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v3.20.4

Nature of Operations (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020
Mt Todd, Australia |
Property, Plant and Equipment [Line Items] |
Percentage of ownership in project | 100.00%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of ownership by the entity in the project. + References No definition available. + Details
Name: | vgz_PercentageOfProjectOwned
Namespace Prefix: | vgz_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=vgz_MtToddAustraliaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |