SEGMENTED INFORMATION (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Costs and Expenses:
Mineral property expenditures	$ 980,215	$ 1,067,446	$ 2,656,915	$ 1,957,564
General and administrative	2,864,165	2,241,247	5,119,127	4,523,485
Depreciation, amortization and accretion	89,437	128,255	179,772	279,607
Impairment loss on mineral properties	0	154,774	0	297,942
Inventory write-down	0	0	0	60,694
Total Cost and Expenses	3,933,817	3,591,722	7,955,814	7,119,292
Loss from operations	(3,933,817)	(3,591,722)	(7,955,814)	(7,119,292)
Other income (expenses)	(667,093)	(749,207)	(1,210,124)	(1,483,147)
Loss before income taxes	(4,600,910)	(4,340,929)	(9,165,938)	(8,602,439)
United States Texas [Member]
Costs and Expenses:
Mineral property expenditures	467,284	449,523	1,183,908	948,807
General and administrative	1,706,667	1,607,974	3,160,538	3,265,437
Depreciation, amortization and accretion	81,998	127,022	167,784	275,067
Impairment loss on mineral properties	0	154,774	0	185,942
Inventory write-down			0	60,694
Total Cost and Expenses	2,255,949	2,339,293	4,512,230	4,735,947
Loss from operations	(2,255,949)	(2,339,293)	(4,512,230)	(4,735,947)
Other income (expenses)	(551,416)	(744,042)	(1,211,396)	(1,473,252)
Loss before income taxes	(2,807,365)	(3,083,335)	(5,723,626)	(6,209,199)
United States Arizona [Member]
Costs and Expenses:
Mineral property expenditures	22,822	22,751	46,562	46,512
General and administrative	3,710	5,340	7,099	26,983
Depreciation, amortization and accretion	0	0	0	0
Impairment loss on mineral properties	0	0	0	8,334
Inventory write-down			0	0
Total Cost and Expenses	26,532	28,091	53,661	81,829
Loss from operations	(26,532)	(28,091)	(53,661)	(81,829)
Other income (expenses)	(4,768)	(4,768)	(9,535)	(9,535)
Loss before income taxes	(31,300)	(32,859)	(63,196)	(91,364)
United States Wyoming [Member]
Costs and Expenses:
Mineral property expenditures	245,825	0	969,216	0
General and administrative	491,361	0	523,793	0
Depreciation, amortization and accretion	3,796	0	5,409	0
Impairment loss on mineral properties	0	0	0	0
Inventory write-down			0	0
Total Cost and Expenses	740,982	0	1,498,418	0
Loss from operations	(740,982)	0	(1,498,418)	0
Other income (expenses)	709	0	1,490	0
Loss before income taxes	(740,273)	0	(1,496,928)	0
United States Other States [Member]
Costs and Expenses:
Mineral property expenditures	16,189	14,868	36,359	32,830
General and administrative	1,122	1,068	2,244	2,135
Depreciation, amortization and accretion	249	249	498	498
Impairment loss on mineral properties	0	0	0	103,666
Inventory write-down			0	0
Total Cost and Expenses	17,560	16,185	39,101	139,129
Loss from operations	(17,560)	(16,185)	(39,101)	(139,129)
Other income (expenses)	0	0	0	0
Loss before income taxes	(17,560)	(16,185)	(39,101)	(139,129)
Canada [Member]
Costs and Expenses:
Mineral property expenditures	0	0	0	0
General and administrative	662,442	614,851	1,358,369	1,193,708
Depreciation, amortization and accretion	2,035	1,991	4,117	3,968
Impairment loss on mineral properties	0	0	0	0
Inventory write-down			0	0
Total Cost and Expenses	664,477	616,842	1,362,486	1,197,676
Loss from operations	(664,477)	(616,842)	(1,362,486)	(1,197,676)
Other income (expenses)	(108,789)	(399)	0	(399)
Loss before income taxes	(773,266)	(617,241)	(1,362,486)	(1,198,075)
Paraguay [Member]
Costs and Expenses:
Mineral property expenditures	228,095	580,304	420,870	929,415
General and administrative	(1,137)	12,014	67,084	35,222
Depreciation, amortization and accretion	1,359	(1,007)	1,964	74
Impairment loss on mineral properties	0	0	0	0
Inventory write-down			0	0
Total Cost and Expenses	228,317	591,311	489,918	964,711
Loss from operations	(228,317)	(591,311)	(489,918)	(964,711)
Other income (expenses)	(2,829)	2	9,317	39
Loss before income taxes	$ (231,146)	$ (591,309)	$ (480,601)	$ (964,672)