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INTEREST IN OTHER ENTITIES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Statement [Line Items] |  |
Additional Interest rate | 75.00% |
Wheeler River Project |  |
Statement [Line Items] |  |
Participating interest | 90.00% |
Place of business, key contractual arrangements | Canada |
Additional Interest rate | 90.00% | 90.00%
Waterbury Lake Uranium Corp |  |
Statement [Line Items] |  |
Participating interest | 100.00% |
Place of business, joint operations | Canada |
Ownership interest, joint operations | 60.00% | 60.00%
Waterbury Lake Uranium LP |  |
Statement [Line Items] |  |
Participating interest | 100.00% |
Place of business, joint operations | Canada |
Ownership interest, joint operations | 66.90% | 66.90%
Midwest Joint Venture |  |
Statement [Line Items] |  |
Participating interest | 25.17% |
Place of business, key contractual arrangements | Canada |
Additional Interest rate | 25.17% | 25.17%
Mann Lake Joint Venture |  |
Statement [Line Items] |  |
Participating interest | 0.00% |
Place of business, key contractual arrangements | Canada |
Additional Interest rate | 30.00% | 30.00%
Wolly Joint Venture |  |
Statement [Line Items] |  |
Participating interest | 0.00% |
Place of business, key contractual arrangements | Canada |
Additional Interest rate | 21.32% | 21.89%
McClean Lake Joint Venture |  |
Statement [Line Items] |  |
Participating interest | 22.50% |
Place of business, key contractual arrangements | Canada |
Additional Interest rate | 22.50% | 22.50%
Denison Mines Inc. |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Canada |
Owneship interest, subsidiaries | 100.00% | 100.00%
Denison AB Holdings Corp. |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Canada |
Owneship interest, subsidiaries | 100.00% | 100.00%
Denison Waterbury Corp |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Canada |
Owneship interest, subsidiaries | 100.00% | 100.00%
9373721 Canada Inc. |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Canada |
Owneship interest, subsidiaries | 100.00% | 100.00%
Denison Mines (Bermuda) I Ltd |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Bermuda |
Owneship interest, subsidiaries | 100.00% | 100.00%
Joint Venture |  |
Statement [Line Items] |  |
Place of business, subsidiaries | Canada |
Owneship interest, subsidiaries | 50.00% | 0.00%
Participating interest | 50.00% |

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