CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)	3 Months Ended	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
SALES	$ 0us-gaap_SalesRevenueNet	$ 0us-gaap_SalesRevenueNet	$ 0us-gaap_SalesRevenueNet	$ 0us-gaap_SalesRevenueNet
COSTS AND EXPENSES
Cost of sales	0us-gaap_CostOfRevenue	0us-gaap_CostOfRevenue	0us-gaap_CostOfRevenue	0us-gaap_CostOfRevenue
Inventory write-down	0us-gaap_InventoryWriteDown	338,101us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown	730,250us-gaap_InventoryWriteDown
Mineral property expenditures	1,045,842us-gaap_ExplorationExpenseMining	2,739,349us-gaap_ExplorationExpenseMining	4,560,241us-gaap_ExplorationExpenseMining	6,911,512us-gaap_ExplorationExpenseMining
General and administrative	3,167,896us-gaap_GeneralAndAdministrativeExpense	1,808,395us-gaap_GeneralAndAdministrativeExpense	9,711,933us-gaap_GeneralAndAdministrativeExpense	7,196,664us-gaap_GeneralAndAdministrativeExpense
Depreciation, amortization and accretion	374,082	577,045	1,440,808	1,766,005
Impairment loss on mineral property	0	428,164	0	457,055
Total Operating Expenses	4,587,820us-gaap_OperatingExpenses	5,891,054us-gaap_OperatingExpenses	15,712,982us-gaap_OperatingExpenses	17,061,486us-gaap_OperatingExpenses
LOSS FROM OPERATIONS	(4,587,820)us-gaap_OperatingIncomeLoss	(5,891,054)us-gaap_OperatingIncomeLoss	(15,712,982)us-gaap_OperatingIncomeLoss	(17,061,486)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSES)
Interest income	1,640us-gaap_InvestmentIncomeInterest	7,317us-gaap_InvestmentIncomeInterest	9,646us-gaap_InvestmentIncomeInterest	20,647us-gaap_InvestmentIncomeInterest
Interest and finance costs	(764,761)us-gaap_InterestExpense	(535,802)us-gaap_InterestExpense	(2,270,104)us-gaap_InterestExpense	(2,165,337)us-gaap_InterestExpense
Gain (loss) on disposition of assets	2,400us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets	(498)us-gaap_GainLossOnDispositionOfAssets	(2,553)us-gaap_GainLossOnDispositionOfAssets
Realized loss on available-for-sale securities	(3,023)	0	(3,023)	0
Loss on fair value of variable share forward contract	0	(288,436)	0	(557,037)
Gain on settlement of asset retirement obligations	0	10,868	0	9,831
Total Non-Operating Income Expenses	(763,744)us-gaap_NonoperatingIncomeExpense	(806,053)us-gaap_NonoperatingIncomeExpense	(2,263,979)us-gaap_NonoperatingIncomeExpense	(2,694,449)us-gaap_NonoperatingIncomeExpense
LOSS BEFORE INCOME TAXES	(5,351,564)	(6,697,107)	(17,976,961)	(19,755,935)
DEFERRED INCOME TAX BENEFIT	3,835us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit	27,465us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
NET LOSS FOR THE PERIOD	(5,347,729)us-gaap_NetIncomeLoss	(6,697,107)us-gaap_NetIncomeLoss	(17,949,496)us-gaap_NetIncomeLoss	(19,755,935)us-gaap_NetIncomeLoss
OTHER COMPREHENSIVE INCOME (LOSS), NET OF INCOME TAXES	207	(7,228)	(1,465)	(13,555)
TOTAL COMPREHENSIVE LOSS FOR THE PERIOD	$ (5,347,522)us-gaap_ComprehensiveIncomeNetOfTax	$ (6,704,335)us-gaap_ComprehensiveIncomeNetOfTax	$ (17,950,961)us-gaap_ComprehensiveIncomeNetOfTax	$ (19,769,490)us-gaap_ComprehensiveIncomeNetOfTax
NET LOSS PER SHARE, BASIC AND DILUTED	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.20)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.22)us-gaap_EarningsPerShareBasicAndDiluted
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED	92,034,908	89,924,411	91,683,568	88,666,564

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