Derivative Losses (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative mark-to-market losses recorded in the Statement of Operations

The derivative mark-to-market losses/(gains) recorded in the Statement of Operations are comprised of the following amounts:

	For the years ended December 31,
	2012		2011			2010
Riverstone Resources, Inc. - warrants	$	162	$	(177	)	$	(216	)
Gold price derivatives	—		19,453			1,066
Derivative loss	$	162	$	19,276		$	850

	For the years ended December 31,
	2012		2011			2010
Realized loss	$	162	$	19,453		$	1,066
Unrealized gain	—		(177		)	(216		)
Derivative loss	$	162	$	19,276		$	850