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Amayapampa Interest (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 item
Amayapampa Interest [Abstract] |
Total payment to be received pursuant to disposal agreement | $ 3,000
Number of payments for disposal of subsidiary | 3
Amount of periodic payment for disposal of subsidiary | 1,000
Capped amount of net smelter return royalty (in ounces) | 720,000
Amayapampa interest fair value | $ 4,813

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- Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of periodic payment for the disposal of subsidiary. + References No definition available. + Details
Name: | vgz_AmountOfPeriodicPaymentForDisposalOfSubsidiary
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maximum amount of gold produced, above which no net smelter return royalty payment is required. + References No definition available. + Details
Name: | vgz_CappedAmountOfNetSmelterReturnRoyalty
Namespace Prefix: | vgz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Includes disclosure of Amayapampa interest. + References No definition available. + Details
Name: | vgz_DiscontinuedOperationsAmayapampaInterestFairValueDisclosure
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of payments for disposal of subsidiary under the disposal agreement. + References No definition available. + Details
Name: | vgz_NumberOfPaymentsForDisposalOfSubsidiary
Namespace Prefix: | vgz_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration