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Property, Plant and Equipment (Details Narrative) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) a $ / shares | Dec. 31, 2016 USD ($) | Jun. 20, 2017 a
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a |  |  | 9,270
Average long term price of asset | $ / shares | $ 41.34 |  |
Asset impairment charges | $ 11,436 | $ 1,673 |
Drop of Acreage [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net area on mineral leases | a | 1,542 |  |
General Directorate [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalty, ranging | 1.00% |  |
Railroad Valley Project [Member] | June [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a | 9,270 |  |
Columbus Basin Project [Member] | July and September 2016 [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a | 14,200 |  |
Sal Rica Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a | 9,900 |  |
Area of unpatented mining claims | a | 3,360 |  |
Percentage of NSR royalty | 2.00% |  |
Temrezli Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Granted licenses cover area | a | 13,490 |  |
Temrezli Project [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalty, ranging | 2.00% |  |
Temrezli Project [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalty, ranging | 16.00% |  |
Kingsville Dome Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross area on mineral leases | a | 2,434 |  |
Net area on mineral leases | a | 2,227 |  |
Asset impairment charges | $ 100 | 200 |
Kingsville Dome Project [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 6.25% |  |
Annual per acre royalty payable | $ / shares | $ 10 |  |
Kingsville Dome Project [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 9.375% |  |
Annual per acre royalty payable | $ / shares | $ 30 |  |
Rosita Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross area on mineral leases | a | 2,759 |  |
Net area on mineral leases | a | 2,759 |  |
Rosita South Property [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross area on mineral leases | a | 1,795 |  |
Net area on mineral leases | a | 1,479 |  |
Rosita [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 6.25% |  |
Annual per acre royalty payable | $ / shares | $ 10 |  |
Rosita [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 18.25% |  |
Annual per acre royalty payable | $ / shares | $ 30 |  |
Mineral sales price per pound | $ / shares | $ 80.00 |  |
Vasquez Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gross area on mineral leases | a | 872 |  |
Net area on mineral leases | a | 872 |  |
Vasquez Project [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 6.25% |  |
Mineral sales price per pound | $ / shares | $ 25.00 |  |
Vasquez Project [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 10.25% |  |
Mineral sales price per pound | $ / shares | $ 40.00 |  |
Butler Ranch Exploration Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net area on mineral leases | a | 990 |  |
Butler Ranch Exploration Project [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual per acre royalty payable | $ / shares | $ 10 |  |
Lease term | 8 years |  |
Butler Ranch Exploration Project [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 10.00% |  |
Annual per acre royalty payable | $ / shares | $ 25 |  |
Lease term | 10 years |  |
Cebolleta Property [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a | 6,717 |  |
Lease term | 10 years |  |
Initial payments per lease agreement | $ 5,000 |  |
Amount used in the calculation of recoverable reserve payment per unit | 1.00 |  |
Royalty payable | $ 1,500 |  |
Annual advance royalties previously paid | 500 |  |
Reduction in advanced royalty payment | 350 |  |
Payment on commencement of production | $ 4,000 |  |
Fixed royalty percentage | 5.75% |  |
Cebolleta Property [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 4.50% |  |
Cebolleta Property [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 8.00% |  |
Feasibility study term | 6 years |  |
Annual advance royalties previously paid | $ 5,000 |  |
Amount of deduction to recoverable reserve payment | $ 6,500 |  |
Juan Tafoya Property [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Area of land | a | 115 |  |
Lease term | 10 years |  |
Initial payments per lease agreement | $ 250 |  |
Reduction in advanced royalty payment | $ 174 |  |
Fixed royalty percentage | 4.00% |  |
Area of land in mineral fee interest acquired | a | 4,097 |  |
Annual base rent per acre | $ / shares | $ 75 |  |
Reduction of market value per pound | $ / shares | $ 25 |  |
Juan Tafoya Property [Member] | First Five Year [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual rental payments | $ 225 |  |
Juan Tafoya Property [Member] | Second Five Year [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Annual rental payments | $ 337 |  |
Juan Tafoya Property [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 4.65% |  |
Juan Tafoya Property [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Percentage of royalties on lease of sales | 6.50% |  |
Cebolleta/Juan Tafoya Property [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges | $ 11,296 |  |
Carrying value impairment | 7,800 |  |
Butler Ranch Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  | 579 |
Sejita Dome Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  | 534 |
Nell Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  | 209 |
Jack Pump Project [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment charges |  | 191 |
Mineral Property [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Mineral property expenses | $ 4,600 | $ 3,200 |

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