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RESTRICTED CASH AND INVESTMENTS (Details) $ in Thousands | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Statement [Line Items] |  |  |  |
Restricted cash and investments-by item |  | $ 12,001 |  | $ 12,018
Restricted cash and investments | $ 12,001 |  | $ 12,018 |
Investments |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments |  | 9,135,000 | 9,135 |
Cash and Cash Equivalents |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments |  | 2,866,000 | 2,883 |
Elliot Lake Reclamation Trust Fund |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments | 2,866 | 2,866,000 | 2,883 |
Letters of Credit Facility Pledged Assets |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments |  | 9,000,000 | 9,000 |
Letters of Credit Additional Collateral |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments |  | 135,000 | 135 |
Denison Mines Inc. |  |  |  |
Statement [Line Items] |  |  |  |
Restricted cash and investments | $ 12,001 | $ 12,001,000 | $ 12,018 |

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