XML 120 R73.htm IDEA: XBRL DOCUMENT v3.8.0.1
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)