Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 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
Reduction in asset retirement obligation attributable to sale of
Decker Mine interest		—		(72,175)
Accretion expense		9,960		12,066
Revisions to estimated future reclamation cash flows		(57,631)		(9,852)
Payments		(780)		(788)
Balance at September 30,		168,861		176,580
Less: current portion		(1,071)		(1,118)
Asset retirement obligation, net of current portion	$	167,790	$	175,462