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Finance costs and finance income - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 0
Interest on tax claims 0 75 352
Other finance revenues 565 303 155
Reversal of the amortized cost of the syndicated loan, note 16(g) 8,855 0 0
Unrealized change of the fair value related to contingent consideration liability (b) 813 4,382 0
Accrual of other account receivable 72 448 0
Financial obligations amortized costs, note 16(g) (515) (8,837) 361
Finance income before financial obligations amortized costs and unrealized variation of fair value related to contingent consideration liability 4,703 1,122 2,050
Total finance revenues 14,443 5,952 2,411
Finance costs:      
Interest related to senior notes, note 16 31,771 13,343 0
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 0 12,124 0
Interest on commercial obligations 0 0 626
Other 0 0 37
Finance costs before unrealized change of fair value related to contingent consideration liability 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 0
Amortized cost of financial obligations, note 16(g) 515 8,837 0
Accretion expense for leases related to rights in use, note 16(g) 99 176 180
Other finance costs 0 0 155
Unrealized change of the fair value related to contingent consideration liability (b) 0 0 5,690
Financial expenses $ 54,136 $ 60,629 $ 37,822