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PROPERTY, PLANT AND EQUIPMENT - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | $ 658,629 |
Impairment reversal |  | $ 24,357
Ending balance | 701,175 | 658,629
Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 1,151,796 | 1,041,565
Additions | 150,373 | 111,203
Disposals | (16,792) | (14,555)
Costs written off | (9,998) |
Impairment reversal |  | 24,357
Property write downs |  | (1,646)
Change in estimate of close down and restoration provision | 3,269 | (9,128)
Transfers | 0 | 0
Ending balance | 1,278,648 | 1,151,796
Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (493,167) | (377,737)
Charge for the year | (106,186) | (127,254)
Disposals | 12,728 | 11,824
Costs written off | 9,152 |
Ending balance | (577,473) | (493,167)
Plant and equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 229,829 |
Ending balance | 283,729 | 229,829
Plant and equipment | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 545,090 | 509,008
Additions | 102,275 | 33,738
Disposals | (15,485) | (13,555)
Costs written off | (9,998) |
Impairment reversal |  | 24,357
Property write downs |  | 0
Change in estimate of close down and restoration provision | 0 | (8,458)
Transfers | 0 | 0
Ending balance | 621,882 | 545,090
Plant and equipment | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (315,261) | (276,170)
Charge for the year | (44,772) | (50,915)
Disposals | 12,728 | 11,824
Costs written off | 9,152 |
Ending balance | (338,153) | (315,261)
Mineral properties subject to depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 215,367 |
Ending balance | 224,228 | 215,367
Mineral properties subject to depreciation | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 393,273 | 306,277
Additions | 33,371 | 43,118
Disposals | 0 | 0
Costs written off | 0 |
Impairment reversal |  | 0
Property write downs |  | (747)
Change in estimate of close down and restoration provision | 3,269 | (670)
Transfers | 33,635 | 45,295
Ending balance | 463,548 | 393,273
Mineral properties subject to depreciation | Accumulated depreciation and amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | (177,906) | (101,567)
Charge for the year | (61,414) | (76,339)
Disposals |  | 0
Costs written off | 0 |
Ending balance | (239,320) | (177,906)
Mineral properties not yet subject to depreciation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 121,854 |
Ending balance | 101,990 | 121,854
Mineral properties not yet subject to depreciation | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 121,854 | 133,560
Additions | 13,771 | 33,589
Disposals | 0 | 0
Costs written off | 0 |
Impairment reversal |  | 0
Property write downs |  | 0
Change in estimate of close down and restoration provision | 0 | 0
Transfers | (33,635) | (45,295)
Ending balance | 101,990 | 121,854
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
Costs written off | 0 |
Ending balance | 0 | 0
Exploration and evaluation assets |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 91,579 |
Ending balance | 91,228 | 91,579
Exploration and evaluation assets | Gross carrying amount |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Beginning balance | 91,579 | 92,720
Additions | 956 | 758
Disposals | (1,307) | (1,000)
Costs written off | 0 |
Impairment reversal |  | 0
Property write downs |  | (899)
Change in estimate of close down and restoration provision | 0 | 0
Transfers | 0 | 0
Ending balance | 91,228 | 91,579
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
Costs written off | 0 |
Ending balance | $ 0 | $ 0

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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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers from construction in progress. [Refer: Property, plant and equipment; Construction in progress] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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