Assets Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Summary of Asset Retirement Obligation

The following table summarizes the changes in the reserve for future restoration and reclamation costs on the balance sheet:

	March 31, 2015			December 31, 2014
Balance, beginning of period	$	4,196		$	3,834
Changes in cash flow estimates		-			136
Costs incurred		(48	)		(199	)
Accretion expense		112			425
Balance, end of period		4,260			4,196
Less: Current portion		(197	)		(196	)
Non-current Portion	$	4,063		$	4,000