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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Oct. 02, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | $ 21,204,000 | $ 31,249,000 | $ 38,018,000 | $ 31,249,000 |  |  |  |  |  |
Rochester [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | 24,200,000 |  | 43,200,000 |  |  |  |  |  |  |
Rochester [Member] | Cost of Sales |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | 21,200,000 |  | 38,000,000 |  |  |  |  |  |  |
Palmarejo gold production royalty |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate deposit to be received |  |  |  |  |  |  |  |  |  | $ 22,000,000
Production to be sold, percent |  |  |  |  |  |  |  |  |  | 50.00%
Price per ounce under agreement |  |  |  |  |  |  |  |  |  | $ 800
Kensington |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue liability | $ 15,373,000 | $ 7,599,000 | $ 15,373,000 | $ 7,599,000 | $ 25,012,000 |  | $ 15,016,000 | $ 15,004,000 | $ 15,003,000 |
Kensington | December 2020 Prepayment [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue liability |  |  |  |  | $ 15,000,000 | $ 15,000,000 | $ 15,000,000 |  |  |

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