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Mineral Property Expenditures - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Total expense for the period	$ 1,039	$ 920	$ 2,908	$ 3,021
Temrezli Project Turkey [Member]
Total expense for the period	31		453
Total Turkey Projects [Member]
Total expense for the period	31		453
Kingsville Dome Project Texas [Member]
Total expense for the period	214	200	624	589
Rosita Project Texas [Member]
Total expense for the period	130	306	290	548
Vasquez Project Texas [Member]
Total expense for the period	105	111	365	409
Butler Ranch Project Texas [Member]
Total expense for the period	9	179	19	250
Other Projects Texas [Member]
Total expense for the period	2	55	61	535
Total Texas Projects [Member]
Total expense for the period	460	851	1,359	2,331
Cebolleta Project New Mexico [Member]
Total expense for the period			537	537
Juan Tafoya Project New Mexico [Member]
Total expense for the period	37	37	48	46
Other Projects New Mexico [Member]
Total expense for the period	32	32	32	107
Total New Mexico Projects [Member]
Total expense for the period	69	69	617	690
Columbus Basin Project Nevada [Member]
Total expense for the period	113		113
Other Projects, Nevada [Member]
Total expense for the period	14		14
Total Nevada Projects [Member]
Total expense for the period	127		127
Sal Rica Project, Utah [Member]
Total expense for the period	352		352
Total Utah Projects [Member]
Total expense for the period	$ 352		$ 352