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Finance costs and finance income (Tables) | 12 Months Ended
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Dec. 31, 2020
Finance costs and revenues [Line Items] |
Disclosure Of Detailed Information About Finance Cost And Finance Revenues [Text Block] | Finance costs and finance income (a)This caption is made up as follows:
|  | 2020 |  | 2019 |  | 2018
|  | US$(000) |  | US$(000) |  | US$(000)
Interest on time deposits |  | 1,074 |  | 4,971 |  | 5,176
Interests on third parties loans |  | 355 |  | 460 |  | 561
Interests on tax claims |  | 352 |  | 16 |  | 1,701
Interests on loans to related parties, note 30(a) |  | 114 |  | 86 |  | 92
Dividends income |  | — |  | 3,625 |  | —
Other minor |  | 155 |  | 517 |  | 340
|  | 2,050 |  | 9,675 |  | 7,870
Financial obligations amortized costs, note 16(f) |  | 361 |  | — |  | —
Unrealized change of the fair value related to contingent consideration liability (b) |  | — |  | — |  | 1,815
Total finance revenues |  | 2,411 |  | 9,675 |  | 9,685
Finance costs: |  |  |  |  |  |
Interest on borrowings |  | 19,249 |  | 28,418 |  | 31,538
Commission for restructuring financial obligations, note 16 |  | 3,929 |  | — |  | —
Interest on commercial obligations |  | 626 |  | — |  | —
Settlement of hedging financial instruments, note 32(b) |  | 146 |  | — |  | —
Tax on financial transactions |  | 107 |  | 166 |  | 173
Interest on loans |  | 55 |  | 1 |  | 2
Other minor |  | 37 |  | 141 |  | 703
|  | 24,149 |  | 28,726 |  | 32,416
Accretion expense for mine closure, note 15(b) |  | 6,672 |  | 10,390 |  | 4,982
Unrealized change of the fair value related to contingent consideration liability (b) |  | 5,690 |  | 655 |  | —
Accrual of debt issuance costs, note 16(f) |  | 976 |  | 2,109 |  | 1,024
Accretion expense for leases related to rights in use, nota 16(f) |  | 180 |  | 293 |  | —
Other minor |  | 155 |  | — |  | —
|  | 37,822 |  | 42,173 |  | 38,422
Schedule of contingent liabilities in business combination |
| (c) |  | A reconciliation of fair value measurement of the contingent consideration liability is provided below:
|  | 2020 |  | 2019 |  | 2018
|  | US$(000) |  | US$(000) |  | US$(000)
Beginning balance |  | 16,410 |  | 15,755 |  | 17,570
Variation of the fair value in profit and loss |  | 5,690 |  | 655 |  | (1,815)
Final balance |  | 22,100 |  | 16,410 |  | 15,755
Schedule of significant unobservable valuation input | Significant unobservable valuation inputs are provided below:
|  | 2020 |  | 2019
Annual average of future sales of mineral (US$000) |  | 222,238 |  | 190,815
Useful life of mining properties |  | 14 |  | 14
Pre-tax discount rate (%) |  | 9.30 |  | 10.00
Minera Yanacocha SRL and subsidiary [Member] |
Finance costs and revenues [Line Items] |
Schedule of Finance cost | This caption is made up as follows:
|  | 2020 |  | 2019 |  | 2018
|  | US$(000) |  | US$(000) |  | US$(000)
Unwinding of the discount of the provision for mining closure, note 12(b) |  | 32,049 |  | 36,709 |  | 36,015
Commissions of guarantee letters |  | 3,153 |  | 2,485 |  | 2,113
Unwinding of debt instruments, note 14 |  | 1,497 |  | 1,497 |  | 735
Interests on tax contingency and others, see note 23 |  | — |  | 16,938 |  | 161
|  | 36,699 |  | 57,629 |  | 39,024

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