SEGMENT INFORMATION (Tables)

3 Months Ended

9 Months Ended

12 Months Ended

Apr. 30, 2013

Apr. 30, 2012

Apr. 30, 2013

Apr. 30, 2012

Jul. 31, 2012

Schedule of Long-Term Assets by Geographic Segment [Table Text Block]

		April 30, 2013
		United States						Canada		Paraguay		Total
Balance Sheet Items		Texas		Arizona		Other States
Mineral Rights and Properties	$	17,322,593	$	10,712,052	$	1,081,919	$	-	$	13,080,555	$	42,197,119
Property, Plant and Equipment		8,368,243		6,914		27,143		36,539		36,877		8,475,716
Reclamation Deposits		6,024,345		15,000		814		-		-		6,040,159
Total Long-Term Assets	$	31,715,181	$	10,733,966	$	1,109,876	$	36,539	$	13,117,432	$	56,712,994

		July 31, 2012
		United States						Canada		Paraguay		Total
Balance Sheet Items		Texas		Arizona		Other States
Mineral Rights and Properties	$	17,823,405	$	10,612,052	$	1,078,907	$	-	$	13,080,556	$	42,594,920
Property, Plant and Equipment		8,919,784		7,331		45,987		63,476		44,656		9,081,234
Reclamation Deposits		5,527,227		15,000		813		-		-		5,543,040
Total Long-Term Assets	$	32,270,416	$	10,634,383	$	1,125,707	$	63,476	$	13,125,212	$	57,219,194

Schedule of Operating Results by Geographic Segments [Table Text Block]

		Three months ended April 30, 2013
		United States									Canada			Paraguay			Total
Statement of Operations		Texas			Arizona			Other States
Sales	$	2,789,325		$	-		$	-		$	-		$	-		$	2,789,325
Cost of sales		2,271,267			-			-			-			-			2,271,267
Gross profit		518,058			-			-			-			-			518,058
Mineral property expenditures		1,595,302			505			116,299			-			115,041			1,827,147
General and administrative		1,160,988			31,478			38,742			1,015,870			(2,396	)		2,244,682
Depreciation, amortization and accretion		324,844			758			6,950			9,458			2,970			344,980
Other (income) and expenses		(3,642	)		5,020			-			(80	)		(4	)		1,294
Net loss for the period	$	(2,559,434	)	$	(37,761	)	$	(161,991	)	$	(1,025,248	)	$	(115,611	)	$	(3,900,045	)

		Three months ended April 30, 2012
		United States									Canada			Paraguay			Total
Statement of Operations		Texas			Arizona			Other States
Sales	$	-		$	-		$	-		$	-		$	-		$	-
Cost of sales		-			-			-			-			-			-
Gross profit		-			-			-			-			-			-
Mineral property expenditures		2,191,220			238,586			70,372			-			1,511,811			4,011,989
General and administrative		2,578,447			46,141			54,406			1,073,986			10,988			3,763,968
Depreciation, amortization and accretion		294,078			758			7,252			9,734			2,826			314,648
Other (income) and expenses		(6,369	)		142,152			-			(1,947	)		(90	)		133,746
Net loss for the period	$	(5,057,376	)	$	(427,637	)	$	(132,030	)	$	(1,081,773	)	$	(1,525,535	)	$	(8,224,351	)

		Nine months ended April 30, 2013
		United States									Canada			Paraguay			Total
Statement of Operations		Texas			Arizona			Other States
Sales	$	7,046,325		$	-		$	-		$	-		$	-		$	7,046,325
Cost of sales		6,225,661			-			-			-			-			6,225,661
Gross profit		820,664			-			-			-			-			820,664
Mineral property expenditures		7,049,924			126,655			364,524			-			568,593			8,109,696
General and administrative		4,610,551			106,266			127,265			3,432,314			887			8,277,283
Depreciation, amortization and accretion		1,146,764			2,275			26,819			31,820			8,885			1,216,563
Other (income) and expenses		(2,352	)		16,319			-			(43	)		(10,924	)		3,000
Net loss for the period	$	(11,984,223	)	$	(251,515	)	$	(518,608	)	$	(3,464,091	)	$	(567,441	)	$	(16,785,878	)

		Nine months ended April 30, 2012
		United States									Canada			Paraguay			Total
Statement of Operations		Texas			Arizona			Other States
Sales	$	6,240,000		$	-		$	-		$	-		$	-		$	6,240,000
Cost of sales		3,160,854			-			-			-			-			3,160,854
Gross profit		3,079,146			-			-			-			-			3,079,146
Mineral property expenditures		7,913,401			425,289			150,916			-			2,417,674			10,907,280
General and administrative		7,794,338			246,301			276,475			3,020,492			31,611			11,369,217
Depreciation, amortization and accretion		869,522			1,011			19,551			39,467			5,573			935,124
Other (income) and expenses		(40,844	)		239,781			-			(1,446	)		(59	)		197,432
Net loss for the period	$	(13,457,271	)	$	(912,382	)	$	(446,942	)	$	(3,058,513	)	$	(2,454,799	)	$	(20,329,907	)