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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventories  
Schedule of inventories

 

 

 
  December 31,  
 
  2011   2010  

Coal

  $ 180,537   $ 69,110  

Raw materials and supplies

    59,900     28,521  
           

Total inventories

  $ 240,437   $ 97,631