XML 31 R17.htm IDEA: XBRL DOCUMENT v3.19.2
Asset Retirement Obligation
6 Months Ended
Jun. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation
Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $15,185 as of June 30, 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
3,301

Accretion expense
445

Settlement of liability
(1,883
)
Balance at June 30, 2019
$
15,185