CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
SALES	$ 3,080,000	$ 0	$ 9,026,325
COSTS AND EXPENSES
Cost of sales	2,326,674	0	8,016,265
Inventory write-down	0	804,060	425,208
Mineral property expenditures	5,706,080	9,160,648	10,010,691
General and administrative	13,230,840	9,825,796	10,832,929
Depreciation, amortization and accretion	1,802,443	2,392,866	1,551,861
Impairment loss on mineral properties	349,805	653,224	0
TOTAL OPERATING EXPENSES	23,415,842	22,836,594	30,836,954
LOSS FROM OPERATIONS	(20,335,842)	(22,836,594)	(21,810,629)
OTHER INCOME (EXPENSES)
Interest income	12,797	30,027	32,524
Interest and finance costs	(3,071,235)	(2,893,816)	(32,758)
Gain (loss) on disposition of assets	(38)	(2,553)	4,249
Realized loss on available-for-sale securities	(3,023)	0	(45,750)
Loss on fair value of variable share forward contract	0	(331,130)	0
Gain (loss) on settlement of current liabilities	0	(20,581)	10,909
Gain (loss) on settlement of asset retirement obligations	0	9,831	(32,389)
TOTAL OTHER INCOME (EXPENSES)	(3,061,499)	(3,208,222)	(63,215)
LOSS BEFORE INCOME TAXES	(23,397,341)	(26,044,816)	(21,873,844)
DEFERRED INCOME TAX BENEFIT	35,413	69,709	10,753
NET LOSS FOR THE YEAR	(23,361,928)	(25,975,107)	(21,863,091)
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF INCOME TAXES	(1,092)	(13,539)	22,127
TOTAL COMPREHENSIVE LOSS FOR THE YEAR	$ (23,363,020)	$ (25,988,646)	$ (21,840,964)
NET LOSS PER SHARE, BASIC AND DILUTED	$ (0.25)	$ (0.29)	$ (0.26)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED	92,397,547	89,136,505	85,380,412