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MINERAL PROPERTIES, PLANT AND EQUIPMENT - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | $ 769,462 |  |
Ending balance | 3,565,905 | $ 769,462 |
Right-of-use assets | 121,642 | 3,502 | $ 0
Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 1,438,391 | 1,278,648 |
Alacler acquisitions | 2,789,832 |  |
Additions | 173,573 | 166,944 |
Disposals/removal of fully depreciated assets | (47,136) |  |
Disposals |  | (15,853) |
Change in reclamation and closure cost provision | 10,187 | 8,652 |
Transfers | 0 | 0 |
Ending balance | 4,364,847 | 1,438,391 |
Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (668,929) | (577,473) |
Depletion and depreciation | (170,798) | (104,009) |
Disposals/removal of fully depreciated assets | 40,785 |  |
Disposals |  | 12,553 |
Ending balance | (798,942) | (668,929) |
Plant and equipment |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 287,970 |  |
Ending balance | 1,243,256 | 287,970 |
Right-of-use assets | 121,600 | 3,500 |
Plant and equipment | Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 663,368 | 577,023 |
Alacler acquisitions | 926,228 |  |
Additions | 2,927 | 6,515 |
Disposals/removal of fully depreciated assets | (22,466) |  |
Disposals |  | (12,457) |
Change in reclamation and closure cost provision | 0 | 0 |
Transfers | 105,226 | 92,287 |
Ending balance | 1,675,283 | 663,368 |
Plant and equipment | Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (375,398) | (338,153) |
Depletion and depreciation | (73,041) | (48,226) |
Disposals/removal of fully depreciated assets | 16,412 |  |
Disposals |  | 10,981 |
Ending balance | (432,027) | (375,398) |
Construction in progress |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 28,208 |  |
Ending balance | 43,007 | 28,208 |
Construction in progress | Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 28,208 | 44,859 |
Alacler acquisitions | 26,874 |  |
Additions | 104,475 | 75,636 |
Disposals/removal of fully depreciated assets | (297) |  |
Disposals |  | 0 |
Change in reclamation and closure cost provision | 0 | 0 |
Transfers | (116,253) | (92,287) |
Ending balance | 43,007 | 28,208 |
Construction in progress | Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 0 | 0 |
Depletion and depreciation | 0 | 0 |
Disposals/removal of fully depreciated assets | 0 |  |
Disposals |  | 0 |
Ending balance | 0 | 0 |
Mineral properties subject to depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 245,847 |  |
Ending balance | 1,109,701 | 245,847 |
Mineral properties subject to depreciation | Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 539,378 | 463,548 |
Alacler acquisitions | 882,742 |  |
Additions | 55,477 | 42,373 |
Disposals/removal of fully depreciated assets | (24,373) |  |
Disposals |  | (2,962) |
Change in reclamation and closure cost provision | 8,799 | 7,580 |
Transfers | 14,593 | 28,839 |
Ending balance | 1,476,616 | 539,378 |
Mineral properties subject to depreciation | Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (293,531) | (239,320) |
Depletion and depreciation | (97,757) | (55,783) |
Disposals/removal of fully depreciated assets | 24,373 |  |
Disposals |  | 1,572 |
Ending balance | (366,915) | (293,531) |
Mineral properties not yet subject to depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 80,296 |  |
Ending balance | 225,528 | 80,296 |
Mineral properties not yet subject to depreciation | Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 80,296 | 101,990 |
Alacler acquisitions | 146,086 |  |
Additions | 2,714 | 7,145 |
Disposals/removal of fully depreciated assets | 0 |  |
Disposals |  | 0 |
Change in reclamation and closure cost provision | 0 | 0 |
Transfers | (3,568) | (28,839) |
Ending balance | 225,528 | 80,296 |
Mineral properties not yet subject to depreciation | Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 0 | 0 |
Depletion and depreciation | 0 | 0 |
Disposals/removal of fully depreciated assets | 0 |  |
Disposals |  | 0 |
Ending balance | 0 | 0 |
Exploration and evaluation assets |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 127,141 |  |
Ending balance | 944,413 | 127,141 |
Exploration and evaluation assets | Gross carrying amount |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 127,141 | 91,228 |
Alacler acquisitions | 807,902 |  |
Additions | 7,980 | 35,275 |
Disposals/removal of fully depreciated assets | 0 |  |
Disposals |  | (434) |
Change in reclamation and closure cost provision | 1,388 | 1,072 |
Transfers | 2 | 0 |
Ending balance | 944,413 | 127,141 |
Exploration and evaluation assets | Accumulated depreciation and amortisation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 0 | 0 |
Depletion and depreciation | 0 | 0 |
Disposals/removal of fully depreciated assets | 0 |  |
Disposals |  | 0 |
Ending balance | $ 0 | $ 0 |

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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