17.	INVENTORIES

	December 31, 2019 US$‘000		December 31, 2018 US$‘000
Raw materials and consumables		12,654		10,556
Work-in-progress		6,940		8,239
Finished goods		12,427		11,564

		32,021		30,359

All inventories are stated at the lower of cost or net realisable value. The replacement cost of inventories does not differ from cost. Total inventories for the Group are shown net of provisions of US$6,716,000 (2018: US$6,299,000). Cost of sales in 2019 includes inventories expensed of US$50,748,000 (2018: US$55,285,000), (2017: US$54,904,000).

The movement on the inventory provision for the three year period to December 31, 2019 is as follows:

	December 31, 2019 US$‘000			December 31, 2018 US$‘000			December 31, 2017 US$‘000
Opening provision at January 1		6,299			7,543			10,017
Charged during the year		1,567			480			2,561
Utilised during the year		(1,150	)		(1,544	)		(4,749	)
Released during the year		-			(180	)		(286	)

Closing provision at December 31		6,716			6,299			7,543

During 2019, US$Nil (2018: US$180,000), (2017: US$286,000) of inventory provision relating to net realisable value was released to the statement of operations following a current year review of inventory usage.