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Summary of Significant Accounting Policies Summary of Unearned Income (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Oct. 02, 2014
Contract Liabilities |  |  |
Deferred Revenue Recognized | $ 315,000 | $ 8,346,000 |
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 | 8,150,000 | 9,376,000 |
Deferred Revenue Recognized | (315,000) | (346,000) |
Closing Balance | 7,835,000 | 9,030,000 |
Kensington |  |  |
Contract Liabilities |  |  |
Opening Balance | 15,016,000 | 15,003,000 |
Deferred Revenue, Additions | 10,139,000 | 101,000 |
Deferred Revenue Recognized | 0 | (8,000,000) |
Closing Balance | 25,155,000 | $ 7,104,000 |
Kensington | December 2020 Prepayment [Member] |  |  |
Contract Liabilities |  |  |
Opening Balance | $ 15,000,000 |  |

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