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1. BASIS OF PRESENTATION AND CONSOLIDATION (Tables)
3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Property plant and equipment useful life
   

Useful life

(in years)

Buildings (including salt pans)     8 - 20  
Plant and machinery (including protective shells, transmission channels and ducts)     3 - 8  
Motor vehicles     5  
Furniture, fixtures and equipment     3-8