NATURE OF OPERATIONS	12 Months Ended
Dec. 31, 2022
NATURE OF OPERATIONS
NATURE OF OPERATIONS	1.NATURE OF OPERATIONS Denison Mines Corp. (“DMC”) and its subsidiary companies and joint arrangements (collectively, “Denison” or the “Company”) are engaged in uranium mining related activities, which can include acquisition, exploration, and development of uranium bearing properties, extraction, processing and selling of, and investing in uranium. The Company has an effective 95.0% interest in the Wheeler River Joint Venture (“WRJV”), a 67.41% interest in the Waterbury Lake Uranium Limited Partnership (“WLULP”), a 22.5% interest in the McClean Lake Joint Venture (“MLJV”) (which includes the McClean Lake mill) and a 25.17% interest in the Midwest Joint Venture (“MWJV”), each of which are located in the eastern portion of the Athabasca Basin region in northern Saskatchewan, Canada (see note 26). The McClean Lake mill is contracted to provide toll milling services to the Cigar Lake Joint Venture (“CLJV”) under the terms of a toll milling agreement between the parties (see note 12). In addition, the Company has varying ownership interests in several other development and exploration projects located in Saskatchewan, Canada. Through its 50% ownership of JCU (Canada) Exploration Company, Limited (“JCU”), Denison holds further indirect interests in various uranium project joint ventures in Canada, including the Millennium project (JCU 30.099%), the Kiggavik project (JCU 33.8118%) and the Christie Lake project (JCU 34.4508%). See note 8 for details. Denison is also engaged in post-closure mine care and maintenance services through its Closed Mines group, which manages Denison’s Elliot Lake reclamation projects and provides related services to certain third-party projects. DMC is incorporated under the Business Corporations Act (Ontario) and domiciled in Canada. The address of its registered head office is 40 University Avenue, Suite 1100, Toronto, Ontario, Canada, M5J 1T1. References to “2022” and “2021” refer to the year ended December 31, 2022, and the year ended December 31, 2021 respectively.

NATURE OF OPERATIONS

12 Months Ended

Dec. 31, 2022

1.NATURE OF OPERATIONS

Denison Mines Corp. (“DMC”) and its subsidiary companies and joint arrangements (collectively, “Denison” or the “Company”) are engaged in uranium mining related activities, which can include acquisition, exploration, and development of uranium bearing properties, extraction, processing and selling of, and investing in uranium.

The Company has an effective 95.0% interest in the Wheeler River Joint Venture (“WRJV”), a 67.41% interest in the Waterbury Lake Uranium Limited Partnership (“WLULP”), a 22.5% interest in the McClean Lake Joint Venture (“MLJV”) (which includes the McClean Lake mill) and a 25.17% interest in the Midwest Joint Venture (“MWJV”), each of which are located in the eastern portion of the Athabasca Basin region in northern Saskatchewan, Canada (see note 26). The McClean Lake mill is contracted to provide toll milling services to the Cigar Lake Joint Venture (“CLJV”) under the terms of a toll milling agreement between the parties (see note 12). In addition, the Company has varying ownership interests in several other development and exploration projects located in Saskatchewan, Canada.

Through its 50% ownership of JCU (Canada) Exploration Company, Limited (“JCU”), Denison holds further indirect interests in various uranium project joint ventures in Canada, including the Millennium project (JCU 30.099%), the Kiggavik project (JCU 33.8118%) and the Christie Lake project (JCU 34.4508%). See note 8 for details.

Denison is also engaged in post-closure mine care and maintenance services through its Closed Mines group, which manages Denison’s Elliot Lake reclamation projects and provides related services to certain third-party projects.

DMC is incorporated under the Business Corporations Act (Ontario) and domiciled in Canada. The address of its registered head office is 40 University Avenue, Suite 1100, Toronto, Ontario, Canada, M5J 1T1.

References to “2022” and “2021” refer to the year ended December 31, 2022, and the year ended December 31, 2021 respectively.