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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Mineral rights	$ 4,638,854	$ 4,438,115
Buildings	66,796,949	63,601,451
Plant and machinery	191,789,494	183,243,077
Motor vehicles	8,656	8,282
Furniture, fixtures and office equipment	4,086,312	3,909,483
Construction in progress	0	374,790
Total	267,320,265	255,575,198
Less: Accumulated depreciation and amortization	(169,696,997)	(146,844,072)
Net book value	$ 97,623,268	$ 108,731,126

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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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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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