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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Mineral rights $ 6,470,836 $ 6,530,158
Buildings 52,858,833 53,343,419
Plant and machinery 171,267,783 172,842,611
Motor vehicles 9,337 9,423
Furniture, fixtures and office equipment 4,858,090 4,902,627
Total 235,464,879 237,628,238
Less: Accumulated depreciation and amortization (103,991,981) (91,227,802)
Net book value $ 131,472,898 $ 146,400,436