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Finance costs and finance income - (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance revenues:      
Interest on time deposits $ 1,074,000 $ 4,971,000 $ 5,176,000
Interests on third parties loans 355,000 460,000 561,000
Interests on tax claims 352,000 16,000 1,701,000
Interests on loans to related parties, note 30(a) 114,000 86,000 92,000
Dividends income 0 3,625,000 0
Other minor 155,000 517,000 340,000
Finance income before financial obligations amortized costs and unrealized variation of fair value related to contingent consideration liability 2,050,000 9,675,000 7,870,000
Financial obligations amortized costs 361,000 0 0
Unrealized change of the fair value related to contingent consideration liability (b) 0 0 1,815,000
Total finance revenues 2,411,000 9,675,000 9,685,000
Finance costs:      
Interest on borrowings 19,249,000 28,418,000 31,538,000
Commission for restructuring financial obligations, note 16 3,929,000 0 0
Interest on commercial obligations 626,000 0 0
Settlement of hedging financial instruments, note 32(b) 146,000 0 0
Tax on financial transactions 107,000 166,000 173,000
Interest on loans 55,000 1,000 2,000
Other minor 37,000 141,000 703,000
Finance costs before unrealized change of fair value related to contingent consideration liability 24,149,000 28,726,000 32,416,000
Accretion expense for mine closure, note 15(b) 6,672,000 10,390,000 4,982,000
Unrealized change of the fair value related to contingent consideration liability (b) 5,690,000 655,000 0
Accrual of debt issuance costs, note 16(f) 976,000 2,109,000 1,024,000
Accretion expense for leases related to rights in use 180,000 293,000 0
Other minor 155,000 0 0
Financial expenses $ 37,822,000 $ 42,173,000 $ 38,422,000