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Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating income and (expenses):    
Exploration, property evaluation and holding costs $ (975)us-gaap_ExplorationExpenseMining $ (1,418)us-gaap_ExplorationExpenseMining
Corporate administration (1,044)us-gaap_GeneralAndAdministrativeExpense (1,275)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization (191)us-gaap_DepreciationAndAmortization (217)us-gaap_DepreciationAndAmortization
Gain on disposal of mineral property, net 1,958vgz_GainLossOnDispositionOfMineralPropertyNetOfCosts  
Total operating expense (252)us-gaap_OperatingIncomeLoss (2,910)us-gaap_OperatingIncomeLoss
Non-operating income and (expenses):    
Gain/(loss) on sale of marketable securities 12us-gaap_MarketableSecuritiesRealizedGainLoss 13us-gaap_MarketableSecuritiesRealizedGainLoss
Unrealized gain/(loss) on other investments (Note 4) (390)us-gaap_UnrealizedGainLossOnInvestments 2,054us-gaap_UnrealizedGainLossOnInvestments
Realized gain on other investments, net (Note 4) (348)us-gaap_GainLossOnSaleOfInvestments 155us-gaap_GainLossOnSaleOfInvestments
Interest income 1us-gaap_InvestmentIncomeInterest 4us-gaap_InvestmentIncomeInterest
Interest expense   (78)us-gaap_InterestExpense
Other Nonoperating Income (Expense) 30us-gaap_OtherNonoperatingIncomeExpense (378)us-gaap_OtherNonoperatingIncomeExpense
Total non-operating income/(expense) (695)us-gaap_NonoperatingIncomeExpense 1,770us-gaap_NonoperatingIncomeExpense
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollinginterest (947)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (1,140)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income/(loss) (947)us-gaap_NetIncomeLoss (1,140)us-gaap_NetIncomeLoss
Other comprehensive gain/(loss):    
Unrealized fair value increase/(decrease) on available-for-sale securities (24)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 53us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Comprehensive income/(loss) $ (971)us-gaap_ComprehensiveIncomeNetOfTax $ (1,087)us-gaap_ComprehensiveIncomeNetOfTax
Basic:    
Weighted average number of basic shares outstanding (in shares) 82,390,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 82,275,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income/(loss) per share, Basic $ (0.01)us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic
Diluted:    
Weighted average number of diluted shares outstanding (in shares) 82,390,217us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 82,275,217us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income/(loss) per share, Diluted $ (0.01)us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted