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Gains (losses) from operating activities in the statement of income by function of expenses, included according to their nature (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Remuneration and benefits to employees $ (260,863) $ (227,620) $ (208,697)
Raw material and supplies (203,569) (172,084) (162,335)
Depreciation expense (212,582) (232,275) (271,128)
Amortization expense (160) (219) (184)
Operating leases (75,395) (80,160) (71,548)
Investment plan expenses (13,384) (17,180) (17,697)
Contractors (78,825) (72,348) (66,051)
Mining concessions 8,168 7,802 7,313
Operations transport (64,352) (69,052) (59,399)
Freight and product transport costs 43,510 55,383 64,857
Purchases from third parties (239,781) (208,147) (211,928)
Insurance policies (9,816) (10,255) (12,033)
CORFO right 182,954 46,274 41,962
Export costs (84,816) (83,057) (105,307)
Other expenses, by nature (38,925) (14,034) (4,818)
Total (1,483,524) (1,394,822) (1,328,285)
Cost of Sales [Member]      
Inventory provision variation $ 11,600 $ (90,998) $ (10,774)