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Asset Retirement Obligation (Tables)
9 Months Ended
Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of total reclamation liability for asset retirement obligations
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
3,301

Accretion expense
623

Settlement of liability
(2,348
)
Balance at September 30, 2019
$
14,897