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Finance costs and finance income - (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finance revenues:      
Interest on time deposits $ 338,000 $ 1,074,000 $ 4,971,000
Interests on third parties loans 203,000 355,000 460,000
Interests from financial instruments 114,000 0 0
Interests on loans to related parties, note 32(a) 89,000 114,000 86,000
Interests on tax claims 75,000 352,000 16,000
Other 303,000 155,000 280,000
Finance income before financial obligations amortized costs and unrealized variation of fair value related to contingent consideration liability 1,122,000 2,050,000 5,813,000
Unrealized change of the fair value related to contingent consideration liability (b) 4,382,000 0 0
Accrual of other account receivable 448,000 0 237,000
Financial obligations amortized costs, note 16(g) (8,837,000) 361,000 0
Total finance revenues 5,952,000 2,411,000 6,050,000
Finance costs:      
Interest on borrowings 17,166,000 23,178,000 28,418,000
Interest related to senior notes 13,343,000 0 0
Commissions for bond letters issued to SUNAT 12,124,000 0 0
Settlement of hedging financial instruments, note 34(c) 1,547,000 146,000 0
Tax on financial transactions 193,000 107,000 166,000
Interest on loans 43,000 55,000 1,000
Interest on commercial obligations   626,000 0
Other   37,000 141,000
Finance costs before unrealized change of fair value related to contingent consideration liability 44,416,000 24,149,000 28,726,000
Amortized cost of financial obligations, note 16(g) 8,837,000 0 0
Accretion expense for mine closure, note 15(b) 5,598,000 6,672,000 10,390,000
Accrual of debt issuance costs, note 16(g) 885,000 976,000 2,109,000
Accrual of costs for bond issuance, note 16(g) 717,000 0 0
Accretion expense for leases related to rights in use, note 16(g) 176,000 180,000 293,000
Unrealized change of the fair value related to contingent consideration liability (b)   5,690,000 655,000
Other   155,000 0
Financial expenses $ 60,629,000 $ 37,822,000 $ 42,173,000