CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Share Issuance Obligation [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Jul. 31, 2015	$ 30,986,665	$ 97,841	$ 222,927,529	$ 0	$ (192,024,074)	$ (14,631)
Balance (in shares) at Jul. 31, 2015		97,834,087
Common stock Issued for equity financing, net of issuance costs	8,365,037	$ 12,365	8,352,672	0	0	0
Common stock Issued for equity financing, net of issuance costs (in shares)		12,364,704
Common stock Issued upon exercise of stock options	$ 225,115	$ 682	224,433	0	0	0
Common stock Issued upon exercise of stock options (in shares)	0	682,167
Common stock Issued for credit facility	$ 1,700,000	$ 1,712	1,698,288	0	0	0
Common stock Issued for credit facility (in shares)		1,711,933
Common stock Issued for asset acquisition	1,226,875	$ 1,334	1,225,541	0	0	0
Common stock Issued for asset acquisition (in shares)		1,333,560
Common stock Issued for settlement of liabilities	453,444	$ 487	452,957	0	0	0
Common stock Issued for settlement of liabilities (in shares)		487,574
Stock-based compensation Common stock issued for consulting services	1,372,381	$ 1,429	1,370,952	0	0	0
Stock-based compensation Common stock issued for consulting services (in shares)		1,429,650
Stock-based compensation Common stock issued under Stock Incentive Plan	726,244	$ 820	725,424	0	0	0
Stock-based compensation Common stock issued under Stock Incentive Plan (in shares)		826,782
Stock-based compensation Amortization of stock option expenses	985,538	$ 0	985,538	0	0	0
Warrants Issued for equity financing	1,619,480	0	1,619,480	0	0	0
Warrants Extension for credit facility	104,915	0	104,915	0	0	0
Warrants Extension for mineral property	14,155	0	14,155	0	0	0
Net loss for the year	(17,329,872)	0	0	0	(17,329,872)	0
Other comprehensive loss	(99)	0	0	0	0	(99)
Balance at Jul. 31, 2016	30,449,878	$ 116,670	239,701,884	0	(209,353,946)	(14,730)
Balance (in shares) at Jul. 31, 2016		116,670,457
Common stock Issued for equity financing, net of issuance costs	19,421,351	$ 17,331	19,404,020	0	0	0
Common stock Issued for equity financing, net of issuance costs (in shares)		17,330,836
Common stock Issued upon exercise of stock options	56,925	$ 266	56,659	0	0	0
Common stock Issued upon exercise of stock options (in shares)		264,727
Common stock Issued upon exercise of warrants	2,387,660	$ 1,989	2,385,671	0	0	0
Common stock Issued upon exercise of warrants (in shares)		1,989,717
Common stock Issued for credit facility	1,100,000	$ 739	1,099,261	0	0	0
Common stock Issued for credit facility (in shares)		738,503
Common stock Issued for property acquisition	87,617	$ 62	87,555	0	0	0
Common stock Issued for property acquisition (in shares)		61,939
Common stock Issued for advance royalty payment	48,672	$ 46	48,626	0	0	0
Common stock Issued for advance royalty payment(in shares)		46,800
Common stock Issued for settlement of liabilities	1,524,650	$ 1,016	1,523,634	0	0	0
Common stock Issued for settlement of liabilities (in shares)		1,015,940
Stock-based compensation Common stock issued for consulting services	1,107,937	$ 862	1,107,075	0	0	0
Stock-based compensation Common stock issued for consulting services (in shares)		865,386
Stock-based compensation Common stock issued under Stock Incentive Plan	1,584,394	$ 834	945,418	638,142	0	0
Stock-based compensation Common stock issued under Stock Incentive Plan (in shares)		830,819
Stock-based compensation Amortization of stock option expenses	1,313,289	$ 0	1,313,289	0	0	0
Warrants Issued for equity financing	4,409,570	0	4,409,570	0	0	0
Warrants Issued for equity financing as issuance costs	614,490	0	614,490	0	0	0
Net loss for the year	(17,971,056)	0	0	0	(17,971,056)	0
Other comprehensive loss	28	0	0	0	0	28
Balance at Jul. 31, 2017	46,135,405	$ 139,815	272,697,152	638,142	(227,325,002)	(14,702)
Balance (in shares) at Jul. 31, 2017		139,815,124
Common stock Issued upon exercise of stock options	530,050	$ 1,095	528,955	0	0	0
Common stock Issued upon exercise of stock options (in shares)		1,094,589
Common stock Issued upon exercise of warrants	74,159	$ 62	74,097	0	0	0
Common stock Issued upon exercise of warrants (in shares)		61,799
Common stock Issued for credit facility	900,000	$ 641	899,359	0	0	0
Common stock Issued for credit facility (in shares)		641,574
Common stock Issued for Reno Creek Acquisition	20,332,617	$ 14,853	20,317,764	0	0	0
Common stock Issued for Reno Creek Acquisition (in shares)		14,852,450
Common stock Issued for North Reno Creek Acquisition	2,722,856	$ 1,691	2,721,165	0	0	0
Common stock Issued for North Reno Creek Acquisition (in shares)		1,691,215
Common stock Issued for Reimbursable Expenses for Reno Creek Acquisition	483,829	$ 353	483,476	0	0	0
Common stock Issued for Reimbursable Expenses for Reno Creek Acquisition (in shares)		353,160
Common stock Issued for Diabase Acquisition	232,321	$ 165	232,156	0	0	0
Common stock Issued for Diabase Acquisition (in shares)		164,767
Common stock Issued for advance royalty payment	61,820	$ 46	61,774	0	0	0
Common stock Issued for advance royalty payment(in shares)		46,134
Common stock Issued for settlement of liabilities	845,824	$ 566	845,258	0	0	0
Common stock Issued for settlement of liabilities (in shares)		565,499
Stock-based compensation Common stock issued for consulting services	349,834	$ 225	349,609	0	0	0
Stock-based compensation Common stock issued for consulting services (in shares)		225,168
Stock-based compensation Common stock issued under Stock Incentive Plan	1,711,579	$ 1,664	2,348,057	(638,142)	0	0
Stock-based compensation Common stock issued under Stock Incentive Plan (in shares)		1,664,285
Stock-based compensation Amortization of stock option expenses	1,414,629	$ 0	1,414,629	0	0	0
Warrants Issued in connection with Reno Creek Acquisition	5,088,928	0	5,088,928	0	0	0
Net loss for the year	(17,826,634)	0	0	0	(17,826,634)	0
Other comprehensive loss	118,343	0	0	0	0	118,343
Balance at Jul. 31, 2018	$ 63,175,560	$ 161,176	$ 308,062,379	$ 0	$ (245,151,636)	$ 103,641
Balance (in shares) at Jul. 31, 2018		161,175,764