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Stockpiles and ore on leach pads, net | 12 Months Ended
--- | ---
Dec. 31, 2017
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of stockpiles and ore on leach pads [Line Items] |
Disclosure of stockpiles and ore on leach pads [Text Block] |
8. | Stockpiles and ore on leach pads, net
| (a) | This caption is made up as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Current portion - |  |  |  |  |  |  |
Stockpiles |  |  | 77,296 |  |  | 92,309 |
Ore on leach pads |  |  | 159,930 |  |  | 209,471 |
Provision for net realizable value adjustment (b) |  |  | (40,588) |  |  | (75,423) |
|  |  | 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 (b) |  |  | (21,952) |  |  | (8,951) |
|  |  | 60,760 |  |  | 111,889 |
| (b) | The provision for net realizable value adjustment had the following movement during the years 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Opening balance, note 16 |  |  | 84,374 |  |  | 90,298 |  |  | 163,094 |
Provision |  |  | 77,385 |  |  | 100,179 |  |  | 64,497 |
Reversal of provision |  |  | (99,219) |  |  | (106,103) |  |  | (137,293) |
Ending balance, note 16 |  |  | 62,540 |  |  | 84,374 |  |  | 90,298 |

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