Fair value measurement (Table)

12 Months Ended

Dec. 31, 2017

The following table provides the fair value measurement hierarchy of the Group’s assets and liabilities:

			Fair value measurement using
			Quoted prices		Quoted prices		Quoted prices
			in active		in active		in active
			markets		markets		markets
	Total		(Level 1)		(Level 2)		(Level 3)
	US$(000)		US$(000)		US$(000)		US$(000)
As of December 31, 2017
Assets and liabilities measured at fair value:
- Embedded derivatives for concentrates sales, net		7,424		-		7,424		-
- Contingent consideration liability		17,570		-		-		17,570
- Hedge instruments		28,705		-		28,705		-
As of December 31, 2016
Liabilities measured at fair value:
- Embedded derivatives for concentrates sales, net		1,524		-		1,524		-
- Contingent consideration liability		19,343		-		-		19,343
- Hedge instruments		3,863		-		3,863		-