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Other intangible assets (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of detailed information about intangible assets [abstract]

Schedule of changes in the carrying amount of other intangible assets


										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