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PROPERTY, PLANT AND EQUIPMENT - Mineral Property Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | $ 2,640 | $ 2,736
(Less) Mineral Property expenses attributable to Discontinued Operations | (2,606) | (2,416)
Mineral property expenses for continued operations | 34 | 320
Kingsville Dome Project, Texas |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 907 | 716
Rosita Project, Texas |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 464 | 530
Vasquez Project, Texas |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 600 | 495
Other Projects, Texas |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 20 | (4)
Total Texas Projects |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 1,991 | 1,737
Cebolleta Project, New Mexico |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 390 | 440
Juan Tafoya Project, New Mexico |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 224 | 223
West Largo |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period |  | 13
Total New Mexico Projects |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 614 | 676
Columbus Basin Project, Nevada |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period |  | 126
Total Nevada Projects |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period |  | 126
Sal Rica Project, Utah |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 1 | 111
Total Utah Projects |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 1 | 111
Coosa Project, Alabama |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | 34 | 86
Total Alabama Projects |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral property expenses for the period | $ 34 | $ 86

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- Definition Exploration expenses (including prospecting and discontinued operations) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References No definition available. + Details
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- Definition Amount of exploration expenditure attributable to discontinued operations. + References No definition available. + Details
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