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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