INCOME TAXES (Tables)

12 Months Ended

Jul. 31, 2015

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended July 31,
	2015	2014	2013
Federal income tax provision rate	35.00%	35.00%	35.00%
State income tax provision rate, net of federal income tax effect	0.32%	0.22%	0.10%
Total income tax provision rate	35.32%	35.22%	35.10%

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

					Year Ended July 31,
		2015			2014			2013
Loss before income taxes	$	(23,397,341	)	$	(26,044,816	)	$	(21,873,844	)
Corporate tax rate		35.32%			35.22%			35.10%
Expected tax recovery		(8,263,941	)		(9,172,984	)		(7,677,719	)
Increase (decrease) resulting from
Foreign tax rate differences		223,980			286,071			211,744
Permanent differences		1,473,225			585,482			193,821
Prior year true-up		50,025			(79,672	)		(522,982	)
State tax rate true-up		(205,285	)		(199,795	)		58,729
Foreign exchange rate differences		144,242			97,565			(2,808	)
Other		62,398			(10,431	)		52,097
Change in valuation allowance		6,474,775			8,419,286			7,684,149
Tax adjustment from operations		(40,581	)		(74,478	)		(2,969	)
Unrealized loss (gain), other comprehensive income		5,168			4,769			(7,784	)
Deferred income tax benefit	$	(35,413	)	$	(69,709	)	$	(10,753	)

Schedule of Components of Loss (Income) from Continuing Operations [Table Text Block]

		Year Ended July 31,
		2015			2014			2013
United States	$	(22,612,974	)	$	(25,009,106	)	$	(21,105,334	)
Canada		158,616			155,408			125,652
Paraguay		(942,983	)		(1,191,118	)		(894,162	)
	$	(23,397,341	)	$	(26,044,816	)	$	(21,873,844	)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		July 31, 2015			July 31, 2014
Deferred tax assets (liabilities)
Mineral property acquisitions	$	1,867,777		$	1,644,916
Exploration costs		10,931,265			11,424,636
Stock option expense		5,771,387			4,924,354
Depreciable property		78,651			(430,745	)
Inventories		(2,530,383	)		(1,143,744	)
Asset retirement obligations		(316,136	)		(429,710	)
Other		333,026			201,876
Loss carry forward		43,802,183			37,271,811
		59,937,770			53,463,394
Valuation allowance		(59,942,938	)		(53,468,163	)
Deferred tax assets		(5,168	)		(4,769	)
Deferred tax assets, other comprehensive loss		5,168			4,769
Deferred tax liabilities
Mineral property acquisition		(676,064	)		(711,477	)
Net deferred tax liabilities	$	(676,064	)	$	(711,477	)

Summary of Operating Loss Carryforwards [Table Text Block]

July 31, 2023	$	180,892
July 31, 2024		228,757
July 31, 2025		507,833
July 31, 2026		5,895,221
July 31, 2027		3,892,722
July 31, 2028		9,913,533
July 31, 2029		8,469,032
July 31, 2030		7,319,644
July 31, 2031		14,420,187
July 31, 2032		15,014,013
July 31, 2033		16,332,007
July 31, 2034		21,173,540
July 31, 2035		17,144,355
	$	120,491,736

Summary of Operating Loss Carryforwards, Canadian Dollars [Table Text Block]

July 31, 2027	$	183,105
July 31, 2028		629,788
July 31, 2029		769,072
July 31, 2030		1,224,374
July 31, 2031		2,210,551
July 31, 2032		761,843
July 31, 2033		69,854
July 31, 2034		61,769
July 31, 2035		41,359
	$	5,951,715