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Property, plant and equipment, net (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, plant and equipments,net [Line Items] |  |  |  |
Impairment loss |  | $ 21,620 | $ 0 | $ 3,803
Discount rate used in current estimate of value in use | [1] | 7.10% |  |
Tailing cyclone relocation [Member] |  |  |  |
Property, plant and equipments,net [Line Items] |  |  |  |
Construction in progress |  | $ 47,500 |  |
Mine Maintenance Truck Shop [Member] |  |  |  |
Property, plant and equipments,net [Line Items] |  |  |  |
Construction in progress |  | 38,400 |  |
Komatsu 930E haul trucks [Member] |  |  |  |
Property, plant and equipments,net [Line Items] |  |  |  |
Construction in progress |  | $ 17,100 |  |
Yanacocha mine [Member] |  |  |  |
Property, plant and equipments,net [Line Items] |  |  |  |
Impairment loss |  |  | $ 889,000 |
[1] | The bank accounts and term deposits yield interest at market rates. Because of the short maturity of these balances, less than 90 days, the carrying amounts approximate to their fair value.

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