Schedule of Asset Retirement Obligation (Details) (USD $)	6 Months Ended
	Jan. 31, 2013
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	435,004
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 4	567,069
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 5	(53,424)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 6	(619,772)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 7	94,327
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 8	137,274
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 9	3,588,281
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 10	3,112,374
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 11	(79,874)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 12	(133,298)
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 13	3,508,407
Asset Retirement Obligations Schedule Of Asset Retirement Obligation 14	$ 2,979,076