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Finance costs and finance income - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance revenues:      
Interest on time deposits $ 4,971 $ 5,176 $ 1,050
Dividends income 3,625 0 0
Interests on third parties loans 460 561 813
Interests on loans to related parties, note 30(a) 86 92 1,685
Interests on tax claims 16 1,701 153
Other minor 517 340 43
Finance income before unrealized variation of fair value related to contingent consideration liability 9,675 7,870 3,744
Unrealized variation of the fair value related to contingent consideration liability (b) 0 1,815 1,773
Total finance revenues 9,675 9,685 5,517
Finance costs:      
Interest on borrowings 28,418 31,538 28,019
Tax on financial transactions 166 173 180
Interest on loans 1 2 1,053
Other minor 55 703 72
Accretion expense for mine closure, note 15(b) 10,390 4,982 4,318
Accrual of debt issuance costs, note 16(f) 2,109 1,024 909
Unrealized variation of the fair value related to contingent consideration liability (b) 655 0 0
Finance costs before unrealized variation of fair value related to contingent consideration liability 28,640 32,416 29,324
Accretion expense of leases liability 379 0 0
Finance costs $ 42,173 $ 38,422 $ 34,551