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Exploration, evaluation and intangible assets (Details Narrative) - Exploration and Evaluation Assets [Member] - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Additions S/ 1,384 S/ 10,619 [1]
Brine project [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Additions S/ 33,469 33,469
Others Minor Projects [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Additions   S/ 9,559
[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.