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INVENTORIES: (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Metals at lower of average cost or market:      
Finished goods $ 110,800,000   $ 93,300,000
Work-in-process 230,500,000   296,100,000
Supplies at average cost 284,300,000   262,500,000
Total current inventory 625,567,000   651,896,000
Inventory, long-term      
Long-term leach stockpiles 182,214,000   122,985,000
Leaching costs capitalized as long-term inventory of leachable material 101,200,000 54,100,000  
Long-term leaching inventories recognized as cost of sales $ 35,300,000 $ 23,600,000