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Reclamation
9 Months Ended
Sep. 30, 2020
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. On an ongoing basis, management evaluates its estimates and assumptions, and future expenditures could differ from current estimates.
    Changes to the Company’s asset retirement obligations for its operating sites are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
In thousands2020201920202019
Asset retirement obligation - Beginning$138,904 $137,545 $134,543 $133,508 
Accretion2,924 3,024 8,591 8,878 
Settlements(930)(833)(2,236)(2,650)
Asset retirement obligation - Ending$140,898 $139,736 $140,898 $139,736 
    The Company accrued $1.8 million and $1.9 million at each of September 30, 2020 and December 31, 2019, respectively, for reclamation liabilities related to former mining activities, which are included in Reclamation.