Commitments and Contingencies (Details) T in Millions, $ in Millions |
9 Months Ended | ||
|---|---|---|---|
|
Sep. 29, 2020
USD ($)
|
Sep. 30, 2025
USD ($)
lawsuit
officer
plaintiff
T
|
Dec. 31, 2024
USD ($)
|
|
| Unrecorded Unconditional Purchase Obligation [Line Items] | |||
| Number of class action lawsuits | lawsuit | 4 | ||
| Number of officers | officer | 2 | ||
| Number of plaintiffs | plaintiff | 2 | ||
| Royalty payment, percentage of net profit | 4.00% | ||
| Royalty payment, annual advance | $ 0.1 | $ 0.1 | |
| Royalty payment, annual tons mined threshold | T | 5.0 | ||
| Royalty payment, maximum lease payments | $ 7.6 | 7.6 | |
| Payments for royalties to date | $ 3.3 | 3.3 | |
| Proceeds from sale of royalty to Sprott | $ 30.0 | ||
| Smelter royalty obligation, percentage | 1.50% | ||
| Royalty obligation, metal price discount rate (percent) | 5.00% | ||
| Royalty obligation | |||
| Unrecorded Unconditional Purchase Obligation [Line Items] | |||
| Royalty obligation, fair value | $ 146.7 | 146.7 | |
| Other assets, noncurrent | |||
| Unrecorded Unconditional Purchase Obligation [Line Items] | |||
| Payments for royalties to date | $ 0.6 | $ 0.6 |