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Mineral Properties, Plant and Equipment - Rollforward of Carrying Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning $ 2,504,901 $ 1,301,002
Additions 191,224 263,733
Tahoe acquisition (Note 8)   1,239,401
Disposals (14,970) (4,484)
Depreciation and amortization (272,444) (253,453)
Depreciation charge captured in inventory (29,618) (33,810)
(Impairment charges) reversals 0 (40,050)
Impairment charge 0 40,050
Transfers 0 0
Closure and decommissioning – changes in estimate (Note 17) 35,913 32,562
Carrying value, ending 2,415,006 2,504,901
Cost 5,452,665 5,181,329
Depreciation and amortization included in mine care and maintenance (18,000)  
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning (2,676,428)  
Carrying value, ending (3,037,659) (2,676,428)
Other property, plant and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning 771,674 299,907
Additions 30,971 68,664
Tahoe acquisition (Note 8)   455,080
Disposals (382) (2,010)
Depreciation and amortization (146,108) (140,386)
Depreciation charge captured in inventory 0 0
Impairment charge   0
Transfers 23,376 90,419
Closure and decommissioning – changes in estimate (Note 17) 0
Carrying value, ending 679,531 771,674
Cost 1,461,678 1,476,170
Other property, plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning (704,496)  
Carrying value, ending (782,147) (704,496)
Depletable, Reserves and Resources [member] | Mining property [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning 950,752 678,489
Additions 142,463 152,033
Tahoe acquisition (Note 8)   314,604
Disposals (235) (2,461)
Depreciation and amortization (125,277) (113,067)
Depreciation charge captured in inventory (29,618) (33,810)
Impairment charge   0
Transfers 22,747 (77,598)
Closure and decommissioning – changes in estimate (Note 17) 35,913 32,562
Carrying value, ending 996,745 950,752
Cost 2,824,861 2,429,815
Depletable, Reserves and Resources [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning (1,479,063)  
Carrying value, ending (1,828,116) (1,479,063)
Non-depletable, Reserves and Resources [member] | Mining property [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning 331,549 73,375
Additions 17,159 42,487
Tahoe acquisition (Note 8)   274,817
Disposals (38) (13)
Depreciation and amortization (1,059) 0
Depreciation charge captured in inventory 0 0
Impairment charge   33,245
Transfers (40,531) (25,872)
Closure and decommissioning – changes in estimate (Note 17) 0
Carrying value, ending 307,080 331,549
Cost 321,639 398,485
Non-depletable, Reserves and Resources [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning (66,936)  
Carrying value, ending (14,559) (66,936)
Non-depletable, Exploration and Evaluation [member] | Mining property [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning 450,926 249,231
Additions 631 549
Tahoe acquisition (Note 8)   194,900
Disposals (14,315) 0
Depreciation and amortization 0 0
Depreciation charge captured in inventory 0 0
Impairment charge   6,805
Transfers (5,592) 13,051
Closure and decommissioning – changes in estimate (Note 17) 0
Carrying value, ending 431,650 450,926
Cost 844,487 876,859
Non-depletable, Exploration and Evaluation [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Carrying value, beginning (425,933)  
Carrying value, ending $ (412,837) $ (425,933)