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Asset Retirement Obligation
6 Months Ended
Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Asset Retirement ObligationThe Company had a post-closure reclamation and site restoration obligation of $16,108 as of June 30, 2021. The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2020$14,996 
Additions737 
Accretion expense375 
Balance at June 30, 2021$16,108