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v3.25.1

Interest in Other Entities (Details) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2023 | Oct. 30, 2023 | Oct. 31, 2024 | Oct. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Percentage of mineral property assets |  |  |  |  | 90.80% |
Waterbury Lake Uranium Corp |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 100.00% |
Place Of Business, Joint Operations |  |  |  |  | Canada |
Ownership interest, Joint Operations |  |  |  |  | 60.00% | 60.00%
Waterbury Lake Uranium LP |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 100.00% |
Place Of Business, Joint Operations |  |  |  |  | Canada |
Ownership interest, Joint Operations |  |  |  |  | 70.32% | 69.35%
Voting interest percentage |  |  |  |  | 75.00% |
Wheeler River Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 91.86% |
Place Of Business, Key Contractual Arrangements |  |  |  |  | Canada |
Ownership Interest, in Key Contractual Arrangements |  |  |  |  | 90.00% | 90.00%
Midwest Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 25.17% |
Place Of Business, Key Contractual Arrangements |  |  |  |  | Canada |
Ownership Interest, in Key Contractual Arrangements |  |  |  |  | 25.17% | 25.17%
Mann Lake Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Key Contractual Arrangements |  |  |  |  | Canada |
Ownership Interest, in Key Contractual Arrangements |  |  |  |  | 30.00% | 30.00%
Wolly Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 20.77% |
Place Of Business, Key Contractual Arrangements |  |  |  |  | Canada |
Ownership Interest, in Key Contractual Arrangements |  |  |  |  | 20.77% | 20.77%
McClean Lake Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 22.50% |
Place Of Business, Key Contractual Arrangements |  |  |  |  | Canada |
Ownership Interest, in Key Contractual Arrangements |  |  |  |  | 22.50% | 22.50%
Denison Mines Inc. |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Subsidiaries |  |  |  |  | Canada |
Ownership interest, Subsidiaries |  |  |  |  | 100.00% | 100.00%
Denison AB Holdings Corp. |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Subsidiaries |  |  |  |  | Canada |
Ownership interest, Subsidiaries |  |  |  |  | 100.00% | 100.00%
Denison Waterbury Corp |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Subsidiaries |  |  |  |  | Canada |
Ownership interest, Subsidiaries |  |  |  |  | 100.00% | 100.00%
Ownership interest, Joint Operations | 69.35% | 67.41% | 70.32% | 69.35% | 60.00% |
9373721 Canada Inc. |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Subsidiaries |  |  |  |  | Canada |
Ownership interest, Subsidiaries |  |  |  |  | 100.00% | 100.00%
Denison Mines (Bermuda) I Ltd |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Place Of Business, Subsidiaries |  |  |  |  | Bermuda |
Ownership interest, Subsidiaries |  |  |  |  | 100.00% | 100.00%
JCU |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Participating Interest |  |  |  |  | 50.00% |
Place Of Business, Joint Operations |  |  |  |  | Canada |
Ownership interest, Joint Operations |  |  |  |  | 50.00% | 50.00%
JCU | Wheeler River Joint Venture |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |
Additional Ownership Interest In Joint venture |  |  |  |  | 5.00% |

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