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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
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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

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