Value added tax receivable, net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
VAT receivables offset against VAT payable		$ 73
Mexico
VAT receivables offset against VAT payable	$ 23

Carrying amount as of the balance sheet date of value added taxes receivable that have been offset against value added taxes payable.

No definition available.

Name:	aumn_ValueAddedTaxReceivableOffsetAgainstPayables
Namespace Prefix:	aumn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant