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INVENTORIES: (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Metals at lower of average cost or market:      
Finished goods $ 97,600,000   $ 93,300,000
Work-in-process 276,700,000   296,100,000
Supplies at average cost 272,100,000   262,500,000
Total current inventory 646,419,000   651,896,000
Inventory, long-term      
Long-term leach stockpiles 217,943,000   122,985,000
Leaching costs capitalized as long-term inventory of leachable material 157,300,000 87,100,000  
Long-term leaching inventories recognized as cost of sales $ 52,500,000 $ 33,600,000