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Discontinued operations - Gain on Disposition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 27, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash   $ 481,327 $ 279,735 $ 451,962
Accounts receivable and other   68,745 91,113  
Property, plant and equipment   4,003,211 3,596,262 4,042,199
Inventories   178,163 198,872  
Assets held for sale   4,930,734 4,457,916  
Accounts payable and accrued liabilities   (195,334) (191,705)  
Asset retirement obligations   (135,455) (109,873) $ (111,378)
Liabilities associated with assets held for sale   0 (10,479)  
Certej Project | Disposal group held for sale        
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash     356  
Accounts receivable and other     1,150  
Property, plant and equipment     24,731  
Inventories     1,501  
Assets held for sale     27,738  
Accounts payable and accrued liabilities     (168)  
Asset retirement obligations     (10,311)  
Liabilities associated with assets held for sale     $ (10,479)  
Tocantinzinho        
Net proceeds:        
Cash received $ 20,000      
Tocantinzinho | Discontinued operations        
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash   340    
Accounts receivable and other   1,101    
Property, plant and equipment   47,466    
Accounts payable and accrued liabilities   (331)    
Capital lease obligations   (92)    
Net assets sold   48,484    
Net proceeds:        
Cash received   20,000    
Shares received   33,036    
Disposal costs incurred   (1,279)    
Working capital changes   59    
Net proceeds   51,816    
Gain on disposition of mine   $ 3,332