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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | $ 3,645,827 | $ 4,747,759
Beginning balance | 3,645,827 | 4,747,759
Ending balance | 4,227,397 | 3,645,827
Land and buildings [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 125,905 | 274,986
Beginning balance | 125,905 | 274,986
Ending balance | 142,497 | 125,905
Plant and equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 710,307 | 911,093
Beginning balance | 710,307 | 911,093
Ending balance | 745,590 | 710,307
Capital works in progress [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 137,189 | 159,659
Beginning balance | 137,189 | 159,659
Ending balance | 52,088 | 137,189
Mineral properties and leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 2,594,931 | 3,331,001
Beginning balance | 2,594,931 | 3,331,001
Ending balance | 3,200,191 | 2,594,931
Capitalized Evaluation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 77,495 | 71,020
Beginning balance | 77,495 | 71,020
Ending balance | 87,031 | 77,495
Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 5,678,378 | 7,150,918
Beginning balance | 5,678,378 | 7,150,918
Additions/transfers | 349,090 | 330,979
Aquisition of Integra | 393,647 |
Sale of China Business |  | (1,801,061)
Proceeds on pre-commercial production and tailings retreatment | (38,200) | (3,708)
Other movements | (2,578) | 9,294
Disposals | (33,323) | (8,044)
Ending balance | 6,347,014 | 5,678,378
Cost [member] | Land and buildings [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 164,540 | 406,891
Beginning balance | 164,540 | 406,891
Additions/transfers | 12,322 | 24,121
Aquisition of Integra | 4,820 |
Sale of China Business |  | (266,878)
Other movements | 4,251 | 1,084
Disposals | (10) | (678)
Ending balance | 185,923 | 164,540
Cost [member] | Plant and equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 1,416,948 | 1,732,066
Beginning balance | 1,416,948 | 1,732,066
Additions/transfers | 115,684 | 62,050
Aquisition of Integra | 3,646 |
Sale of China Business |  | (376,571)
Other movements | (2,325) | 2,088
Disposals | (2,313) | (2,685)
Ending balance | 1,531,640 | 1,416,948
Cost [member] | Capital works in progress [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 141,922 | 164,392
Beginning balance | 141,922 | 164,392
Additions/transfers | (42,933) | 2,577
Sale of China Business |  | (24,712)
Other movements | (12,336) | (335)
Disposals | (29,832) |
Ending balance | 56,821 | 141,922
Cost [member] | Mineral properties and leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 3,877,473 | 4,776,549
Beginning balance | 3,877,473 | 4,776,549
Additions/transfers | 254,481 | 235,756
Aquisition of Integra | 385,181 |
Sale of China Business |  | (1,132,900)
Proceeds on pre-commercial production and tailings retreatment | (38,200) | (3,708)
Other movements | 7,832 | 6,457
Disposals | (1,168) | (4,681)
Ending balance | 4,485,599 | 3,877,473
Cost [member] | Capitalized Evaluation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | 77,495 | 71,020
Beginning balance | 77,495 | 71,020
Additions/transfers | 9,536 | 6,475
Ending balance | 87,031 | 77,495
Depreciation and impairment losses [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | (2,032,551) | (2,403,159)
Beginning balance | (2,032,551) | (2,403,159)
Depreciation for the year | (86,237) | (99,667)
Sale of China Business |  | 471,652
Other movements | (2,514) | (3,369)
Disposals | 1,685 | 1,992
Ending balance | (2,119,617) | (2,032,551)
Depreciation and impairment losses [member] | Land and buildings [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | (38,635) | (131,905)
Beginning balance | (38,635) | (131,905)
Depreciation for the year | (4,245) | (12,000)
Sale of China Business |  | 105,536
Other movements | (546) | (274)
Disposals |  | 8
Ending balance | (43,426) | (38,635)
Depreciation and impairment losses [member] | Plant and equipment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | (706,641) | (820,973)
Beginning balance | (706,641) | (820,973)
Depreciation for the year | (79,044) | (78,847)
Sale of China Business |  | 193,106
Other movements | (2,048) | (1,198)
Disposals | 1,683 | 1,271
Ending balance | (786,050) | (706,641)
Depreciation and impairment losses [member] | Capital works in progress [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | (4,733) | (4,733)
Beginning balance | (4,733) | (4,733)
Ending balance | (4,733) | (4,733)
Depreciation and impairment losses [member] | Mineral properties and leases [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment | (1,282,542) | (1,445,548)
Beginning balance | (1,282,542) | (1,445,548)
Depreciation for the year | (2,948) | (8,820)
Sale of China Business |  | 173,010
Other movements | 80 | (1,897)
Disposals | 2 | 713
Ending balance | $ (1,285,408) | $ (1,282,542)

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