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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2018
Classes of current inventories [abstract]  
Schedule of Inventories
 
  
December 31, 2018
US$‘000
    
December 31, 2017
US$‘000
  
Raw materials and consumables
    
10,556
      
10,345
  
Work-in-progress
    
8,239
      
7,236
  
Finished goods
    
11,564
      
15,224
  
 
                
 
    
30,359
      
32,805
  
 
Schedule of Movement on Inventory Provision
The movement on the inventory provision for the three year period to December 31, 2018 is as follows:
 
 
  
December 31,
2018
US$‘000
    
December 31,
2017
US$‘000
    
December 31,
2016
US$‘000
  
Opening provision at January 1
    
7,543
      
10,017
      
4,822
  
Charged during the year
    
480
      
2,561
      
6,390
  
Utilised during the year
    
(1,544
)
    
(4,749
)
    
(1,065
)
Released during the year
    
(180
)
    
(286
)
    
(130
)
 
                        
Closing provision at December 31
    
6,299
      
7,543
      
10,017