ASSET RETIREMENT OBLIGATIONS (Details 1) - USD ($)	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Assumptions Used For ARO Estimates [Line Items]
Undiscounted amount of estimated cash flows	$ 7,098,581	$ 6,650,255
Minimum [Member]
Assumptions Used For ARO Estimates [Line Items]
Payable in years	5 years	4 years 1 month 6 days
Inflation rate	1.37%	1.15%
Discount rate	5.48%	5.02%
Maximum [Member]
Assumptions Used For ARO Estimates [Line Items]
Payable in years	17 years	15 years
Inflation rate	2.14%	2.25%
Discount rate	6.40%	8.00%