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Mining concessions, development costs, right-of-use assets, property, plant and equipment, net - Net assets for right in use (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
After-tax discount rate applied to the pre-tax cash flows | 5.25 |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 8.09% |  |  |
Book Value Of Assets Under Finance Lease | $ 187,800,000 |  | $ 313,300,000 |
Acquisition Of Assets Under Lease |  | $ 0 | 0 |
Capitalized finance costs |  | 0 | 0 |
Right-of-use assets | 7,178,000 | 6,185,000 |  |
Additions to right-of-use assets | 6,200,000 | 3,700,000 |  |
Disposal of right of use assets | 1,300,000 | 10,900,000 |  |
Reversal of Impairment loss of long-lived assets, note 11(b) | 2,083,000 | (2,083,000) | 5,693,000 |
Write-off of stripping activity asset | 11,633,000 | 0 | 0 |
Impairment loss |  |  |  | $ 0
Buildings and other constructions |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Right-of-use assets | 3,370,000 | 4,602,000 |  |
Transportation units |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Right-of-use assets | 3,330,000 | 1,112,000 |  |
Machinery and equipment |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Right-of-use assets | $ 478,000 | 471,000 |  |
El Brocal |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
After-tax discount rate applied to the pre-tax cash flows | 7.91 |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 12.18% |  |  |
Goodwill | $ 34,000,000 |  |  |
Stripping activity asset of phase 9 written off | item | 1,102,117 |  |  |
Write-off of stripping activity asset | $ 11,633,000 |  |  |
Stripping activity asset of phase 9 expected to be produced | $ 3,244,000 |  |  |
Stripping activity asset of phase 9 | item | 307,302 |  |  |
La Zanja mining unit [Member] |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
After-tax discount rate applied to the pre-tax cash flows | 5.96 |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 9.19% |  |  |
Reversal of impairment loss recognised in profit or loss, property, plant and equipment |  | 5,700,000 |  |
Shila-Paula mining unit [Member] |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Reversal of impairment loss recognised in profit or loss, property, plant and equipment |  |  | 2,800,000 |
Impairment Of Long Lived Asset [Member] | La Zanja mining unit [Member] |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Reversal of Impairment loss of long-lived assets, note 11(b) |  |  | $ 5,700,000 |
Impairment Of Long Lived Asset [Member] | Julcani Mining Unit [Member] |  |  |  |
Mining concessions, development costs, property, plant and equipment, net |  |  |  |
Provisions | $ 0 |  |  |
Reversal of Impairment loss of long-lived assets, note 11(b) | $ 2,100,000 | $ 2,100,000 |  |

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