Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligation - Schedule of Asset Retirement Obligation (Details)

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Asset Retirement Obligation - Schedule of Asset Retirement Obligation (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Apr. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]      
Balance, beginning of period $ 88,746
Addition and changes in estimates   81,885
Accretion expense 2,140 $ 1,254 6,861
Balance, end of period $ 90,886   $ 88,746