Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Preferred Stock - Series C [Member]	Preferred Stock - Series E [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Apr. 30, 2017	$ 45		$ 6,932	$ 15,813,297	$ (4,570,057)	$ 11,250,217
Balance, shares at Apr. 30, 2017	45,002		6,932,059
Recapitalization of the company			$ 1,205	5,660,730		5,661,935
Recapitalization of the company, shares			1,204,667
Issuance of common stock for cash, net of offering cost			$ 1,568	2,588,436		2,590,004
Issuance of common stock for cash, net of offering cost, shares			1,568,100
Issuance of preferred stock and warrants for cash		$ 3		4,916,117		4,916,120
Issuance of preferred stock and warrants for cash, shares		2,500
Issuance of common stock for the acquisition of mineral rights			$ 15	35,835		35,850
Issuance of common stock for the acquisition of mineral rights, shares			15,000
Issuance of common stock for services			$ 702	1,142,127		1,142,829
Issuance of common stock for services, shares			700,483
Issuance of common stock for prepaid services			$ 117	280,708		280,825
Issuance of common stock for prepaid services, shares			117,500
Conversion of preferred stock into common stock	$ (45)	$ (3)	$ 7,000	(6,952)
Conversion of preferred stock into common stock, shares	(45,002)	(2,500)	7,000,180
Issuance of common stock for accrued services			$ 52	137,448		137,500
Issuance of common stock for accrued services, shares			52,585
Stock options granted for services				174,835		174,835
Issuance of options for prepaid services				168,641		168,641
Net loss					(13,658,495)	(13,658,495)
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 offering cost			$ 290	219,506		219,796
Issuance of common stock for cash, net of offering cost, shares			290,066
Issuance of common stock for services			$ 1,202	1,186,798		1,188,000
Issuance of common stock for services, shares			1,201,874
Issuance of common stock for accrued services			$ 9	12,491		12,500
Issuance of common stock for accrued services, shares			9,191
Stock options granted for services				328,082		328,082
Issuance of common stock for salaries			$ 570	566,930		567,500
Issuance of common stock for salaries, shares			569,761
Issuance of common stock for exploration expenses			$ 199	183,027		183,226
Issuance of common stock for exploration expenses, shares			199,159
Net loss					(8,046,550)	(8,046,550)
Balance at Apr. 30, 2019			$ 19,861	$ 33,408,056	$ (26,275,102)	$ 7,152,815
Balance, shares at Apr. 30, 2019			19,860,625