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Tax situation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Income Tax Explanatory [Line Items] |  |  |
Current income tax expense | $ 16,928 | $ 23,837 | $ 39,444
Deferred income tax expense (benefit) | 9,998 | (5,825) | 14,060
Income tax expense (benefit) | (26,926) | (18,012) | (53,504)
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Income Tax Explanatory [Line Items] |  |  |
Current Peruvian tax returns | 12,525 | 3,877 | 41,105
Royalties and mining taxes | 8,888 | 4,944 | 10,249
Other taxes | 55 | 211 | 323
Income tax prior year adjustments | 8,900 | (2,006) | (2,092)
Income tax prior years refunds | 0 | 0 | (6,458)
Current income tax expense | 30,368 | 7,026 | 43,127
Deferred income tax expense (benefit) | (1,071) | 0 | 0
Income tax expense (benefit) | $ 29,297 | $ 7,026 | $ 43,127

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