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Other assets, net (Tables) | 12 Months Ended
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Dec. 31, 2020
Other assets, net |
Schedule of other assets, net | (a)Below is presented the movement:
|  | Balance as of |  |  |  |  |  | Balance as of |  |  |  |  |  | Balance as of
|  | January 1, |  |  |  |  |  | December 31, |  |  |  |  |  | December 31,
|  | 2019 |  | Additions |  | Transfers |  | 2019 |  | Additions |  | Disposals |  | 2020
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000)
Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and industrial property (b) |  | 11,723 |  | 2,139 |  | — |  | 13,862 |  | 1,014 |  | (167) |  | 14,709
Rights-of-use (c) |  | 12,292 |  | 1,319 |  | — |  | 13,611 |  | 109 |  | — |  | 13,720
Software licenses |  | 10,168 |  | 242 |  | (92) |  | 10,318 |  | 518 |  | (22) |  | 10,814
|  | 34,183 |  | 3,700 |  | (92) |  | 37,791 |  | 1,641 |  | (189) |  | 39,243
Accumulated amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights-of-use (c) |  | 5,948 |  | 1,486 |  | — |  | 7,434 |  | 731 |  | — |  | 8,165
Software licenses |  | 2,974 |  | 820 |  | (112) |  | 3,682 |  | 897 |  | (4) |  | 4,575
|  | 8,922 |  | 2,306 |  | (112) |  | 11,116 |  | 1,628 |  | (4) |  | 12,740
Cost net |  | 25,261 |  |  |  |  |  | 26,675 |  |  |  |  |  | 26,503
(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. (c)Corresponds to the mineral servitude agreements signed with the communities surrounding the Group's operations, through which the Group is authorized to carry out exploration, development, exploitation and general work activities.

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