Mining Properties (Details Textual) (USD $) In Thousands, unless otherwise specified	1 Months Ended	4 Months Ended	12 Months Ended			1 Months Ended
	Mar. 31, 2006 oz	Dec. 31, 2008 oz	Dec. 31, 2012	Dec. 31, 2011 mi	Dec. 31, 2010	Apr. 30, 2002 Martha [Member]	May 23, 2005 Endeavor [Member] oz
Property, Plant and Equipment (Textual) [Abstract]
Acquisition of interest in mine						100.00%
Impairment of Long-Lived Assets Held-for-use			$ 5,825	$ 0	$ 0
Quantity of acquired silver production and reserves							17,700,000
Mining Properties (Textual) [Abstract]
Distance of Lynn Canal from mines				45
Silver production and reserves payable ounces	20,000,000
Cumulative ounces of silver received by CDE Australia		4,200,000
Current ore reserve payable ounces based on current metallurgical recovery and current smelter contract terms		4,500,000