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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRS 16 on Impact on consolidated statement of profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating costs      
Cost of sales of goods, excluding depreciation and amortization $ 393,888 $ 512,874 $ 613,381
Depreciation and amortization (189,620) (226,335) (238,879)
Operating profit      
Administrative expenses. 67,185 76,297 77,099
Operating expenses, net. (2,690) 14,715 1,308
Operating profit (loss) (81,274) (58,013) 58,298
Other income (expense), net      
Finance costs 37,822 42,173 38,422
Profit (loss) before income tax (130,318) (43,535) 27,033
Minera Yanacocha SRL and subsidiary [Member]      
Operating costs      
Cost of sales of goods, excluding depreciation and amortization 666,456 692,721 619,424
Operating profit      
Administrative expenses. 1,227 1,744 2,783
Operating expenses, net. 34,322 35,987 76,155
Operating profit (loss) (85,012) 5,968 (22,588)
Other income (expense), net      
Finance costs 36,699 57,629 39,024
Profit (loss) before income tax $ (112,431) $ (30,329) $ (52,220)