Schedule of Undiscounted Amounts of Estimated Cash Flows (Details) (USD $)	12 Months Ended
	Jul. 31, 2014
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 1	$ 6,382,549
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 2	5,975,265
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 3	2.5
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 4	12
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 5	2.5
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 6	$ 12
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 7	1.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 8	2.43%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 9	1.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 10	2.43%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 11	5.00%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 12	10.50%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 13	5.00%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 14	10.50%