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INVENTORIES: (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Metals at lower of average cost or market:      
Finished goods $ 98,300,000   $ 84,200,000
Work-in-process 346,900,000   305,400,000
Supplies at average cost 309,400,000   304,300,000
Total current inventory 754,626,000   693,942,000
Inventory, long-term:      
Leach stockpiles 495,238,000   395,177,000
Leaching costs capitalized as long-term inventory of leachable material 181,200,000 142,500,000  
Leachable material inventories recognized in cost of sales $ 79,500,000 $ 54,600,000