Significant Customers (Details Textual)	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2012
Significant Customers (Textual) [Abstract]
Approximate percentage of sales of metals to counterparties companies related to metal sales	74.00%	92.00%
Approximate percentage of sales of silver concentrates to third party smelters related to metal sales	26.00%	8.00%