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v3.19.1

Property, plant and equipment, net (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Property, plant and equipments,net [Line Items] |  |  |
Impairment loss | $ 21,620 | $ 0 |
Discount rate used in current estimate of value in use |  |  | 7.10%
Yanacocha mine [Member] |  |  |
Property, plant and equipments,net [Line Items] |  |  |
Impairment loss |  | $ 889,000 |

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