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Supplemental Cash Flow Information and Material Non-Cash Transactions (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2014
Compensation Options Issued to Underwriters 166,667vgz_CompensationOptionsIssuedToUnderwriters  
Gold Production Volume Second Tier For Royalty Calculation   $ 1,250vgz_GoldProductionVolumeSecondTierForRoyaltyCalculation
Royalty Percentage On Second Tier Volume Production   2.50%vgz_RoyaltyPercentageOnSecondTierVolumeProduction
Gold Production Volume First Tier For Royalty Calculation   $ 1,250vgz_GoldProductionVolumeFirstTierForRoyaltyCalculation
Royalty Percentage On First Tier Volume Production   2.00%vgz_RoyaltyPercentageOnFirstTierVolumeProduction
Percentage Of Ownership Under Purchase Agreement   100.00%vgz_PercentageOfOwnershipUnderPurchaseAgreement
Two Thousand Thirteen Facility [Member]    
Number of shares issued in transaction, (Shares)   612,180us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_DebtInstrumentAxis
= vgz_TwoThousandThirteenFacilityMember
Compensation Warrants [Member]    
Warrants issued (in shares) 166,667vgz_NonOptionEquityInstrumentsIssued
/ dei_LegalEntityAxis
= vgz_CompensationWarrantsMember