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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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