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STOCKHOLDERS' EQUITY: (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 87 Months Ended
Feb. 28, 2015
Jan. 31, 2015
Mar. 21, 2014
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2008
Mar. 31, 2015
SCC share repurchase program:                
Amount authorized for share repurchase program       $ 3,000us-gaap_StockRepurchaseProgramAuthorizedAmount1     $ 500us-gaap_StockRepurchaseProgramAuthorizedAmount1 $ 3,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Total Number of Shares Purchased 2,590,076us-gaap_TreasuryStockSharesAcquired 5,927,154us-gaap_TreasuryStockSharesAcquired 4,563,649us-gaap_TreasuryStockSharesAcquired 13,080,879us-gaap_TreasuryStockSharesAcquired 22,711,428us-gaap_TreasuryStockSharesAcquired 10,245,000us-gaap_TreasuryStockSharesAcquired 46,914,486us-gaap_TreasuryStockSharesAcquired 92,951,793us-gaap_TreasuryStockSharesAcquired
Average Price Paid per Share (in dollars per share) $ 29.45us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 27.12us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 29.16us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 29.29us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 30.06us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 27.47us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 18.72us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 23.80us-gaap_TreasuryStockAcquiredAverageCostPerShare
Total Number of Shares Purchased as Part of Publicly Announced Plan 88,388,144scco_TreasuryStockSharesAcquiredCumulative 85,798,068scco_TreasuryStockSharesAcquiredCumulative   92,951,793scco_TreasuryStockSharesAcquiredCumulative 79,870,914scco_TreasuryStockSharesAcquiredCumulative 57,159,486scco_TreasuryStockSharesAcquiredCumulative 46,914,486scco_TreasuryStockSharesAcquiredCumulative 92,951,793scco_TreasuryStockSharesAcquiredCumulative
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $29.18       26,992,079us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased       26,992,079us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Total Cost $ 76.3us-gaap_TreasuryStockValueAcquiredCostMethod $ 160.7us-gaap_TreasuryStockValueAcquiredCostMethod $ 133.1us-gaap_TreasuryStockValueAcquiredCostMethod $ 370.1us-gaap_TreasuryStockValueAcquiredCostMethod $ 682.8us-gaap_TreasuryStockValueAcquiredCostMethod $ 281.4us-gaap_TreasuryStockValueAcquiredCostMethod $ 878.1us-gaap_TreasuryStockValueAcquiredCostMethod $ 2,212.4us-gaap_TreasuryStockValueAcquiredCostMethod
Percentage of ownership interest held by the parent company       86.00%scco_PercentageOfOwnershipByParent       86.00%scco_PercentageOfOwnershipByParent