Significant Customers (Details)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Significant Customers (Textuals) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	80.00%	84.00%
Approximate percentage of sales of silver concentrates to third-party smelters related to metal sales	20.00%	16.00%