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v3.19.1

Mineral Properties, Plant and Equipment - Rollforward of Carrying Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | $ 1,336,683 | $ 1,222,727
Additions | 149,020 | 148,102
Acquisition of mineral interests |  | 40,345
Disposals | (1,333) | (2,905)
Depreciation and amortisation expense | (147,289) | (122,888)
Depreciation charge captured in inventory | (12,620) | (4,104)
(Impairment charges) reversals | (27,789) |
Reversals of impairment | 27,789 | (61,554)
Transfers to Assets Held for Sale |  | (7,949)
Transfers | 0 | (2,580)
Closure and decommissioning – changes in estimate | 4,330 | 4,381
Carrying value, ending | 1,301,002 | 1,336,683
Cost | 3,710,845 | 3,639,050
Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | (2,302,367) |
Carrying value, ending | (2,409,843) | (2,302,367)
Other property, plant and equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | 244,863 | 209,695
Additions | 16,896 | 23,938
Acquisition of mineral interests |  | 30
Disposals | (937) | (2,710)
Depreciation and amortisation expense | (78,354) | (69,764)
Depreciation charge captured in inventory | 0 | 0
(Impairment charges) reversals | (532) |
Reversals of impairment |  | (25,814)
Transfers to Assets Held for Sale |  | (2)
Transfers | 117,971 | 57,862
Closure and decommissioning – changes in estimate | 0 | 0
Carrying value, ending | 299,907 | 244,863
Cost | 939,993 | 889,655
Other property, plant and equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | (644,792) |
Carrying value, ending | (640,086) | (644,792)
Depletable, Reserves and Resources [member] | Mining property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | 766,883 | 694,501
Additions | 106,701 | 120,098
Acquisition of mineral interests |  | 0
Disposals | 0 | 0
Depreciation and amortisation expense | (68,935) | (53,124)
Depreciation charge captured in inventory | (12,620) | (4,104)
(Impairment charges) reversals | (2,144) |
Reversals of impairment |  | (27,531)
Transfers to Assets Held for Sale |  | 0
Transfers | (115,726) | (22,400)
Closure and decommissioning – changes in estimate | 4,330 | 4,381
Carrying value, ending | 678,489 | 766,883
Cost | 1,997,880 | 2,018,937
Depletable, Reserves and Resources [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | (1,252,054) |
Carrying value, ending | (1,319,391) | (1,252,054)
Non-depletable, Reserves and Resources [member] | Mining property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | 71,809 | 58,578
Additions | 25,423 | 4,066
Acquisition of mineral interests |  | 40,315
Disposals | (396) | 0
Depreciation and amortisation expense | 0 | 0
Depreciation charge captured in inventory | 0 | 0
(Impairment charges) reversals | (25,113) |
Reversals of impairment |  | (6,892)
Transfers to Assets Held for Sale |  | 0
Transfers | 1,652 | (38,042)
Closure and decommissioning – changes in estimate | 0 | 0
Carrying value, ending | 73,375 | 71,809
Cost | 104,614 | 77,242
Non-depletable, Reserves and Resources [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | (5,433) |
Carrying value, ending | (31,239) | (5,433)
Non-depletable, Exploration and Evaluation [member] | Mining property [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | 253,128 | 259,953
Additions | 0 | 0
Acquisition of mineral interests |  | 0
Disposals | 0 | (195)
Depreciation and amortisation expense | 0 | 0
Depreciation charge captured in inventory | 0 | 0
(Impairment charges) reversals | 0 |
Reversals of impairment |  | (1,317)
Transfers to Assets Held for Sale |  | (7,947)
Transfers | (3,897) | 0
Closure and decommissioning – changes in estimate | 0 | 0
Carrying value, ending | 249,231 | 253,128
Cost | 668,358 | 653,216
Non-depletable, Exploration and Evaluation [member] | Mining property [member] | Accumulated depreciation, amortisation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Carrying value, beginning | (400,088) |
Carrying value, ending | $ (419,127) | $ (400,088)

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