ASSET RETIREMENT OBLIGATIONS (Details 1) - USD ($)	9 Months Ended	12 Months Ended
	Apr. 30, 2017	Jul. 31, 2016
Undiscounted Estimated Cash Flows and Assumptions Used For ARO Estimates [Line Items]
Undiscounted amount of estimated cash flows	$ 6,650,255	$ 6,650,255
Minimum [Member]
Undiscounted Estimated Cash Flows and Assumptions Used For ARO Estimates [Line Items]
Payable in years	4 years 1 month 6 days	4 years 1 month 6 days
Inflation rate	1.15%	1.15%
Discount rate	5.02%	5.02%
Maximum [Member]
Undiscounted Estimated Cash Flows and Assumptions Used For ARO Estimates [Line Items]
Payable in years	15 years	15 years
Inflation rate	2.25%	2.25%
Discount rate	8.00%	8.00%