ASSET RETIREMENT OBLIGATIONS (Details 2)	3 Months Ended
	Oct. 31, 2016 USD ($)
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 6,650,255
Asset Retirement Obligation Next Twelve Months [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Asset Retirement Obligation Year Two [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Asset Retirement Obligation Year Three [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	139,052
Asset Retirement Obligation Year Four [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	414,058
Asset Retirement Obligation Year Five [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	667,984
Asset Retirement Obligation Remainder Of Fiscal Year [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 5,429,161