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Tax situation (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Income Tax Explanatory [Line Items] |  |  |
Current income tax expense | $ 23,837 | $ 39,444 | $ 14,222
Deferred income tax expense (benefit) | (5,825) | 14,060 | 541
Income tax expense (benefit) | 18,012 | 53,504 | 14,763
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Income Tax Explanatory [Line Items] |  |  |
Current Peruvian tax returns | 3,877 | 41,105 | 98,319
Royalties and mining taxes | 4,944 | 10,249 | 21,721
Other taxes | 211 | 323 | 639
Income tax prior year adjustments | (2,006) | (2,092) | (1,766)
Income tax prior years refunds | 0 | (6,458) | 0
Current income tax expense | 7,026 | 43,127 | 118,913
Deferred income tax expense (benefit) | 0 | 0 | 483,804
Income tax expense (benefit) | $ 7,026 | $ 43,127 | $ 602,717

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