4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Mineral rights	$ 2,955,780	$ 2,764,462
Buildings	64,024,667	59,880,567
Plant and machinery	258,400,710	234,669,007
Motor vehicles	6,553	6,129
Furniture, fixtures and office equipment	3,318,564	3,235,736
Construction in progress	12,095,565	1,204,742
Total	340,801,839	301,760,643
Less: accumulated depreciation and amortization	(173,212,554)	(146,330,705)
Impairment	(18,641,596)	(17,434,989)
Net book value	$ 148,947,689	$ 137,994,949

No definition available.

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- Definition

Vehicles Gross

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No definition available.

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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- Definition

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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- Definition

Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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- Definition

Carrying amount at the balance sheet date of mineral properties, gross of adjustments.

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No definition available.

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale.

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