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Significant Customers Significant Customers (Tables)
 9 Months Ended
Sep. 30, 2012
Significant Customers [Abstract]  
Schedule of Significant Customers
The following table indicates customers that represent 10% or more of total sales of metal for the three months ended September 30, 2012 and 2011 (in millions):
Customer
 
Three months ended
September 30,
 
Three months ended
September 30,
 
Segments reporting sales of metal
 
 
2012
 
2011
 
 
Valcambi
 
$
112.7

 
$
112.4

 
Palmarejo, San Bartolomé
Auramet
 
$
32.0

 
$
—

 
San Bartolomé, Kensington
Mitsui
 
$
14.2

 
$
49.9

 
Palmarejo, San Bartolomé, Rochester
International Commodities
 
$
10.8

 
$
47.0

 
Palmarejo, San Bartolomé, Rochester
Standard
 
$
17.5

 
$
36.0

 
Palmarejo
The following table indicates customers that represent 10% or more of total sales of metal for the nine months ended September 30, 2012 and 2011 (in millions):
Customer
 
Nine months ended
September 30,
 
Nine months ended
September 30,
 
Segments reporting sales of metal
 
 
2012
 
2011
 
 
Valcambi
 
$
368.9

 
$
255.3

 
Palmarejo, San Bartolomé
Standard
 
$
42.0

 
$
86.4

 
Palmarejo
Mitsui
 
$
40.1

 
$
81.9

 
Palmarejo, San Bartolomé, Rochester
China National Gold
 
$
25.7

 
$
94.4

 
Kensington
International Commodities
 
$
34.7

 
$
93.3

 
Palmarejo, San Bartolomé, Rochester