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Stockpiles and ore on leach pads, net - Provision for net realizable value (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of stockpiles and ore on leach pads [Line Items]      
Opening balance $ 47,925 $ 89,127 $ 62,540
Provision 37,880 33,464 90,365
Reversal of provision (72,518) (74,666) (63,778)
Ending balance $ 13,287 $ 47,925 $ 89,127