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Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 02, 2014
Contract Liabilities |  |  |  |  |
Deferred Revenue Recognized | $ 307,000 | $ 5,485,000 | $ 15,908,000 | $ 21,167,000 |
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 | 8,775,000 | 10,389,000 | 9,376,000 | 11,061,000 |
Deferred Revenue Recognized | (307,000) | (393,000) | (908,000) | (1,065,000) |
Closing Balance | 8,468,000 | 9,996,000 | 8,468,000 | 9,996,000 |
Kensington |  |  |  |  |
Contract Liabilities |  |  |  |  |
Opening Balance | 15,004,000 | 15,006,000 | 15,003,000 | 15,010,000 |
Deferred Revenue, Additions | 95,000 | 108,000 | 15,096,000 | 15,114,000 |
Deferred Revenue Recognized | 7,500,000 | 5,200,000 | (22,500,000) | (20,210,000) |
Closing Balance | 7,599,000 | $ 9,914,000 | 7,599,000 | $ 9,914,000 |
Kensington | December 2020 Prepayment [Member] |  |  |  |  |
Contract Liabilities |  |  |  |  |
Opening Balance | $ 15,000,000 |  | 15,000,000 |  |
Deferred Revenue Recognized |  |  | $ 15,000,000 |  |

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