Significant Customers (Details Textual)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Significant Customers (Textual) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	70.00%	90.00%
Approximate percentage of sales of silver concentrates to third party smelters related to metal sales	30.00%	10.00%