ASSET RETIREMENT OBLIGATIONS (Details 2)	9 Months Ended
	Apr. 30, 2017 USD ($)
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 6,650,255
Fiscal 2017 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Fiscal 2018 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Fiscal 2019 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	139,052
Fiscal 2020 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	414,058
Fiscal 2021 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	667,984
Remaining balance [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 5,429,161