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Reclamation
 6 Months Ended
Jun. 30, 2026
Asset Retirement Obligation Disclosure [Abstract]  
RECLAMATION RECLAMATION
Reclamation and mine closure costs are based principally on legal and regulatory requirements. Management estimates costs associated with reclamation of mining properties and assesses its financial capacity to meet closure requirement obligations. On an ongoing basis, management evaluates its estimates and assumptions, and future expenditures could differ from current estimates. The asset retirement obligation increased in 2026 due to increased reclamation and mine closure costs associated with New Afton and Rainy River.
Changes to the Company’s asset retirement obligations for its operating sites are as follows:
Three Months Ended June 30,Six Months Ended June 30,
In thousands2026202520262025
Asset retirement obligation - Beginning$420,051 $272,512 $277,511 $260,492 
Accretion6,088 4,900 10,927 9,632 
Additions and changes to estimates— — 139,159 8,644 
Settlements(2,676)(2,380)(4,134)(3,736)
Asset retirement obligation - Ending$423,463 $275,032 $423,463 $275,032