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NATURE OF OPERATIONS (Details) | Sep. 16, 2020 shares | Sep. 15, 2020 | Dec. 31, 2020 segment
--- | --- | --- | ---
Nature Of Operations [Abstract] |  |  |
Number of operating segments (in segments) | segment |  |  | 4
Disclosure of detailed information about business combination [line items] |  |  |
Proportion of ownership interest in subsidiary |  | 57.00% |
Anagold |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Proportion of ownership interests held by non-controlling interests | 20.00% |  |
Alacer |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Exchange ratio related to a business acquisition | 0.3246 |  |
Proportion of ownership interest in subsidiary |  | 43.00% |
Alacer | Common shares |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Common shares issued in acquisition (in shares) | shares | 95,699,911 |  |
Alacer | Copler | Anagold |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Proportion of ownership interest in subsidiary | 80.00% |  |

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