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Other payables and accrued liabilities (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Other payables and accrued liabilities [Abstract]    
Accrued electricity $ 292,812 $ 314,598
Accrued professional fees 74,000 58,000
Value-added tax payable 371,527   
Accrued interest 496,205 269,019
Payable for purchase of equipment 271,718 936,908
Insurance premium payable 112,903   
Others 48,731 11,016
Totals $ 1,667,896 $ 1,589,541