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Reclamation (Tables)
3 Months Ended
Mar. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Changes to the Company’s asset retirement obligations are as follows:
Three Months Ended March 31,
In thousands20222021
Asset retirement obligation - Beginning$181,888 $139,274 
Accretion3,457 2,908 
Settlements(1,019)(770)
Asset retirement obligation - Ending$184,326 $141,412