The highest interest rate charged on contract receivables maturing after one year.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 310
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the back in right percentage granting entity the right to assume a specified non-carried interest in an underground project if counterparty in option agreement decides to develop an underground mine.

+ References

No definition available.

+ Details

Name:	vgz_BackInRightPercentage
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the gold price per ounce.

+ References

No definition available.

+ Details

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

- Definition

The number of successive payments per option agreement.

+ References

No definition available.

+ Details

Name:	vgz_NumberOfSuccessivePayments
Namespace Prefix:	vgz_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of interest in project that the counterparty has the exclusive right and option right to earn per the option agreement.

+ References

No definition available.

+ Details

Name:	vgz_PercentageOfInterestPerOptionAgreement
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of net smelter return royalty on any future productions from specified claims.

+ References

No definition available.

+ Details

Name:	vgz_PercentageOfNetSmelterReturnRoyalty
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership interest if terms of option agreement are not fulfilled.

+ References

No definition available.

+ Details

Name:	vgz_PercentageOfOwnershipInterestIfTermsOfOptionAgreementNotFulfilled
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership to be transferred to counterparty upon timely making all option payments and fulfilling other obligations with respect to Option Agreement.

+ References

No definition available.

+ Details

Name:	vgz_PercentageOfOwnershipToBeTransferred
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the aggregate amount of royalty payments to be received.

+ References

No definition available.

+ Details

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

- 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

- Definition

The amount of the carrying value for the remaining option payment proceeds to be recognized as a contract liability until the title has been transferred to the buyer or the option agreement has been terminated.

+ References

No definition available.

+ Details

Name:	vgz_ValueOfCarryingValueForOptionPaymentProceedsToBeRecognizedAsContractLiability
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

Name:	us-gaap_TransactionTypeAxis=vgz_OptionAgreementTwoMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis=2018-10-01
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_ProductOrServiceAxis=vgz_OpenPitMiningMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=vgz_ExecutionOfOptionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=vgz_OneYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_StatementScenarioAxis=vgz_TwoYearAnniversaryMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_StatementScenarioAxis=vgz_BeforeFourYearAnniversaryMember
Namespace Prefix:
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Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_ProductOrServiceAxis=vgz_UndergroundMiningMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	srt_OwnershipAxis=vgz_MineraGoldStakeSDeCVMember
Namespace Prefix:
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Mineral Properties, Guadalupe (Details)			1 Months Ended		3 Months Ended
Mineral Properties, Guadalupe (Details)	Jan. 23, 2019 USD ($)	Oct. 24, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($) item	Mar. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Proceeds from option/sale agreements, net					$ 100,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two
Property, Plant and Equipment [Line Items]
Interest has right to earn (as a percent)				100.00%
Sale price of gold/silver project				$ 6,000,000
Number of successive payments \| item				2
Back in Right (as a percent)				49.00%
Ownership interest if terms of option agreement not fulfilled (as a percent)				0.00%
Ownership to be transferred (as a percent)				100.00%
Proceeds from option/sale agreements, net	$ 100,000	$ 50,000	$ 150,000	$ 1,500,000
Value of carrying value for option payment proceeds to be recognized as contract liability					$ 0
Interest rate (as a percent)			1.50%
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Property, Plant and Equipment [Line Items]
Future payment			$ 1,500,000
Timing of future payment			6 months
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Open Pit Mining
Property, Plant and Equipment [Line Items]
Aggregate royalty payments to be received				2,000,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Execution of Option Agreement
Property, Plant and Equipment [Line Items]
Sale price of gold/silver project				1,500,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| One Year Anniversary
Property, Plant and Equipment [Line Items]
Sale price of gold/silver project				1,500,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Two Year Anniversary
Property, Plant and Equipment [Line Items]
Sale price of gold/silver project				1,500,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Before Four Year Anniversary
Property, Plant and Equipment [Line Items]
Sale price of gold/silver project				$ 1,500,000
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Minimum \| Open Pit Mining
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)				1.00%
Gold price (USD per ounce)				$ 1,600
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Minimum \| Underground Mining
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)				1.00%
Gold price (USD per ounce)				$ 1,600
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Maximum \| Open Pit Mining
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)				2.00%
Gold price (USD per ounce)				$ 1,400
Guadalupe De Los Reyes, Mexico \| Option Agreement Two \| Maximum \| Underground Mining
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)				2.00%
Gold price (USD per ounce)				$ 1,400
Guadalupe De Los Reyes, Mexico \| Minera Gold Stake S A de C V \| Option Agreement Two
Property, Plant and Equipment [Line Items]
Ownership interest (as a percent)				100.00%