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Mineral Properties (Schedule Of Business Acquisitions By Acquisition) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Mineral properties net, Beginning balance | $ 7,184 us-gaap_MineralPropertiesNet |  |
Write-down of mineral property | (750)us-gaap_ImpairmentOfOngoingProject | (250)us-gaap_ImpairmentOfOngoingProject |
Mineral properties net, Ending balance | 5,406 us-gaap_MineralPropertiesNet |  |
Long Valley, United States [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Mineral properties net, Beginning balance | 750 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_LongValleyUnitedStatesMember |  |
Write-down of mineral property | 750 us-gaap_ImpairmentOfOngoingProject / us-gaap_BusinessAcquisitionAxis = vgz_LongValleyUnitedStatesMember |  |
Los Cardones, Mexico [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Mineral properties net, Beginning balance |  |  | 1,536 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Mineral properties net, Ending balance | 1,036 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember |  | 1,536 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Guadalupe de los Reyes, Mexico [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Mineral properties net, Beginning balance |  |  | 2,752 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_GuadalupeDeLosReyesMexicoMember
Mineral properties net, Ending balance | 2,224 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_GuadalupeDeLosReyesMexicoMember |  | 2,752 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_GuadalupeDeLosReyesMexicoMember
Mt. Todd, Australia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Mineral properties net, Beginning balance |  |  | 2,146 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_MtToddAustraliaMember
Mineral properties net, Ending balance | $ 2,146 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_MtToddAustraliaMember |  | $ 2,146 us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_MtToddAustraliaMember

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- Definition Amount recognized as an operating expense or loss during the period to reduce the carrying amount of a project that has been impaired but not abandoned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition Mineral properties, net of adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64895-109465 + Details
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