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Asset Retirement Obligation
3 Months Ended
Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $8,117 as of March 31, 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
250

Accretion expense
134

Settlement of liability
(1,249
)
Balance at March 31, 2018
$
8,117