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OPERATING SEGMENTS - Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 853,089 $ 606,850
Production costs (418,652) (329,810)
Depletion and depreciation (125,795) (106,157)
Cost of sales (544,447) (435,967)
Income from mine operations 308,642 170,883
Exploration, evaluation and reclamation (expense) recovery (22,397) (17,616)
Care and maintenance expense (29,593) 0
Transaction and integration expense (20,813) 0
Operating income (loss) 202,713 122,338
Income (loss) before income tax 181,321 86,129
Total assets 5,244,986 1,750,107
Non-current assets 3,820,464 850,445
Total liabilities (1,305,083) (616,153)
Write-down of metals inventories 8,600 3,600
Puna    
Disclosure of operating segments [line items]    
Write-down of metals inventories 8,600 3,600
Operating segments | Copler    
Disclosure of operating segments [line items]    
Revenue 205,536  
Production costs (120,618)  
Depletion and depreciation (34,053)  
Cost of sales (154,671)  
Income from mine operations 50,865  
Exploration, evaluation and reclamation (expense) recovery (3,558)  
Care and maintenance expense 0  
Transaction and integration expense 0  
Operating income (loss) 47,213  
Income (loss) before income tax 41,253  
Total assets 2,486,927  
Non-current assets 2,030,998  
Total liabilities (735,225)  
Operating segments | Marigold    
Disclosure of operating segments [line items]    
Revenue 409,798 315,320
Production costs (196,409) (183,782)
Depletion and depreciation (47,844) (52,291)
Cost of sales (244,253) (236,073)
Income from mine operations 165,545 79,247
Exploration, evaluation and reclamation (expense) recovery (2,462) (4,139)
Care and maintenance expense 0  
Transaction and integration expense 0  
Operating income (loss) 162,648 73,829
Income (loss) before income tax 159,641 58,269
Total assets 642,106 524,113
Non-current assets 277,196 249,962
Total liabilities (121,328) (119,413)
Operating segments | Seabee    
Disclosure of operating segments [line items]    
Revenue 135,230 146,141
Production costs (41,308) (48,470)
Depletion and depreciation (28,233) (36,368)
Cost of sales (69,541) (84,838)
Income from mine operations 65,689 61,303
Exploration, evaluation and reclamation (expense) recovery (6,108) (8,511)
Care and maintenance expense (13,643)  
Transaction and integration expense 0  
Operating income (loss) 45,811 52,371
Income (loss) before income tax 46,304 40,851
Total assets 455,249 484,750
Non-current assets 311,552 310,578
Total liabilities (90,780) (97,131)
Operating segments | Puna    
Disclosure of operating segments [line items]    
Revenue 102,525 145,389
Production costs (60,317) (97,558)
Depletion and depreciation (15,665) (17,498)
Cost of sales (75,982) (115,056)
Income from mine operations 26,543 30,333
Exploration, evaluation and reclamation (expense) recovery 2,144 (818)
Care and maintenance expense (15,950)  
Transaction and integration expense 0  
Operating income (loss) 11,222 27,578
Income (loss) before income tax (2,410) 12,652
Total assets 241,079 270,633
Non-current assets 143,694 155,049
Total liabilities (50,130) (70,676)
Operating segments | Exploration, evaluation and development properties    
Disclosure of operating segments [line items]    
Revenue 0 0
Production costs 0 0
Depletion and depreciation 0 0
Cost of sales 0 0
Income from mine operations 0 0
Exploration, evaluation and reclamation (expense) recovery (11,874) (3,501)
Care and maintenance expense 0  
Transaction and integration expense 0  
Operating income (loss) (11,874) (3,549)
Income (loss) before income tax (12,678) (2,937)
Total assets 1,038,498 115,191
Non-current assets 1,036,507 114,327
Total liabilities (29,710) (6,216)
Other reconciling items    
Disclosure of operating segments [line items]    
Revenue 0 0
Production costs 0 0
Depletion and depreciation 0 0
Cost of sales 0 0
Income from mine operations 0 0
Exploration, evaluation and reclamation (expense) recovery (539) (647)
Care and maintenance expense 0  
Transaction and integration expense (20,813)  
Operating income (loss) (52,307) (27,891)
Income (loss) before income tax (50,789) (22,706)
Total assets 381,127 355,420
Non-current assets 20,517 20,529
Total liabilities $ (277,910) $ (322,717)