CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the year	$ (17,329,872)	$ (23,361,928)	$ (25,975,107)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	3,084,163	5,617,748	1,309,450
Depreciation, amortization and accretion	875,724	2,193,160	2,550,012
Amortization of long-term debt discount	1,245,615	1,353,773	1,498,858
Revaluation of asset retirement obligations	(308,398)	0	0
Impairment loss on mineral properties	97,114	349,805	653,224
Loss on disposition of assets	2,186	38	2,553
Realized loss on available-for-sale securities	0	3,023	0
Loss on fair value of variable share forward contract	0	0	331,130
Loss on settlement of current liabilities	46,968	0	20,581
Gain on settlement of asset retirement obligations	0	0	(9,831)
Deferred income tax benefit	(32,239)	(35,413)	(69,709)
Changes in operating assets and liabilities
Inventories	(23,317)	1,316,959	(700,679)
Prepaid expenses and deposits	(85,673)	46,866	426,549
Other current assets	(30,165)	(2,954)	30,523
Accounts payable and accrued liabilities	(622,713)	243,686	(1,322,106)
Settlement of asset retirement obligations	0	0	(13,551)
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(13,080,607)	(12,275,237)	(21,268,103)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	10,209,632	9,650,530	6,342,254
Net proceeds from debt financing	0	0	9,554,467
Due to related parties	(14,660)	3,426	1,663
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	10,194,972	9,653,956	15,898,384
INVESTING ACTIVITIES
Net cash used in asset acquisition	(46,084)	0	0
Investment in mineral rights and properties	0	(78,626)	(161,800)
Purchase of property, plant and equipment	(18,934)	(23,041)	(163,276)
Proceeds from disposition of assets	818	2,860	600
Cash proceeds from the release of reclamation deposits	0	5,663,158	0
Payment of collateral for surety bonds	0	(1,690,208)	0
Decrease in reclamation deposits	(2)	(346)	362,280
NET CASH FLOWS (USED IN) PROVIDED BY INVESTING ACTIVITIES	(64,202)	3,873,797	37,804
NET CASH FLOWS	(2,949,837)	1,252,516	(5,331,915)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	10,092,408	8,839,892	14,171,807
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 7,142,571	$ 10,092,408	$ 8,839,892