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Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Oct. 02, 2014
Contract Liabilities |  |  |  |  |
Deferred Revenue Recognized | $ 10,167,000 | $ 307,000 | $ 10,723,000 | $ 15,908,000 |
Palmarejo gold production royalty |  |  |  |  |
Contract Liabilities |  |  |  |  |
Aggregate deposit to be received |  |  |  |  | $ 22,000,000
Price per ounce under agreement |  |  |  |  | $ 800
Production to be sold, percent |  |  |  |  | 50.00%
Franco-Nevada |  |  |  |  |
Contract Liabilities |  |  |  |  |
Opening Balance | 7,742,000 | 8,775,000 | 8,150,000 | 9,376,000 |
Deferred Revenue Recognized | (167,000) | (307,000) | (575,000) | (908,000) |
Closing Balance | 7,575,000 | 8,468,000 | 7,575,000 | 8,468,000 |
Kensington |  |  |  |  |
Contract Liabilities |  |  |  |  |
Opening Balance | 25,012,000 | 15,004,000 | 15,016,000 | 15,003,000 |
Deferred Revenue, Additions | 361,000 | 95,000 | 10,811,000 | 15,096,000 |
Deferred Revenue Recognized | (10,000,000) | (7,500,000) | (10,454,000) | (22,500,000) |
Closing Balance | 15,373,000 | $ 7,599,000 | 15,373,000 | $ 7,599,000 |
Kensington | December 2020 Prepayment [Member] |  |  |  |  |
Contract Liabilities |  |  |  |  |
Opening Balance | $ 15,000,000 |  | $ 15,000,000 |  |

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