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Contract liability - Movement of contract liability (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Contract liability    
Balance - Beginning of year $ 55,193 $ 24,820
Deposits   26,112
Proceeds from contract liability (1,326) (2,792)
Accretion on the contract liability's financing component 9,302 7,377
Cumulative catch-up adjustment (34,581) (4,362)
Currency translation adjustment 3,133 4,038
Balance - End of year 31,721 55,193
Current liabilities 21 941
Non-current liabilities 31,700 54,252
Contract liability 31,721 $ 55,193
Decrease in expected production for certain of the mining sites resulted in a catch-up adjustment $ 33,600