XML 59 R61.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Accounting (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs, Discount Rate | 15.00% |
Mill equipment | $ 6,500,000 | $ 10,000,000
Estimated life of mine in years | 9 years |
Level 3 percentage of fair value assets | 32.00% |
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Mill equipment | 6,500,000 | 10,000,000
Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average gold price per ounce (in dollars per ounce) | 832 |
Timing of commencement of commercial production | 2 years |
Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average gold price per ounce (in dollars per ounce) | $ 884 |
Estimated gold production (in ounces) | 615,000 |
Timing of commencement of commercial production | 4 years |

X
- Definition Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date. + 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Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_AssetsHeldForSaleAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated life of mine in years. + References No definition available. + Details
Name: | vgz_EstimatedLifeOfMineInYears
Namespace Prefix: | vgz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of estimated gold production, used as an input to measure fair value. + References No definition available. + Details
Name: | vgz_FairValueInputsEstimatedGoldProduction
Namespace Prefix: | vgz_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price per ounce, used as an input to measure fair value. + References No definition available. + Details
Name: | vgz_FairValueInputsPricePerOunce
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The estimated time period that gold production will commence, used as an input to measure fair value. + References No definition available. + Details
Name: | vgz_FairValueInputsTimingOfCommencementOfCommercialProduction
Namespace Prefix: | vgz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of total fair value assets that are classified as level 3. + References No definition available. + Details
Name: | vgz_Level3PercentageOfFairValueAssets
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant