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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 8) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation and amortization expense      
Depreciation of Right-of-use Assets $ 8,431 $ 7,951  
Properties plant and equipment (9,563) (49)  
Goodwill (140) (140)  
Operation leases 1,133 1,535 $ 0
Expenses related to Variable Parts Leases (IFRS 16) (1,133,000) (1,096,000)  
Other expenses by nature [Member]      
Statement [Line Items]      
Raw materials and consumables (287,877) (271,912) (260,869)
Classes of Employee Benefit Expenses      
Personnel expenses (234,108) (238,748) (267,451)
Depreciation and amortization expense      
Depreciation expense (182,452) (188,293) (212,700)
Depreciation of Right-of-use Assets (8,431) (7,951) 0
Impairment of Value (1,658) (913) (1,390)
Properties plant and equipment (9,563) (49) (3,254)
Goodwill (140) (140) 0
Amortization expense (13,029) (5,107) (8,127)
Operation leases (60,572) (51,361) (41,801)
Legal expenses (69,965) (9,277) (15,139)
Investment plan expenses (15,150) (20,060) (19,415)
Exploration expenses (5,262) (5,537) (5,864)
Provision for site closure (911) (911) (2,045)
Provision for materials, spare parts and supplies 640 (7,500) 1,721
Contractors (147,080) (125,667) (126,653)
Mining concessions (6,645) (7,856) (8,168)
Operation transport (68,730) (56,376) (64,352)
Freight and product transport costs (52,156) (46,264) (51,387)
Purchase of products from third parties (224,115) (210,583) (182,695)
CORFO rights (74,418) (143,861) (182,954)
Export costs (71,718) (75,908) (107,418)
Expenses related to Variable Parts Leases (IFRS 16) (1,133) (1,037) 0
Insurance (21,135) (19,521) (13,681)
Restructuring of joint ventures     6,000
Consultant and advisor services (13,880) (13,862) (12,848)
Variation in inventory 97,467 52,557 20,597
Variation in provision on product inventory 7,244 17,107 (8,997)
Other expenses, by nature (76,173) (87,748) (71,774)
Total $ (1,540,950) $ (1,526,778) $ (1,640,664)