Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Equity securities		$ 44,152
Fair Value, Recurring
Assets:
Assets	$ 18,921	56,794
Provisional metal sales contracts \| Fair Value, Recurring
Liabilities:
Embedded Derivative, Fair Value of Embedded Derivative Liability	53	10
Embedded Derivative, Fair Value of Embedded Derivative Asset	36	299
Gold Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	7,411	12,343
SIlver Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	4,243
Equity Securities \| Fair Value, Recurring
Liabilities:
Marketable securities including warrants	7,231	44,152
Level 1 \| Fair Value, Recurring
Assets:
Assets	7,231	43,893
Level 1 \| Provisional metal sales contracts \| Fair Value, Recurring
Liabilities:
Embedded Derivative, Fair Value of Embedded Derivative Liability	0	0
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Level 1 \| Gold Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	0	0
Level 1 \| SIlver Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	0
Level 1 \| Equity Securities \| Fair Value, Recurring
Liabilities:
Marketable securities including warrants	7,231	43,893
Level 2 \| Fair Value, Recurring
Assets:
Assets	11,690	12,901
Level 2 \| Provisional metal sales contracts \| Fair Value, Recurring
Liabilities:
Embedded Derivative, Fair Value of Embedded Derivative Liability	53	10
Embedded Derivative, Fair Value of Embedded Derivative Asset	36	299
Level 2 \| Gold Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	7,411	12,343
Level 2 \| SIlver Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	4,243
Level 2 \| Equity Securities \| Fair Value, Recurring
Liabilities:
Marketable securities including warrants	0	259
Level 3 \| Fair Value, Recurring
Assets:
Assets	0	0
Level 3 \| Provisional metal sales contracts \| Fair Value, Recurring
Liabilities:
Embedded Derivative, Fair Value of Embedded Derivative Liability	0	0
Embedded Derivative, Fair Value of Embedded Derivative Asset	0	0
Level 3 \| Gold Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	0	0
Level 3 \| SIlver Forwards \| Fair Value, Recurring
Assets:
Fair value of other derivative instruments, net	0
Level 3 \| Equity Securities \| Fair Value, Recurring
Liabilities:
Marketable securities including warrants	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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Amount of investment in marketable security.

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