Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Reno Creek Project [Member] Common Stock [Member]	Reno Creek Project [Member] Additional Paid-in Capital [Member]	Reno Creek Project [Member] Share Issuance Obligation [Member]	Reno Creek Project [Member] Retained Earnings [Member]	Reno Creek Project [Member] AOCI Attributable to Parent [Member]	Reno Creek Project [Member]	Diabase Project [Member] Common Stock [Member]	Diabase Project [Member] Additional Paid-in Capital [Member]	Diabase Project [Member] Share Issuance Obligation [Member]	Diabase Project [Member] Retained Earnings [Member]	Diabase Project [Member] AOCI Attributable to Parent [Member]	Diabase Project [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Share Issuance Obligation [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Jul. 31, 2017													139,815,124
Balance at Jul. 31, 2017													$ 139,815	$ 272,697,152	$ 638,142	$ (227,325,002)	$ (14,702)	$ 46,135,405
Issued upon exercise of stock options (in shares)													908,178
Issued upon exercise of stock options													$ 909	327,391				328,300
Issued for credit facility (in shares)													641,574
Issued for credit facility													$ 641	899,359				900,000
Common stock issued for consulting services (in shares)													208,889
Common stock issued for consulting services													$ 208	322,657				322,865
Common stock issued under Stock Incentive Plan (in shares)													1,023,247
Common stock issued under Stock Incentive Plan													$ 1,023	1,366,763	(638,142)			729,644
Amortization of stock option expenses														1,052,833				1,052,833
Net loss for the period																(13,056,299)		(13,056,299)
Other comprehensive loss																	388	388
Issued for acquisitions (in shares)	14,852,450						164,767
Issued for acquisitions	$ 14,853	$ 20,317,764				$ 20,332,617	$ 165	$ 232,156				$ 232,321
Issued for Reimbursable Expenses for Reno Creek Acquisition (in shares)													353,160
Issued for Reimbursable Expenses for Reno Creek Acquisition													$ 353	483,476				483,829
Issued for mineral property (in shares)													46,134
Issued for mineral property													$ 46	61,774				61,820
Issued for settlement of liabilities (in shares)													469,358
Issued for settlement of liabilities													$ 470	698,491				698,961
Issued in connection with Reno Creek Acquisition														5,088,928				5,088,928
Balance (in shares) at Apr. 30, 2018													158,482,881
Balance at Apr. 30, 2018													$ 158,483	303,548,744		(240,381,301)	(14,314)	$ 63,311,612
Balance (in shares) at Jul. 31, 2018													161,175,764					161,175,764
Balance at Jul. 31, 2018													$ 161,176	308,062,379		(245,151,636)	103,641	$ 63,175,560
Issued for equity financing, net of issuance costs (in shares)													12,613,049
Issued for equity financing, net of issuance costs													$ 12,613	15,978,349				$ 15,990,962
Issued upon exercise of stock options (in shares)													118,985					217,750
Issued upon exercise of stock options													$ 119	72,244				$ 72,363
Issued upon exercise of warrants (in shares)													3,999,881
Issued upon exercise of warrants													$ 4,000	4,818,357				$ 4,822,357
Issued in exchange of warrants pursuant to Securities Exchange Agreement (in shares)													750,000					750,000
Issued in exchange of warrants pursuant to Securities Exchange Agreement													$ 750	976,813				$ 977,563
Issued for credit facility (in shares)													1,180,328
Issued for credit facility													$ 1,180	1,398,820				1,400,000
Common stock issued for consulting services (in shares)													165,404
Common stock issued for consulting services													$ 163	226,376				226,539
Common stock issued under Stock Incentive Plan (in shares)													558,875
Common stock issued under Stock Incentive Plan													$ 561	784,556				785,117
Amortization of stock option expenses														1,141,733				1,141,733
Issued for equity financing														2,978,250				2,978,250
Exchanged for common stock pursuant to Securities Exchange Agreement														(4,950,000)				(4,950,000)
Difference from Securities Exchange Agreement														3,952,500				3,952,500
Net loss for the period																(10,818,657)		(10,818,657)
Reclassification upon adoption of ASU No. 2016-01																103,641	(103,641)
Other comprehensive loss																	(121,722)	$ (121,722)
Balance (in shares) at Apr. 30, 2019													180,562,286					180,562,286
Balance at Apr. 30, 2019													$ 180,562	$ 335,440,377		$ (255,866,652)	$ (121,722)	$ 79,632,565