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Investments in associates (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Investments in associates [Line Items]      
Net sales $ 1,223,942 $ 1,015,670 $ 846,269
Cost of sales (980,254) (824,973) (922,572)
Operating expenses (980,254) (824,973) (922,572)
Administrative expenses 83,597 81,692 84,372
Selling expenses 24,088 21,733 19,365
Impairment loss of long-lived assets 21,620 0 3,803
Finance income (costs) 34,623 31,580 27,572
Gain (loss) from currency exchange difference 2,928 2,638 (13,693)
Income (loss) before income tax 92,545 (255,237) (340,549)
Income tax 18,012 53,504 14,763
Net loss 64,435 (327,814) (375,545)
Group’s interest (43.65%) 13,207 (365,321) (173,375)
Minera Yanacocha S.R.L. [Member]      
Disclosure of Investments in associates [Line Items]      
Net sales 645,176 761,193 1,031,174
Other operating income 21,870 17,713 10,625
Cost of sales (746,918) (776,394) (751,736)
Cost of other operating income (2,062) (2,951) (2,524)
Operating expenses (748,980) (728,691) (754,260)
Administrative expenses (4,760) (8,780) (26,325)
Selling expenses 3,922 3,695 3,534
Impairment loss of long-lived assets 0 (889,499) 0
Finance income (costs) (23,766) (15,107) (22,734)
Gain (loss) from currency exchange difference 3,636 (13,741) (251)
Income (loss) before income tax (168,427) (1,000,626) 152,522
Income tax (7,026) (43,126) (602,717)
Net loss (175,454) (1,043,752) (450,195)
Group’s interest (43.65%) $ (76,585) $ (455,598) $ (196,510)