If You Invested in Denison Mines (DNN)

Denison Mines Corp (NYSE American: DNN; TSX: DML) is a uranium mining, development, and exploration company with interests focused in the Athabasca Basin region of northern Saskatchewan, Canada. The company is active in the uranium-radium-vanadium ore mining industry and the broader mining, quarrying, and oil and gas extraction sector. Denison reports that it has an effective 95% interest in its flagship Wheeler River Uranium Project, described as the largest undeveloped uranium project in the infrastructure-rich eastern portion of the Athabasca Basin.

Core business and flagship Wheeler River Project

Denison’s core business centers on advancing and operating uranium projects. The company highlights Wheeler River as its primary asset, hosting the high-grade Phoenix and Gryphon uranium deposits, which were discovered by Denison in 2008 and 2014, respectively. A feasibility study was completed for the Phoenix deposit as an in-situ recovery (ISR) uranium mining operation, and an updated pre-feasibility study was completed for the Gryphon deposit as a conventional underground mining operation. According to Denison, based on these 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. Denison reports that these efforts are nearing completion, with provincial approval of the project’s Environmental Assessment and Canadian Nuclear Safety Commission hearings held for federal approval of the Environmental Assessment and a project construction licence. The company has also described Phoenix as being in a construction-ready state, with detailed engineering substantially complete and key long-lead items for site electrification and infrastructure procured.

Mining, development, and exploration activities

Beyond Wheeler River, Denison is involved in uranium mining, development, and exploration across a portfolio of interests in the Athabasca Basin. The company notes that it operates in mining and corporate segments and that the majority of its revenue is generated from its mining-related activities. Denison also has a history in mine decommissioning and environmental services through its Closed Mines group, which manages reclamation projects at Elliot Lake and provides post-closure mine care and maintenance services to third parties.

Denison reports direct ownership interests in properties covering hundreds of thousands of hectares in the Athabasca Basin region. These include majority and minority interests in various deposits and projects that support both near-term development and longer-term exploration potential.

Key interests and joint ventures in Saskatchewan

Denison’s Saskatchewan interests include a 22.5% ownership interest in the McClean Lake Joint Venture (MLJV). The MLJV includes unmined uranium deposits and the McClean Lake uranium mill, which Denison states is utilizing a portion of its licensed capacity to process ore from the Cigar Lake mine under a toll milling agreement. Mining at the McClean North deposit via the MLJV’s patented Surface Access Borehole Resource Extraction (SABRE) mining method commenced in 2025, with Denison highlighting initial production from this operation.

The company also reports a 25.17% interest in the Midwest Joint Venture, which includes the 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. Denison notes that the Midwest Main, Midwest A, THT, and Huskie deposits are located within approximately 20 kilometres of the McClean Lake mill, underscoring the strategic link between these deposits and existing processing infrastructure.

Additional project interests through JCU and other partnerships

Through its 50% ownership of JCU (Canada) Exploration Company, Limited, Denison holds additional interests in uranium project joint ventures in Canada. These include the Millennium project (JCU, 30.099%), the Kiggavik project (JCU, 33.8118%), and the Christie Lake project (JCU, 34.4508%). Denison also reports joint venture and earn-in arrangements around the Wheeler River area and adjacent exploration properties, such as joint ventures formed over Skyharbour Resources Ltd.’s Russell Lake Uranium Project claims, including Wheeler North, Russell Lake (RL), Wheeler River Inliers, and Getty East.

These arrangements are described by Denison as part of a strategy to increase its strategic foothold surrounding Wheeler River and to collaborate with partners on evaluating highly prospective exploration ground proximal to its flagship project.

History and corporate background

Denison Mines Corp. is formed under the laws of Ontario and is a reporting issuer in all Canadian provinces and territories. Its common shares trade on the Toronto Stock Exchange under the symbol DML and on the NYSE American exchange under the symbol DNN. Denison has stated that it celebrated its 70th year in uranium mining, exploration, and development in 2024, tracing its origins back to 1954 with the acquisition of mining claims in the Elliot Lake region of northern Ontario.

Over its history, Denison has evolved from early uranium mining in Ontario to a focus on high-grade uranium deposits in northern Saskatchewan. The company’s long operating history, combined with its current portfolio of development and exploration projects, positions it as an established participant in the Athabasca Basin uranium sector.

Community, Indigenous, and regional agreements

Denison reports that it has entered into several agreements with Indigenous and northern communities related to its projects in northern Saskatchewan. These include an Impact Benefit Agreement with Métis Nation–Saskatchewan, various Métis Locals, and regional organizations, providing consent and support for the development and operation of the Wheeler River Project and covering exploration and evaluation activities within certain Métis regions.

The company has also announced the Nuhenéné Benefit Agreement with three First Nations and four northern municipalities, together with the Ya'thi Néné Land and Resource Office. This regional mutual benefits agreement provides consent and support for the development and operation of Denison’s majority owned and operated Wheeler River and Waterbury Lake projects, as well as its interests in the Midwest and McClean Lake projects. Denison describes these agreements as frameworks for long-term cooperative relationships that address environmental oversight, benefit sharing, employment and training opportunities, and community investment.

Power infrastructure and project readiness at Phoenix

Denison has highlighted the availability of grid power at the site of the future Phoenix ISR uranium mine as a significant project milestone. A new 138kV transmission line was installed by Saskatchewan Power Corporation (SaskPower) to connect the Phoenix site to the existing provincial grid. Denison notes that this connection supports the electrification of the site, which is on the critical path for the first year of construction and for establishing the planned freeze wall around the initial mining area.

The company states that Phoenix has been designed to be powered by electricity from the SaskPower grid, and that access to grid electricity is considered a competitive advantage compared to on-site power generation. Long-lead electrical distribution infrastructure, including a main site transformer, substation high-voltage equipment, switchgear, and a substation e-house, has been procured for installation during the first year of construction, subject to final regulatory approvals and a final investment decision.

Capital planning and financing

Denison has reported that it prepared an updated initial capital cost estimate for the Phoenix project based on substantial completion of project engineering and significant procurement activities. The company describes this as a Class 2 post-final investment decision capital cost estimate, intended to serve as a construction cost control budget. Denison has also completed an offering of convertible senior unsecured notes, with stated plans to use the net proceeds to support evaluation and development of its uranium projects, including funding construction of the planned Phoenix ISR operation and for general corporate purposes.

Regulatory filings and reporting

As a foreign private issuer in the United States, Denison files reports on Form 40-F and current reports on Form 6-K under the Securities Exchange Act of 1934. Recent 6-K filings have included press releases related to project milestones, community agreements, financial and operational results, and technical reports. The company also files technical reports and other disclosure documents on Canadian regulatory platforms such as SEDAR+.

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