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. In addition to its 90% owned Wheeler River project, which ranks as the largest undeveloped high-grade uranium project in the infrastructure rich eastern portion of the Athabasca Basin region, Denison's Athabasca Basin exploration portfolio consists of numerous projects covering approximately 310,000 hectares.

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Financial Reports

• + 2020 First Quarter Report
• + 2019 Annual Report
• + 2019 Third Quarter Report
• + 2020 AGM Materials
• + 2019 Form 40-F
• + 2019 Annual Information Form