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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)

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