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Related party disclosure (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income      
Income from office lease S/ 682 S/ 700 S/ 664
Fees for management and administrative services (1,560) (1,103) (505)
Inversiones ASPI S.A. (ASPI) [Member]      
Income      
Income from office lease 12 13 12
Fees for management and administrative services 595 1,095 497
Other      
Investments shares 48,585
Servicios Corporativos Pacasmayo S.A.C. (Sercopa) [Member]      
Income      
Income from office lease 3 13 12
Fees for management and administrative services 2 8 8
Compania Minera Ares S.A.C. (Ares) [Member]      
Income      
Income from land rental services 336 326 330
Income from office lease 315 348 310
Expense      
Security services provided by Compania Minera Ares 1,195 1,301 1,146
Fossal S.A.A. (Fossal) [Member]      
Income      
Income from office lease 16
Fees for management and administrative services 46
Other      
Investments shares 21,206
Fosfatos del Pacifico S.A. (Fospac) [Member]      
Income      
Income from office lease 40
Fees for management and administrative services S/ 917