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Supplemental cash flow information (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Changes in non-cash working capital |  |
Accounts receivable | $ 143,717 | $ 58,488
Inventories | (376,908) | 113,388
Supplies and prepaid expenses | (3,999) | 3,612
Accounts payable and accrued liabilities | 36,514 | (53,477)
Reclamation payments | (17,640) | (32,390)
Other | 25,399 | 6,857
Total | $ (192,917) | $ 96,478

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