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Long-term debt - Disclosure of detailed information about borrowings (Details) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Borrowings [abstract]      
Convertible debentures $ 300,000 $ 350,000  
Revolving credit facility 113,389 63,659  
Mining equipment financings 3,764 0  
Long-term debt 417,153 413,659  
Unamortized debt issuance costs (2,291) (4,495)  
Unamortized accretion on convertible debentures (4,427) (8,735)  
Long-term debt, net of issuance costs 410,435 400,429  
Current portion 294,891 49,867  
Non-current portion 115,544 350,562  
Long-term debt $ 410,435 $ 400,429 $ 349,042