CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock [Member]	Additional Paid-In Capital [Member]	Share Subscription Obligation [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning Balance at Jul. 31, 2011	$ 73,487	$ 154,564,206	$ 194,700	$ (95,740,228)	$ 30,626	$ 59,122,791
Beginning Balance (Shares) at Jul. 31, 2011	73,487,337
Common stock issued pursuant to equity financing	6,285	20,975,263				20,981,548
Common stock issued pursuant to equity financing (Shares)	6,284,770
Common stock issued on the exercise of options and warrants	225	517,895				518,120
Common stock issued on the exercise of options and warrants (Shares)	224,323
Common stock issued pursuant to consulting service agreements	50	167,324				167,374
Common stock issued pursuant to consulting service agreements (Shares)	50,000
Common stock issued pursuant on settlement of convertible debt	128	699,212				699,340
Common stock issued pursuant on settlement of convertible debt (Shares)	128,508
Common stock issued pursuant to acquisition of mineral properties	4,421	15,724,411				15,728,832
Common stock issued pursuant to acquisition of mineral properties (Shares)	4,420,669
Common stock issued pursuant to database acquisition	159	510,989				511,148
Common stock issued pursuant to database acquisition (Shares)	159,236
Common stock issued pursuant to settlement of current liablilites	40	158,386				158,426
Common stock issued pursuant to settlement of current liablilites (Shares)	40,312
Options issued for consulting services		711,249				711,249
Options issued for managment fees		834,219				834,219
Options issued for wages and benefits		1,021,833				1,021,833
Options issued on acquisition of mineral properties		76,442				76,442
Broker options issued on acquisition of mineral properties		28,149				28,149
Net loss for the period				(20,329,907)		(20,329,907)
Unrealized gain on available-for-sale securities					(15,167)	(15,167)
Warrants issued on acquisition of mineral properties		70,460				70,460
Ending Balance at Apr. 30, 2012	$ 84,795	$ 196,060,038	$ 194,700	$ (116,070,135)	$ 15,459	$ 80,284,857
Ending Balance (Shares) at Apr. 30, 2012	84,795,155