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SEGMENTS AND RELATED INFORMATION: (Details) (USD $)
 3 Months Ended 12 Months Ended
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