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SEGMENTS AND RELATED INFORMATION: (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
segment
Year
unit
Sep. 30, 2010
Dec. 31, 2010
SEGMENT AND RELATED INFORMATION:     
Number of reportable segments  3  
Financial information relating to segments     
Net sales outside of segments$ 1,745,906,000$ 1,257,864,000$ 5,149,423,000$ 3,650,509,000 
Cost of sales (exclusive of depreciation, amortization and depletion)677,258,000550,803,0002,110,095,0001,589,458,000 
Selling, general and administrative24,376,00023,148,00074,692,00070,642,000 
Depreciation, amortization and depletion72,506,00072,144,000216,048,000210,916,000 
Exploration9,675,0008,871,00025,040,00027,401,000 
Operating income962,091,000602,898,0002,723,548,0001,752,092,000 
Less:     
Interest, net(43,100,000)(47,800,000)(130,500,000)(113,300,000) 
Other income (expense)(1,374,000)(9,180,000)4,774,000(14,236,000) 
Income taxes(252,507,000)(178,717,000)(792,523,000)(556,859,000) 
Non-controlling interest(2,021,000)(2,029,000)(5,874,000)(5,936,000) 
Net income attributable to SCC663,039,000365,171,0001,799,452,0001,061,802,000 
Capital expenditure153,400,000112,900,000337,000,000281,200,000 
Property, net4,210,124,0004,042,600,0004,210,124,0004,042,600,0004,094,993,000
Total assets7,999,580,0007,611,400,0007,999,580,0007,611,400,0008,128,019,000
Mexicon Open Pit
     
Financial information relating to segments     
Net sales outside of segments858,500,000430,500,0002,429,100,0001,146,200,000 
Intersegment sales   29,100,000 
Cost of sales (exclusive of depreciation, amortization and depletion)307,500,000214,800,000835,100,000579,100,000 
Selling, general and administrative8,300,0007,600,00025,100,00022,800,000 
Depreciation, amortization and depletion37,700,00030,500,000101,200,00090,500,000 
Exploration900,0001,500,0002,300,0003,800,000 
Operating income504,100,000176,100,0001,465,400,000479,100,000 
Less:     
Capital expenditure112,000,00026,900,000218,300,00049,800,000 
Property, net1,702,000,0001,565,300,0001,702,000,0001,565,300,000 
Total assets3,125,500,0002,351,600,0003,125,500,0002,351,600,000 
Mexican IMMSA Unit
     
Financial information relating to segments     
Net sales outside of segments107,900,00077,700,000327,000,000256,400,000 
Intersegment sales31,900,00022,700,00098,800,000110,200,000 
Cost of sales (exclusive of depreciation, amortization and depletion)87,300,00064,000,000230,900,000234,100,000 
Selling, general and administrative3,600,0003,200,00010,800,0009,800,000 
Depreciation, amortization and depletion6,300,0005,600,00018,500,00016,900,000 
Exploration5,500,0003,800,00014,100,00010,900,000 
Operating income37,100,00023,800,000151,500,00094,900,000 
Less:     
Capital expenditure9,800,00012,900,00026,100,00023,100,000 
Property, net309,900,000280,000,000309,900,000280,000,000 
Total assets746,900,000647,300,000746,900,000647,300,000 
Peruvian Operations
     
Financial information relating to segments     
Net sales outside of segments779,500,000749,700,0002,393,300,0002,209,700,000 
Cost of sales (exclusive of depreciation, amortization and depletion)334,400,000293,400,0001,134,700,000876,000,000 
Selling, general and administrative11,600,00011,700,00035,700,00035,400,000 
Depreciation, amortization and depletion35,000,00034,400,000104,000,00099,900,000 
Exploration3,300,0003,600,0008,600,00012,700,000 
Operating income395,200,000406,600,0001,110,300,0001,185,700,000 
Less:     
Capital expenditure30,500,00066,600,00090,500,000201,100,000 
Property, net2,145,900,0002,140,500,0002,145,900,0002,140,500,000 
Total assets2,970,200,0003,013,900,0002,970,200,0003,013,900,000 
Corporate, other and eliminations
     
Financial information relating to segments     
Net sales outside of segments   38,200,000 
Intersegment sales(31,900,000)(22,700,000)(98,800,000)(139,300,000) 
Cost of sales (exclusive of depreciation, amortization and depletion)(51,900,000)(21,400,000)(90,600,000)(99,700,000) 
Selling, general and administrative900,000700,0003,100,0002,600,000 
Depreciation, amortization and depletion(6,500,000)1,600,000(7,700,000)3,600,000 
Operating income25,600,000(3,600,000)(3,600,000)(7,600,000) 
Less:     
Capital expenditure1,100,0006,500,0002,100,0007,200,000 
Property, net52,300,00056,800,00052,300,00056,800,000 
Total assets$ 1,157,000,000$ 1,598,600,000$ 1,157,000,000$ 1,598,600,000