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Deferred income tax
 12 Months Ended
Dec. 31, 2018
Disclosure of Deferred income tax [Abstract]  
Disclosure of deferred taxes [text block]
28.
Deferred income tax
 
 
(a)
The Group recognizes the effects of timing differences between the accounting and tax basis. This caption is made up as follows:
 
 
 
As of

January 1,

2017
 
 
Credit (debit) to the

Consolidated  

statement of profit

 or loss
 
 
Credit (debit)  to

consolidated  

 statements of other

comprehensive

income
 
 
As of

December 31,

 2017
 
 
Credit (debit) to the

Consolidated  

statement of profit

 or loss
 
 
Credit (debit)  to

consolidated  

 statements of other

comprehensive

income
 
 
Others

movements
 
 
As of 

December 31,

 2018
 
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred asset for income tax included in results
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tax - loss carryforward
 
 
93,050
 
 
 
1,889
 
 
 
-
 
 
 
94,939
 
 
 
11,680
 
 
 
-
 
 
 
(396
)
 
 
106,223
 
Difference in depreciation and amortization rates
 
 
60,883
 
 
 
734
 
 
 
-
 
 
 
61,617
 
 
 
6,497
 
 
 
-
 
 
 
-
 
 
 
68,114
 
Provision for closure of mining units, net
 
 
39,538
 
 
 
5,030
 
 
 
-
 
 
 
44,568
 
 
 
3,291
 
 
 
-
 
 
 
-
 
 
 
47,859
 
Impairment loss of long-lived assets
 
 
7,592
 
 
 
2,328
 
 
 
-
 
 
 
9,920
 
 
 
(2,448
)
 
 
-
 
 
 
-
 
 
 
7,472
 
Other minor
 
 
14,650
 
 
 
809
 
 
 
-
 
 
 
15,459
 
 
 
5,369
 
 
 
-
 
 
 
(146
)
 
 
20,682
 
 
 
 
215,713
 
 
 
10,790
 
 
 
-
 
 
 
226,503
 
 
 
24,389
 
 
 
-
 
 
 
(542
)
 
 
250,350
 
Less - Allowance for deferred asset
 
 
(37,012
)
 
 
(1,898
)
 
 
-
 
 
 
(38,910
)
 
 
(2,038
)
 
 
-
 
 
 
-
 
 
 
(40,948
)
 
 
 
178,701
 
 
 
8,892
 
 
 
-
 
 
 
187,593
 
 
 
22,351
 
 
 
-
 
 
 
(542
)
 
 
209,402
 
Deferred asset included in retained earnings
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative financial instruments
 
 
1,140
 
 
 
-
 
 
 
7,963
 
 
 
9,103
 
 
 
-
 
 
 
(9,103
)
 
 
-
 
 
 
-
 
 
 
 
179,841
 
 
 
8,892
 
 
 
7,963
 
 
 
196,696
 
 
 
22,351
 
 
 
(9,103
)
 
 
(542
)
 
 
209,402
 
Deferred assets for mining royalties and special mining tax included in results
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other minors
 
 
43
 
 
 
80
 
 
 
-
 
 
 
123
 
 
 
(87
)
 
 
-
 
 
 
-
 
 
 
36
 
 
 
 
43
 
 
 
80
 
 
 
-
 
 
 
123
 
 
 
(87
)
 
 
-
 
 
 
-
 
 
 
36
 
Total deferred asset
 
 
179,884
 
 
 
8,972
 
 
 
7,963
 
 
 
196,819
 
 
 
22,264
 
 
 
(9,103
)
 
 
(542
)
 
 
209,438
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred liability for income tax included in results
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Differences in amortization rates for development costs
 
 
(51,788
)
 
 
6,095
 
 
 
-
 
 
 
(45,693
)
 
 
(20,295
)
 
 
-
 
 
 
-
 
 
 
(65,988
)
Effect of translation into U.S. dollars
 
 
(70,525
)
 
 
24,502
 
 
 
-
 
 
 
(46,023
)
 
 
(15,248
)
 
 
-
 
 
 
-
 
 
 
(61,271
)
Other minors
 
 
(43,985
)
 
 
(33,618
)
 
 
-
 
 
 
(77,603
)
 
 
3,123
 
 
 
-
 
 
 
-
 
 
 
(74,480
)
 
 
 
(166,298
)
 
 
(3,021
)
 
 
-
 
 
 
(169,319
)
 
 
(32,420
)
 
 
-
 
 
 
-
 
 
 
(201,739
)
Deferred liability for mining royalties and special mining tax included in results
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative financial instruments
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(813
)
 
 
-
 
 
 
(813
)
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
(813
)
 
 
-
 
 
 
(813
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred assets for mining royalties and special mining tax
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other minors
 
 
(35
)
 
 
(126
)
 
 
-
 
 
 
(161
)
 
 
158
 
 
 
-
 
 
 
-
 
 
 
(2
)
 
 
 
(35
)
 
 
(126
)
 
 
-
 
 
 
(161
)
 
 
158
 
 
 
-
 
 
 
-
 
 
 
(2
)
Total deferred liability
 
 
(166,333
)
 
 
(3,147
)
 
 
-
 
 
 
(169,480
)
 
 
(32,262
)
 
 
(813
)
 
 
-
 
 
 
(202,554
)
Deferred income tax asset, net
 
 
13,551
 
 
 
5,825
 
 
 
7,963
 
 
 
27,339
 
 
 
(9,998
)
 
 
(9,916
)
 
 
(542
)
 
 
6,883
 
 
 
(b)
The deferred tax asset is presented in the consolidated statement of financial position:
 
 
 
2018
 
 
2017
 
 
 
US$(000)
 
 
US$(000)
 
 
 
 
 
 
 
 
Deferred income tax asset, net
 
 
38,305
 
 
 
43,129
 
Deferred income tax liability, net
 
 
(31,422
)
 
 
(15,790
)
 
 
 
 
 
 
 
 
 
 
 
 
6,883
 
 
 
27,339