Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2015

Asset Retirement Obligation Disclosure

Schedule of changes in carrying amount of asset retirement obligations

	2015		2014
Balance at January 1,	$	217,312	$	247,329
Accretion expense		6,890		8,217
Revisions to estimated future reclamation cash flows		(22,410)		(3,409)
Payments		(546)		(561)
Balance at June 30,		201,246		251,576
Less: current portion		(1,071)		(1,118)
Asset retirement obligation, net of current portion	$	200,175	$	250,458