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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    As of December 31,  
    2012     2011  
At cost:            
Mineral rights   $ 6,334,277     $ 6,318,750  
Buildings     50,905,337       40,974,528  
Plant and machinery     166,121,329       136,862,383  
Motor vehicles     9,140       7,024  
Furniture, fixtures and office equipment     4,777,044       4,057,356  
Total     228,147,127       188,220,041  
Less: accumulated depreciation and amortization     (62,204,585 )     (41,019,301 )
Net book value   $ 165,942,542     $ 147,200,740