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Investments in associates (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Investments in associates [Line Items]      
Revenue $ 1,274,378 $ 1,068,791 $ 929,522
Cost of sales (980,254) (824,973) (922,572)
Sales expenses (24,088) (21,733) (19,365)
Other operating expenses, net (13,589) 18,957 (5,340)
Finance costs 34,623 31,580 27,572
Finance income 5,517 6,830 11,026
Net gain (loss) of exchange difference 2,928 2,638 (13,693)
Profit before income taxes 92,545 (255,237) (340,549)
Income tax 18,012 53,504 14,763
Net profit, reported 64,435 (327,814) (375,545)
Group’s interest (19.584%) 13,207 (365,321) (173,375)
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of Investments in associates [Line Items]      
Revenue 3,202,931 2,384,154 1,115,617
Cost of sales (1,768,238) (1,553,040) (862,004)
Sales expenses (141,669) (131,391) (56,215)
Other operating expenses, net (258,826) (24,107) (26,600)
Finance costs (216,912) (80,438) (16,010)
Finance income 5,350 954 512
Net gain (loss) of exchange difference 13,288 7,857 (75,770)
Profit before income taxes 835,924 603,989 79,530
Income tax (486,043) (263,082) (46,246)
Net profit, reported 349,881 340,907 33,284
Group’s interest (19.584%) $ 68,521 $ 66,763 $ 6,518