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Asset Retirement Obligations - Summary of Asset Retirement Obligations (Details) - USD ($)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of the beginning and ending asset retirement obligation    
Asset retirement obligations—beginning of period $ 1,422,955 $ 1,288,743
Liabilities incurred 31,268 44,700
Accretion of discount 101,506 90,290
Revisions to previous estimates 55,116 (778)
Asset retirement obligations—ending of period 1,610,845 1,422,955
Less: current asset retirement obligations (50,244) (35,539)
Long-term portion of asset retirement obligations $ 1,560,601 $ 1,387,416