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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
At cost:
Mineral rights	$ 2,985,480	$ 2,955,780
Buildings	64,668,005	64,024,667
Plant and machinery	260,997,193	258,400,710
Motor vehicles	31,724	6,553
Furniture, fixtures and office equipment	3,353,441	3,318,564
Construction in process	23,271,504	12,095,565
Total	355,307,347	340,801,839
Less: Accumulated depreciation and amortization	(183,189,944)	(173,212,554)
Impairment	(18,828,910)	(18,641,596)
Net book value	$ 153,288,493	$ 148,947,689

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