Asset Retirement Obligations

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligations

Asset Retirement Obligations

NOTE 12—Asset Retirement Obligations

        As of December 31, 2013 and 2012, asset retirement obligation accruals for mine reclamation and closure costs were $116.4 million and $89.5 million, respectively. The portion of the costs expected to be paid within a year of $23.9 million and $12.3 million as of December 31, 2013 and 2012, respectively, is included in other current liabilities. The portion of costs expected to be incurred beyond one year of $92.5 million and $77.2 million as of December 31, 2013 and 2012, respectively, is included in other long-term liabilities. There were no assets that were legally restricted for purposes of settling asset retirement obligations at December 31, 2013 or 2012.

        Changes in the asset retirement obligations are as follows:

	December 31,
	2013			2012
Balance at beginning of year	$	89,478		$	74,963
Accretion expense		9,079			4,411
Revisions in estimated cash flows		26,453			14,353
Obligations settled		(8,617	)		(4,249	)
Balance at end of year	$	116,393		$	89,478