XML 92 R71.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Fair Value Measurement - Realized Unrealized Derivatives, net (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | $ (1,212) | $ (246) | $ 814 | $ 204
Unrealized gain (loss) | 278 | (232) | (1,878) | (48)
Total realized/ unrealized derivatives, net | (934) | (478) | (1,064) | 156
Gold |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | (198) | (110) | (16) | (133)
Unrealized gain (loss) | (95) | 28 | (96) | 58
Total realized/ unrealized derivatives, net | (293) | (82) | (112) | (75)
Silver. |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | (141) | (295) | 13 | (123)
Unrealized gain (loss) | (81) | (11) | 30 | 10
Total realized/ unrealized derivatives, net | (222) | (306) | 43 | (113)
Copper |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | (158) | (4) | (173) | 63
Unrealized gain (loss) | 108 | (16) | 3 | (24)
Total realized/ unrealized derivatives, net | (50) | (20) | (170) | 39
Lead |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | (88) | 72 | (32) | 146
Unrealized gain (loss) | 96 | (84) | (103) | (63)
Total realized/ unrealized derivatives, net | 8 | (12) | (135) | 83
Zinc |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Realized (loss) gain | (627) | 91 | 1,022 | 251
Unrealized gain (loss) | 250 | (149) | (1,712) | (29)
Total realized/ unrealized derivatives, net | $ (377) | $ (58) | $ (690) | $ 222

X
- 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
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI http://asc.fasb.org/subtopic&trid=2229187 + Details
Name: | us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_GainLossOnSaleOfDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | goro_MetalsByTypeAxis=us-gaap_GoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | goro_MetalsByTypeAxis=goro_SilverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | goro_MetalsByTypeAxis=goro_CopperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | goro_MetalsByTypeAxis=goro_LeadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | goro_MetalsByTypeAxis=goro_ZincMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |