CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
SALES	$ 0	$ 9,026,325	$ 13,757,400
COSTS AND EXPENSES
Cost of sales	0	8,016,265	8,112,040
Inventory write-down	804,060	425,208	0
Mineral property expenditures	9,160,648	10,010,691	14,938,722
General and administrative	9,825,796	10,832,929	14,036,974
Depreciation, amortization and accretion	2,392,866	1,551,861	1,275,557
Impairment loss on mineral properties	653,224	0	0
TOTAL OPERATING EXPENSES	22,836,594	30,836,954	38,363,293
LOSS FROM OPERATIONS	(22,836,594)	(21,810,629)	(24,605,893)
OTHER INCOME (EXPENSES)
Interest income	30,027	32,524	69,328
Interest and finance costs	(2,893,816)	(32,758)	(30,898)
Gain (loss) on disposition of assets	(2,553)	4,249	6,999
Realized loss on available-for-sale securities	0	(45,750)	0
Loss on fair value of variable share forward contract	(331,130)	0	0
(Loss) gain on settlement of current liabilities	(20,581)	10,909	221,292
Gain (loss) on settlement of asset retirement obligations	9,831	(32,389)	(444,448)
Loss on fair value of convertible debentures	0	0	(49,681)
Loss on settlement of convertible debentures	0	0	(312,207)
TOTAL OTHER INCOME (EXPENSES)	(3,208,222)	(63,215)	(539,615)
LOSS BEFORE INCOME TAXES	(26,044,816)	(21,873,844)	(25,145,508)
DEFERRED INCOME TAX BENEFIT	69,709	10,753	61,788
NET LOSS FOR THE YEAR	(25,975,107)	(21,863,091)	(25,083,720)
OTHER COMPREHENSIVE LOSS, NET OF INCOME TAXES	(13,539)	22,127	(52,753)
TOTAL COMPREHENSIVE LOSS FOR THE YEAR	$ (25,988,646)	$ (21,840,964)	$ (25,136,473)
NET LOSS PER SHARE, BASIC AND DILUTED	$ (0.29)	$ (0.26)	$ (0.32)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED	89,136,505	85,380,412	78,325,648