Condensed Consolidated Statement of Changes In Stockholders' Equity (Unaudited) - 9 months ended Jan. 31, 2019 - USD ($)	Series C Preferred Stock [Member]	Series E Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Apr. 30, 2018			$ 17,591	$ 30,911,222	$ (18,228,552)	$ 12,700,261
Balance, shares at Apr. 30, 2018			17,590,574
Issuance of common stock for cash, net of issuance costs			$ 235	178,637		178,872
Issuance of common stock for cash, net of issuance costs, shares			235,071
Issuance of common stock for salaries			$ 91	99,090		100,000
Issuance of common stock for salaries, shares			91,268
Issuance of common stock for exploration expenses			$ 199	183,027		183,226
Issuance of common stock for exploration expenses, shares			199,159
Issuance of common stock for services			$ 1,000	852,232		853,232
Issuance of common stock for services, shares			1,000,000
Issuance of common stock for accrued services			$ 9	12,491		$ 12,500
Issuance of common stock for accrued services, shares			9,191			9,191
Issuance of options for services				205,726		$ 205,726
Net loss - For the nine months ended January 31, 2019					(6,555,305)	(6,555,305)
Balance at Jan. 31, 2019			$ 19,125	$ 32,443,244	$ (24,783,857)	$ 7,678,512
Balance, shares at Jan. 31, 2019			19,125,263