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Liquidity - (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2013 Subsequent Event [Member] | Dec. 31, 2014 Subsequent Event [Member] | Jun. 30, 2014 Guadalupe de los Reyes gold/silver project [Member]
Cash Burn Rate Per Quarter |  | $ 2,000 |
Anticipation sale amount to be receive subject to purchase option | $ 6,000 |  | $ 850

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- Definition Anticipation sale amount to be receive subject to purchase option + References No definition available. + Details
Name: | vgz_AnticipationSaleAmountToBeReceiveSubjectToPurchaseOption
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash Burn Rate Per Quarter + References No definition available. + Details
Name: | vgz_CashBurnRatePerQuarter
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration