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EXPLORATION AND EVALUATION ASSETS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Capital expenditures for exploration and evaluation assets |  |  | $ 1.9 | $ 0.6
Exploration and evaluation assets |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Additions |  |  | 5.0 | 12.6
Fayolle property | Exploration and evaluation assets |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Acquisition of exploration and evaluation assets, equity component |  |  | 6.7 |
Additions |  | $ 0.6 | 0.0 | $ 7.3
Fayolle property | Exploration and evaluation assets | Common shares |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Issuance of shares for Exploration and evaluation asset acquisition (in shares) |  |  |  | 1,851,145
Monster Lake project | Exploration and evaluation assets |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Acquisition of exploration and evaluation assets, equity component | $ 4.9 |  |  |
Additions | 5.3 |  | $ 0.0 | $ 5.3
Capital expenditures for exploration and evaluation assets | $ 0.4 |  |  |
Monster Lake project | Exploration and evaluation assets | Common shares |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Issuance of shares for Exploration and evaluation asset acquisition (in shares) | 1,464,377 |  |  |
Project ownership percentage |  |  | 25.00% |

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