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Asset Retirement Obligation
6 Months Ended
Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $9,476 as of June 30, 2018. The following is a reconciliation of the total reclamation liability for asset retirement obligations:
 
 
Balance at December 31, 2017
$
8,982

Additions and revisions of prior estimates
2,086

Accretion expense
191

Settlement of liability
(1,783
)
Balance at June 30, 2018
$
9,476