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Mineral Properties - Mineral Properties Exploration Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Abstract] |  |
Geologic and field expenses | $ 447 | $ 537
Administrative | 252 | 91
Total exploration expense | $ 699 | $ 628

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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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- Definition Amount of general and administrative expense classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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