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Note 8. Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Dividend Payment Restrictions [Table Text Block]
Quarterly average realized silver price per ounce
 
Quarterly dividend per share
 
Annualized dividend per share
$30
 
$0.01
 
$0.04
$35
 
$0.02
 
$0.08
$40
 
$0.03
 
$0.12
$45
 
$0.04
 
$0.16
$50
 
$0.05
 
$0.20
$55
 
$0.06
 
$0.24
$60
 
$0.07
 
$0.28
Schedule of Dividends Payable [Table Text Block]
Declaration date
 
(A)
Silver-price-
linked
component
 per share
 
(B)
Minimum
annual
 component
per share
 
(A+B)
 
Total
dividend
 per share
 
Total dividend
 amount (in
millions)
 
Month of payment
February 17, 2012
 
$0.01
 
$0.0025
 
$0.0125
 
$3.6
 
March 2012
May 8, 2012
 
$0.02
 
$0.0025
 
$0.0225
 
$6.4
 
June 2012
August 7, 2012
 
$—
 
$0.0025
 
$0.0025
 
$0.7
 
September 2012
November 2, 2012
 
$0.02
 
$0.0025
 
$0.0225
 
$6.4
 
anticipated in December 2012
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Warrants Outstanding
 
Warrants
 
Exercise Price
 
Expiration Date
Series 1 warrants
 
5,200,519
 
$
2.42
 
June 2014
Series 1 warrants
 
460,976
 
2.53
 
June 2014
Series 3 warrants
 
16,671,128
 
2.47
 
August 2014
Total warrants outstanding
 
22,332,623