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Tax situation (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit before income tax $ 22,475 $ 92,545 $ (255,237)
Income tax rate 32.00% 32.00%  
Expected income tax expense $ 22,502 $ 12,797 46,710
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 32% to 31.18%) 0 0 (1,431)
Others 3,492 16,513 6,577
Tax expense (income), continuing operations (26,926) (18,012) (53,504)
Sociedad Minera Cerro Verde S.A.A. [Member]      
Profit before income tax $ 444,880 $ 835,924 $ 603,989
Income tax rate 32.00% 32.00% 32.00%
Expected income tax expense $ 142,362 $ 267,496 $ 193,276
Non - deductible expenses 25,352 25,217 27,788
Royalty case 143,728 (12,029) 0
Special mining tax and mining royalties (25,165) (21,704) (12,084)
Special mining burden (GEM) (22,334) 0 0
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 32% to 31.18%) (1,958) (1,632) 13,850
Income tax true - ups (10,312) 10,210 1,677
Others 4,896 (4,125) (1,913)
Current and deferred income tax charges to results 256,569 263,433 222,594
Mining taxes charged to results 65,055 213,280 37,763
Supplementary retirement fund charged to results 3,546 9,330 2,725
Tax expense (income), continuing operations $ 325,170 $ (486,043) $ (263,082)
Effective income tax 73.09% 58.14% 43.56%