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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
At cost: |  |
Mineral rights | $ 3,037,938 | $ 3,025,017
Buildings | 35,055,241 | 34,906,137
Plant and machinery | 201,702,769 | 201,012,254
Motor vehicles | 140,159 | 139,563
Furniture, fixtures and office equipment | 2,505,055 | 2,494,400
Construction in process | 68,574,529 | 44,310,149
Total | 311,015,691 | 285,887,520
Less: Accumulated depreciation and amortization | (128,599,846) | (123,229,974)
Impairment | 0 | 0
Net book value | $ 182,415,845 | $ 162,657,546

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