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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Oct. 02, 2014
Business Acquisition [Line Items] |  |  |  |  |  |
Inventory Write-down | $ 7,595,000 | $ 0 |  |  |  |
Rochester [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Inventory Write-down | 8,600,000 |  |  |  |  |
Rochester [Member] | Cost of Sales |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Inventory Write-down | 7,600,000 |  |  |  |  |
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 | $ 25,155,000 | $ 7,104,000 | $ 15,016,000 |  | $ 15,003,000 |
Kensington | December 2020 Prepayment [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue liability |  |  | $ 15,000,000 | $ 15,000,000 |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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