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Covid-19 (Details) $ in Millions	6 Months Ended
Covid-19 (Details) $ in Millions	Jun. 30, 2020 USD ($)
ATM Agreement
Proceeds from sale of common stock	$ 11.9

X

- Definition

The amount of proceeds from sale of common stock.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=goro_AtMarketOfferingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: