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Provisions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
Provisions, beginning $ 241,953 $ 195,384
Revisions in estimates and obligations incurred 6,278 40,857
-new provisions 6,376 2,402
-change in estimate (1,801) (1,754)
-exchange gains on provisions (389) (569)
-utilized in the period (5,738) (165)
Reclamation expenditures (5,997) (2,462)
Accretion expense (Note 22) 7,470 8,260
Provisions, ending 248,152 241,953
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 235,110 188,455
Revisions in estimates and obligations incurred 6,278 40,857
-new provisions 0 0
-change in estimate 0 0
-exchange gains on provisions 0 0
-utilized in the period 0 0
Reclamation expenditures (5,997) (2,462)
Accretion expense (Note 22) 7,470 8,260
Provisions, ending 242,861 235,110
Litigation [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 6,843 6,929
Revisions in estimates and obligations incurred 0 0
-new provisions 6,376 2,402
-change in estimate (1,801) (1,754)
-exchange gains on provisions (389) (569)
-utilized in the period (5,738) (165)
Reclamation expenditures 0 0
Accretion expense (Note 22) 0 0
Provisions, ending $ 5,291 $ 6,843