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Inventories (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Inventories Tables        
Goods and finished products S/ 27,386 S/ 21,427 S/ 22,929 S/ 18,951
Work in progress 105,882 107,882 S/ 88,349 S/ 69,711
Raw materials 74,477 71,248    
Packages and packing 1,975 2,045    
Fuel and carbon 26,986 29,033    
Spare parts and supplies 141,623 117,643    
Inventory in transit 4,093 3,941    
Inventories, at fair value less costs to sell 382,422 353,219    
Less - Provision for inventory obsolescence and net realizable value (9,402) (6,684)    
Inventories S/ 373,020 S/ 346,535