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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)

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