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Metal and Other Inventories
3 Months Ended
Mar. 31, 2012
Inventory Disclosure [Abstract]  
METAL AND OTHER INVENTORIES
METAL AND OTHER INVENTORY
Metal and other inventory consist of the following (in thousands): 
 
March 31, 2012
 
December 31,
2011
Concentrate and doré inventory
$
86,613

 
$
73,590

Supplies
64,436

 
59,191

Metal and other inventory
$
151,049

 
$
132,781