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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Depreciation of Right-of-use Assets (contracts under IFRS 16) $ (8,431) $ (7,951)  
Expenses related to Variable Parts Leases (IFRS 16) (1,133,000) (1,096,000)  
Total (1,334,321) (1,383,603) $ (1,485,631)
Cost Of Sales [Member]      
Statement [Line Items]      
Remuneration and benefits to employees (287,877) (271,912) (260,869)
Raw material and supplies (178,956) (178,493) (203,571)
Depreciation expense (182,410) (188,157) (212,641)
Depreciation of Right-of-use Assets (contracts under IFRS 16) (5,814) (5,450) 0
Amortization expense (12,655) (5,102) (6,376)
Investment plan expenses (14,286) (18,367) (11,860)
Provision for site closure (911) (911) (2,045)
Provision for materials, spare parts and supplies 640 (7,500) 1,721
Contractors (142,001) (120,793) (120,923)
Operating leases (57,461) (47,708) (37,245)
Mining concessions (6,645) (7,856) (8,168)
Operations 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)
Insurance (17,657) (16,968) (11,923)
CORFO right (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
Variation in inventory 97,467 52,557 20,597
Variation in inventory provision 7,244 17,107 (8,997)
Other expenses, by nature (40,729) (50,021) (34,525)
Total $ (1,334,321) $ (1,383,603) $ (1,485,631)