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

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Mineral properties, net of adjustments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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