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Mineral Properties (Schedule Of Business Acquisitions By Acquisition) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Mineral Properties, Net	$ 3,870us-gaap_MineralPropertiesNet	$ 5,406us-gaap_MineralPropertiesNet
Mt. Todd, Australia [Member]
Business Acquisition [Line Items]
Mineral Properties, Net	2,146us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_MtToddAustraliaMember	2,146us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_MtToddAustraliaMember
Guadalupe de los Reyes, Mexico [Member]
Business Acquisition [Line Items]
Mineral Properties, Net	1,724us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_GuadalupeDeLosReyesMexicoMember	2,224us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_GuadalupeDeLosReyesMexicoMember
Los Cardones, Mexico [Member]
Business Acquisition [Line Items]
Mineral Properties, Net		1,036us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Long Valley, United States [Member]
Business Acquisition [Line Items]
Mineral Properties, Net	$ 3,870us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_LongValleyUnitedStatesMember	$ 5,406us-gaap_MineralPropertiesNet / us-gaap_BusinessAcquisitionAxis = vgz_LongValleyUnitedStatesMember

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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

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