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v3.23.1

Mining interests and plant and equipment (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 CAD ($) | Sep. 30, 2021 CAD ($) $ / Ounce | Jun. 30, 2021 CAD ($) $ / Ounce | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |
Impairment loss |  |  |  | $ 1,818 | $ 2,948
Plant and equipment [Member] |  |  |  |  |
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |
Right-of-use assets |  |  |  | $ 6,800 | $ 20,300
San Antonio gold project [Member] |  |  |  |  |
Mining exploration, evaluation and development and Royalty, Stream and other interest [line items] |  |  |  |  |
Impairment loss | $ 81,000 |  |  |  |
Estimated recoverable amount | $ 35,000 |  |  |  |
Pre-tax real discount rate | 19.90% |  |  |  |
Additional impairment charge if gold price per ounce applied to cash flow projections had been 10% lower | $ 35,000 |  |  |  |
Additional impairment charge if the pre-tax real discount rate had been 100 basis points higher | $ 5,800 |  |  |  |
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 | $ / Ounce |  | 1,787 | 1,797 |  |
Short-term remaining mine life |  | 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 had been 10% lower |  |  | $ 12,400 |  |

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