Schedule of Asset Retirement Obligation (Details) (USD $)	3 Months Ended
	Oct. 31, 2012
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 1	$ 3,112,374
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 2	3,027,803
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 3	0
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 4	567,069
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 5	(36,141)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 6	(619,772)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 7	45,502
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 8	137,274
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 9	3,121,735
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 10	3,112,374
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 11	(97,157)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 12	(133,298)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 13	3,024,578
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 14	$ 2,979,076