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INTEREST IN OTHER ENTITIES (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Waterbury Lake Uranium Corp    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, joint operations Canada  
Ownership interest, joint operations [1] 60.00% 60.00%
Participating interest [2] 100.00%  
Accounting method [3] Voting Share  
Waterbury Lake Uranium LP    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, joint operations Canada  
Ownership interest, joint operations [1] 66.57% 65.92%
Participating interest [2] 100.00%  
Accounting method [3] Voting Share  
Wheeler River Joint Venture    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, key contractual arrangements Canada  
Ownership interest, key contractual arrangements [1] 90.00% 90.00%
Participating interest [2] 90.00%  
Accounting method [3] Denison Share  
MidwestJointVenture    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, key contractual arrangements Canada  
Ownership interest, key contractual arrangements [1] 25.17% 25.17%
Participating interest [2] 25.17%  
Accounting method [3] Denison Share  
Mann Lake Joint Venture    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, key contractual arrangements Canada  
Ownership interest, key contractual arrangements [1] 30.00% 30.00%
Participating interest [4] 0.00%  
Accounting method [3] Denison Share  
Wolly Joint Venture    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, key contractual arrangements Canada  
Ownership interest, key contractual arrangements [1] 21.89% 21.89%
Participating interest [4] 0.00%  
Accounting method [3] Denison Share  
McClean Lake Joint Venture    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, key contractual arrangements Canada  
Ownership interest, key contractual arrangements [1] 22.50% 22.50%
Participating interest 22.50%  
Accounting method [3] Denison Share  
GoviEx Uranium Inc.    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, associates Africa  
Ownership interest, associates [1]   16.21%
Accounting method FVTPL/Equity Method  
Denison Mines Inc.    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, subsidiaries Canada  
Ownership interest, subsidiaries [1] 100.00% 100.00%
Accounting method Consolidation  
Denison AB Holdings Corp.    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, subsidiaries Canada  
Ownership interest, subsidiaries [1] 100.00% 100.00%
Accounting method Consolidation  
Denison Waterbury Corp    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, subsidiaries Canada  
Ownership interest, subsidiaries [1] 100.00% 100.00%
Accounting method Consolidation  
9373721 Canada Inc.    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, subsidiaries Canada  
Ownership interest, subsidiaries [1] 100.00% 100.00%
Accounting method Consolidation  
Denison Mines (Bermuda) I Ltd    
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items]    
Place of business, subsidiaries Bermuda  
Ownership interest, subsidiaries [1] 100.00% 100.00%
Accounting method Consolidation  
[1] (1) Ownership Interest represents Denisons percentage equity / voting interest in the entity or contractual arrangement;
[2] (2) Participating interest represents Denisons percentage funding contribution to the particular joint operation or contractual arrangement. This percentage can differ from ownership interest in instances where other parties to the arrangement have carried interests, they are earning-in to the arrangement, or they are diluting their interest in the arrangement (provided the arrangement has dilution provisions therein)
[3] (3) Denison Share is where Denison accounts for its share of assets, liabilities, revenues and expenses in accordance with the specific terms within the contractual arrangement. this can be by using either its ownership interest (i.e. Voting Share) or its participating interest (i.e. Funding Share), depending on the arrangement terms. The Voting Share and Funding Share approaches produce the same accounting result when the Companys ownership interest and participating interests are equal
[4] (4) The participating interest for 2019 for these arrangements is shown as Not Applicable as there were no approved spending programs carried out during fiscal 2019.