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Sales of goods (Details)
S/ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
PEN (S/)
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper $ 274,761   $ 268,527   $ 2,390,840  
Royalty expense (21,526)   (31,217)   (27,611)  
Revenue from sale of goods 1,122,995   1,223,942   1,015,670  
Copper concentrate [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper 2,458,088 S/ 962,113 2,702,508 S/ 979,243 1,967,052 S/ 995,386
Copper cathode [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper 251,908 S/ 86,346 241,725 S/ 84,679 247,431 S/ 109,128
Other primarily silver and molybdenum concentrate [Member]            
Disclosure of Sales of goods [Line Items]            
Revenue from sale of copper $ 351,934   $ 267,033   $ 176,357