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INVENTORIES: (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Metals at lower of average cost or market:      
Finished goods $ 89,100,000us-gaap_InventoryFinishedGoodsNetOfReserves   $ 84,600,000us-gaap_InventoryFinishedGoodsNetOfReserves
Work-in-process 440,800,000us-gaap_InventoryWorkInProcessNetOfReserves   450,500,000us-gaap_InventoryWorkInProcessNetOfReserves
Supplies at average cost 313,000,000us-gaap_InventorySuppliesNetOfReserves   301,400,000us-gaap_InventorySuppliesNetOfReserves
Total current inventory 842,925,000us-gaap_InventoryNet   836,464,000us-gaap_InventoryNet
Inventory, long-term:      
Leach stockpiles 560,956,000us-gaap_InventoryOreStockpilesOnLeachPads   512,718,000us-gaap_InventoryOreStockpilesOnLeachPads
Leaching costs capitalized as long-term inventory of leachable material 104,600,000scco_InventoryOreStockpilesOnLeachPadsCapitalizedCosts 86,100,000scco_InventoryOreStockpilesOnLeachPadsCapitalizedCosts  
Leachable material inventories recognized in cost of sales $ 50,600,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales $ 39,200,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales