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Property, plant and equipment (Tables)
6 Months Ended
Jun. 30, 2012
Property Plant and Equipment

As of June 30, 2012 and December 31, 2011, property, plant and equipment consisted of the following:

 

    June 30,
2012
    December 31,
2011
 
Property, Plant, and Equipment:                
Land use rights   $ 9,886,149     $ 2,358,862  
Building and improvements     17,874,450       11,145,342  
Machinery and equipment     125,529,788       122,844,563  
Vehicles     418,215       233,217  
Construction in progress     4,263,022       2,335,579  
      157,971,624       138,917,563  
Less accumulated depreciation and amortization     (28,463,115 )     (24,266,456 )
Property, Plant and Equipment, net   $ 129,508,509     $ 114,651,107