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MINERAL PROPERTY EXPENDITURES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Total expense for the period | $ 634 | $ 782 | $ 3,538 | $ 4,584
Temrezli Project, Turkey [Member] |  |  |  |
Total expense for the period |  | 79 | 117 | 261
Total Turkey Projects [Member] |  |  |  |
Total expense for the period |  | 79 | 117 | 261
Kingsville Dome Project, Texas [Member] |  |  |  |
Total expense for the period | 244 | 251 | 800 | 810
Rosita Project, Texas [Member] |  |  |  |
Total expense for the period | 117 | 197 | 738 | 590
Vasquez Project, Texas [Member] |  |  |  |
Total expense for the period | 186 | 235 | 631 | 572
Other Projects, Texas [Member] |  |  |  |
Total expense for the period |  | 6 | 20 | 71
Total Texas Projects [Member] |  |  |  |
Total expense for the period | 547 | 689 | 2,189 | 2,043
Juan Tafoya Project, New Mexico [Member] |  |  |  |
Total expense for the period | 6 | 6 | 223 | 542
Total New Mexico Projects [Member] |  |  |  |
Total expense for the period | 6 | 6 | 612 | 1,080
Columbus Basin Project, Nevada [Member] |  |  |  |
Total expense for the period |  | 2 | 249 | 866
Railroad Valley Project, Nevada [Member] |  |  |  |
Total expense for the period |  | 4 | 90 | 241
Total Nevada Projects [Member] |  |  |  |
Total expense for the period |  | 6 | 339 | 1,107
Sal Rica Project, Utah [Member] |  |  |  |
Total expense for the period | 1 | 2 | 141 | 93
Total Utah Projects [Member] |  |  |  |
Total expense for the period | 1 | $ 2 | 141 | 93
Coosa Project, Alabama [Member] |  |  |  |
Total expense for the period | 80 |  | 140 |
Total Alabama Projects [Member] |  |  |  |
Total expense for the period | $ 80 |  | $ 140 |

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- Definition Exploration expenses (including prospecting) 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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