Significant Customers (Details Textual)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Significant Customers (Textual) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	90.00%	75.00%
Approximate percentage of sales of silver concentrates to third party smelters related to metal sales	10.00%	25.00%