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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of stockpiles and ore on leach pads [Line Items]
Opening balance	$ 89,127	$ 62,540	$ 84,374
Provision	33,464	90,365	77,385
Reversal of provision	(74,666)	(63,778)	(99,219)
Ending balance	$ 47,925	$ 89,127	$ 62,540