Consolidated Statements of Stockholders' Equity - USD ($)	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Share Issuance Obligation [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [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)							1,094,589					1,365,625
Issued upon exercise of stock options							$ 1,095	528,955				$ 530,050
Issued upon exercise of warrants (in shares)							61,799
Issued upon exercise of warrants							$ 62	74,097				$ 74,159
Issued for credit facility (in shares)							641,574					641,574
Issued for credit facility							$ 641	899,359				$ 900,000
Issued in connection with mineral property acquisitions (in shares)							17,061,592
Issued in connection with mineral property acquisitions							$ 17,062	23,754,561				23,771,623
Issued for advance royalty payment (in shares)							46,134
Issued for advance royalty payment							$ 46	61,774				61,820
Issued for settlement of liabilities (in shares)							565,499
Issued for settlement of liabilities							$ 566	845,258				845,824
Common stock issued for consulting services (in shares)							225,168
Common stock issued for consulting services							$ 225	349,609				349,834
Common stock issued under Stock Incentive Plan (in shares)							1,664,285
Common stock issued under Stock Incentive Plan							$ 1,664	2,348,057	(638,142)			1,711,579
Amortization of stock-based compensation								1,414,629				1,414,629
Issued for consulting services, warrants								5,088,928				5,088,928
Net loss for the year										(17,826,634)		(17,826,634)
Other comprehensive income											118,343	118,343
Balance (in shares) at Jul. 31, 2018							161,175,764
Balance at Jul. 31, 2018				$ 103,641	$ (103,641)		$ 161,176	308,062,379		(245,151,636)	103,641	$ 63,175,560
Issued upon exercise of stock options (in shares)							125,879					259,625
Issued upon exercise of stock options							$ 126	72,237				$ 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 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)							886,126
Common stock issued under Stock Incentive Plan							$ 888	1,173,956	187,100			1,361,944
Amortization of stock-based compensation								1,359,558				1,359,558
Net loss for the year										(17,152,789)		(17,152,789)
Other comprehensive income											12,461	12,461
Issued for equity financing, net of issuance costs (in shares)							12,613,049
Issued for equity financing, net of issuance costs							$ 12,613	15,978,348				$ 15,990,961
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	976,814				$ 977,564
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
Balance (in shares) at Jul. 31, 2019							180,896,431
Balance at Jul. 31, 2019							$ 180,896	336,047,595	187,100	(262,200,784)	12,461	$ 74,227,268
Issued for credit facility (in shares)							1,743,462					1,743,462
Issued for credit facility							$ 1,743	1,398,257				$ 1,400,000
Common stock issued for consulting services (in shares)							380,933
Common stock issued for consulting services							$ 381	350,696				351,077
Common stock issued under Stock Incentive Plan (in shares)							1,509,200
Common stock issued under Stock Incentive Plan							$ 1,510	1,308,507	(187,100)			1,122,917
Amortization of stock-based compensation								2,085,491				2,085,491
Issued for consulting services, warrants								22,733				22,733
Net loss for the year										(14,610,516)		(14,610,516)
Other comprehensive income											(132,705)	(132,705)
Issued (accrued) upon vesting of RSUs and PRSUs (in shares)							105,844
Issued (accrued) upon vesting of RSUs and PRSUs							$ 106	(153,307)	103,554			(49,647)
Balance (in shares) at Jul. 31, 2020							184,635,870
Balance at Jul. 31, 2020							$ 184,636	$ 341,059,972	$ 103,554	$ (276,811,300)	$ (120,244)	$ 64,416,618