Derivatives (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($) $ / t $ / oz oz t	Dec. 31, 2021 USD ($)
Embedded Derivative [Line Items]
Unsettled sales contracts value	$ 27,731
Realized loss on embedded derivative	720	$ (777)
Realized (loss) gain	(720)	777
Unrealized gain (loss)	357	225
Trading Agreement With Auramet International LLC \| Metal And Currencies Derivatives
Embedded Derivative [Line Items]
Realized (loss) gain	(2,000)	(1,200)
Unrealized gain (loss)	$ 1,800	(1,800)
Gold
Embedded Derivative [Line Items]
Under contract \| oz	4,118
Average forward price \| $ / oz	1,752
Unsettled sales contracts value	$ 7,215
Realized (loss) gain	(79)	(47)
Unrealized gain (loss)	$ 136
Silver.
Embedded Derivative [Line Items]
Under contract \| oz	279,537
Average forward price \| $ / oz	21.45
Unsettled sales contracts value	$ 5,996
Realized (loss) gain		(44)
Unrealized gain (loss)	$ 433	(159)
Copper
Embedded Derivative [Line Items]
Under contract \| t	231
Average forward price \| $ / t	8,294
Unsettled sales contracts value	$ 1,916
Realized (loss) gain	(127)	73
Unrealized gain (loss)	$ 7	6
Lead
Embedded Derivative [Line Items]
Under contract \| t	1,386
Average forward price \| $ / t	2,018
Unsettled sales contracts value	$ 2,797
Realized (loss) gain	(150)	163
Unrealized gain (loss)	$ 153	(2)
Zinc
Embedded Derivative [Line Items]
Under contract \| t	3,268
Average forward price \| $ / t	3,001
Unsettled sales contracts value	$ 9,807
Realized loss on embedded derivative	2,000
Realized (loss) gain	(364)	632
Unrealized gain (loss)	$ (372)	$ 380
Zinc \| Minimum
Embedded Derivative [Line Items]
Call option sold price per tonne \| $ / t	3,288
Zinc \| Maximum
Embedded Derivative [Line Items]
Derivative, Average Cap Price \| $ / t	3,516

Derivative Call Option Price Per Tonne

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- Definition

Embedded Derivatives Weight Under Contract

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- Definition

Embedded Derivatives Weight Under Contract Average Forward Price

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- Definition

Embedded Derivatives Weight Under Unsettled sales contract value.

+ References

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- Definition

The amount of realized gain or loss on embedded derivative net.

+ References

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The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

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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.

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- 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 https://asc.fasb.org/extlink&oid=126954810&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 https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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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.

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