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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