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SUBSEQUENT EVENT (Narrative) (Details) - Subsequent event [Member] $ in Millions, $ in Millions | Jan. 01, 2021 CAD ($) | Jan. 01, 2021 USD ($)
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Senior Secured Notes [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Notes issued |  | $ 400
Maturity date | February 15, 2026 | February 15, 2026
Interest rate |  | 7.00%
Senior Secured Notes due on June 15, 2022 [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Maturity date | June 15, 2022 | June 15, 2022
Interest rate |  | 8.75%
Proceeds from borrowings used to redeem outstanding of 8.75% Senior Secured Notes |  | $ 250
Florence Copper project and Gibraltar mine [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Remaining net proceeds from borrowings available for capital expenditure | $ 167 | $ 131

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