Commitments and Contingencies - Schedule of Right and Option to Earn-in and Acquire Undivided Interest (Details)	6 Months Ended
	Oct. 31, 2020 USD ($)
Initial earn in amount	$ 4,500,000
First Agreement Year [Member]
Initial earn in amount	0
Second Agreement Year [Member]
Initial earn in amount	300,000
Third Agreement Year [Member]
Initial earn in amount	500,000
Fourth Agreement Year [Member]
Initial earn in amount	700,000
Fifth Agreement Year [Member]
Initial earn in amount	1,000,000
Sixth Agreement Year [Member]
Initial earn in amount	1,000,000
Seventh Agreement Year [Member]
Initial earn in amount	$ 1,000,000