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Mining interests and plant and equipment (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 CAD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 CAD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |  |
Impairment loss |  |  |  |  | $ 124,538 | $ 26,300
Plant and equipment [Member] |  |  |  |  |  |
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |  |
Right-of-use assets |  |  |  |  | $ 20,300 | $ 10,800
Bonanza Ledge Phase 2 Project [Member] |  |  |  |  |  |
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |  |
Impairment loss | $ 22,400 |  | $ 36,100 |  |  |
Estimated recoverable amount |  |  | $ 12,400 |  |  |
Average gold price per ounce |  | $ 1,787 |  | $ 1,797 |  |
Short-term remaining mine life | 18 months | 18 months | 18 months | 18 months |  |
Additional Impairment Charge if gold price per ounce applied to cash flow projections had been 10% lower |  |  | $ 9,300 |  |  |
Additional impairment charge if the average gold grade or gold recovery applied to the cash flows had been 10% lower |  |  | $ 12,400 |  |  |

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