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TRADE RECEIVABLES AND REVENUES FROM MINING OPERATIONS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accounts receivable      
Dore bars awaiting settlement   $ 24,281  
Concentrates awaiting settlement 75,899 88,668  
Trade receivables 75,899 112,949  
Product Information      
Revenue from mining operation 1,821,799 1,422,521 613,762
Percentage of revenue from precious metal to total revenue from mining operations 95.00% 93.00% 87.00%
Gold
     
Product Information      
Revenue from mining operation 1,563,760 1,216,249 474,875
Silver
     
Product Information      
Revenue from mining operation 171,725 104,544 59,155
Zinc
     
Product Information      
Revenue from mining operation 70,522 77,544 57,034
Percentage of revenue from byproduct metals to total revenue from mining operations (as a percent) 4.00% 5.00% 9.00%
Copper
     
Product Information      
Revenue from mining operation 14,451 22,219 22,571
Percentage of revenue from byproduct metals to total revenue from mining operations (as a percent) 1.00% 2.00% 4.00%
Lead
     
Product Information      
Revenue from mining operation $ 1,341 $ 1,965 $ 127