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SEGMENT AND RELATED INFORMATION: (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Dec. 31, 2012
SEGMENT AND RELATED INFORMATION:      
Number of reportable segments 3    
Financial information relating to segments      
Net sales outside of segments $ 1,623,000,000 $ 1,805,900,000  
Cost of sales (exclusive of depreciation, amortization and depletion) 726,682,000 721,927,000  
Selling, general and administrative 25,374,000 25,431,000  
Depreciation, amortization and depletion 90,572,000 76,944,000  
Exploration 10,324,000 8,725,000  
Operating income 770,050,000 972,909,000  
Interest, net (47,100,000) (40,500,000)  
Other income (expense) 848,000 7,235,000  
Income taxes (234,946,000) (318,769,000)  
Equity earnings of affiliate 8,163,000 2,654,000  
Non-controlling interest (1,641,000) (2,132,000)  
Net income attributable to SCC 495,392,000 621,430,000  
Capital expenditures 316,800,000 177,400,000  
Property, net 5,349,196,000 4,495,900,000 5,156,731,000
Total assets 10,776,869,000 8,493,900,000 10,383,749,000
Mexican Open-pit
      
Financial information relating to segments      
Net sales outside of segments 862,600,000 878,800,000  
Cost of sales (exclusive of depreciation, amortization and depletion) 380,700,000 319,600,000  
Selling, general and administrative 8,800,000 8,700,000  
Depreciation, amortization and depletion 40,200,000 33,600,000  
Exploration 900,000 700,000  
Operating income 432,000,000 516,200,000  
Capital expenditures 250,600,000 135,100,000  
Property, net 2,694,000,000 1,913,700,000  
Total assets 4,647,700,000 3,849,700,000  
Mexican IMMSA Unit
      
Financial information relating to segments      
Net sales outside of segments 89,900,000 100,600,000  
Intersegment sales 32,000,000 37,900,000  
Cost of sales (exclusive of depreciation, amortization and depletion) 73,100,000 75,500,000  
Selling, general and administrative 3,800,000 3,600,000  
Depreciation, amortization and depletion 6,700,000 6,300,000  
Exploration 6,100,000 6,200,000  
Operating income 32,200,000 46,900,000  
Capital expenditures 17,900,000 14,400,000  
Property, net 359,700,000 327,700,000  
Total assets 892,700,000 764,500,000  
Peruvian Operations
      
Financial information relating to segments      
Net sales outside of segments 670,500,000 826,500,000  
Cost of sales (exclusive of depreciation, amortization and depletion) 316,900,000 359,200,000  
Selling, general and administrative 12,100,000 12,500,000  
Depreciation, amortization and depletion 41,400,000 39,000,000  
Exploration 3,300,000 1,800,000  
Operating income 296,800,000 414,000,000  
Capital expenditures 39,300,000 27,900,000  
Property, net 2,213,900,000 2,204,000,000  
Total assets 3,425,100,000 3,170,500,000  
Corporate and other eliminations
      
Financial information relating to segments      
Intersegment sales (32,000,000) (37,900,000)  
Cost of sales (exclusive of depreciation, amortization and depletion) (44,000,000) (32,400,000)  
Selling, general and administrative 700,000 600,000  
Depreciation, amortization and depletion 2,300,000 (2,000,000)  
Operating income 9,000,000 (4,100,000)  
Capital expenditures 9,000,000    
Property, net 81,600,000 50,500,000  
Total assets $ 1,811,400,000 $ 709,200,000