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Mining concessions, development costs, property, plant and equipment, net (Details Textual) | 12 Months Ended
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Dec. 31, 2017 USD ($) MT | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 8.33% |  |
Property, plant and equipment | $ 1,949,555,000 | $ 1,960,025,000 | $ 1,747,624,000
Capitalized finance costs | $ 6,300,000 | $ 7,500,000 |
Average rate used to determine the financial cost to be capitalized | 4.19% | 3.52% |
Reversal of impairment loss | $ (11,770,000) | $ 0 | 0
Other reserves | $ 269,000 | 269,000 |
Stripping activity asset of ore | MT | 5.5 |  |
Stripping activity asset of waste | MT | 9.2 |  |
El Brocal [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 5.89% |  |
Buenaventura [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 9.30% |  |
Mining activities [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Reversal of impairment loss | $ 11,770,000 |  |
Mining activities [Member] | Breapampa [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Reversal of impairment loss | 7,400,000 |  |
Mining activities [Member] | Recuperada [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Reversal of impairment loss | 7,100,000 |  |
Mining activities [Member] | Shila Paula [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Reversal of impairment loss | 2,700,000 |  |
La Zanja mining unit [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | 21,620,000 |  | 3,803,000
Breapampa mining unit [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  | $ 7,452,000
Shila-Paula mining unit [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  | 2,043,000 |
Property, plant and equipment under operating leases [member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Additions |  | $ 0 |
Capitalized finance costs | $ 0 |  |

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