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Provisions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Provisions, beginning $ 195,384 $ 75,155
Revisions in estimates and obligations incurred 40,857 32,909
Acquired from Tahoe (Note 8)   78,052
-new provisions 2,402 2,551
-change in estimate (1,754) (252)
-exchange gains on provisions (569) (265)
Charged in the year (165) (405)
Reclamation expenditures (2,462) (2,264)
Accretion expense (Note 24) 8,260 9,903
Provisions, ending 241,953 195,384
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 188,455 70,587
Revisions in estimates and obligations incurred 40,857 32,909
Acquired from Tahoe (Note 8)   77,320
-new provisions 0 0
-change in estimate 0 0
-exchange gains on provisions 0 0
Charged in the year 0 0
Reclamation expenditures (2,462) (2,264)
Accretion expense (Note 24) 8,260 9,903
Provisions, ending 235,110 188,455
Litigation [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 6,929 4,568
Revisions in estimates and obligations incurred 0 0
Acquired from Tahoe (Note 8)   732
-new provisions 2,402 2,551
-change in estimate (1,754) (252)
-exchange gains on provisions (569) (265)
Charged in the year (165) (405)
Reclamation expenditures 0 0
Accretion expense (Note 24) 0 0
Provisions, ending $ 6,843 $ 6,929