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INVENTORIES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Metals at lower of average cost or market:    
Finished goods $ 93,300,000 $ 67,900,000
Work-in-process 296,100,000 227,600,000
Supplies at average cost 262,500,000 245,500,000
Total current inventory 651,896,000 540,988,000
Inventory, long-term    
Leachable material, net 122,985,000 29,668,000
Leaching costs capitalized as long-term inventory of leachable material 168,000,000  
Long-term leaching inventories recognized as cost of sales $ 49,200,000 $ 41,500,000