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INVENTORIES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Metals at lower of average cost or market:      
Finished goods $ 84,200,000 $ 101,100,000  
Work-in-process 305,400,000 310,800,000  
Supplies at average cost 304,300,000 284,200,000  
Total current inventory 693,942,000 696,140,000  
Inventory, long-term:      
Long-term leach stockpiles 395,177,000 249,404,000  
Leaching costs capitalized as long-term inventory of leachable material 306,800,000 225,500,000  
Long-term leaching inventories recognized as cost of sales $ 109,300,000 $ 68,500,000 $ 49,200,000