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Long-term debt - Disclosure of detailed information about borrowings (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Borrowings [abstract]      
Convertible debentures $ 0 $ 300,000  
Revolving credit facility 150,000 113,389  
Mining equipment financings 0 3,764  
Long-term debt 150,000 417,153  
Unamortized discount on banker's acceptances (2,050) 0  
Unamortized debt issuance costs 0 (2,291)  
Unamortized accretion on convertible debentures 0 (4,427)  
Long-term debt, net of issuance costs (2,050) 410,435  
Current portion 0 294,891  
Non-current portion 147,950 115,544  
Long-term debt $ 147,950 $ 410,435 $ 400,429