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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Mineral rights	$ 6,506,668us-gaap_MineralPropertiesGross	$ 6,530,158us-gaap_MineralPropertiesGross
Buildings	53,231,127us-gaap_BuildingsAndImprovementsGross	53,343,419us-gaap_BuildingsAndImprovementsGross
Plant and machinery	177,485,689us-gaap_PropertyPlantAndEquipmentOther	172,842,611us-gaap_PropertyPlantAndEquipmentOther
Motor vehicles	9,389gure_VehiclesGross	9,423gure_VehiclesGross
Furniture, fixtures and office equipment	4,884,991us-gaap_FurnitureAndFixturesGross	4,902,627us-gaap_FurnitureAndFixturesGross
Total	242,117,864us-gaap_PropertyPlantAndEquipmentGross	237,628,238us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization	(117,767,083)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(91,227,802)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net book value	$ 124,350,781us-gaap_PropertyPlantAndEquipmentNet	$ 146,400,436us-gaap_PropertyPlantAndEquipmentNet

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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 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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