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Asset Retirement Obligations (Tables)
12 Months Ended
Jun. 30, 2013
Asset Retirement Obligations  
Schedule of reconciliation of the beginning and ending asset retirement obligation
  Year Ended  
 
  2013   2012  

Asset retirement obligations—beginning of period

  $ 968,677   $ 859,586  

Liabilities incurred

    60,143     175,943  

Liabilities settled

    (51,086 )   (61,936 )

Liabilities sold

    (439,927 )    

Accretion

    72,312     77,505  

Revisions to previous estimates

    5,432     (82,421 )
           

Asset retirement obligations—end of period

  $ 615,551   $ 968,677