Agreement description.

No definition available.

Name:	USAU_AgreementDescription
Namespace Prefix:	USAU_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Agreement due date.

+ References

No definition available.

+ Details

Name:	USAU_AgreementDueDate
Namespace Prefix:	USAU_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Bonus awarded.

+ References

No definition available.

+ Details

Name:	USAU_BonusAwardedValue
Namespace Prefix:	USAU_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lease annual payment per acre.

+ References

No definition available.

+ Details

Name:	USAU_LeaseAnnualPaymentPerAcre
Namespace Prefix:	USAU_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Lease annual payment per acre thereafter.

+ References

No definition available.

+ Details

Name:	USAU_LeaseAnnualPaymentPerAcreThereafter
Namespace Prefix:	USAU_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Lease annual payment per acre third ten year term.

+ References

No definition available.

+ Details

Name:	USAU_LeaseAnnualPaymentPerAcreThirdTenYearTerm
Namespace Prefix:	USAU_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Lease renewed date.

+ References

No definition available.

+ Details

Name:	USAU_LeaseRenewedDate
Namespace Prefix:	USAU_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of base salary.

+ References

No definition available.

+ Details

Name:	USAU_PercentageOfBaseSalary
Namespace Prefix:	USAU_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of severance monthly fee.

+ References

No definition available.

+ Details

Name:	USAU_PercentageOfSeveranceMonthlyFee
Namespace Prefix:	USAU_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Severance monthly fee.

+ References

No definition available.

+ Details

Name:	USAU_SeveranceMonthlyFee
Namespace Prefix:	USAU_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LessorLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Expenditures for salaries of officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Definition

The amount of consideration recognized during the period for the milestone or milestones.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 28
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=68058744&loc=SL6892177-166501

+ Details

Name:	us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

+ Details

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

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

+ Details

Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ References

Reference 1: 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=84159872&loc=d3e21463-112644

Reference 2: 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

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TypeOfArrangementAxis=USAU_EmploymentAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=USAU_ForeignInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=USAU_MrEdwardKarrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=USAU_MrDavidRectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=USAU_MrDavidMathewsonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=USAU_MrLougeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=USAU_MoylanSeparationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=USAU_LougeeSeparationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=USAU_StateOfWyomingMiningLeaseOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=USAU_StateOfWyomingMiningLeaseTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Details Narrative)					9 Months Ended
Commitments and Contingencies (Details Narrative)	Jun. 08, 2017 USD ($) shares	Jun. 27, 2016 USD ($)	Apr. 14, 2016 USD ($)	Apr. 12, 2016 USD ($)	Jan. 31, 2018 USD ($) a $ / T
Employment Agreement [Member] \| Common Stock [Member]
Percentage of base salary		75.00%
Employment Agreement [Member] \| Cash [Member]
Percentage of base salary		25.00%
Employment Agreement [Member] \| Foreign Investor [Member] \| Minimum [Member]
Milestone amount				$ 2,500,000
Employment Agreement [Member] \| Mr. Edward Karr [Member]
Agreement description				The initial term of the agreement is for two years ending on April 30, 2018, with automatic renewals for successive one year terms unless terminated by written notice at least 90 days prior to the expiration of the term.
Agreement due date				Apr. 30, 2018
Base salary				$ 250,000
Bonus awarded				250,000
Milestone amount				$ 10,000,000
Employment Agreement [Member] \| Mr. David Rector [Member]
Agreement description			The initial term of the agreement is for one year, with automatic renewals for successive one year terms unless terminated by written notice at least 30 days prior to the expiration of the term.
Base salary			$ 15,000
Employment Agreement [Member] \| Mr. David Mathewson [Member]
Agreement description		The initial term of the agreement is for one year, with automatic renewals for successive one year terms unless terminated by written notice at least 30 days prior to the expiration of the term by either party.
Base salary		$ 200,000
Employment Agreement [Member] \| Mr. Lougee [Member]
Base salary	$ 144,000
Monthly cash payments	$ 2,500
Restricted shares awarded \| shares	500
Moylan Separation Agreement [Member]
Severance payment					$ 494,227
Severance monthly fee					$ 19,667
Moylan Separation Agreement [Member] \| Common Stock [Member]
Percentage of severance monthly fee					90.00%
Moylan Separation Agreement [Member] \| Cash [Member]
Percentage of severance monthly fee					10.00%
Lougee Separation Agreement [Member]
Severance payment	$ 221,718
State of Wyoming Mining Lease One [Member]
Area of land \| a					640
Lease renewed date					Feb. 28, 2013
Lease term					10 years
Lease annual payment per acre \| $ / T					2.00
Lease annual payment per acre third ten year term \| $ / T					3.00
Lease annual payment per acre thereafter \| $ / T					4.00
State of Wyoming Mining Lease Two [Member]
Area of land \| a					480
Lease renewed date					Feb. 28, 2014
Lease term					10 years
Lease annual payment per acre \| $ / T					2.00
Lease annual payment per acre third ten year term \| $ / T					3.00
Lease annual payment per acre thereafter \| $ / T					4.00