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Property Plant and Equipment Net (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
At cost:    
Mineral rights $ 6,294,862 $ 6,318,750
Buildings 40,819,625 40,974,528
Plant and machinery 134,002,545 136,862,383
Motor vehicles 6,998 7,024
Furniture, fixtures and office equipment 4,042,017 4,057,356
Construction in progress 7,849,287  
Total 193,015,334 188,220,041
Less: Accumulated depreciation and amortization (50,518,857) (41,019,301)
Net book value $ 142,496,477 $ 147,200,740