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Asset Retirement Obligation
3 Months Ended
Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $12,253 as of March 31, 2019. The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2018
$
13,322

Additions and revisions of prior estimates
(113
)
Accretion expense
279

Settlement of liability
(1,235
)
Balance at March 31, 2019
$
12,253