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1. BASIS OF PRESENTATION AND CONSOLIDATION (Tables)
6 Months Ended
Jun. 30, 2020
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