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Finance costs and finance revenues (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Finance costs and finance revenues [Abstract]  
Disclosure Of Detailed information about Finance cost and Finance revenues [Text Block]
 
(a)
Finance costs and finance revenues:
 
 
 
2018
 
 
2017
 
 
2016
 
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
 
 
 
 
 
 
 
 
 
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
 
 
-
 
 
 
-
 
 
 
589
 
Income from financial instruments
 
 
-
 
 
 
-
 
 
 
743
 
Other finance revenues
 
 
341
 
 
 
43
 
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7,871
 
 
 
3,744
 
 
 
6,830
 
Unrealized variation of the fair value related to contingent consideration liability (b)
 
 
1,815
 
 
 
1,773
 
 
 
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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)
 
 
-
 
 
 
480
 
 
 
-
 
Interest on commercial obligations
 
 
-
 
 
 
5
 
 
 
496
 
Other finance costs
 
 
8
 
 
 
7
 
 
 
830
 
 
 
 
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
 
 
 
-
 
Unrealized variation of the fair value related to contingent consideration liability (b)
 
 
-
 
 
 
-
 
 
 
2,349
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total finance costs
 
 
38,456
 
 
 
34,623
 
 
 
31,580
 
Disclosure of contingent liabilities in business combination [text block]
A reconciliation of fair value measurement of the contingent consideration liability is provided below:
 
 
 
2018
 
 
2017
 
 
2016
 
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
 
 
17,570
 
 
 
19,343
 
 
 
16,994
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Variation of the fair value in results, note 27(a)
 
 
(1,815
)
 
 
(1,773
)
 
 
2,349
 
Final balance
 
 
15,755
 
 
 
17,570
 
 
 
19,343
 
Disclosure Of significant unobservable valuation inputs [Text Block]
Significant unobservable valuation inputs are provided below:
 
 
 
2018
 
 
2017
 
 
 
 
 
 
 
 
Annual average of future sales of mineral (US$000)
 
 
196,801
 
 
 
193,588
 
Useful life of mining properties
 
 
13
 
 
 
13
 
Pre-tax discount rate (%)
 
 
10
 
 
 
10