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Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Total expense for the period	$ 4,584	$ 3,248
Temrezli Project, Turkey [Member]
Total expense for the period	261	498
Total Turkey Projects [Member]
Total expense for the period	261	498
Kingsville Dome Project, Texas [Member]
Total expense for the period	810	779
Rosita Project, Texas [Member]
Total expense for the period	590	402
Vasquez Project, Texas [Member]
Total expense for the period	572	461
Butler Ranch Project, Texas [Member]
Total expense for the period	21	12
Other Projects, Texas [Member]
Total expense for the period	50	94
Total Texas Projects [Member]
Total expense for the period	2,043	1,748
Crownpoint Project, New Mexico [Member]
Total expense for the period		5
Churchrock Project, New Mexico [Member]
Total expense for the period		20
Cebolleta Project, New Mexico [Member]
Total expense for the period	538	138
Juan Tafoya Project, New Mexico [Member]
Total expense for the period	528	47
Other Projects New Mexico [Member]
Total expense for the period	14	5
Total New Mexico Projects [Member]
Total expense for the period	1,080	215
Columbus Basin Project, Nevada [Member]
Total expense for the period	866	232
Railroad Valley, Neveda[Member]
Total expense for the period	238
Other Projects, Nevada [Member]
Total expense for the period	3	31
Total Nevada Projects [Member]
Total expense for the period	1,107	263
Sal Rica Project, Utah [Member]
Total expense for the period	93	524
Total Utah Projects [Member]
Total expense for the period	$ 93	$ 524

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- Definition

Exploration expenses (including prospecting) related to the mining industry would be included in operating expenses. Exploration costs include costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of mineral reserves.

+ References

No definition available.

+ Details

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