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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating costs      
Cost of sales of goods, excluding depreciation and amortization $ 512,874 $ 613,381 $ 604,650
Depreciation and amortization (226,335) (238,879) (210,154)
Operating profit      
Administrative expenses. 76,297 77,099 80,666
Operating expenses, net. 14,715 1,308 13,230
Operating profit (loss) (58,013) 58,298 105,555
Other income (expense), net      
Finance costs 42,173 38,422 34,551
Profit (loss) before income tax (43,535) 27,033 92,667
IFRS 16 [Member]      
Operating costs      
Cost of sales of goods, excluding depreciation and amortization 5,991    
Depreciation and amortization (6,751)    
Total operating costs (760)    
Operating profit      
Administrative expenses. 272    
Operating expenses, net. 155    
Operating profit (loss) 427    
Other income (expense), net      
Finance costs 379    
Profit (loss) before income tax 46    
Minera Yanacocha SRL and subsidiary [Member]      
Operating costs      
Cost of sales of goods, excluding depreciation and amortization 692,721 619,424 772,647
Operating profit      
Administrative expenses. 1,744 2,783 4,760
Operating expenses, net. 35,987 76,155 63,514
Operating profit (loss) 5,968 (22,588) (154,129)
Other income (expense), net      
Finance costs 57,629 39,024 23,766
Profit (loss) before income tax (30,329) $ (52,220) $ (168,428)
Minera Yanacocha SRL and subsidiary [Member] | IFRS 16 [Member]      
Operating costs      
Depreciation and amortization 270    
Operating profit      
Operating profit (loss) (270)    
Other income (expense), net      
Finance costs 36    
Profit (loss) before income tax $ (306)