XML 110 R95.htm IDEA: XBRL DOCUMENT v3.8.0.1
Exploration, evaluation and intangible assets (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance S/ 2,273,048  
End balance 2,208,553 S/ 2,273,048
Exploration and Evaluation Assets [Member]    
Reconciliation Of Changes In Property, Plant And Equipment [Roll Forward]    
Beginning balance 43,028 81,862
Additions 1,384 10,619 [1]
Transfers 4,419 (1,372)
Amortization 1,437 (451)
Assets held for distribution   (47,630)
End balance S/ 13,416 S/ 43,028
[1] As of December 31, 2016, the exploration and evaluation assets mainly include S/33,469,000 related to brine project, and S/9,559,000 related to others minor projects. As of December 31, 2015, mainly include S/33,469,000 related to brine project, S/40,521,000 related to phosphates project, and S/7,872,000 related to others minor projects.