Mineral Property Expenditures - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Total expense for the period	$ 1,138	$ 1,292	$ 1,869	$ 2,101
Temrezli Project Turkey [Member]
Total expense for the period	180		421
Total Turkey Projects [Member]
Total expense for the period	180		421
Kingsville Dome Project Texas [Member]
Total expense for the period	176	152	410	389
Rosita Project Texas [Member]
Total expense for the period	92	134	160	243
Vasquez Project Texas [Member]
Total expense for the period	102	131	260	297
Butler Ranch Project Texas [Member]
Total expense for the period	4	13	9	71
Other Projects Texas [Member]
Total expense for the period	44	322	61	480
Total Texas Projects [Member]
Total expense for the period	418	752	900	1,480
Cebolleta Project New Mexico [Member]
Total expense for the period	537	537	537	537
Juan Tafoya Project New Mexico [Member]
Total expense for the period	3	3	11	9
Other Projects New Mexico [Member]
Total expense for the period				75
Total New Mexico Projects [Member]
Total expense for the period	$ 540	$ 540	$ 548	$ 621