Significant Customers (Details Textual)	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Significant Customers (Textual) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	92.00%	81.00%
Approximate percentage of sales of silver concentrates to third party smelters related to metal sales	8.00%	19.00%