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Finance costs and finance income (Tables) | 12 Months Ended
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Dec. 31, 2022
Finance costs and finance income |
Disclosure Of Detailed Information About Finance Cost And Finance Revenues [Text Block] |
| (a) | This caption is made up as follows:
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​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | US$(000) | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​ | ​ | ​
Finance revenues: | ​ | ​ | ​ | ​ | ​ | ​
Interest on time deposits |  | 3,521 |  | 338 |  | 1,074
Interests on third party loans | ​ | 449 | ​ | 203 | ​ | 355
Interest on loans to related parties, note 32(a) |  | 94 |  | 89 |  | 114
Interest from financial instruments | ​ | 74 | ​ | 114 | ​ | —
Interest on tax claims |  | — |  | 75 |  | 352
Other finance revenues |  | 565 |  | 303 |  | 155
​ |  | 4,703 |  | 1,122 |  | 2,050
Reversal of the amortized cost of the syndicated loan, note 16(g) | ​ | 8,855 | ​ | — | ​ | —
Unrealized change of the fair value related to contingent consideration liability (b) |  | 813 |  | 4,382 |  | —
Accrual of other account receivable |  | 72 |  | 448 |  | —
Financial obligations amortized costs, note 16(g) | ​ | — | ​ | — | ​ | 361
Total finance revenues | ​ | 14,443 | ​ | 5,952 | ​ | 2,411
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | US$(000) | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​ | ​ | ​
Finance costs: | ​ | ​ | ​ | ​ | ​ | ​
Interest related to senior notes, note 16 |  | 31,771 |  | 13,343 |  | —
Interest on borrowings and loans, note 16 | ​ | 10,865 | ​ | 17,166 | ​ | 23,178
Settlement of hedging financial instruments, note 34(c) |  | 818 |  | 1,547 |  | 146
Tax on financial transactions |  | 189 |  | 193 |  | 107
Interest on loans |  | 26 |  | 43 |  | 55
Commissions for bond letters issued to SUNAT | ​ | — | ​ | 12,124 | ​ | —
Interest on commercial obligations | ​ | — | ​ | — | ​ | 626
Other finance costs |  | — |  | — |  | 37
​ |  | 43,669 |  | 44,416 |  | 24,149
Accretion expense for mine closure and exploration projects, note 15(b) |  | 5,070 |  | 5,598 |  | 6,672
Accrual of debt issuance costs, note 16(g) |  | 2,820 |  | 885 |  | 976
Accrual of costs for bond issuance, note 16(g) |  | 1,963 |  | 717 |  | —
Amortized cost of financial obligations, note 16(g) | ​ | 515 | ​ | 8,837 | ​ | —
Accretion expense for leases related to rights in use, note 16(g) | ​ | 99 | ​ | 176 | ​ | 180
Unrealized change of the fair value related to contingent consideration liability (b) |  | — |  | — |  | 5,690
Other finance costs | ​ | — | ​ | — | ​ | 155
​ | ​ | 54,136 | ​ | 60,629 | ​ | 37,822
​
Schedule of contingent liabilities in business combination | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | US$(000) | ​ | US$(000) | ​ | US$(000)
​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance |  | 17,718 |  | 22,100 |  | 16,410
​ | ​ | ​ | ​ | ​ | ​ | ​
Variation of the fair value in profit and loss |  | (813) |  | (4,382) |  | 5,690
Ending balance |  | 16,905 |  | 17,718 |  | 22,100
​
Schedule of significant unobservable valuation input | Significant unobservable valuation inputs are provided below: ​
​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021
​ | ​ | ​ | ​ | ​
Annual average of future sales of mineral (US$000) |  | 208,912 |  | 193,972
Useful life of mining properties |  | 14 |  | 14
Pre-tax discount rate (%) |  | 13.2 |  | 9.7
​

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