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Plant And Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Net	$ 2,842us-gaap_PropertyPlantAndEquipmentNet	$ 3,698us-gaap_PropertyPlantAndEquipmentNet
Commissions And Other Costs To Sell Mill Equipment	800vgz_CommissionsAndOtherCostsToSellMillEquipment
Property, Plant, and Equipment, Salvage Value	7,300us-gaap_PropertyPlantAndEquipmentSalvageValue
Los Cardones, Mexico [Member]
Property, Plant and Equipment [Line Items]
Cost	17us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember	17us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember
Accumulated depreciation and write downs	8us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember	5us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember
Net	9us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember	12us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_ConcordiaMexicoMember
Mt. Todd, Australia [Member]
Property, Plant and Equipment [Line Items]
Cost	5,483us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember	5,476us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember
Accumulated depreciation and write downs	2,756us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember	1,993us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember
Net	2,727us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember	3,483us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_MtToddAustraliaMember
Guadalupe de los Reyes, Mexico [Member]
Property, Plant and Equipment [Line Items]
Cost	403us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember	780us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember
Accumulated depreciation and write downs	297us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember	577us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember
Net	106us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember	203us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_GuadalupeDeLosReyesMexicoMember
Corporate, United States [Member]
Property, Plant and Equipment [Line Items]
Cost	5,903us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember	6,273us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember
Accumulated depreciation and write downs	3,061us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember	2,575us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember
Net	$ 2,842us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember	$ 3,698us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = vgz_CorporateUnitedStatesMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ 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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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- Definition

The estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose).

+ References

No definition available.

+ Details

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- Definition

Commissions And Other Costs To Sell Mill Equipment

+ References

No definition available.

+ Details

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