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Tax situation (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit before income tax $ 92,545 $ (255,237) $ (340,549)
Income tax rate 29.50% 32.00% 32.00%
Expected income tax expense $ 12,797 $ 46,710 $ 10,957
Non - deductible expenses     19,534
Royalty case     0
Special mining tax and mining royalties     (4,672)
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 26% to 29.5%) 0 (1,431) 2,347
Income tax true - ups     (6,082)
Others 16,513 6,577 4,447
Current and deferred income tax charges to results 263,433 222,594 31,183
Mining taxes charged to results     14,599
Supplementary retirement fund charged to results 9,330 2,725 464
Tax expense (income), continuing operations 18,012 53,504 14,763
Sociedad Minera Cerro Verde S.A.A. [Member]      
Profit before income tax $ 835,924 $ 603,989 $ 79,530
Income tax rate 32.00% 32.00% 32.00%
Expected income tax expense $ 267,496 $ 193,276  
Non - deductible expenses 25,217 27,788  
Royalty case (12,029) 0  
Special mining tax and mining royalties (21,704) (12,084)  
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 26% to 29.5%) (1,632) 13,850  
Income tax true - ups 10,210 1,677  
Others (4,125) (1,913)  
Current and deferred income tax charges to results 263,433 222,594 $ 31,183
Mining taxes charged to results 213,280 37,763 14,599
Supplementary retirement fund charged to results 9,330 2,725 464
Tax expense (income), continuing operations $ (486,043) $ (263,082) $ (46,246)
Effective income tax 58.14% 43.56% 58.15%