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INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance $ 842,557 $ 888,206
Translation differences (1,730) (1,216)
Acquisition of business (note 3) 316,908  
Additions 53,772 34,291
Disposals / Consumptions 32 (72)
Transfers (5,357)  
Depreciation charge (113,539) (78,652)
Intangible assets and goodwill, ending balance 1,092,579 842,557
Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 1,458,729 1,430,369
Intangible assets and goodwill, ending balance 1,817,081 1,458,729
Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (616,172) (542,163)
Intangible assets and goodwill, ending balance (724,502) (616,172)
Information system projects    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 51,459 66,743
Translation differences (1,730) (1,216)
Acquisition of business (note 3) 2,731  
Additions 35,867 19,775
Disposals / Consumptions 32 (69)
Transfers (512)  
Depreciation charge (26,874) (33,774)
Intangible assets and goodwill, ending balance 60,909 51,459
Information system projects | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 215,662 201,815
Intangible assets and goodwill, ending balance 249,379 215,662
Information system projects | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (164,203) (135,072)
Intangible assets and goodwill, ending balance (188,470) (164,203)
Mining assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 96,507 96,256
Translation differences 0 0
Acquisition of business (note 3) 0  
Additions 8,076 14,118
Disposals / Consumptions 0 0
Transfers 5,185  
Depreciation charge (15,431) (13,867)
Intangible assets and goodwill, ending balance 94,337 96,507
Mining assets | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 202,931 188,813
Intangible assets and goodwill, ending balance 216,196 202,931
Mining assets | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (106,424) (92,557)
Intangible assets and goodwill, ending balance (121,859) (106,424)
Exploration and evaluation costs    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 5,689 5,294
Translation differences 0 0
Acquisition of business (note 3) 0  
Additions 9,829 398
Disposals / Consumptions 0 (3)
Transfers (5,185)  
Depreciation charge 0 0
Intangible assets and goodwill, ending balance 10,333 5,689
Exploration and evaluation costs | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 5,689 5,294
Intangible assets and goodwill, ending balance 10,333 5,689
Exploration and evaluation costs | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 0 0
Intangible assets and goodwill, ending balance 0 0
Customer relationships and other contractual rights    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 25,552 55,163
Translation differences 0 0
Acquisition of business (note 3) 314,177  
Additions 0 0
Disposals / Consumptions 0 0
Transfers (4,845)  
Depreciation charge (70,191) (29,611)
Intangible assets and goodwill, ending balance 264,693 25,552
Customer relationships and other contractual rights | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 298,475 298,475
Intangible assets and goodwill, ending balance 604,931 298,475
Customer relationships and other contractual rights | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (272,923) (243,312)
Intangible assets and goodwill, ending balance (340,238) (272,923)
Trademarks    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 1,043 2,443
Translation differences 0 0
Acquisition of business (note 3) 0  
Additions 0 0
Disposals / Consumptions 0 0
Transfers 0  
Depreciation charge (1,043) (1,400)
Intangible assets and goodwill, ending balance 0 1,043
Trademarks | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 73,665 73,665
Intangible assets and goodwill, ending balance 73,935 73,665
Trademarks | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (72,622) (71,222)
Intangible assets and goodwill, ending balance (73,935) (72,622)
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 662,307 662,307
Translation differences 0 0
Acquisition of business (note 3) 0  
Additions 0 0
Disposals / Consumptions 0 0
Transfers 0  
Depreciation charge 0 0
Intangible assets and goodwill, ending balance 662,307 662,307
Goodwill | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 662,307 662,307
Intangible assets and goodwill, ending balance 662,307 662,307
Goodwill | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 0 0
Intangible assets and goodwill, ending balance $ 0 $ 0