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PROPERTY, PLANT AND EQUIPMENT - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 663,828 |
Property write downs |  | $ 2,466
Ending balance | 658,629 | 663,828
Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,041,565 | 645,736
Acquisition of Seabee Gold Operation (note 3) |  | 331,381
Additions | 111,203 | 94,637
Disposals | (14,555) | (19,583)
Impairment reversal | 24,357 |
Property write downs | (1,646) |
Change in estimate of close down and restoration provision | (9,128) | (42)
Transfers | 0 | (10,564)
Ending balance | 1,151,796 | 1,041,565
Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (377,737) | (297,024)
Charge for the year | (127,254) | (84,879)
Disposals | 11,824 | 4,166
Ending balance | (493,167) | (377,737)
Plant and equipment |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 17,307 | 6,113
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 232,838 |
Ending balance | 229,829 | 232,838
Plant and equipment | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 509,008 | 425,157
Acquisition of Seabee Gold Operation (note 3) |  | 52,318
Additions | 33,738 | 42,625
Disposals | (13,555) | (10,948)
Impairment reversal | 24,357 |
Property write downs | 0 |
Change in estimate of close down and restoration provision | (8,458) | 0
Transfers | 0 | (144)
Ending balance | 545,090 | 509,008
Plant and equipment | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (276,170) | (233,023)
Charge for the year | (50,915) | (47,313)
Disposals | 11,824 | 4,166
Ending balance | (315,261) | (276,170)
Mineral properties subject to depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Construction in progress | 3,715 | 1,833
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 204,710 |
Ending balance | 215,367 | 204,710
Mineral properties subject to depreciation | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 306,277 | 142,397
Acquisition of Seabee Gold Operation (note 3) |  | 62,229
Additions | 43,118 | 48,940
Disposals | 0 | 0
Impairment reversal | 0 |
Property write downs | (747) |
Change in estimate of close down and restoration provision | (670) | (42)
Transfers | 45,295 | 52,753
Ending balance | 393,273 | 306,277
Mineral properties subject to depreciation | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (101,567) | (64,001)
Charge for the year | (76,339) | (37,566)
Disposals | 0 | 0
Ending balance | (177,906) | (101,567)
Mineral properties not yet subject to depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 89,288 |
Ending balance | 77,582 | 89,288
Mineral properties not yet subject to depreciation | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 89,288 | 0
Acquisition of Seabee Gold Operation (note 3) |  | 128,100
Additions | 33,589 | 946
Disposals | 0 | 0
Impairment reversal | 0 |
Property write downs | 0 |
Change in estimate of close down and restoration provision | 0 | 0
Transfers | (45,295) | (39,758)
Ending balance | 77,582 | 89,288
Mineral properties not yet subject to depreciation | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Charge for the year | 0 | 0
Disposals | 0 | 0
Ending balance | 0 | 0
Exploration and evaluation assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 136,992 |
Ending balance | 135,851 | 136,992
Exploration and evaluation assets | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 136,992 | 78,182
Acquisition of Seabee Gold Operation (note 3) |  | 88,734
Additions | 758 | 2,126
Disposals | (1,000) | (8,635)
Impairment reversal | 0 |
Property write downs | (899) |
Change in estimate of close down and restoration provision | 0 | 0
Transfers | 0 | (23,415)
Ending balance | 135,851 | 136,992
Exploration and evaluation assets | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 0 | 0
Charge for the year | 0 | 0
Disposals | 0 | 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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