CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the period	$ (8,909,653)	$ (8,585,063)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	1,614,774	1,814,301
Depreciation, amortization and accretion	179,772	279,607
Amortization of long-term debt discount	605,831	601,568
Impairment loss on mineral properties	0	297,942
Inventory write-down	0	60,694
Loss on disposition of assets	474	1,055
Deferred tax benefits	(256,285)	(17,376)
Share of gain from equity-accounted investment	(101,233)	0
Reimbursable Expenses for Reno Creek Acquisition	483,829	0
Changes in operating assets and liabilities
Inventories	0	2,960
Prepaid expenses and deposits	(195,020)	(395,109)
Other current assets	(8,307)	17,218
Accounts payable and accrued liabilities	(208,096)	607,826
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(6,793,914)	(5,314,377)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	103,300	25,899,128
Due to a related party	635	11,528
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	103,935	25,910,656
INVESTING ACTIVITIES
Net cash received from asset acquisition	215,065	0
Investment in mineral rights and properties	(70,000)	0
Purchase of property, plant and equipment	(6,338)	(3,439)
Increase in other long-term assets	(201,160)	0
Purchase of short-term investments	(20,285,190)	0
Redemption of short-term investments	18,101,275	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(2,246,348)	(3,439)
NET CASH FLOWS	(8,936,327)	20,592,840
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	12,575,973	7,142,571
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 3,639,646	$ 27,735,411