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INVENTORIES
 12 Months Ended
Dec. 31, 2020
Classes of current inventories [abstract]  
INVENTORIES
17.
INVENTORIES
 
 
  
December 31, 2020
US$‘000
    
December 31, 2019
US$‘000
  
Raw materials and consumables
    
12,168
      
12,654
  
Work-in-progress
    
5,169
      
6,940
  
Finished goods
    
12,882
      
12,427
  
 
                
 
    
30,219
      
32,021
  

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$9,781,000 (2019: US$6, 716,000). Cost of sales in 2020 includes inventories expensed of US$48,342,000 (2019: US$50,748,000), (2018: US$55,285,000).
 
The movement on the inventory provision for the three year period to December 31, 2020 is as follows:
 
 
  
December 31,
2020
US$‘000
    
December 31,
2019
US$‘000
    
December 31,
2018
US$‘000
  
Opening provision at January 1
    
6,716
      
6,299
      
7,543
  
Charged during the year
    
5,179
      
1,567
      
480
  
Utilised during the year
    
(1,994
)
    
(1,150
)
    
(1,544
)
Released during the year
    
(120
)
    
-
      
(180
)
 
                        
Closing provision at December 31
    
9,781
      
6,716
      
6,299
  

During 2020, US$120,000 (2019: US$Nil), (2018: US$180,000) of inventory provision relating to net realisable value was released to the statement of operations following a current year review of inventory usage.