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SEGMENTS AND RELATED INFORMATION: (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 segment country | Dec. 31, 2010 | Dec. 31, 2009
SEGMENT AND RELATED INFORMATION: |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  | 3 |  |
Financial information related to segments |  |  |  |  |  |  |  |  |  |  |
Number of countries having open-pit operations |  |  |  |  |  |  |  |  | 2 |  |
Financial information relating to segments |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | $ 6,818,700,000 | $ 5,149,500,000 | $ 3,734,300,000
Cost of sales (exclusive of depreciation, amortization and depletion) |  |  |  |  |  |  |  |  | 2,763,152,000 | 2,128,999,000 | 1,865,828,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 104,473,000 | 100,287,000 | 85,168,000
Depreciation, amortization and depletion |  |  |  |  |  |  |  |  | 288,138,000 | 281,697,000 | 273,558,000
Exploration |  |  |  |  |  |  |  |  | 37,535,000 | 34,313,000 | 24,578,000
Operating income | 901,900,000 | 962,100,000 | 998,700,000 | 762,700,000 | 852,100,000 | 602,900,000 | 540,400,000 | 608,800,000 | 3,625,423,000 | 2,604,204,000 | 1,485,148,000
Interest, net |  |  |  |  |  |  |  |  | (172,800,000) | (152,700,000) | (90,900,000)
Loss on derivative instruments |  |  |  |  |  |  |  |  |  |  | 4,236,000
Other (expense) income |  |  |  |  |  |  |  |  | (4,043,000) | (20,737,000) | 6,077,000
Income taxes |  |  |  |  |  |  |  |  | (1,104,335,000) | (868,071,000) | (469,861,000)
Net income | 539,000,000 | 665,100,000 | 660,100,000 | 480,100,000 | 495,000,000 | 367,200,000 | 315,300,000 | 385,200,000 | 2,344,353,000 | 1,562,709,000 | 934,573,000
Less: Net income attributable to the non-controlling interest |  |  |  |  |  |  |  |  | (7,929,000) | (8,658,000) | (5,192,000)
Net income attributable to SCC | 536,900,000 | 663,100,000 | 658,000,000 | 478,400,000 | 492,200,000 | 365,200,000 | 313,400,000 | 383,200,000 | 2,336,424,000 | 1,554,051,000 | 929,381,000
Capital expenditures |  |  |  |  |  |  |  |  | 612,900,000 | 408,700,000 | 414,800,000
Property, net | 4,419,885,000 |  |  |  | 4,094,993,000 |  |  |  | 4,419,885,000 | 4,094,993,000 | 3,969,600,000
Total assets | 8,062,701,000 |  |  |  | 8,128,019,000 |  |  |  | 8,062,701,000 | 8,128,019,000 | 6,058,200,000
Mexican Open-pit |  |  |  |  |  |  |  |  |  |  |
Financial information related to segments |  |  |  |  |  |  |  |  |  |  |
Number of open-pit copper mines |  |  |  |  |  |  |  |  | 2 |  |
Financial information relating to segments |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,212,100,000 | 1,618,700,000 | 1,037,000,000
Intersegment sales |  |  |  |  |  |  |  |  |  | 29,800,000 | 39,700,000
Cost of sales (exclusive of depreciation, amortization and depletion) |  |  |  |  |  |  |  |  | 1,115,800,000 | 751,700,000 | 594,700,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 34,100,000 | 31,500,000 | 28,400,000
Depreciation, amortization and depletion |  |  |  |  |  |  |  |  | 133,600,000 | 122,100,000 | 120,500,000
Exploration |  |  |  |  |  |  |  |  | 3,500,000 | 5,200,000 | 2,100,000
Operating income |  |  |  |  |  |  |  |  | 1,925,100,000 | 738,000,000 | 331,000,000
Capital expenditures |  |  |  |  |  |  |  |  | 358,300,000 | 109,800,000 | 79,400,000
Property, net | 1,817,200,000 |  |  |  | 1,583,500,000 |  |  |  | 1,817,200,000 | 1,583,500,000 | 1,615,800,000
Total assets | 3,471,600,000 |  |  |  | 2,510,400,000 |  |  |  | 3,471,600,000 | 2,510,400,000 | 2,346,500,000
Mexican IMMSA Unit |  |  |  |  |  |  |  |  |  |  |
Financial information related to segments |  |  |  |  |  |  |  |  |  |  |
Number of underground poly metal mines |  |  |  |  |  |  |  |  | 5 |  |
