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Stockpiles and ore on leach pads, net (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current portion -    
Stockpiles $ 35,065 $ 77,296
Ore on leach pads 106,931 159,930
Provision for net realizable value adjustment (41,403) (40,588)
Current ore stockpiles 100,593 196,638
Non-current portion -    
Stockpiles 41,814 32,362
Ore on leach pads 144,688 50,350
Provision for net realizable value adjustment (47,724) (21,952)
Non-current ore stockpiles $ 138,778 $ 60,760