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Asset Retirement Obligation
6 Months Ended
Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $6,293 as of June 30, 2020. The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2019$6,142  
Accretion expense151  
Balance at June 30, 2020$6,293