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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