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Sales of goods (Details) S/ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 PEN (S/) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 PEN (S/) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 PEN (S/)
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | $ 274,761 |  | $ 268,527 |  | $ 2,390,840 |
Royalty expense | (21,526) |  | (31,217) |  | (27,611) |
Revenue from sale of goods | 1,122,995 |  | 1,223,942 |  | 1,015,670 |
Copper concentrate [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | 2,458,088 | S/ 962,113 | 2,702,508 | S/ 979,243 | 1,967,052 | S/ 995,386
Copper cathode [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | 251,908 | S/ 86,346 | 241,725 | S/ 84,679 | 247,431 | S/ 109,128
Other primarily silver and molybdenum concentrate [Member] |  |  |  |  |  |
Disclosure of Sales of goods [Line Items] |  |  |  |  |  |
Revenue from sale of copper | $ 351,934 |  | $ 267,033 |  | $ 176,357 |

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