Basis of Preparation of Financial Statements and Nature of Operations (Details) - property	6 Months Ended
Jun. 30, 2020	Apr. 09, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Percentage of Interest Owned in Rodeo Properties	100.00%
Number of Exploration Properties	12
Velardena properties
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
El Quevar Project
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Barrick Earn-In Agreement \| El Quevar Project
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Investment ownership percentage		70.00%

Represents the number of exploration properties.

No definition available.

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- Definition

The percentage of ownership interest owned in Rodeo properties.

+ References

No definition available.

+ Details

Name:	aumn_PercentageOfInterestOwnedInRodeoProperties
Namespace Prefix:	aumn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

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Period Type:	instant

- 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

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- Details

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- Details

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Namespace Prefix:
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- Details

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