Note 4 - Mineral Rights and Properties - Mineral Rights and Property Acquisition Costs (Details) - USD ($)	Jan. 31, 2019	Jul. 31, 2018
Mineral Rights and Properties
Mineral Properties	$ 67,659,501	$ 74,997,692
Accumulated Depletion	(3,929,884)	(3,929,884)
	63,729,617	71,067,808
	63,763,109	71,122,576
Palangana Mine [Member]
Mineral Rights and Properties
Mineral Properties	6,285,898	6,285,898
Goliad Project [Member]
Mineral Rights and Properties
Mineral Properties	8,689,127	8,689,127
Burke Hollow Project [Member]
Mineral Rights and Properties
Mineral Properties	1,495,750	1,495,750
Longhorn Project [Member]
Mineral Rights and Properties
Mineral Properties	116,870	116,870
Salvo Project [Member]
Mineral Rights and Properties
Mineral Properties	14,905	14,905
Anderson Project [Member]
Mineral Rights and Properties
Mineral Properties	3,470,373	9,154,268
Workman Creek Project [Member]
Mineral Rights and Properties
Mineral Properties	649,854	1,657,500
Los Cuatros Project [Member]
Mineral Rights and Properties
Mineral Properties	257,250	257,250
Slick Rock Project [Member]
Mineral Rights and Properties
Mineral Properties		646,650
Reno Creek Project [Member]
Mineral Rights and Properties
Mineral Properties	31,527,870	31,527,870
Diabase Project [Member]
Mineral Rights and Properties
Mineral Properties	546,938	546,938
Yuty Project [Member]
Mineral Rights and Properties
Mineral Properties	11,947,144	11,947,144
Oviedo Project [Member]
Mineral Rights and Properties
Mineral Properties	1,133,412	1,133,412
Alto Parana Titanium Project [Member]
Mineral Rights and Properties
Mineral Properties	1,433,030	1,433,030
Other Property Acquisitions [Member]
Mineral Rights and Properties
Mineral Properties	91,080	91,080
Mineral Rights, Databases [Member]
Mineral Rights and Properties
Mineral rights, gross	2,410,038	2,410,038
Accumulated Amortization	(2,408,690)	(2,405,192)
	1,348	4,846
Land Use Agreements [Member]
Mineral Rights and Properties
Mineral rights, gross	404,310	404,310
Accumulated Amortization	(372,166)	(354,388)
	$ 32,144	$ 49,922