Subsequent Events (Details) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended	12 Months Ended
	Jan. 05, 2024 USD ($)	Dec. 31, 2023 USD ($) sub-stationTransformer shares	Mar. 13, 2024 USD ($) shares	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) sub-stationTransformer	Dec. 31, 2022 USD ($) sub-stationTransformer	Mar. 01, 2024 USD ($) mill
Subsequent Event [Line Items]
Cash interest paid					$ 6,212	$ 5,318
Remaining balance		$ 154,834			$ 154,834
Number of transformers to be purchased | sub-stationTransformer		1			1
Gain on sale of assets, net of commissions					$ 544	$ 3,948
Number of shares issued (in shares) | shares		523,328
Consideration received, net of issuance costs		$ 1,100
Amount available for issuance under the ATM plan		360,300			360,300
SAG Mill And Ball Mill
Subsequent Event [Line Items]
Outstanding balance		$ 12,100			$ 12,100
Sub-Station Transformer
Subsequent Event [Line Items]
Number of transformers to be purchased | sub-stationTransformer		1			1	1
Subsequent event
Subsequent Event [Line Items]
Number of shares issued (in shares) | shares			265,985
Consideration received, net of issuance costs			$ 600
Amount available for issuance under the ATM plan			$ 359,700
Subsequent event | Ball mills
Subsequent Event [Line Items]
Number of mills terminated in purchase agreement | mill							1
Subsequent event | SAG mill
Subsequent Event [Line Items]
Number of mills terminated in purchase agreement | mill							1
Subsequent event | SAG Mill And Ball Mill | Forecast
Subsequent Event [Line Items]
Outstanding balance							$ 12,100
Gain on sale of assets, net of commissions				$ 1,500
Subsequent event | The 1.25 Lien Notes
Subsequent Event [Line Items]
Principal prepaid	$ 34,700
Cash interest paid	3,300
Total payment	38,000
Remaining balance	$ 15,000
Reduction in applicable margin	0.0100