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INTANGIBLE ASSETS, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance $ 1,092,579 $ 842,557
Effect of inflation adjustment 4,966  
Translation differences (6,674) (1,730)
Acquisition of business (note 3)   316,908
Additions 40,478 53,772
Disposals / Consumptions (87) (32)
Transfers 478 (5,357)
Depreciation charge (119,216) (113,539)
Intangible assets and goodwill, ending balance 1,012,524 1,092,579
Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 1,817,081 1,458,729
Intangible assets and goodwill, ending balance 1,901,185 1,817,081
Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (724,502) (616,172)
Intangible assets and goodwill, ending balance (888,661) (724,502)
Information system projects    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 60,909 51,459
Effect of inflation adjustment 4,966  
Translation differences (6,674) (1,730)
Acquisition of business (note 3)   2,731
Additions 27,594 35,867
Disposals / Consumptions (87) (32)
Transfers 480 (512)
Depreciation charge (15,427) (26,874)
Intangible assets and goodwill, ending balance 71,761 60,909
Information system projects | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 249,379 215,662
Intangible assets and goodwill, ending balance 320,600 249,379
Information system projects | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (188,470) (164,203)
Intangible assets and goodwill, ending balance (248,839) (188,470)
Mining assets    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 94,337 96,507
Effect of inflation adjustment 0  
Translation differences 0 0
Acquisition of business (note 3)   0
Additions 10,243 8,076
Disposals / Consumptions 0 0
Transfers (10,237) 5,185
Depreciation charge (18,055) (15,431)
Intangible assets and goodwill, ending balance 76,288 94,337
Mining assets | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 216,196 202,931
Intangible assets and goodwill, ending balance 216,203 216,196
Mining assets | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (121,859) (106,424)
Intangible assets and goodwill, ending balance (139,915) (121,859)
Exploration and evaluation costs    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 10,333 5,689
Effect of inflation adjustment 0  
Translation differences 0 0
Acquisition of business (note 3)   0
Additions 2,641 9,829
Disposals / Consumptions 0 0
Transfers 10,235 (5,185)
Depreciation charge 0 0
Intangible assets and goodwill, ending balance 23,209 10,333
Exploration and evaluation costs | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 10,333 5,689
Intangible assets and goodwill, ending balance 23,209 10,333
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 264,693 25,552
Effect of inflation adjustment 0  
Translation differences 0 0
Acquisition of business (note 3)   314,177
Additions 0 0
Disposals / Consumptions 0 0
Transfers 0 (4,845)
Depreciation charge (85,734) (70,191)
Intangible assets and goodwill, ending balance 178,959 264,693
Customer relationships and other contractual rights | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 604,931 298,475
Intangible assets and goodwill, ending balance 604,931 604,931
Customer relationships and other contractual rights | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (340,238) (272,923)
Intangible assets and goodwill, ending balance (425,972) (340,238)
Trademarks    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 0 1,043
Effect of inflation adjustment 0  
Translation differences 0 0
Acquisition of business (note 3)   0
Additions 0 0
Disposals / Consumptions 0 0
Transfers 0 0
Depreciation charge 0 (1,043)
Intangible assets and goodwill, ending balance 0 0
Trademarks | Cost    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 73,935 73,665
Intangible assets and goodwill, ending balance 73,935 73,935
Trademarks | Accumulated depreciation    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance (73,935) (72,622)
Intangible assets and goodwill, ending balance (73,935) (73,935)
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets and goodwill, beginning balance 662,307 662,307
Effect of inflation adjustment 0  
Translation differences 0 0
Acquisition of business (note 3)   0
Additions 0 0
Disposals / Consumptions 0 0
Transfers 0 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