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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2019
Classes of current inventories [abstract]  
Schedule of 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
  
 
Schedule of Movement on Inventory Provision
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