XML 41 R25.htm IDEA: XBRL DOCUMENT
v3.20.2

Mineral Properties - Guadalupe (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |
Mineral properties, Net |  | $ 2,146 | $ 2,146 | $ 2,146
Deferred option gain |  | 68 | 68 | $ 168
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  | 3,540 | 6,108 |
Guadalupe De Los Reyes, Mexico | Option Agreement Two |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Sale price of gold/silver project | $ 1,500 |  |  |
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights |  | 2,100 |  |
Deferred option gain |  | 2,892 | $ 2,892 |
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  | 3,540 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-31 | Guadalupe De Los Reyes, Mexico | Option Agreement Two |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights |  | 1,100 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-31 | Guadalupe De Los Reyes, Mexico | Option Agreement Two |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights |  | $ 1,000 |  |

X
- Definition Mineral properties, net of adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_MineralPropertiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Current amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References No definition available. + Details
Name: | vgz_DeferredGainOnSaleOfPropertyCurrent
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gain (Loss) On Disposal Of Mineral Property Interests, Net + References No definition available. + Details
Name: | vgz_GainLossOnDisposalOfMineralPropertyInterestsNet
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments Received In Lieu Of Grant Of Royalty And Back-In Rights + References No definition available. + Details
Name: | vgz_PaymentsReceivedInLieuOfGrantOfRoyaltyAndBackInRights
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale price of gold/silver project. + References No definition available. + Details
Name: | vgz_SalePriceOfGoldProject
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_TransactionTypeAxis=vgz_OptionAgreementTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2021-01-31
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2021-07-31
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |