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Asset Retirement Obligations (Tables) | 6 Months Ended
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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.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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