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SEGMENT AND RELATED INFORMATION: (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
segment
country
Dec. 31, 2011
Dec. 31, 2010
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                 $ 6,669,300,000 $ 6,818,700,000 $ 5,149,500,000
Cost of sales (exclusive of depreciation, amortization and depletion)                 2,769,233,000 2,763,152,000 2,128,999,000
Selling, general and administrative                 101,297,000 104,473,000 100,287,000
Depreciation, amortization and depletion                 325,743,000 288,138,000 281,697,000
Legal fees related to the SCC shareholder derivative lawsuit                 316,233,000    
Exploration                 47,877,000 37,535,000 34,313,000
Operating income 812,600,000 447,800,000 875,600,000 972,900,000 901,900,000 962,100,000 998,700,000 762,700,000 3,108,883,000 3,625,423,000 2,604,204,000
Interest, net                 (157,200,000) (172,800,000) (152,700,000)
Gain (loss) on short term investment                 10,623,000    
Gain on sale of investment                 18,200,000    
Other income (expense)                 (6,990,000) (4,043,000) (20,737,000)
Income taxes                 (1,080,872,000) (1,104,335,000) (868,071,000)
Equity earnings of affiliate                 48,702,000    
Non-controlling interest                 (6,740,000) (7,929,000) (8,658,000)
Net income attributable to SCC 531,800,000 217,900,000 563,500,000 621,400,000 536,900,000 663,100,000 658,000,000 478,400,000 1,934,632,000 2,336,424,000 1,554,051,000
Capital expenditures                 1,051,900,000 612,900,000 408,700,000
Property, net 5,156,731,000       4,429,906,000       5,156,731,000 4,429,906,000 4,095,000,000
Total assets 10,383,749,000       8,062,701,000       10,383,749,000 8,062,701,000 8,128,019,000
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                 3,338,500,000 3,212,100,000 1,618,700,000
Intersegment sales                     29,800,000
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,228,200,000 1,115,800,000 751,700,000
Selling, general and administrative                 34,400,000 34,100,000 31,500,000
Depreciation, amortization and depletion                 145,600,000 133,600,000 122,100,000
Exploration                 5,200,000 3,500,000 5,200,000
Operating income                 1,925,100,000 1,925,100,000 738,000,000
Capital expenditures                 804,400,000 357,600,000 109,800,000
Property, net 2,444,900,000       1,827,200,000       2,444,900,000 1,827,200,000 1,583,500,000
Total assets 4,241,400,000       3,471,600,000       4,241,400,000 3,471,600,000 2,510,400,000
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                 378,500,000 420,100,000 366,700,000
Intersegment sales                 134,100,000 126,100,000 146,000,000
Cost of sales (exclusive of depreciation, amortization and depletion)                 292,400,000 309,300,000 307,400,000
Selling, general and administrative                 14,600,000 14,700,000 13,400,000
Depreciation, amortization and depletion                 25,200,000 24,500,000 22,700,000
Exploration                 28,200,000 22,000,000 15,500,000
Operating income                 152,200,000 175,700,000 153,700,000
Capital expenditures                 56,000,000 48,700,000 29,800,000
Property, net 350,900,000       320,100,000       350,900,000 320,100,000 296,300,000
Total assets 873,100,000       743,400,000       873,100,000 743,400,000 747,700,000
Peruvian Operations
                      
Financial information related to segments                      
Number of open-pit copper mines                 2    
Financial information relating to segments                      
Net sales outside of segments                 2,952,300,000 3,186,500,000 3,125,900,000
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,380,500,000 1,441,000,000 1,206,200,000
Selling, general and administrative                 48,600,000 50,800,000 52,400,000
Depreciation, amortization and depletion                 160,300,000 140,600,000 134,000,000
Exploration                 14,500,000 12,000,000 13,600,000
Operating income                 1,348,400,000 1,542,100,000 1,719,700,000
Capital expenditures                 257,900,000 205,500,000 264,200,000
Property, net 2,231,400,000       2,225,900,000       2,231,400,000 2,225,900,000 2,164,700,000
Total assets 3,353,000,000       3,164,000,000       3,353,000,000 3,164,000,000 3,430,900,000
Corporate and other eliminations
                      
Financial information relating to segments                      
Net sales outside of segments                     38,200,000
Intersegment sales                 (134,100,000) (126,100,000) (175,800,000)
Cost of sales (exclusive of depreciation, amortization and depletion)                 (131,800,000) (102,900,000) (136,300,000)
Selling, general and administrative                 3,700,000 4,900,000 3,000,000
Depreciation, amortization and depletion                 (5,400,000) (10,600,000) 2,900,000
Exploration                 316,200,000    
Operating income                 (316,800,000) (17,500,000) (7,200,000)
Capital expenditures                 (66,500,000) 1,100,000 4,900,000
Property, net 129,500,000       56,700,000       129,500,000 56,700,000 50,500,000
Total assets $ 1,916,200,000       $ 683,700,000       $ 1,916,200,000 $ 683,700,000 $ 1,439,000,000