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Net sales - Other operating revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) $ 2,690 $ 14,715 $ (1,308)
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) 27,768 4,776 21,965
Copper and silver in concentrate [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) 27,765 4,098 20,442
Others [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) $ 3 $ 678 $ 1,523