CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
CASH (USED IN) PROVIDED BY: OPERATING ACTIVITIES
Net loss for the year	$ (25,083,720)	$ (27,358,095)	$ (14,478,669)
Adjustments to reconcile net loss to net cash from operating activities
Stock-based compensation	2,909,503	6,342,739	7,029,390
Depreciation, amortization, depletion and accretion	2,219,924	1,155,959	794,504
Impairment loss on mineral properties	0	143,396	43,600
(Gain) loss on disposition of assets	(6,999)	9,234	3,677
Gain on sale of investments	0	(508,682)	0
Loss on fair value of convertible debentures	49,681	0	0
Loss on settlement of convertible debentures	312,207	0	0
Gain on settlement of accounts payable	(221,292)	0	0
Loss on settlement of asset retirement obligations	444,448	0	0
Gain on sale of discontinued operations, net of income taxes	0	0	(8,534,081)
Deferred income tax benefit	(61,788)	0	0
Non-cash financing charges	0	0	517,273
Other non-cash adjustment	0	0	(4,413)
Changes in operating assets and liabilities
Accounts and interest receivable	(166,626)	(44,457)	(19,555)
Inventories	899,847	(2,063,630)	0
Prepaid expenses and deposits	(433,293)	(96,985)	(30,659)
Accounts payable and accrued liabilities	993,865	(42,485)	2,475,429
Settlement of asset retirement obligations	(1,064,220)	(1,212,942)	(1,368,685)
NET CASH FLOWS USED IN OPERATING ACTIVITIES	(19,208,463)	(23,675,948)	(13,572,189)
FINANCING ACTIVITIES
Issuance of shares for cash, net of issuance costs	21,522,863	37,106,294	1,144,760
Settlement of convertible debentures	(1,370,486)	0	0
Due to related parties	39,156	8,287	37,360
NET CASH FLOWS PROVIDED BY FINANCING ACTIVITIES	20,191,533	37,114,581	1,182,120
INVESTING ACTIVITIES
Investment in mineral rights and properties	(4,184,269)	(1,453,767)	(1,421,900)
Purchase of property, plant and equipment	(1,321,678)	(719,171)	(166,648)
Settlement of loan assumed from acquisition of subsidiaries	(260,650)	(300,000)	0
Proceeds from disposition of assets	7,500	530,650	11,003,723
Proceeds from sale of investments	0	29,035	0
Reclamation deposits	(932,740)	(1,868,991)	(223,087)
NET CASH FLOWS (USED IN) PROVIDED BY INVESTING ACTIVITIES	(6,691,837)	(3,782,244)	9,192,088
NET CASH FLOWS	(5,708,767)	9,656,389	(3,197,981)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	30,724,051	21,067,662	24,265,643
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 25,015,284	$ 30,724,051	$ 21,067,662