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1. NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 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

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