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INVENTORIES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Metals at lower of average cost or market:      
Finished goods $ 101,100,000 $ 93,300,000  
Work-in-process 297,400,000 290,300,000  
Supplies at average cost 284,200,000 252,400,000  
Total current inventory 682,749,000 636,032,000  
Inventory, long-term      
Long-term leach stockpiles 262,795,000 128,828,000  
Leaching costs capitalized as long-term inventory of leachable material 225,500,000 168,000,000  
Long-term leaching inventories recognized as cost of sales $ 68,500,000 $ 49,200,000 $ 41,500,000