ASSET RETIREMENT OBLIGATIONS (Details 2)	12 Months Ended
	Jul. 31, 2017 USD ($)
Undiscounted Amount Of Estimated Cash Flow
Undiscounted Amount of Estimated Cash Flows	$ 7,098,581
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	$ 6,950,190