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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Mineral rights	$ 2,805,348	$ 2,809,977
Buildings	60,766,201	60,866,462
Plant and machinery	201,039,726	161,178,816
Motor vehicles	6,219	6,230
Furniture, fixtures and office equipment	3,283,592	3,289,010
Construction in progress	12,352,571	6,535,808
Total	280,253,657	234,686,303
Less: Accumulated depreciation and amortization	(141,263,815)	(134,681,628)
Impairment	(17,692,851)	(17,722,045)
Net book value	$ 121,296,991	$ 82,282,630

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Vehicles Gross

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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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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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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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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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