Diversified Athabasca Basin Asset Base with Superior Development Leverage

STRATEGIC PROJECT PORTFOLIO:

• 90% interest in flagship Wheeler River project – largest undeveloped uranium project in infrastructure rich eastern Athabasca Basin
• 22.5% interest in operating McClean Lake Uranium Mill – 6M lbs U₃O₈ excess licensed capacity, +12% of global uranium production
• Interests in NI 43-101 uranium mineral resources at McClean Lake, Midwest, and Waterbury Lake
• ~280,000 hectares of prospective exploration ground in the Athabasca Basin
• Internal sources of cash flow from management of Uranium Participation Corp. (TSX-U), and Denison's Closed Mines Services

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Denison Mines Corp.

Denison is a uranium exploration and development company with interests focused in the Athabasca Basin region of northern Saskatchewan, Canada. The Company's flagship project is the 90% owned 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. Denison's interests in Saskatchewan also include a 22.5% ownership interest in the McClean Lake joint venture ("MLJV"), which includes several uranium deposits and the McClean Lake uranium mill, contracted to process the ore from the Cigar Lake mine under a toll milling agreement, plus a 25.17% interest in the Midwest and Midwest A deposits, and a 66.90% interest in the Tthe Heldeth Túé ("THT," formerly J Zone) and Huskie deposits on the Waterbury Lake property. Each of Midwest, Midwest A, THT and Huskie are located within 20 kilometres of the McClean Lake mill.

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Financial Reports

• + 2021 First Quarter Report
• + 2020 Annual Report
• + 2020 Third Quarter Report
• + 2021 AGM Materials
• + 2020 Form 40-F
• + 2020 Annual Information Form