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