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Corporate information (Details 3) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assets -    
Property, plant and equipment, note 10 S/ 2,208,553 S/ 2,273,048
Exploration and evaluation assets, note 11 13,416 43,028
Other current liabilities 5,137 6,640
Additional paid in capital 432,779 545,165
Total impairment 47,582
Impairment on Brine Project [Member]    
Assets -    
Income tax prepayments (5,654)  
Property, plant and equipment, note 10 (1,732)  
Exploration and evaluation assets, note 11 (33,469)  
Other current liabilities 32  
Additional paid in capital (6,759)  
Total impairment (47,582)  
Income tax 10,150  
Total (37,432)  
Attributable to -    
Equity holders of the parent (25,444)  
Non controlling interests (11,988)  
Impairment loss (37,432)  
Impairment on Brine Project [Member] | Cementos Pacasmayo S.A.A. [Member]    
Assets -    
Income tax prepayments  
Property, plant and equipment, note 10  
Exploration and evaluation assets, note 11  
Other current liabilities  
Additional paid in capital (6,759)  
Total impairment (6,759)  
Income tax 17,087  
Total 10,328  
Attributable to -    
Equity holders of the parent 10,328  
Non controlling interests  
Impairment loss 10,328  
Impairment on Brine Project [Member] | Salmueras Sudamericanas S.A. [Member]    
Assets -    
Income tax prepayments (5,654)  
Property, plant and equipment, note 10 (1,732)  
Exploration and evaluation assets, note 11 (33,469)  
Other current liabilities 32  
Additional paid in capital  
Total impairment (40,823)  
Income tax (6,937)  
Total (47,760)  
Attributable to -    
Equity holders of the parent (35,772)  
Non controlling interests (11,988)  
Impairment loss S/ (47,760)