Contingencies - Additional Information (Details) - USD ($)		3 Months Ended	12 Months Ended				159 Months Ended
	Feb. 14, 2023	Dec. 31, 2018	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2016	Dec. 31, 2024
Loss Contingencies [Line Items]
Other current liabilities			$ 26,794,000	$ 28,472,000			$ 26,794,000
Other liabilities			15,303,000	12,108,000			15,303,000
EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Payments made				1,900,000
New Idria Mercury Mine [Member]
Loss Contingencies [Line Items]
Financial assurance required to be provided to EPA to secure performance		$ 2,000,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Payments made				100,000
Total reserve			4,400,000				4,400,000
Other current liabilities			300,000				300,000
Other liabilities			4,100,000				4,100,000
Expense recognized			0	$ 0
Revised estimated project cost			$ 9,000,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Original estimated project costs						$ 3,300,000
New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Original estimated project costs						$ 4,400,000
Scepter Company [Member] | Ms.McCartney [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 30,000
Selling, General and Administrative Expenses [Member] | New Almaden Mine (Formerly Referred to as Guadalupe River Watershed) [Member] | Natural Resource Damage Claim [Member]
Loss Contingencies [Line Items]
Loss contingency, Loss in period					$ 3,000,000
Pending Litigation [Member] | New Idria Mercury Mine [Member] | EPA Notice Letter [Member]
Loss Contingencies [Line Items]
Insurance recoveries							6,200,000
Loss contingency, Loss in period							25,100,000
Payments made							$ 14,600,000