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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.