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Tax situation (Details 2) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Income Tax Explanatory [Line Items]        
Income (loss) before income tax   $ 22,475 $ 92,545 $ (255,237)
Peruvian statutory tax rate   32.00% 32.00%  
Income tax expense (income)   $ 22,502 $ 12,797 46,710
Effect of change in income tax rate   0 0 (1,431)
Adjustment due to income tax rate applicable to la Quinua   15,248 (24,502) (3,012)
Total income tax expense (benefit)   (26,926) (18,012) (53,504)
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure Of Income Tax Explanatory [Line Items]        
Income (loss) before income tax   $ (52,220) $ (168,428) $ (1,000,625)
Peruvian statutory tax rate 29.50% 29.50% 29.50% 28.00%
Income tax expense (income)   $ (15,405) $ (49,686) $ (280,175)
Valuation allowance on deferred tax asset   23,771 50,960 386,763
Effect of change in income tax rate   0 (66,667)
Mining taxes   6,260 3,530 7,392
Non-deductible expenses   6,962 4,204 3,296
Adjustment due to income tax rate applicable to la Quinua   (176) (124) (1,024)
Income tax prior years refunds   7,885 (1,858) (6,458)
Total income tax expense (benefit)   $ 29,297 $ 7,026 $ 43,127