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Liquidity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2013	Jan. 31, 2014	Oct. 18, 2013	Dec. 31, 2014 Maximum [Member]	Dec. 31, 2014 Minimum [Member]
Cash Burn Rate per Quarter	$ 3,250			$ 3,000	$ 2,500
Approximate Value of Debt Before Paydown			9,700
Approximate Value of Debt After Paydown		3,700	6,700
Expected Debt Paydown		3,000
Final Payment for Sale of Mineral Property		$ 6,000

X

- Definition

The approximate value of debt the company owes after a paydown of principal.

+ References

No definition available.

+ Details

Name:	vgz_ApproximateValueOfDebtAfterPaydown
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The approximate value of debt the company owes before a paydown of principal.

+ References

No definition available.

+ Details

Name:	vgz_ApproximateValueOfDebtBeforePaydown
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The rate at which cash will be used or spent by the company per quarter.

+ References

No definition available.

+ Details

Name:	vgz_CashBurnRatePerQuarter
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The expected amount to be paid down on the company's debt.

+ References

No definition available.

+ Details

Name:	vgz_ExpectedDebtPaydown
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The final payment amount for the sale of a mineral property held by the company.

+ References

No definition available.

+ Details

Name:	vgz_FinalPaymentForSaleOfMineralProperty
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant