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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2021
Classes of current inventories [abstract]  
Schedule of Inventories
 
  
December 31, 2021
US$‘000
    
December 31, 2020
US$‘000
  
Raw materials and consumables
     13,650       12,168  
Work-in-progress
     5,546       5,169  
Finished goods
     9,927       12,882  
 
                
 
     29,123       30,219  
Schedule of Movement on Inventory Provision
The movement on the inventory provision for the three year period to December 31, 2021 is as follows:
 
 
  
December 31,
2021
US$‘000
    
December 31,
2020
US$‘000
    
December 31,
2019
US$‘000
  
Opening provision at January 1
     9,781       6,716       6,299  
Charged during the year
     5,589       5,179       1,567  
Utilised during the year
     (3,307
)
     (1,994
)
     (1,150
)
Released during the year
     -       (120
)
     -  
 
                        
Closing provision at December 31
     12,063       9,781       6,716