NATURE OF OPERATIONS	12 Months Ended
Dec. 31, 2020
Nature Of Operations
NATURE OF OPERATIONS	Denison Mines Corp. (“DMC”) and its subsidiary companies and joint operations (collectively, “Denison” or the “Company”) are engaged in uranium mining related activities, which can include acquisition, exploration and development of uranium properties, as well as the extraction, processing and selling of uranium. The Company has a 90.0% interest in the Wheeler River Joint Venture (“WRJV”), a 66.90% 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. 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 11). In addition, the Company has varying ownership interests in a number of other development and exploration projects located in Canada. The Company provides mine decommissioning and other services (collectively “environmental services”) to third parties through its Denison Closed Mines Group (formerly Denison Environmental Services) and is also the manager of Uranium Participation Corporation (“UPC”), a publicly-listed company formed to invest substantially all of its assets in uranium oxide concentrates (“U3O8“) and uranium hexafluoride (“UF6”). The Company has no ownership interest in UPC but receives fees for management services and commissions from the purchase and sale of U3O8 and UF6 by UPC. 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 “2020” and “2019” refer to the year ended December 31, 2020 and the year ended December 31, 2019 respectively.

NATURE OF OPERATIONS

12 Months Ended

Dec. 31, 2020

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

The Company has a 90.0% interest in the Wheeler River Joint Venture (“WRJV”), a 66.90% 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. 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 11). In addition, the Company has varying ownership interests in a number of other development and exploration projects located in Canada.

The Company provides mine decommissioning and other services (collectively “environmental services”) to third parties through its Denison Closed Mines Group (formerly Denison Environmental Services) and is also the manager of Uranium Participation Corporation (“UPC”), a publicly-listed company formed to invest substantially all of its assets in uranium oxide concentrates (“U3O8“) and uranium hexafluoride (“UF6”). The Company has no ownership interest in UPC but receives fees for management services and commissions from the purchase and sale of U3O8 and UF6 by UPC.

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 “2020” and “2019” refer to the year ended December 31, 2020 and the year ended December 31, 2019 respectively.