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Mineral property (GDLR) (Details) - Guadalupe de los Reyes, Mexico [Member] - USD ($) $ in Thousands	1 Months Ended
	Mar. 31, 2015	Apr. 30, 2014
Sale price of gold project		$ 5,000
Period of payment		3 years
Additional interest to be earned (as a percent)		30.00%
Interest to be returned upon election not to make payment (as a percent)		70.00%
Future proceeds		$ 3,000
First Year [Member]
Sale price of gold project		1,000
Proceeds from sale of gold project	$ 500
Second Year [Member]
Sale price of gold project		1,500
Third Year [Member]
Sale price of gold project		$ 2,500

X

- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 12



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents proceeds that will be received in the future from the sale of an assets.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of additional interest to be earned.

+ References

No definition available.

+ Details

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Namespace Prefix:	vgz_
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Balance Type:	na
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X

- Definition

Percentage of interest to be returned upon election not to make payment.

+ References

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+ Details

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X

- Definition

Period of payment

+ References

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+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Sale price of gold project.

+ References

No definition available.

+ Details

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

X

- Details

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- Details

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- Details

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- Details

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