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Share capital - Summary of share capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Number of Shares    
Shares issued upon exercise of share options (in shares) 987,649 885,750
Shares issued on redemption of performance share units (in shares) 0 528,166
Estimated fair value of share options exercised transferred from contributed surplus (in shares) 0 0
Shares issued upon exercise of warrants (in shares) 0 19,037
Shares issued for private placement with EBRD, net of issuance costs (in shares) 6,269,231 0
Shares issued for bought deal offering, net of issuance costs (in shares) 10,400,000 0
Flow-through and other shares issued, net of issuance costs and premium (in shares) 680,900 694,500
Total    
Balance beginning of year $ 3,200,868  
Shares issued for private placement with EBRD, net of issuance costs 59,873 $ 0
Shares issued for bought deal offering, net of issuance costs 94,718 0
Balance end of year $ 3,511,965 $ 3,200,868
Voting common shares    
Number of Shares    
Beginning balance (in shares) 184,800,571 182,673,118
Ending balance (in shares) 203,138,351 184,800,571
Share capital    
Total    
Balance beginning of year $ 3,241,644 $ 3,225,326
Shares issued upon exercise of share options 7,390 4,438
Shares issued on redemption of performance share units 0 2,256
Estimated fair value of share options exercised transferred from contributed surplus 3,112 1,787
Shares issued upon exercise of warrants 0 213
Flow-through shares issued, net of issuance costs and premium 6,628 7,624
Balance end of year $ 3,413,365 $ 3,241,644