CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the year	$ (23,361,928)	$ (25,975,107)	$ (21,863,091)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	5,617,748	1,309,450	1,015,787
Depletion, depreciation, amortization and accretion	3,546,933	4,048,870	2,778,624
Impairment loss on mineral property	349,805	653,224	0
Loss (gain) on disposition of assets	38	2,553	(4,249)
Realized loss on available-for-sale securities	3,023	0	45,750
Loss on fair value of variable share forward contract	0	331,130	0
Loss (gain) on settlement of current liabilities	0	20,581	(10,909)
Loss (gain) on settlement of asset retirement obligations	0	(9,831)	32,389
Deferred income tax benefit	(35,413)	(69,709)	(10,753)
Changes in operating assets and liabilities
Inventories	1,316,959	(700,679)	900,381
Prepaid expenses and deposits	46,866	426,549	(380,766)
Other current assets	(2,954)	30,523	228,000
Accounts payable and accrued liabilities	243,686	(1,322,106)	(1,899,859)
Settlement of asset retirement obligations	0	(13,551)	(142,305)
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(12,275,237)	(21,268,103)	(19,311,001)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	9,650,530	6,559,523	46,464
Net proceeds from debt financing	0	9,972,944	9,405,946
Debt and equity financing costs	0	(635,746)	0
Due to related parties	3,426	1,663	(37,872)
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	9,653,956	15,898,384	9,414,538
INVESTING ACTIVITIES
Investment in mineral rights and properties	(78,626)	(161,800)	(275,030)
Purchase of property, plant and equipment	(23,041)	(163,276)	(179,115)
Proceeds from disposition of assets	2,860	600	5,000
Cash proceeds from the release of reclamation deposits	5,663,158	0	0
Payment of collateral for surety bonds	(1,690,208)	0	0
Decrease (increase) in reclamation deposits	(346)	362,280	(497,869)
NET CASH FLOWS PROVIDED BY (USED IN) INVESTING ACTIVITIES	3,873,797	37,804	(947,014)
NET CASH FLOWS	1,252,516	(5,331,915)	(10,843,477)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	8,839,892	14,171,807	25,015,284
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 10,092,408	$ 8,839,892	$ 14,171,807