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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 8) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]        
Raw materials and consumables   $ (271,912) $ (260,869) $ (227,617)
Classes of Employee Benefit Expenses        
Personnel expenses   (238,748) (260,869) (227,617)
Depreciation and amortization expense        
Depreciation expense   (188,157) (212,641) (232,455)
Depreciation of Right-of-use Assets (IFRS 16)   (5,450) 0 0
Property, plant and equipment   (49) (1,390) (5,205)
Goodwill   (140) (3,254)  
Non-current assets and disowned groups held for sale   (607)    
Amortization expense   (6,020) (6,376) (7,490)
Investment plan expenses   (18,367) (11,860) (14,796)
Non-metallic exploration expenses   (5,537) (5,864) (5,322)
Provision for site closure   (911) (2,045) (2,960)
Provision for materials, spare parts and supplies   (7,500) 1,721 1,746
Contractors   (127,970) (126,653) (123,415)
Leases   (50,660) (41,801) (40,430)
Mining concessions   (7,856) (8,168) (7,802)
Operation transport   (56,376) (64,352) (69,051)
Freight and product transport costs   46,264 51,387 55,383
Purchase of products from third parties   189,583 182,695 184,226
CORFO rights   (143,861) (182,954) 46,274
Export costs   97,103 107,418 86,831
Expenses related to Variable Parts Leases (IFRS 16)   (1,096) 0 0
Insurance   (16,968) (11,923) (10,255)
Variation in inventory   7,500 (1,721) (1,746)
Variation in provision on product inventory   17,107 (8,997) (14,989)
Other expenses, by nature   (85,284) (34,525) (70,133)
Total   (1,526,778) (1,640,664) (1,549,594)
Other expenses by nature [Member]        
Depreciation and amortization expense        
Legal expenses   (9,277) (15,139) $ (25,176)
Provision for materials, spare parts and supplies $ 76,009 (52,557) (20,597)  
Purchase of products from third parties (184,226) (189,583) (182,695)  
Export costs (86,831) (97,103) (107,418)  
Restructuring of joint ventures (6,000)   6,000  
Consultant and advisor services (14,348) (13,862) (12,848)  
Variation in inventory $ (76,009) $ 52,557 $ 20,597