XML 67 R56.htm IDEA: XBRL DOCUMENT v2.4.0.6

Fair Value Of Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate	15.00%
Level 3 percentage of fair value assets	15.00%
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average gold price per ounce (in dollars per ounce)	1,038
Estimated gold production (in ounces)	350,000
Timing of commencement of commercial production	3 years
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average gold price per ounce (in dollars per ounce)	1,247
Estimated gold production (in ounces)	650,000
Timing of commencement of commercial production	6 years

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

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