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Mineral Properties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	1 Months Ended
	Oct. 31, 2013	Mar. 31, 2015	Jan. 31, 2014
Business Acquisition [Line Items]
Percentage of interest sold	100.00%vgz_PercentageOfInterestSold
Gain on disposal of mineral property, net		$ 1,958vgz_GainLossOnDispositionOfMineralPropertyNetOfCosts
Los Cardones, Mexico [Member]
Business Acquisition [Line Items]
Sale price of gold project	13,000vgz_SalePriceOfGoldProject / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Proceeds from sale of gold project	7,000us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	7,000us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Sale price of gold project	13,000vgz_SalePriceOfGoldProject / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember
Proceeds to be received from sale of joint venture interest			$ 6,000vgz_ProceedsToBeReceivedFromSaleOfJointVentureInterest / us-gaap_BusinessAcquisitionAxis = vgz_ConcordiaMexicoMember

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The gains (losses) included in results of operations resulting from the sale or disposal of mineral property, net of transaction costs, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

+ References

No definition available.

+ Details

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- Definition

Percentage of interest sold.

+ References

No definition available.

+ Details

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- Definition

Proceeds to be received from sale of joint venture interest.

+ References

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- Definition

Sale price of gold project.

+ References

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