# Denison Mines Corp. (TSX:DML)

> Denison is a leading uranium mining, development, and exploration company with interests focused in the Athabasca Basin region of northern Saskatchewan, Canada.

## About

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. Denison's interests in Saskatchewan also include a 22.5% ownership interest in the McClean Lake Joint Venture ('MLJV'), which includes unmined uranium deposits (planned for extraction via the MLJV's SABRE mining method starting 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 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 ~384,000 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.

## Key facts

- **Mineral resource:** Wheeler River is the largest undeveloped high-grade uranium project in the infrastructure rich eastern portion of the Athabasca Basin region, in northern Saskatchewan - including Proven and Probable Mineral Reserves of 106.4 million pounds U3O8 (Phoenix 219,000 tonnes at 11.7% U3O8 for 56.7 million pounds U3O8; Gryphon 1,257,000 tonnes at 1.8% U3O8 for 49.7 million pounds U3O8). The Midwest Lake project received approval for its Environmental Impact Statement (“EIS”) in 2012, and is host to the Midwest Main and Midwest A uranium deposits. An updated mineral resource estimate was completed in 2018, resulting in an estimate of 50.8M lbs U3O8 in Indicated Mineral Resources (1,019,000 tonnes at 2.26% U3O8) plus 18.2M lbs U3O8 in Inferred Mineral Resources (845,000 tonnes at 0.98% U3O8).
- **Projects:** ["Wheeler River is the largest undeveloped high-grade uranium project in the infrastructure rich eastern portion of the Athabasca Basin region, in northern Saskatchewan - including Proven and Probable Mineral Reserves of 106.4 million pounds U3O8 (Phoenix 219,000 tonnes at 11.7% U3O8 for 56.7 million pounds U3O8; Gryphon 1,257,000 tonnes at 1.8% U3O8 for 49.7 million pounds U3O8).","The Midwest Lake project received approval for its Environmental Impact Statement (“EIS”) in 2012, and is host to the Midwest Main and Midwest A uranium deposits. An updated mineral resource estimate was completed in 2018, resulting in an estimate of 50.8M lbs U3O8 in Indicated Mineral Resources (1,019,000 tonnes at 2.26% U3O8) plus 18.2M lbs U3O8 in Inferred Mineral Resources (845,000 tonnes at 0.98% U3O8).","The McClean Lake project includes several uranium deposits and the McClean Lake uranium mill, which is currently processing ore from the Cigar Lake mine under a toll milling agreement. The McClean Lake mill is licensed to produce up to 24M lbs U3O8 per year and is currently processing for the Cigar Lake mine.","The Waterbury Lake project covers over 40,000 hectares and is host to the Tthe Heldeth Túé and Huskie uranium deposits, both of which are located within 20 kilometres of Denison’s 22.5% owned McClean Lake mill. The project is adjacent to the Roughrider and Midwest projects, which also host high-grade uranium deposits."]
- **Leadership:** David D. Cates (President and Chief Executive Officer, Chartered Professional Accountant (CPA, CA) with extensive expertise in the uranium mining industry. Appointed President & CEO of Denison in 2015, previously served as Vice President, Finance & Tax and Chief Financial Officer.), Elizabeth Sidle (Vice President Finance & Chief Financial Officer, Joined Denison in 2016 and appointed CFO in December 2023. Extensive experience in financial reporting and resource sector.), David Bronkhorst (Interim Vice President Operations, Seasoned mining executive with over 35 years of experience in base metals, gold, and uranium mining.), Geoff Smith (Vice President Corporate Development & Commercial, Extensive experience in capital markets and the mining sector, previously Managing Director at Scotiabank.), Mary Jo Smith (Vice President Human Resources and Administration, Appointed Vice President in 2024 with extensive experience in resource sector management.), Chad Sorba (Vice President Technical Services & Project Evaluation, Professional Geologist with nearly two decades of experience in uranium exploration and evaluation.), Janna Switzer (Vice President Environment, Sustainability & Regulatory, Over two decades of experience in the resource industry, including uranium mining and exploration.), Amanda Willett (Vice President Legal and Corporate Secretary, Joined Denison in 2016 with nearly a decade of experience in securities law and corporate governance.)

_Verified data last updated: 2026-08-14_

## Recent filings

- 2026-08-12 — other — [dml_2026-08-12_18-55-53.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/113961?documentId=113961)
- 2026-08-12 — other — [dml_2026-08-12_18-55-52.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/113962?documentId=113962)
- 2026-08-12 — mda — [dml_2026-08-12_18-53-51.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/113963?documentId=113963)
- 2026-08-12 — financials — [dml_2026-08-12_18-52-20.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/113964?documentId=113964)
- 2026-07-28 — press_release — [dml_2026-07-28_09-39-57.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/101516?documentId=101516)
- 2026-07-15 — other — [dml_2026-07-15_18-10-05.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/101517?documentId=101517)
- 2026-07-09 — other — [dml_2026-07-09_20-07-56.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/101518?documentId=101518)
- 2026-07-02 — press_release — [dml_2026-07-02_10-32-21.pdf](https://ai-chat-dev-red.vercel.app/dml/preview/101519?documentId=101519)

## Live AI chat

- https://ai-chat-dev-red.vercel.app/dml/chat
- Investor website: https://denisonmines.com/