4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Mineral rights	$ 2,764,462	$ 2,809,977
Buildings	59,880,567	60,866,462
Plant and machinery	234,669,007	161,178,816
Motor vehicles	6,129	6,230
Furniture, fixtures and office equipment	3,235,736	3,289,010
Construction in progress	1,204,742	6,535,808
Total	301,760,643	234,686,303
Less: accumulated depreciation and amortization	(146,330,705)	(134,681,628)
Impairment	(17,434,989)	(17,722,045)
Net book value	$ 137,994,949	$ 82,282,630

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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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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