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Stockpiles and ore on leach pads, net (Details 1) - Minera Yanacocha SRL and subsidiary [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of stockpiles and ore on leach pads [Line Items] |  |  |
Opening balance | $ 84,374 | $ 90,298 | $ 163,094
Provision | 77,385 | 100,179 | 64,497
Reversal of provision | (99,219) | (106,103) | (137,293)
Ending balance | $ 62,540 | $ 84,374 | $ 90,298

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