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Fair Value Measurement - Realized Unrealized Derivatives, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Realized gain (loss)	$ 20	$ 345	$ 76	$ 1,334
Unrealized (loss) gain	258	(399)	322	(241)
Total realized/unrealized derivatives, net	278	(54)	398	1,093
Gold
Derivatives, Fair Value [Line Items]
Realized gain (loss)	61	57	145	443
Unrealized (loss) gain	37	(6)	93	(42)
Total realized/unrealized derivatives, net	98	51	238	401
Silver
Derivatives, Fair Value [Line Items]
Realized gain (loss)	10	130	70	415
Unrealized (loss) gain	164	(215)	148	(83)
Total realized/unrealized derivatives, net	174	(85)	218	332
Copper
Derivatives, Fair Value [Line Items]
Realized gain (loss)	(10)	(48)	(1)	79
Unrealized (loss) gain	11	34	16	(13)
Total realized/unrealized derivatives, net	1	(14)	15	66
Lead
Derivatives, Fair Value [Line Items]
Realized gain (loss)	(5)	46	(16)	39
Unrealized (loss) gain		(68)	22	6
Total realized/unrealized derivatives, net	(5)	(22)	6	45
Zinc
Derivatives, Fair Value [Line Items]
Realized gain (loss)	(36)	160	(122)	358
Unrealized (loss) gain	46	(144)	43	(109)
Total realized/unrealized derivatives, net	$ 10	$ 16	$ (79)	$ 249

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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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.

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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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