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Investments in associates and joint venture - Net share in profit (loss) of investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in associates and joint ventures      
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method $ (9,517) $ 47,710 $ (1,144)
Net share in profit (loss) of investments in joint venture (252) (44)  
Net share in profit (loss) of investments (9,517) 47,710 (1,144)
Minera Yanacocha S.R.L. [Member]      
Investments in associates and joint ventures      
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method (72,219) (41,580) (35,582)
Net share in profit (loss) of investments in associates (72,219) (41,580) (35,582)
Net share in profit (loss) of investments (72,219) (41,580) (35,582)
Sociedad Minera Cerro Verde Saa [Member]      
Investments in associates and joint ventures      
Net share in profit (loss) of investments in associates 53,767 76,451 23,444
Compania Minera Coimolache S.A. [Member]      
Investments in associates and joint ventures      
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 10,055 12,883 10,994
Net share in profit (loss) of investments in associates 10,055 12,883 10,994
Net share in profit (loss) of investments 10,055 12,883 10,994
Tinka Resources Ltd [Member]      
Investments in associates and joint ventures      
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method (868)    
Net share in profit (loss) of investments in associates (868)    
Net share in profit (loss) of investments (868)    
Other minor investments [Member]      
Investments in associates and joint ventures      
Net share in profit (loss) of investments in associates $ (9,265) $ 47,754 $ (1,144)