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Finance costs and finance revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finance revenues:      
Interest on time deposits $ 5,176 $ 1,050 $ 358
Interests on tax claims 1,701 153 487
Interests on third parties loans 561 813 489
Interests on loans to associates, note 30(a) 92 1,685 4,164
Dividends income 0 0 589
Income from financial instruments 0 0 743
Other finance revenues 341 43 0
Finance income before unrealized variation of fair value related to contingent consideration liability 7,871 3,744 6,830
Unrealized variation of the fair value related to contingent consideration liability (b) 1,815 1,773 0
Total finance revenues 9,686 5,517 6,830
Finance costs:      
Interest on borrowings 31,538 27,052 18,668
Banking expenses 729 552 319
Tax on financial transactions 173 180 159
Interest on loans 2 1,056 4,643
Increase in debt issuance costs, note 16(f) 0 480 0
Interest on commercial obligations 0 5 496
Other finance costs 6,492 10,934 1,880
Finance costs before unrealized variation of fair value related to contingent consideration liability 32,450 29,332 25,115
Accrual of the present value for mine closure, note 15(b) 4,982 4,382 4,116
Accrual of debt issuance costs, note 16(f) 1,024 909 0
Unrealized variation of the fair value related to contingent consideration liability (b) 0 0 2,349
Finance costs $ 38,456 $ 34,623 $ 31,580