Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Oct. 02, 2014
Business Acquisition [Line Items]
Inventory Write-down	$ 9,219,000	$ 0	$ 16,814,000	$ 0
Rochester [Member]
Business Acquisition [Line Items]
Inventory Write-down	10,400,000		19,000,000
Rochester [Member] | Cost of Sales
Business Acquisition [Line Items]
Inventory Write-down	9,200,000		16,800,000
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	$ 25,012,000	$ 15,004,000	$ 25,012,000	$ 15,004,000	$ 25,155,000	$ 15,016,000	$ 7,104,000	$ 15,003,000
Kensington | December 2020 Prepayment [Member]
Business Acquisition [Line Items]
Revenue liability					$ 15,000,000	$ 15,000,000