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Additional Comprehensive Income (Loss) Detail (Tables)
 9 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Schedule of Other Operating Cost and Expense, by Component
Pre-development, reclamation, and other consists of the following:
 Three Months Ended September 30,Nine Months Ended September 30,
In thousands2025202420252024
Silvertip ongoing carrying costs$2,617 $1,675 $7,667 $6,091 
Loss on sale of assets113 176 416 4,352 
Asset retirement accretion4,988 4,233 14,620 12,463 
Kensington royalty settlement(1)
— — (95)6,750 
Transaction costs451 976 12,161 976 
Wage and hour litigation settlement(1)
6,998 — 6,998 — 
Other676 1,523 4,190 4,769 
Pre-development, reclamation and other$15,843 $8,583 $45,957 $35,401 
(1) See Note 17 -- Commitments and Contingencies for additional details on the Kensington royalty settlement and wage and hour litigation settlement.
Schedule of Nonoperating Income (Expense)
Other, net consists of the following:
 Three Months Ended September 30,Nine Months Ended September 30,
In thousands2025202420252024
Foreign exchange gain (loss)$(2,080)$1,708 $(2,593)$3,432 
Flow-through shares112 1,248 853 5,193 
RMC bankruptcy distribution— — 38 1,199 
Other1,103 478 2,703 1,505 
Other, net$(865)$3,434 $1,001 $11,329