XML 139 R124.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and contingencies (Details Narrative)
S/ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
PEN (S/)
Dec. 31, 2015
PEN (S/)
Dec. 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of transactions between related parties [line items]          
Annual rent S/ 336 S/ 326 S/ 330    
Payments for development project expenditure S/ 69,732 117,801 490,807    
Peruvian Government [Member]          
Disclosure of transactions between related parties [line items]          
Description of royalty payment

(i) an amount determined in accordance with a statutory scale of rates based on operating profit margin that is applied to the quarterly operating profit, adjusted by certain items, and (ii) 1% of net sales, in each case during the applicable quarter.

        
Royalty expense S/ 841 1,052 743    
Capital Contribution Commitments [Member]          
Disclosure of transactions between related parties [line items]          
Payments for development project expenditure   54,601      
Capital Contribution Commitments [Member] | USD          
Disclosure of transactions between related parties [line items]          
Maximum capital contribution | $         $ 100,000
Mining Royalty Agreement [Member] | Fosfatos del Pacifico S.A. [Member] | Fundacion Comunal San Martin de Sechura and Activos Mineros S.A.C. [Member]          
Disclosure of transactions between related parties [line items]          
Description of royalty payment

Equivalent amount to US$3 for each metric tons of diatomite extracted. The annual royalty may not be less than the equivalent to 40,000 metric tons during the first and second year of production and 80,000 metric tons since the third year of production.

        
Royalty expense   804 S/ 793    
Virrila Concession Non Metallic Mining Activities Agreement [Member] | Third Party [Member]          
Disclosure of transactions between related parties [line items]          
Lease term       30 years  
Description of royalty payment      

Equivalent amount to US$4.50 each for each metric ton of calcareous extracted; the annual royalty may not be less than the equivalent to 850,000 metric tons since the fourth year of production.

  
Royalty expense S/ 3,932 S/ 5,517      
Virrila Concession Non Metallic Mining Activities Agreement [Member] | Third Party [Member] | USD          
Disclosure of transactions between related parties [line items]          
Maximum capital contribution | $       $ 600