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Other assets, net
 12 Months Ended
Dec. 31, 2018
Other Assets Noncurrents [Abstract]  
Other assets, net
12.
Other assets, net
 
 
(a)
Below is presented the movement:
 
 
 
Balance as of
January 1,
2017
 
 
Additions
 
 
Balance as of

December 31,

2017
 
 
Additions
 
 
Transfers
 
 
Balance as of

December 31,

2018
 
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
US$(000)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Patents and industrial property (b)
 
 
9,558
 
 
 
4,122
 
 
 
13,680
 
 
 
2,642
 
 
 
(4,599
)
 
 
11,723
 
Software licenses
 
 
6,457
 
 
 
2,359
 
 
 
8,816
 
 
 
1,448
 
 
 
(96
)
 
 
10,168
 
Rights of use
 
 
7,331
 
 
 
522
 
 
 
7,853
 
 
 
4,439
 
 
 
-
 
 
 
12,292
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
23,346
 
 
 
7,003
 
 
 
30,349
 
 
 
8,529
 
 
 
(4,695
)
 
 
34,183
 
Accumulated amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Software licenses
 
 
1,995
 
 
 
383
 
 
 
2,378
 
 
 
596
 
 
 
-
 
 
 
2,974
 
Rights of use
 
 
3,632
 
 
 
1,578
 
 
 
5,210
 
 
 
738
 
 
 
-
 
 
 
5,948
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5,627
 
 
 
1,961
 
 
 
7,588
 
 
 
1,334
 
 
 
-
 
 
 
8,922
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net cost
 
 
17,719
 
 
 
 
 
 
 
22,761
 
 
 
 
 
 
 
 
 
 
 
25,261
 
 
 
(b)
The copper plant project is a technological initiative of the Company to develop a viable technical and economic solution for the treatment of complex copper concentrates. This project comprises several stages of development from a laboratory level, pilot to a demonstration stage.