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Mineral property (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	1 Months Ended	12 Months Ended
	Mar. 31, 2015	Jan. 31, 2015	Dec. 31, 2014
Payments to acquire interest in joint venture	$ 5,000us-gaap_PaymentsToAcquireInterestInJointVenture
Common Stock Shares Outstanding	82,390,217us-gaap_CommonStockSharesOutstanding		82,390,217us-gaap_CommonStockSharesOutstanding
Percentage of outstanding common shares	90.00%us-gaap_MinorityInterestOwnershipPercentageByParent
Cangold Limited [Member]
Percentage of additional interest in joint venture to be earned	30.00%vgz_PercentageOfAdditionalInterestInJointVentureToBeEarned / dei_LegalEntityAxis = vgz_CangoldLimitedMember
Additional payment to acquire interest in joint venture	3,000vgz_AdditionalPaymentToAcquireInterestInJointVenture / dei_LegalEntityAxis = vgz_CangoldLimitedMember
Percentage of interest in joint venture to be returned upon election not to make payment	70.00%vgz_PercentageOfInterestInJointVentureToBeReturnedUponElectionNotToMakePayment / dei_LegalEntityAxis = vgz_CangoldLimitedMember
Midas Gold Corp [Member]
Common Stock Shares Outstanding			31,802,615us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = vgz_MidasGoldCorpMember
Los Cardones, Mexico [Member]
Payments to acquire interest in joint venture		3,000us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = vgz_ConcordiaMexicoMember
Additional payment to acquire interest in joint venture			500vgz_AdditionalPaymentToAcquireInterestInJointVenture / dei_LegalEntityAxis = vgz_ConcordiaMexicoMember
First Year [Member] | Cangold Limited [Member]
Payments to acquire interest in joint venture	1,000us-gaap_PaymentsToAcquireInterestInJointVenture / vgz_JointVentureInstallmentPaymentsAxis = vgz_FirstYearMember / dei_LegalEntityAxis = vgz_CangoldLimitedMember
Second Year [Member] | Cangold Limited [Member]
Payments to acquire interest in joint venture	1,500us-gaap_PaymentsToAcquireInterestInJointVenture / vgz_JointVentureInstallmentPaymentsAxis = vgz_SecondYearMember / dei_LegalEntityAxis = vgz_CangoldLimitedMember
Third Year [Member] | Cangold Limited [Member]
Payments to acquire interest in joint venture	$ 2,500us-gaap_PaymentsToAcquireInterestInJointVenture / vgz_JointVentureInstallmentPaymentsAxis = vgz_ThirdYearMember / dei_LegalEntityAxis = vgz_CangoldLimitedMember

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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+ Details

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X

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

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- Definition

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