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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, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Assets | $ 144,695 | $ 27,171
Liabilities: |  |
Total liabilities | 255 | 24,950
Provisional metal sales contracts |  |
Assets: |  |
Fair value of other derivative instruments, net | 51 | 481
Liabilities: |  |
Fair value of derivative liability | 255 | 67
Gold zero cost collars |  |
Assets: |  |
Fair value of other derivative instruments, net | 1,560 |
Liabilities: |  |
Fair value of derivative liability |  | 24,883
Gold zero cost collars | Prepaid expenses and other | Designated as Hedging Instrument |  |
Assets: |  |
Fair value of other derivative instruments, net |  | 0
Gold zero cost collars | Accrued liabilities and other | Designated as Hedging Instrument |  |
Liabilities: |  |
Fair value of derivative liability | 0 |
Foreign Exchange Forward |  |
Assets: |  |
Fair value of other derivative instruments, net | 3,344 | 13,747
Foreign Exchange Forward | Prepaid expenses and other | Designated as Hedging Instrument |  |
Assets: |  |
Fair value of other derivative instruments, net |  | 13,747
Foreign Exchange Forward | Accrued liabilities and other | Designated as Hedging Instrument |  |
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Embedded Derivative Financial Instruments |  |
Liabilities: |  |
Fair value of derivative liability | 0 |
Equity Securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent | 139,740 | 12,943
Equity and debt securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent |  | 12,943
Level 1 |  |
Assets: |  |
Assets | 139,740 | 12,943
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Provisional metal sales contracts |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Level 1 | Gold zero cost collars |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 |
Liabilities: |  |
Fair value of derivative liability |  | 0
Level 1 | Foreign Exchange Forward |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Level 1 | Embedded Derivative Financial Instruments |  |
Liabilities: |  |
Fair value of derivative liability | 0 |
Level 1 | Equity Securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent | 139,740 |
Level 1 | Equity and debt securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent |  | 12,943
Level 2 |  |
Assets: |  |
Assets | 4,955 | 14,228
Liabilities: |  |
Total liabilities | 255 | 24,950
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument |  |
Assets: |  |
Fair value of other derivative instruments, net | 4,904 | 13,747
Level 2 | Provisional metal sales contracts |  |
Assets: |  |
Fair value of other derivative instruments, net |  | 481
Liabilities: |  |
Fair value of derivative liability |  | 67
Level 2 | Gold zero cost collars |  |
Assets: |  |
Fair value of other derivative instruments, net | 1,560 |
Liabilities: |  |
Fair value of derivative liability |  | 24,883
Level 2 | Gold zero cost collars | Accrued liabilities and other | Designated as Hedging Instrument |  |
Liabilities: |  |
Fair value of derivative liability | 0 | 24,883
Level 2 | Foreign Exchange Forward |  |
Assets: |  |
Fair value of other derivative instruments, net | 3,344 | 13,747
Level 2 | Embedded Derivative Financial Instruments |  |
Liabilities: |  |
Fair value of derivative liability | 0 |
Level 2 | Equity Securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent | 0 |
Level 2 | Equity and debt securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent |  | 0
Level 3 |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Level 3 | Provisional metal sales contracts |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Liabilities: |  |
Fair value of derivative liability | 0 | 0
Level 3 | Gold zero cost collars |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 |
Liabilities: |  |
Fair value of derivative liability |  | 0
Level 3 | Foreign Exchange Forward |  |
Assets: |  |
Fair value of other derivative instruments, net | 0 | 0
Level 3 | Embedded Derivative Financial Instruments |  |
Liabilities: |  |
Fair value of derivative liability | 0 |
Level 3 | Equity Securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent | $ 0 |
Level 3 | Equity and debt securities |  |
Liabilities: |  |
Marketable Securities, Noncurrent |  | $ 0

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