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Commitments and Contingencies (Narrative) (Details)	12 Months Ended
	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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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Cash payment to affiliate as percentage of value of annual gold production from current mining leases.

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Percentage of participating interest in gold project by affilitate

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Percentage of royalty on other metals.

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