Commitments and Contigencies (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Oct. 02, 2014
Business Acquisition [Line Items]
Palmarejo Gold Stream Agreement, Deferred Revenue Unamortized Balance	$ 7,700,000			$ 7,700,000
Deferred Revenue Recognized	241,000		$ 7,255,000	556,000	$ 15,601,000
Common stock issued under "at the market" stock offering		$ 98,499,000	118,777,000
Total estimated project capital cost				600,000,000
Surety Bonds Outstanding	315,000,000			315,000,000		$ 315,100,000
Capital Expenditures Incurred but Not yet Paid				350,000,000
Valued-added Tax Outstanding	26,000,000			26,000,000
Long-term Purchase Commitment, Capital Commitment Since Inception				523,000,000
Contract With Customer, Liability, Additional Prepayment	10,000,000			10,000,000
Palmarejo gold production royalty
Business Acquisition [Line Items]
Production to be sold, percent									50.00%
Price per ounce under agreement									$ 800
Aggregate deposit to be received									$ 22,000,000
Kensington
Business Acquisition [Line Items]
Deferred Revenue Recognized	(454,000)		(7,000,000)	(454,000)	(15,000,000)
Revenue liability	25,012,000	25,155,000	$ 15,004,000	25,012,000	$ 15,004,000	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
Kensington | June 2021 Prepayment
Business Acquisition [Line Items]
Revenue liability	$ 10,000,000			$ 10,000,000		15,000,000
Contract With Customer, Liability, Future Prepayments						$ 25,000,000