Commitments and Contingencies (Details) $ in Thousands, T in Millions |
12 Months Ended | |||
---|---|---|---|---|
Sep. 29, 2020
USD ($)
|
May 29, 2020
USD ($)
|
Dec. 31, 2023
USD ($)
T
|
Dec. 31, 2022
USD ($)
|
|
Unrecorded Unconditional Purchase Obligation [Line Items] | ||||
Royalty payment, percentage of net profit | 4.00% | 4.00% | ||
Royalty payment, annual advance | $ 120 | |||
Royalty payment, additional incremental payment | $ 120 | |||
Royalty payment, annual tons mined threshold | T | 5.0 | |||
Royalty payment, maximum lease payments | $ 7,600 | |||
Payments to acquire royalty interests in mining properties | $ 3,300 | $ 3,300 | ||
Proceeds from sale of royalty to Sprott | $ 30,000 | $ 30,000 | ||
Smelter royalty obligation, percentage | 1.50% | 1.50% | ||
Royalty obligation, metal price discount rate | 5.00% | |||
Royalty obligation | ||||
Unrecorded Unconditional Purchase Obligation [Line Items] | ||||
Royalty obligation, fair value | $ 146,700 | 146,700 | ||
Other assets, noncurrent | ||||
Unrecorded Unconditional Purchase Obligation [Line Items] | ||||
Payments to acquire royalty interests in mining properties | $ 600 | $ 600 |