CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the period	$ (13,552,594)	$ (17,949,496)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	2,487,651	4,628,544
Depreciation, amortization and accretion	680,573	1,440,808
Amortization of long-term debt discount	960,807	994,668
Re-valuation of asset retirement obligations	(184,381)	0
Impairment loss on mineral properties	86,535	0
Loss on disposition of assets	2,186	498
Realized loss on available-for-sale securities	0	3,023
Loss on settlement of current liabilities	46,968	0
Deferred income tax benefit	(22,910)	(27,465)
Changes in operating assets and liabilities
Inventories	0	(244,045)
Prepaid expenses and deposits	(303,294)	(94,035)
Other current assets	(6,301)	(478)
Accounts payable and accrued liabilities	(460,536)	(513,926)
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(10,265,296)	(11,761,904)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	10,324,264	435,590
Due to related parties	0	19,394
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	10,324,264	454,984
INVESTING ACTIVITIES
Net cash used in asset acquisition	(46,084)	0
Investment in mineral rights and properties	0	(73,624)
Purchase of property, plant and equipment	(19,304)	(10,905)
Proceeds from disposition of assets	818	2,400
Cash proceeds from the release of reclamation deposits	0	5,663,158
Payment of collateral for surety bonds	0	(1,690,208)
Decrease in reclamation deposits	(1)	(346)
NET CASH FLOWS (USED IN) PROVIDED BY INVESTING ACTIVITIES	(64,571)	3,890,475
NET CASH FLOWS	(5,603)	(7,416,445)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	10,092,408	8,839,892
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 10,086,805	$ 1,423,447