaining to the following: Denison’s development plans for
Wheeler River and the proposed ISR operation for the Phoenix
deposit; expectations regarding Denison’s joint venture
ownership interests; and expectations regarding the objectives and
continuity of its agreements with third parties.
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. In addition, Denison
may decide or otherwise be required to discontinue development work
if it is unable to maintain or otherwise secure the necessary
approvals or resources. 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 the
Company’s annual information form for the year ended December
31, 2025 under the heading ‘Risk Factors’. 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 press 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 press release. Denison does not undertake any
obligation to publicly update or revise any forward-looking
information after the date of this press release to conform such
information to actual results or to changes in Denison's
expectations except as otherwise required by applicable
legislation.
FAQ
What did Denison Mines (DNN) announce in this Form 6-K filing?
Denison Mines announced it has filed its 2025 Annual Report on Form 40-F with the SEC. The report includes its annual information form, management discussion and analysis, and audited financial statements for the year ended December 31, 2025.
Where can investors access Denison Mines (DNN) 2025 Form 40-F and annual information form?
Denison’s Form 40-F is available on www.denisonmines.com and the SEC’s www.sec.gov/edgar site. Its annual information form is available on Denison’s website and under the company’s profile on SEDAR+ at www.sedarplus.ca.
How can holders of Denison Mines (DNN) securities request a printed copy of the Form 40-F?
Security holders may receive a free printed copy of the most recent Form 40-F, including audited financial statements, by emailing info@denisonmines.com or writing to Denison Mines Corp., 1100 - 40 University Avenue, Toronto, Ontario, Canada M5J 1T1.
What is Denison Mines’ interest in the Wheeler River uranium project?
Denison holds an effective 95% interest in the Wheeler River Uranium Project in Saskatchewan’s Athabasca Basin. Feasibility and pre-feasibility studies indicate the Phoenix and Gryphon deposits could be competitive with some of the lowest-cost uranium mining operations globally.
What recent permitting milestones has Denison Mines achieved at the Phoenix deposit?
Permitting for Phoenix began in 2019 and the company has obtained required permits to commence construction. These include a July 2025 provincial Environmental Assessment approval and a February 2026 federal Environmental Assessment approval with issuance of a Construction Licence.
What other uranium interests does Denison Mines (DNN) hold in the Athabasca Basin region?
Denison holds 22.5% of the McClean Lake Joint Venture, 25.17% of the Midwest Main and Midwest A deposits, and 70.55% of the THT and Huskie deposits. It also owns 50% of JCU, which holds additional Canadian uranium project interests.