CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 9 months ended Apr. 30, 2016 - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Jul. 31, 2015	$ 30,986,665	$ 97,841	$ 222,927,529	$ (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	9,984,517	$ 12,365	9,972,152	0	0
Common stock Issued for equity financing, net of issuance costs (in shares)		12,364,704
Common stock Issued for exercise of stock options	225,115	$ 682	224,433	0	0
Common stock Issued for exercise of stock options (in shares)		682,167
Common stock Issued for credit facility	1,700,000	$ 1,712	1,698,288	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
Common stock Issued for asset acquisition (in shares)		1,333,560
Common stock Issued for settlement of current liabilities	453,444	$ 487	452,957	0	0
Common stock Issued for settlement of current liabilities (in shares)		487,574
Stock-based compensation Common stock issued for consulting services	1,338,091	$ 1,370	1,336,721	0	0
Stock-based compensation Common stock issued for consulting services (in shares)		1,370,843
Stock-based compensation Common stock issued for compensation	279,330	$ 302	279,028	0	0
Stock-based compensation Common stock issued for compensation (in shares)		307,787
Stock-based compensation Stock options issued to consultants	66,317	$ 0	66,317	0	0
Stock-based compensation Stock options issued to management	640,789	0	640,789	0	0
Stock-based compensation Stock options issued to employees	163,124	0	163,124	0	0
Stock-based compensation Warrants extension for mineral property	14,155	0	14,155	0	0
Warrants extension for credit facility	104,915	0	104,915	0	0
Net loss for the period	(13,552,594)	0	0	(13,552,594)	0
Other comprehensive loss	(282)	0	0	0	(282)
Balance at Apr. 30, 2016	$ 33,630,461	$ 116,093	$ 239,105,949	$ (205,576,668)	$ (14,913)
Balance (in shares) at Apr. 30, 2016		116,092,655