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Commitments and Contingencies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2014
Commitments And Contingencies [Abstract] |
Percentage of participating interest in gold project by affilitate | 10.00%vgz_PercentageOfParticipatingInterestInGoldProjectByAffilitate
Cash payment to affiliate as percentage of value of annual gold production from current mining leases | 1.00%vgz_CashPaymentToAffiliateAsPercentageOfValueOfAnnualGoldProductionFromCurrentMiningLeases
Percentage of royalty on other metals | 1.00%vgz_PercentageOfRoyaltyOnOtherMetals
Noncontrolling Interest, Ownership Percentage by Parent | 90.00%us-gaap_MinorityInterestOwnershipPercentageByParent

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Cash payment to affiliate as percentage of value of annual gold production from current mining leases. + References No definition available. + Details
Name: | vgz_CashPaymentToAffiliateAsPercentageOfValueOfAnnualGoldProductionFromCurrentMiningLeases
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of participating interest in gold project by affilitate + References No definition available. + Details
Name: | vgz_PercentageOfParticipatingInterestInGoldProjectByAffilitate
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of royalty on other metals. + References No definition available. + Details
Name: | vgz_PercentageOfRoyaltyOnOtherMetals
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration