CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the period	$ (12,383,927)	$ (13,552,594)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	2,482,178	2,487,651
Depreciation, amortization and accretion	397,399	680,573
Amortization of long-term debt discount	869,830	960,807
Inventory write-down	60,694	0
Re-valuation of asset retirement obligations	0	(184,381)
Impairment loss on mineral properties	297,942	86,535
Loss on disposition of assets	1,055	2,186
Deferred income tax benefit	(26,139)	(22,910)
Loss on settlement of current liabilities	0	46,968
Changes in operating assets and liabilities
Inventories	2,960	0
Prepaid expenses and deposits	(625,393)	(303,294)
Other current assets	(37,537)	(6,301)
Accounts payable and accrued liabilities	745,967	(460,536)
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(8,214,971)	(10,265,296)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	26,444,815	10,324,264
Purchase of short-term investments	(16,000,671)	0
Due to related parties	998	0
NET CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES	10,445,142	10,324,264
INVESTING ACTIVITIES
Net cash used in asset acquisition	0	(46,084)
Purchase of property, plant and equipment	(40,250)	(19,304)
Proceeds from disposition of assets	0	818
Decrease in reclamation deposits	0	(1)
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(40,250)	(64,571)
NET CASH FLOWS	2,189,921	(5,603)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	7,142,571	10,092,408
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 9,332,492	$ 10,086,805