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Mining concessions, development costs, property, plant and equipment, net (Details Textual)
 12 Months Ended
Dec. 31, 2018
USD ($)
MT
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Pre-tax discount rate applied to the pre-tax cash flows 7.29%    
Capitalized finance costs   $ 5,800,000  
Average rate used to determine the financial cost to be capitalized 4.19%    
Reversal of impairment loss $ 0 (11,770,000) $ 0
Stripping activity asset of ore | MT 5.5    
Stripping activity asset of waste | MT 9.2    
El Brocal [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Pre-tax discount rate applied to the pre-tax cash flows 13.32%    
Buenaventura [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Pre-tax discount rate applied to the pre-tax cash flows 7.83%    
Mining activities [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss   11,800,000  
Mining activities [Member] | Breapampa [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss $ 7,400,000    
Mining activities [Member] | Recuperada [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss 7,100,000    
Mining activities [Member] | Shila Paula [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss 2,700,000    
La Zanja mining unit [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss recognised in profit or loss, property, plant and equipment 5,693,000 $ 21,620,000  
Shila-Paula mining unit [Member]      
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items]      
Reversal of impairment loss recognised in profit or loss, property, plant and equipment $ 2,800,000