Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets:
Assets, fair value disclosure	$ 4,028
Liabilities:
Liabilities, fair value disclosure	3,892
Level 1
Assets:
Assets, fair value disclosure	0
Liabilities:
Liabilities, fair value disclosure	0
Level 2
Assets:
Assets, fair value disclosure	4,028
Liabilities:
Liabilities, fair value disclosure	3,892
Level 3
Assets:
Assets, fair value disclosure	0
Liabilities:
Liabilities, fair value disclosure	0
Provisional metal sales contracts
Assets:
Derivative asset	317	$ 1,103
Liabilities:
Derivative liability	3,322	124
Provisional metal sales contracts | Level 1
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	0
Provisional metal sales contracts | Level 2
Assets:
Derivative asset	317	1,103
Liabilities:
Derivative liability		124
Provisional metal sales contracts | Level 3
Assets:
Derivative asset	0	0
Liabilities:
Derivative liability	0	$ 0
Gold and copper swap contracts
Assets:
Derivative asset	3,711
Liabilities:
Derivative liability	570
Gold and copper swap contracts | Level 1
Assets:
Derivative asset	0
Liabilities:
Derivative liability	0
Gold and copper swap contracts | Level 2
Assets:
Derivative asset	3,711
Liabilities:
Derivative liability	570
Gold and copper swap contracts | Level 3
Assets:
Derivative asset	0
Liabilities:
Derivative liability	0
Provisional gold and copper sales contracts
Assets:
Derivative asset	317
Provisional gold and copper sales contracts | Level 2
Liabilities:
Derivative liability	$ 3,322