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INVENTORIES : (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Metals at average cost:      
Finished goods $ 81,300   $ 84,600
Work-in-process 416,300   450,500
Supplies at average cost 307,200   301,400
Total current inventory 804,825   836,464
Inventory, long-term:      
Leach stockpiles 726,409   $ 512,718
Leaching costs capitalized as long-term inventory of leachable material 360,000 $ 265,500  
Leachable material inventories recognized in cost of sales $ 172,800 $ 118,800