CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
SALES	$ 0	$ 3,080,000	$ 0
COSTS AND EXPENSES
Cost of sales	0	2,326,674	0
Inventory write-down	0	0	804,060
Mineral property expenditures	4,061,159	5,706,080	9,160,648
General and administrative	9,297,746	13,230,840	9,825,796
Depreciation, amortization and accretion	875,724	1,802,443	2,392,866
Impairment loss on mineral properties	97,114	349,805	653,224
Total Operating Expenses	14,331,743	23,415,842	22,836,594
LOSS FROM OPERATIONS	(14,331,743)	(20,335,842)	(22,836,594)
OTHER INCOME (EXPENSES)
Interest income	24,177	12,797	30,027
Interest expenses and finance costs	(3,005,391)	(3,071,235)	(2,893,816)
Loss on disposition of assets	(2,186)	(38)	(2,553)
Realized loss on available-for-sale securities	0	(3,023)	0
Loss on fair value of variable share forward contract	0	0	(331,130)
Loss on settlement of current liabilities	(46,968)	0	(20,581)
Gain on settlement of asset retirement obligations	0	0	9,831
Total Non-Operating Income Expense	(3,030,368)	(3,061,499)	(3,208,222)
LOSS BEFORE INCOME TAXES	(17,362,111)	(23,397,341)	(26,044,816)
DEFERRED INCOME TAX BENEFIT	32,239	35,413	69,709
NET LOSS FOR THE YEAR	(17,329,872)	(23,361,928)	(25,975,107)
OTHER COMPREHENSIVE LOSS, NET OF INCOME TAXES	(99)	(1,092)	(13,539)
TOTAL COMPREHENSIVE LOSS FOR THE YEAR	$ (17,329,971)	$ (23,363,020)	$ (25,988,646)
NET LOSS PER SHARE, BASIC AND DILUTED	$ (0.16)	$ (0.25)	$ (0.29)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED	106,086,782	92,397,547	89,136,505