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Mining concessions, development costs, right-of-use assets, property, plant and equipment, net - Net assets for right in use (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
T
Dec. 31, 2017
USD ($)
Mining concessions, development costs, property, plant and equipment, net      
After-tax discount rate applied to the pre-tax cash flows 4.88    
Pre-tax discount rate applied to the pre-tax cash flows 6.92%    
Book Value Of Assets Under Finance Lease $ 313,300 $ 337,300  
Acquisition Of Assets Under Lease 0 0  
Capitalized finance costs 0 $ 0  
Right-of-use assets 6,185    
Additions to right-of-use assets 3,700    
Disposal of right of use assets 10,900    
Stripping activity asset of ore | T   5.50  
Stripping activity asset of waste | T   9.20  
Write-off of stripping activity asset 0 $ 0 $ 13,573
Buildings      
Mining concessions, development costs, property, plant and equipment, net      
Right-of-use assets 4,602    
Transportation units      
Mining concessions, development costs, property, plant and equipment, net      
Right-of-use assets 1,112    
Machinery and equipment      
Mining concessions, development costs, property, plant and equipment, net      
Right-of-use assets $ 471    
El Brocal [Member]      
Mining concessions, development costs, property, plant and equipment, net      
After-tax discount rate applied to the pre-tax cash flows 7.02    
Pre-tax discount rate applied to the pre-tax cash flows 9.95%    
Goodwill $ 34,000    
Mining activities [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Reversal of impairment loss   11,800  
Mining activities [Member] | Breapampa [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Reversal of impairment loss   7,400  
Mining activities [Member] | Recuperada [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Reversal of impairment loss   7,100  
Mining activities [Member] | Shila Paula [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Reversal of impairment loss   2,700  
La Zanja mining unit [Member]      
Mining concessions, development costs, property, plant and equipment, net      
After-tax discount rate applied to the pre-tax cash flows 5.15    
Pre-tax discount rate applied to the pre-tax cash flows 7.31%    
Reversal of impairment loss recognised in profit or loss, property, plant and equipment   5,700 $ 21,600
Shila-Paula mining unit [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Reversal of impairment loss recognised in profit or loss, property, plant and equipment   $ 2,800  
Impairment Of Long Lived Asset [Member] | La Zanja mining unit [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Provisions $ 0    
Impairment Of Long Lived Asset [Member] | Julcani Mining Unit [Member]      
Mining concessions, development costs, property, plant and equipment, net      
Provisions $ 2,100