ASSET RETIREMENT OBLIGATIONS (Details 2)	6 Months Ended
	Jan. 31, 2018 USD ($)
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 7,275,504
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	0
Fiscal 2020 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Fiscal 2021 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	0
Fiscal 2022 [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	148,391
Remaining balance [Member]
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 7,127,113