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Tax situation - Reconciliation of tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Jan. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income Tax Explanatory          
Income (loss) before income tax     $ (43,535) $ 27,033 $ 92,667
Peruvian statutory tax rate     29.50% 32.00% 32.00%
Income tax expense (income)     $ 25,766 $ (22,462) $ (12,796)
Adjustment due to income tax rate applicable to la Quinua     14,995 (15,248) 24,502
Total income tax expense (benefit)     25,590 (26,879) (17,888)
Minera Yanacocha SRL and subsidiary [Member]          
Disclosure Of Income Tax Explanatory          
Income (loss) before income tax     $ (30,329) $ (52,220) $ (168,428)
Peruvian statutory tax rate 29.00% 29.50% 29.50% 29.50% 29.50%
Income tax expense (income)     $ (8,947) $ (15,405) $ (49,686)
Valuation allowance on deferred tax asset     46,473 23,771 50,960
Effect of change in income tax rate     (4,217) 0 0
Mining taxes     8,068 6,260 3,530
Non-deductible expenses     13,045 6,962 4,204
Adjustment due to income tax rate applicable to la Quinua       (176) (124)
Income tax prior years refunds     6,450 7,885 (1,858)
Fines from prior years, note 24     4,056 0 0
Total income tax expense (benefit)     $ 64,928 $ 29,297 $ 7,026