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Metal and Other Inventories
6 Months Ended
Jun. 30, 2012
Inventory Disclosure [Abstract]  
METAL AND OTHER INVENTORIES
METAL AND OTHER INVENTORY
Metal and other inventory consist of the following (in thousands): 
 
June 30, 2012
 
December 31,
2011
Concentrate and doré inventory
$
76,549

 
$
73,590

Supplies
68,595

 
59,191

Metal and other inventory
$
145,144

 
$
132,781