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COVID-19 Pandemic (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
COVID-19 Pandemic
COVID-19 specific costs	$ 0.1

X

- Definition

The amount of COVID 19 Specific costs.

+ References

No definition available.

+ Details

Name:	goro_Covid19SpecificCosts
Namespace Prefix:	goro_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration