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Share capital - Summary of share capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of Shares    
Shares issued upon exercise of share options, for cash (in shares) 339,540 618,915
Shares issued on redemption of PSU's (in shares) 514,010  
Shares issued on acquisition of QMX (in shares) 5,788,187  
Shares issued to the public (in shares)   8,353,042
Flow-through shares issued, net of costs and premium (in shares) 1,100,000 996,100
Total    
Balance beginning of year $ 3,687,045  
Balance end of year $ 3,639,922 $ 3,687,045
Voting common shares    
Number of Shares    
Beginning balance (in shares) 174,931,381 164,963,324
Ending balance (in shares) 182,673,118 174,931,381
Share capital    
Total    
Balance beginning of year $ 3,144,644 $ 3,054,563
Shares issued upon exercise of share options, for cash 1,738 3,559
Shares issued on redemption of PSU's 1,202 0
Estimated fair value of share options exercised transferred from contributed surplus 684 1,267
Shares issued on acquisition of QMX 65,647 0
Shares issued to the public   76,957
Share issuance cost   (1,570)
Flow-through shares issued, net of costs and premium 11,411 9,868
Balance end of year $ 3,225,326 $ 3,144,644