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INVENTORIES : (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Metals at average cost:      
Finished goods $ 101,700   $ 84,600
Work-in-process 427,200   450,500
Supplies at average cost 297,600   301,400
Total current inventory 826,468   836,464
Inventory, long-term:      
Leach stockpiles 630,674   $ 512,718
Leaching costs capitalized as long-term inventory of leachable material 232,400 $ 181,200  
Leachable material inventories recognized in cost of sales $ 114,000 $ 79,500