CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Apr. 30, 2017 - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Jul. 31, 2016	$ 30,449,878	$ 116,670	$ 239,701,884	$ (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
Common stock Issued for equity financing, net of issuance costs (in shares)		17,330,836
Common stock Issued for exercise of stock options	54,600	$ 252	54,348	0	0
Common stock Issued for exercise of stock options (in shares)		251,050
Common stock issued for exercise of warrants	1,944,804	$ 1,620	1,943,184	0	0
Common stock issued for exercise of warrants (in shares)		1,620,670
Common stock Issued for credit facility	1,100,000	$ 739	1,099,261	0	0
Common stock Issued for credit facility (in shares)		738,503
Common stock Issued for property acquisition	71,500	$ 50	71,450	0	0
Common stock Issued for property acquisition (in shares)		50,000
Common stock Issued for mineral property	48,672	$ 46	48,626	0	0
Common stock Issued for mineral property (in shares)		46,800
Common stock Issued for settlement of current liabilities	175,060	$ 152	174,908	0	0
Common stock Issued for settlement of current liabilities (in shares)		151,679
Stock-based compensation Common stock issued for consulting services	694,170	$ 557	693,613	0	0
Stock-based compensation Common stock issued for consulting services (in shares)		559,623
Stock-based compensation Common stock issued under Stock Incentive Plan	725,364	$ 673	724,691	0	0
Stock-based compensation Common stock issued under Stock Incentive Plan (in shares)		670,425
Stock-based compensation Stock options issued to consultants	303,047	$ 0	303,047	0	0
Stock-based compensation Stock options issued to management	430,218	0	430,218	0	0
Stock-based compensation Stock options issued to employees	329,379	0	329,379	0	0
Warrants Issued for equity financing	4,409,570	0	4,409,570	0	0
Warrants Issued for equity financing as issuance costs	614,490	0	614,490	0	0
Net loss for the period	(12,383,927)	0	0	(12,383,927)	0
Other comprehensive loss	(26)	0	0	0	(26)
Balance at Apr. 30, 2017	$ 48,388,150	$ 138,090	$ 270,002,689	$ (221,737,873)	$ (14,756)
Balance (in shares) at Apr. 30, 2017		138,090,043