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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 |  |

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