Financial information relating to segments |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 420,100,000 | 366,700,000 | 420,200,000
Intersegment sales |  |  |  |  |  |  |  |  | 126,100,000 | 146,000,000 | 140,000,000
Cost of sales (exclusive of depreciation, amortization and depletion) |  |  |  |  |  |  |  |  | 309,300,000 | 307,400,000 | 378,700,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 14,700,000 | 13,400,000 | 12,300,000
Depreciation, amortization and depletion |  |  |  |  |  |  |  |  | 24,500,000 | 22,700,000 | 24,400,000
Exploration |  |  |  |  |  |  |  |  | 22,000,000 | 15,500,000 | 7,900,000
Operating income |  |  |  |  |  |  |  |  | 175,700,000 | 153,700,000 | 136,900,000
Capital expenditures |  |  |  |  |  |  |  |  | 48,900,000 | 29,800,000 | 27,800,000
Property, net | 320,100,000 |  |  |  | 296,300,000 |  |  |  | 320,100,000 | 296,300,000 | 278,400,000
Total assets | 743,400,000 |  |  |  | 747,700,000 |  |  |  | 743,400,000 | 747,700,000 | 664,600,000
Peruvian Operations |  |  |  |  |  |  |  |  |  |  |
Financial information related to segments |  |  |  |  |  |  |  |  |  |  |
Number of open-pit copper mines |  |  |  |  |  |  |  |  | 2 |  |
Financial information relating to segments |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,186,500,000 | 3,125,900,000 | 2,223,500,000
Cost of sales (exclusive of depreciation, amortization and depletion) |  |  |  |  |  |  |  |  | 1,441,000,000 | 1,206,200,000 | 1,019,700,000
Selling, general and administrative |  |  |  |  |  |  |  |  | 50,800,000 | 52,400,000 | 44,400,000
Depreciation, amortization and depletion |  |  |  |  |  |  |  |  | 140,600,000 | 134,000,000 | 127,500,000
Exploration |  |  |  |  |  |  |  |  | 12,000,000 | 13,600,000 | 14,600,000
Operating income |  |  |  |  |  |  |  |  | 1,542,100,000 | 1,719,700,000 | 1,017,300,000
Capital expenditures |  |  |  |  |  |  |  |  | 205,700,000 | 264,200,000 | 284,400,000
Property, net | 2,225,900,000 |  |  |  | 2,164,700,000 |  |  |  | 2,225,900,000 | 2,164,700,000 | 2,026,300,000
Total assets | 3,164,000,000 |  |  |  | 3,430,900,000 |  |  |  | 3,164,000,000 | 3,430,900,000 | 2,896,900,000
Corporate and other eliminations |  |  |  |  |  |  |  |  |  |  |
Financial information relating to segments |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  |  | 38,200,000 | 53,600,000
Intersegment sales |  |  |  |  |  |  |  |  | (126,100,000) | (175,800,000) | (179,700,000)
Cost of sales (exclusive of depreciation, amortization and depletion) |  |  |  |  |  |  |  |  | (102,900,000) | (136,300,000) | (127,300,000)
Selling, general and administrative |  |  |  |  |  |  |  |  | 4,900,000 | 3,000,000 | 100,000
Depreciation, amortization and depletion |  |  |  |  |  |  |  |  | (10,600,000) | 2,900,000 | 1,200,000
Operating income |  |  |  |  |  |  |  |  | (17,500,000) | (7,200,000) | (100,000)
Capital expenditures |  |  |  |  |  |  |  |  |  | 4,900,000 | 23,200,000
Property, net | 56,700,000 |  |  |  | 50,500,000 |  |  |  | 56,700,000 | 50,500,000 | 49,100,000
Total assets | $ 683,700,000 |  |  |  | $ 1,439,000,000 |  |  |  | $ 683,700,000 | $ 1,439,000,000 | $ 150,200,000

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- Definition Current year acquisitions of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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- Definition Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Amount of revenue from transactions with other operating segments of the same entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Paragraph 5A -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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