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Investments in associates (Details 7) - 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)
Administrative expenses 83,597 81,692 84,372
Sales expenses (24,088) (21,733) (19,365)
Other operating income (expenses), net (13,589) 18,957 (5,340)
Finance income 5,517 6,830 11,026
Finance costs 34,623 31,580 27,572
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 (40.095%) 13,207 (365,321) (173,375)
Compania Minera Coimolache S.A. [Member]      
Disclosure of Investments in associates [Line Items]      
Revenue 203,790 198,873 177,347
Cost of sales (121,021) (107,913) (104,549)
Administrative expenses (3,829) (4,144) (2,185)
Sales expenses (946) (1,128) (1,111)
Other operating income (expenses), net (587) 755 765
Finance income 220 38 23
Finance costs (3,304) (1,614) (51)
Exchange difference (174) (117) (1,300)
Profit before income taxes 74,149 84,750 68,267
Income tax (23,362) (27,894) (29,861)
Net profit, reported 50,787 56,856 38,406
Adjustments to conform to the accounting policies of the Group 2,265 1,790 3,039
Net profit, adjusted 53,052 58,646 41,445
Group’s interest (40.095%) $ 21,271 $ 23,514 $ 16,617