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Provisions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]    
Provisions, beginning $ 59,943 $ 54,871
Revisions in estimates and obligations incurred 12,561 6,875
-new provisions 767 347
-change in estimate (228) (104)
-exchange gains on provisions 93 (32)
Charged in the year (867) (297)
Reclamation expenditures (8,749) (6,080)
Accretion expense (Note 23) 5,973 4,363
Provisions, ending 69,493 59,943
Contingent liability for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 55,611 50,453
Revisions in estimates and obligations incurred 12,561 6,875
-new provisions 0 0
-change in estimate 0 0
-exchange gains on provisions 0 0
Charged in the year 0 0
Reclamation expenditures (8,749) (6,080)
Accretion expense (Note 23) 5,973 4,363
Provisions, ending 65,396 55,611
Litigation [member]    
Disclosure of other provisions [line items]    
Provisions, beginning 4,332 4,418
Revisions in estimates and obligations incurred 0 0
-new provisions 767 347
-change in estimate (228) (104)
-exchange gains on provisions 93 (32)
Charged in the year (867) (297)
Reclamation expenditures 0 0
Accretion expense (Note 23) 0 0
Provisions, ending $ 4,097 $ 4,332