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INVENTORIES: (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Metals at lower of average cost or market:        
Finished goods $ 84,600,000us-gaap_InventoryFinishedGoodsNetOfReserves $ 84,600,000us-gaap_InventoryFinishedGoodsNetOfReserves $ 84,200,000us-gaap_InventoryFinishedGoodsNetOfReserves  
Work-in-process 450,500,000us-gaap_InventoryWorkInProcessNetOfReserves 450,500,000us-gaap_InventoryWorkInProcessNetOfReserves 305,400,000us-gaap_InventoryWorkInProcessNetOfReserves  
Supplies at average cost 301,400,000us-gaap_InventorySuppliesNetOfReserves 301,400,000us-gaap_InventorySuppliesNetOfReserves 304,300,000us-gaap_InventorySuppliesNetOfReserves  
Total current inventory 836,464,000us-gaap_InventoryNet 836,464,000us-gaap_InventoryNet 693,942,000us-gaap_InventoryNet  
Inventory, long-term:        
Leach stockpiles 512,718,000us-gaap_InventoryOreStockpilesOnLeachPads 512,718,000us-gaap_InventoryOreStockpilesOnLeachPads 395,177,000us-gaap_InventoryOreStockpilesOnLeachPads  
Leaching costs capitalized as long-term inventory of leachable material   401,300,000scco_InventoryOreStockpilesOnLeachPadsCapitalizedCosts 306,800,000scco_InventoryOreStockpilesOnLeachPadsCapitalizedCosts 225,500,000scco_InventoryOreStockpilesOnLeachPadsCapitalizedCosts
Leachable material inventories recognized in cost of sales $ 17,000,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales $ 177,500,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales $ 109,300,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales $ 68,500,000scco_InventoryOreStockpilesOnLeachPadsRecognizedAsCostOfSales