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Asset Retirement Obligations (Tables)
6 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of reconciliations of the beginning and ending asset retirement obligation balances
The following is a reconciliation of the beginning and ending asset retirement obligations for the six months ended December 31, 2019 and for the year ended June 30, 2019:
 
December 31,
2019
 
June 30,
2019
Asset retirement obligations — beginning of period
$
1,610,845

 
$
1,422,955

Liabilities incurred
903,580

(a)
31,268

Liabilities settled
(50,610
)
 

Liabilities sold

 

Accretion of discount
62,430

 
101,506

Revision of previous estimates
(32,504
)
 
55,116

Asset retirement obligations — end of period
$
2,493,741

 
$
1,610,845

Less current portion in accrued liabilities

 
(50,244
)
Long-term portion of asset retirement obligations
$
2,493,741

 
$
1,560,601

 
(a) Liabilities incurred in fiscal 2020 were due to our acquisition of our Hamilton Dome interest.