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INTANGIBLE ASSETS: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | $ 141,000,000 us-gaap_FiniteLivedIntangibleAssetsGross | $ 139,400,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated amortization | (48,100,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (46,200,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Goodwill | 17,000,000 us-gaap_Goodwill | 17,000,000 us-gaap_Goodwill |
Intangible Assets, Net (Including Goodwill), Total | 109,872,000 us-gaap_IntangibleAssetsNetIncludingGoodwill | 110,219,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |
Amortization expense: |  |  |
Amortization expense | 1,900,000 us-gaap_AmortizationOfIntangibleAssets | 2,400,000 us-gaap_AmortizationOfIntangibleAssets | 2,200,000 us-gaap_AmortizationOfIntangibleAssets
Estimated amortization expense: |  |  |
2015-2019 | 7,600,000 scco_FiniteLivedIntangibleAssetsFutureAmortizationExpenseFiveYears |  |
Average annual | 1,500,000 scco_FiniteLivedIntangibleAssetsAverageAnnualFutureAmortizationExpense |  |
Mining concessions |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 121,200,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember | 121,200,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Accumulated amortization | (33,900,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember | (33,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UseRightsMember |
Mine engineering and development studies |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 6,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = scco_MiningEngineeringAndDevelopmentStudiesMember | 6,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = scco_MiningEngineeringAndDevelopmentStudiesMember |
Accumulated amortization | (5,200,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = scco_MiningEngineeringAndDevelopmentStudiesMember | (4,900,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = scco_MiningEngineeringAndDevelopmentStudiesMember |
Software |  |  |
Intangible assets |  |  |
Intangible assets excluding goodwill, gross | 13,800,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 12,200,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Accumulated amortization | $ (9,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | $ (8,300,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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