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INTEREST IN OTHER ENTITIES (Tables)
 12 Months Ended
Dec. 31, 2019
Significant Subsidiaries Associates Joint Operations And Contractual Arrangements Abstract  
Significant subsidiaries, associates and joint operations
      December December Fiscal  
    Place 31, 2019 31, 2018 2019  
    Of Ownership Ownership Participating Accounting
    Business Interest (1) Interest (1) Interest (2) Method
Subsidiaries            
Denison Mines Inc.   Canada 100.00% 100.00% N/A Consolidation
Denison AB Holdings Corp.   Canada 100.00% 100.00% N/A Consolidation
Denison Waterbury Corp   Canada 100.00% 100.00% N/A Consolidation
9373721 Canada Inc.   Canada 100.00% 100.00% N/A Consolidation
Denison Mines (Bermuda) I Ltd   Bermuda 100.00% 100.00% N/A Consolidation
Associates            
GoviEx Uranium Inc.   Africa See Below 16.21% N/A FVTPL/Equity Method
Joint Operations          
Waterbury Lake Uranium Corp   Canada 60.00% 60.00% 100% Voting Share (3)
Waterbury Lake Uranium LP   Canada 66.57% 65.92% 100% Voting Share (3)
Key Contractual Arrangements            
Wheeler River Joint Venture   Canada 90.00% 90.00% 90.00% Denison Share (3)
Midwest Joint Venture   Canada 25.17% 25.17% 25.17% Denison Share (3)
Mann Lake Joint Venture   Canada 30.00% 30.00% N/A (4) Denison Share (3)
Wolly Joint Venture   Canada 21.89% 21.89% N/A (4) Denison Share (3)
McClean Lake Joint Venture   Canada 22.50% 22.50% 22.50% Denison Share (3)