Discontinued Operations (Details Textual) (USD $)	12 Months Ended			8 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2010 Cerro Bayo Mine [Member] oz	Dec. 31, 2010 Cerro Bayo Mine [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations (Textual) [Abstract]
Percentage of ownership in the companies				100.00%
Cash to be received as per sale agreement				$ 0
Shares received from Divesture of business				17,857,143
Six Equal quarterly installment of Silver in ounce received from Divesture of business				125,000
Fair value of silver to be delivered				0
Net Smelter Royalty on production from Minera Cerro Bayo				2.00%
Maximum Cumulative ounce of gold for smelter royalty calculation				50,000
Silver in ounce for smelter royalty				5,000,000
Fair Value of silver for Smelter Royalty				0
Retained value added taxes				0
Amount of next reclamation costs associated with Mineral Cerro Bayo's nearby Furioso property to be paid by Mandalay				0
Gain (loss) on sale of net assets of discontinued operations, net of taxes of $0.0 million for 2010 and $6.5 million for 2009	$ 0	$ 0	$ (2,095,000)	$ 0	$ (2,095,000)