SEGMENTED INFORMATION (Details 1) - USD ($)	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Sales	$ 0	$ 0	$ 3,080,000
Costs and Expenses:
Cost of sales	0	0	2,326,674
Inventory write-down	60,694	0	0
Mineral property expenditures	4,120,388	4,061,159	5,706,080
General and administrative	10,241,681	9,297,746	13,230,840
Depreciation, amortization and accretion	497,728	875,724	1,802,443
Impairment loss on mineral property	297,942	97,114	349,805
Total Cost and Expenses	15,218,433	14,331,743	23,415,842
Loss from operations	(15,218,433)	(14,331,743)	(20,335,842)
Other income (expenses)	(2,786,978)	(3,030,368)	(3,061,499)
Loss before income taxes	(18,005,411)	(17,362,111)	(23,397,341)
United States Texas [Member]
Sales	0	0	3,080,000
Costs and Expenses:
Cost of sales	0	0	2,326,674
Inventory write-down	60,694	0	0
Mineral property expenditures	2,450,834	2,733,007	4,227,720
General and administrative	7,053,270	6,447,801	9,702,423
Depreciation, amortization and accretion	487,288	857,966	1,776,845
Impairment loss on mineral property	185,942	0	349,805
Total Cost and Expenses	10,238,028	10,038,774	18,383,467
Loss from operations	(10,238,028)	(10,038,774)	(15,303,467)
Other income (expenses)	(2,772,617)	(3,012,281)	(3,042,084)
Loss before income taxes	(13,010,645)	(13,051,055)	(18,345,551)
United States Arizona [Member]
Sales	0	0	0
Costs and Expenses:
Cost of sales	0	0	0
Inventory write-down	0	0	0
Mineral property expenditures	101,628	236,717	289,676
General and administrative	33,761	205,591	194,910
Depreciation, amortization and accretion	0	0	0
Impairment loss on mineral property	8,334	0	0
Total Cost and Expenses	143,723	442,308	484,586
Loss from operations	(143,723)	(442,308)	(484,586)
Other income (expenses)	(18,914)	(18,965)	(19,785)
Loss before income taxes	(162,637)	(461,273)	(504,371)
United States Other States [Member]
Sales	0	0	0
Costs and Expenses:
Cost of sales	0	0	0
Inventory write-down	0	0	0
Mineral property expenditures	70,588	133,518	231,305
General and administrative	3,933	2,724	19,317
Depreciation, amortization and accretion	996	2,821	2,635
Impairment loss on mineral property	103,666	97,114	0
Total Cost and Expenses	179,183	236,177	253,257
Loss from operations	(179,183)	(236,177)	(253,257)
Other income (expenses)	0	0	0
Loss before income taxes	(179,183)	(236,177)	(253,257)
Canada [Member]
Sales	0	0	0
Costs and Expenses:
Cost of sales	0	0	0
Inventory write-down	0	0	0
Mineral property expenditures	0	0	0
General and administrative	3,063,839	2,636,514	3,284,772
Depreciation, amortization and accretion	8,088	8,142	12,026
Impairment loss on mineral property	0	0	0
Total Cost and Expenses	3,071,927	2,644,656	3,296,798
Loss from operations	(3,071,927)	(2,644,656)	(3,296,798)
Other income (expenses)	636	850	(120)
Loss before income taxes	(3,071,291)	(2,643,806)	(3,296,918)
Paraguay [Member]
Sales	0	0	0
Costs and Expenses:
Cost of sales	0	0	0
Inventory write-down	0	0	0
Mineral property expenditures	1,497,338	957,917	957,379
General and administrative	86,878	5,116	29,418
Depreciation, amortization and accretion	1,356	6,795	10,937
Impairment loss on mineral property	0	0	0
Total Cost and Expenses	1,585,572	969,828	997,734
Loss from operations	(1,585,572)	(969,828)	(997,734)
Other income (expenses)	3,917	28	490
Loss before income taxes	$ (1,581,655)	$ (969,800)	$ (997,244)