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Tax situation (Details 3) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Income Tax Explanatory [Line Items] |  |  |  |
Income (loss) before income tax |  | $ 92,545 | $ (255,237) | $ (340,549)
Peruvian statutory tax rate |  | 29.50% | 32.00% | 32.00%
Income tax expense (income) |  | $ 12,797 | $ 46,710 | $ 10,957
Effect of change in income tax rate |  | 0 | (1,431) | 2,347
Non-deductible expenses |  |  |  | 19,534
Adjustment due to income tax rate applicable to la Quinua |  | (24,502) | (3,012) | 42,044
Total income tax expense (benefit) |  | 18,012 | 53,504 | 14,763
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |
Disclosure Of Income Tax Explanatory [Line Items] |  |  |  |
Income (loss) before income tax |  | $ (168,428) | $ (1,000,625) | $ 152,522
Peruvian statutory tax rate | 29.50% | 29.50% | 28.00% | 28.00%
Income tax expense (income) |  | $ (49,686) | $ (280,175) | $ 42,706
Valuation allowance on deferred tax asset |  | 50,960 | 386,763 | 510,004
Effect of change in income tax rate |  | 0 | (66,667) | 16,576
Mining taxes |  | 3,530 | 7,392 | 15,639
Non-deductible expenses |  | 4,204 | 3,296 | 15,288
Adjustment due to income tax rate applicable to la Quinua |  | (124) | (1,024) | 2,504
Income tax prior years refunds |  | (1,858) | (6,458) | 0
Total income tax expense (benefit) |  | $ 7,026 | $ 43,127 | $ 602,717

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