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OTHER FINANCIAL ASSETS (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Dec. 31, 2018
Disclosure of financial assets [line items] |  |  |  |
Net cash unrestricted | $ 85,110 | $ 53,198 |  | $ 45,665
Net proceeds from the sale securities | 7,270 |  |  |
Marketable securities [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Net proceeds from the sale securities | 7,270 |  |  |
Gibraltar Joint Venture [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Net cash unrestricted | $ 46,440 | $ 54,454 |  |
Gibraltar Joint Venture [Member] | Reclamation Deposits [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Net cash unrestricted |  |  | $ 6,200 |
Reclamation Deposits |  |  | 30,000 |
Gibraltar Joint Venture [Member] | Surety Bonds [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Letter of credit issued |  |  | 50,000 |
Canadian Chartered Bank [Member] | Surety Bonds [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Collateralized bond amount |  |  | 37,500 |
Letter of credit issued |  |  | 50,000 |
Cariboo [Member] | Surety Bonds [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Letter of credit issued |  |  | 12,500 |
Florence copper project [Member] | Reclamation Deposits [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Cash collateral reclamation of deposits |  |  | 2,103 |
Florence copper project [Member] | Surety Bonds [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Collateralized bond amount |  |  | $ 12,489 |

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