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Tax situation - Reconciliation of tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Income Tax Explanatory        
Income (loss) before income tax   $ (130,318) $ (43,535) $ 27,033
Peruvian statutory tax rate 29.50% 32.00% 32.00% 32.00%
Income tax expense (income)   $ (23,716) $ 25,766 $ (22,462)
Non-deductible expenses   (11,789) (6,877) (1,095)
Difference in income tax rate applicable to La Quinua at 29%   (31,853) 14,995 (15,248)
Total income tax   25,430 (25,590) 26,879
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure Of Income Tax Explanatory        
Income (loss) before income tax   $ (112,431) $ (30,329) $ (52,220)
Peruvian statutory tax rate 29.50% 29.50% 29.50% 29.50%
Income tax expense (income)   $ (33,167) $ (8,947) $ (15,405)
Valuation allowance on deferred tax asset   57,131 46,473 23,771
Effect of change in income tax rate   23,075 (4,217) 0
Royalties and Mining taxes   5,065 11,444 8,888
Credit of Royalties and Mining taxes   (1,494) (3,376) (2,622)
Non-deductible expenses   7,015 13,837 6,572
Ruling on a tax case   (2,895) (2,801)  
Income tax prior years refunds   (1,712) 8,459 8,269
Difference in income tax rate applicable to La Quinua at 29%       (176)
Fines from prior years   0 4,056 0
Total income tax   $ 53,018 $ 64,928 $ 29,297