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INTEREST IN OTHER ENTITIES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Waterbury Lake Uranium Corp |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Ownership interest, joint operations | 60.00% | 60.00%
Participating interest | 100.00% |
Accounting method | Voting Share |
Waterbury Lake Uranium LP |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, joint operations | Canada |
Ownership interest, joint operations | 66.90% | 66.57%
Participating interest | 100.00% |
Accounting method | Voting Share |
Wheeler River Joint Venture |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, key contractual arrangements | Canada |
Ownership interest, key contractual arrangements | 90.00% | 90.00%
Participating interest | 90.00% |
Accounting method | Denison Share |
Midwest Joint Venture |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, key contractual arrangements | Canada |
Ownership interest, key contractual arrangements | 25.17% | 25.17%
Participating interest | 25.17% |
Accounting method | Denison Share |
Mann Lake Joint Venture |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, key contractual arrangements | Canada |
Ownership interest, key contractual arrangements | 30.00% | 30.00%
Participating interest | 0.00% |
Accounting method | Denison Share |
Wolly Joint Venture |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, key contractual arrangements | Canada |
Ownership interest, key contractual arrangements | 21.89% | 21.89%
Participating interest | 0.00% |
Accounting method | Denison Share |
McClean Lake Joint Venture |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, key contractual arrangements | Canada |
Ownership interest, key contractual arrangements | 22.50% | 22.50%
Participating interest | 22.50% |
Accounting method | Denison Share |
Denison Mines Inc. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | 100.00%
Accounting method | Consolidation |
Denison AB Holdings Corp. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | 100.00%
Accounting method | Consolidation |
Denison Waterbury Corp |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | 100.00%
Accounting method | Consolidation |
9373721 Canada Inc. |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Canada |
Ownership interest, subsidiaries | 100.00% | 100.00%
Accounting method | Consolidation |
Denison Mines (Bermuda) I Ltd |  |
DisclosureOfSignificantInvestmentsInSubsidiariesAssociatesJointOperationAndContractualArrangementsLineItems [Line Items] |  |
Place of business, subsidiaries | Bermuda |
Ownership interest, subsidiaries | 100.00% | 100.00%
Accounting method | Consolidation |

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