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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
At cost: |  |
Mineral rights | $ 3,025,017 | $ 2,955,780
Buildings | 34,906,137 | 64,024,667
Plant and machinery | 201,012,254 | 258,400,710
Motor vehicles | 139,563 | 6,553
Furniture, fixtures and office equipment | 2,494,400 | 3,318,564
Construction in process | 44,310,149 | 12,095,565
Total | 285,887,520 | 340,801,839
Less: Accumulated depreciation and amortization | (123,229,974) | (173,212,554)
Impairment | 0 | (18,641,596)
Net book value | $ 162,657,546 | $ 148,947,689

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