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1. NATURE OF OPERATIONS | 12 Months Ended
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Dec. 31, 2017
Nature Of Operations |
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, including acquisition, exploration and development of uranium properties, extraction, processing and selling of uranium. The Company has a 63.3% interest in the Wheeler River Joint Venture (“WRJV”), 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 provides toll milling services to the Cigar Lake Joint Venture (“CLJV”) under the terms of a toll milling agreement between the parties (see note 13). 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 decommissioned site monitoring services to third parties through its Denison Environmental Services (“DES”) division and is also the manager of Uranium Participation Corporation (“UPC”), a publicly-listed investment holding 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 “2017” and “2016” refer to the year ended December 31, 2017 and the year ended December 31, 2016 respectively.

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- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_138_b&doctype=Standard -URIDate 2016-03-31 + Details
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