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Other intangible assets | 12 Months Ended
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Dec. 31, 2018
Disclosure of detailed information about intangible assets [abstract] |
Other intangible assets | 8. Other intangible assets Changes in the carrying amount of other intangible assets during the years ended December 31 are as follows:
|  |  |  |  |  |  |  |  |  | Other |  | Accumulated |  |  |  |
|  | Development |  | Power Supply |  |  |  | Computer |  | Intangible |  | Depreciation |  | Impairment |  |
|  | Expenditure |  | Agreements |  | Rights of Use |  | Software |  | Assets |  | (Note 25.3) |  | (Note 25.5) |  | Total
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Balance at January 1, 2017 |  | 40,354 |  | 37,836 |  | 20,345 |  | 5,815 |  | 21,784 |  | (54,629) |  | (8,666) |  | 62,839
Additions |  | 260 |  | — |  | 55 |  | — |  | 14,472 |  | (8,440) |  | (443) |  | 5,904
Disposals |  | — |  | — |  | — |  | (10) |  | (14,294) |  | 565 |  | — |  | (13,739)
Transfers from/(to) other accounts |  | 4,044 |  | — |  | — |  | — |  | (150) |  | (3,894) |  | — |  | —
Exchange differences |  | 5,824 |  | — |  | 2,639 |  | 242 |  | 2,451 |  | (6,353) |  | (1,149) |  | 3,654
Balance at December 31, 2017 |  | 50,482 |  | 37,836 |  | 23,039 |  | 6,047 |  | 24,263 |  | (72,751) |  | (10,258) |  | 58,658
Additions |  | 992 |  | — |  | — |  | — |  | 26,385 |  | (9,312) |  | (16,073) |  | 1,992
Disposals |  | — |  | — |  | — |  | (64) |  | (7,260) |  | — |  | — |  | (7,324)
Business combinations (Note 5) |  | — |  | — |  | — |  | 45 |  | — |  | — |  | — |  | 45
Transfers from/(to) other accounts |  | 1,919 |  | — |  | — |  | — |  | (1,919) |  | — |  | — |  | —
Exchange differences |  | (2,408) |  | — |  | (648) |  | (101) |  | (1,656) |  | 2,546 |  | 718 |  | (1,549)
Balance at December 31, 2018 |  | 50,985 |  | 37,836 |  | 22,391 |  | 5,927 |  | 39,813 |  | (79,517) |  | (25,613) |  | 51,822
Additions and disposals in other intangible asset in 2018 and 2017 primarily relate to the acquisition, use and expiration of rights held to emit greenhouse gasses by certain Spanish, French and Canadian subsidiaries (see Note 4.20). As a result of the Business Combination, the Company acquired a power supply agreement which provides favorable below-market power rates to the Alloy, West Virginia facility, which terminates in December 2021. During 2018 the Company recognised an impairment of $13,947 thousand of development expenditures in relation to our solar-grade silicon metal project based in Puertollano, Spain. Refer to Note 9 for further details. At December 31, 2018, the Company has other intangible assets of $26,948 thousand, pledged as security for outstanding bank loans and other payables.

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- Definition The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118&doctype=Standard -URIDate 2018-03-16 + Details
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