Litigation and Other Events (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Oct. 14, 2009 m	Dec. 05, 2011 Rochester [Member] claim acre
Litigation and Other Events (Additional) (Textual)
Number of Unpatented Mining Claims			447
Approximate Area of Federal Lands Covering for Unpatented Mining Claims			8,600
Litigation and Other Events (Textual) [Abstract]
Settlement Amount Under Law	$ 0
Maximum height for temporary restriction on mining		4,400