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Commitments and contingencies (Details 1) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of contingent liabilities [line items]      
Year expense S/ 437 S/ 576 S/ 456
Rioja [Member]      
Disclosure of contingent liabilities [line items]      
Resource
Limestone
    
Resolution Number   OF.28-2002-MITINCI  
Year of approval   2002  
Program approved   EAMP  
Year expense S/ 236 S/ 409 255
Tembladera [Member]      
Disclosure of contingent liabilities [line items]      
Resource
Limestone
    
Resolution Number   RD.019-97-EM/DGM  
Year of approval   1997  
Program approved   EAMP  
Year expense S/ 201 S/ 167 S/ 201