CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
CASH PROVIDED BY (USED IN): OPERATING ACTIVITIES
Net loss for the period	$ (4,555,840)	$ (4,252,694)
Adjustments to reconcile net loss to cash flows in operating activities
Stock-based compensation	640,679	985,261
Depreciation, amortization and accretion	90,335	151,352
Amortization of long-term debt discount	297,422	295,329
Impairment loss on mineral properties	0	143,168
Inventory write-down	0	60,694
Deferred income tax benefit	(9,188)	(8,816)
Share of gain from equity-accounted investment	(108,789)	0
Reimbursable Expenses for Reno Creek Acquisition	483,829	0
Changes in operating assets and liabilities
Inventories	0	2,960
Prepaid expenses and deposits	(138,375)	(471,806)
Other current assets	16,085	17,795
Accounts payable and accrued liabilities	(853,734)	225,987
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(4,137,576)	(2,850,770)
FINANCING ACTIVITIES
Shares issuance for cash, net of issuance costs	0	36,000
Due to a related party	2,490	0
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	2,490	36,000
INVESTING ACTIVITIES
Net cash received from asset acquisition	215,065	0
Purchase of property, plant and equipment	(2,311)	0
Increase in other long-term assets	(97,836)	0
Purchase of short-term investments	(8,603,700)	0
Redemption of short-term investments	10,000,000	0
NET CASH FLOWS PROVIDED BY INVESTING ACTIVITIES	1,511,218	0
NET CASH FLOWS	(2,623,868)	(2,814,770)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	12,575,973	7,142,571
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 9,952,105	$ 4,327,801