Acquisition of ECU Silver Mining Inc. (Details 2) (ECU Silver Mining Inc.)	Sep. 02, 2011 USD ($)	Sep. 02, 2011 CAD	Sep. 02, 2011 Replacement Warrant USD ($)	Sep. 02, 2011 Replacement Option USD ($)
Calculation of purchase price
Cash consideration	$ 129,000	126,112
Equity interest issued or issuable	223,097,000		8,744,000	1,109,000
Total purchase price	$ 233,079,000
Value of common stock (in dollars per share)	$ 13.94