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Net sales - Other operating revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) $ 14,715 $ (1,308) $ (13,230)
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) 4,776 21,965 21,870
Sales of copper and silver [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) 4,098 20,442 17,509
Others [Member] | Minera Yanacocha SRL and subsidiary [Member]      
Disclosure Of Net Sales [Line Items]      
Other operating income (expense) $ 678 $ 1,523 $ 4,361