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5. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Mineral rights	$ 4,438,115	$ 6,131,230
Buildings	61,656,398	68,510,164
Plant and machinery	184,544,140	195,295,877
Motor vehicles	8,282	8,847
Furniture, fixtures and office equipment	4,553,473	4,864,619
Construction in progress	374,790	57,596
Total	255,575,198	274,868,333
Less: Accumulated depreciation and amortization	(146,844,072)	(146,997,010)
Net book value	$ 108,731,126	$ 127,871,323

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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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