MINERAL PROPERTY EXPENDITURES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Mineral property expenses	$ 576	$ 808	$ 1,178	$ 1,426
Kingsville Dome Project, Texas
Mineral property expenses	179	145	444	389
Rosita Project, Texas
Mineral property expenses	122	100	213	217
Vasquez Project, Texas
Mineral property expenses	121	126	362	312
Other Projects, Texas
Exploration and evaluation costs (reversals)		(8)		(8)
Mineral property expenses	3		3
Total Texas Projects
Mineral property expenses	425	363	1,022	910
Cebolleta Project, New Mexico
Mineral property expenses	141	440	141	440
Juan Tafoya Project, New Mexico
Mineral property expenses	3	3	9	9
Total New Mexico Projects
Mineral property expenses	144	443	150	449
Columbus Basin Project, Nevada
Exploration and evaluation costs (reversals)			(1)
Mineral property expenses	1	1		1
Total Nevada Projects
Exploration and evaluation costs (reversals)			(1)
Mineral property expenses	1	1		1
Sal Rica Project, Utah
Mineral property expenses		1	1	1
Total Utah Projects
Mineral property expenses		$ 1	1	1
Coosa Project, Alabama
Mineral property expenses	6		6	65
Total Alabama Projects
Mineral property expenses	$ 6		$ 6	$ 65