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Stockpiles and ore on leach pads, net (Details) - Minera Yanacocha SRL and subsidiary [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current portion -    
Stockpiles $ 77,296 $ 92,309
Current ore on leach pads 159,930 209,471
Provision for net realizable value adjustment (40,588) (75,423)
Current ore stockpiles 196,638 226,357
Non-current portion -    
Stockpiles 32,362 41,997
Ore on leach pads 50,350 78,843
Provision for net realizable value adjustment (21,952) (8,951)
Non-current ore stockpiles $ 60,760 $ 111,889