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Condensed Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating income and (expenses):      
Exploration, property evaluation and holding costs $ (3,991)us-gaap_ExplorationExpenseMining $ (15,600)us-gaap_ExplorationExpenseMining $ (27,536)us-gaap_ExplorationExpenseMining
Corporate administration and investor relations (3,798)us-gaap_GeneralAndAdministrativeExpense (5,528)us-gaap_GeneralAndAdministrativeExpense (8,096)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization (863)us-gaap_DepreciationAndAmortization (1,021)us-gaap_DepreciationAndAmortization (589)us-gaap_DepreciationAndAmortization
Gain/(loss) on disposal of mineral property, net (Note 4 and 5)     2,934vgz_GainLossOnDispositionOfMineralPropertyNetOfCosts
Write-down of mineral property (750)us-gaap_ImpairmentOfOngoingProject   (250)us-gaap_ImpairmentOfOngoingProject
Write-down of Amayapampa (4,813)us-gaap_OtherAssetImpairmentCharges    
Total operating income/(expense) (14,215)us-gaap_OperatingIncomeLoss (22,149)us-gaap_OperatingIncomeLoss (33,537)us-gaap_OperatingIncomeLoss
Non-operating income and (expenses):      
Gain/(loss) on sale of marketable securities 24us-gaap_MarketableSecuritiesRealizedGainLoss (54)us-gaap_MarketableSecuritiesRealizedGainLoss 192us-gaap_MarketableSecuritiesRealizedGainLoss
Realized gain on other investments (Note 4) 155us-gaap_GainLossOnSaleOfInvestments    
Unrealized gain/(loss) on other investments (Note 4) (4,267)us-gaap_UnrealizedGainLossOnInvestments (48,499)us-gaap_UnrealizedGainLossOnInvestments (50,363)us-gaap_UnrealizedGainLossOnInvestments
Write down of marketable securities (138)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount (275)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount (39)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
Write-down of plant and equipment (3,500)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf (3,500)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf (7,117)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Interest income 10us-gaap_InvestmentIncomeInterest 36us-gaap_InvestmentIncomeInterest 45us-gaap_InvestmentIncomeInterest
Interest expense (78)us-gaap_InterestExpense (547)us-gaap_InterestExpense  
Other income/(expense) (417)us-gaap_OtherCostAndExpenseOperating 127us-gaap_OtherCostAndExpenseOperating 16us-gaap_OtherCostAndExpenseOperating
Total non-operating income/(expense) (4,711)us-gaap_NonoperatingIncomeExpense (52,712)us-gaap_NonoperatingIncomeExpense (57,266)us-gaap_NonoperatingIncomeExpense
Income/(loss) from continuing operations before income taxes (18,926)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (74,861)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (90,803)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Deferred income tax benefit/(expense)   15,373us-gaap_DeferredIncomeTaxExpenseBenefit 20,147us-gaap_DeferredIncomeTaxExpenseBenefit
Net income/(loss) (18,926)us-gaap_NetIncomeLoss (59,488)us-gaap_NetIncomeLoss (70,656)us-gaap_NetIncomeLoss
Other comprehensive income/(loss):      
Unrealized fair value increase/(decrease) on available-for-sale securities 70us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (61)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (173)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Comprehensive income/(loss) $ (18,856)us-gaap_ComprehensiveIncomeNetOfTax $ (59,549)us-gaap_ComprehensiveIncomeNetOfTax $ (70,829)us-gaap_ComprehensiveIncomeNetOfTax
Basic:      
Weighted average number of basic shares outstanding (in shares) 82,294,331us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 81,813,386us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 74,351,065us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income/(loss) per share (in dollars per share) $ (0.23)us-gaap_EarningsPerShareBasic $ (0.73)us-gaap_EarningsPerShareBasic $ (0.95)us-gaap_EarningsPerShareBasic
Diluted:      
Weighted average number of diluted shares outstanding (in shares) 82,294,331us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 81,813,386us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 74,351,065us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income/(loss) per share (in dollars per share) $ (0.23)us-gaap_EarningsPerShareDiluted $ (0.73)us-gaap_EarningsPerShareDiluted $ (0.95)us-gaap_EarningsPerShareDiluted