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SEGMENT AND RELATED INFORMATION: - Financial (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
country
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financial information related to segments      
Number of reportable segments | segment 3    
Number of countries having open-pit operations | country 2    
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 7,984,900 $ 7,285,600 $ 7,096,700
Cost of sales (exclusive of depreciation, amortization and depletion) 3,929,800 3,606,400 3,409,000
Selling, general and administrative 126,200 131,800 102,600
Depreciation, amortization and depletion 775,600 764,400 674,300
Exploration 32,600 30,000 29,600
Operating income 3,120,700 2,753,000 2,881,200
Interest, net (347,400) (319,500) (261,100)
Other income (expense) (27,500) (7,000) (30,700)
Income taxes (1,174,400) (945,300) (1,053,500)
Equity earnings of affiliate, net of income tax 6,400 10,700 12,300
Non-controlling interest (7,400) (6,100) (5,200)
Net income attributable to SCC 1,570,400 1,485,800 1,543,000
Capital investment 592,200 707,500 1,121,400
Property and mine development, net 9,458,700 9,371,000 9,403,800
Total assets 16,946,500 16,407,400 14,287,600
Intersegment sales      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) (111,000) (83,200) (79,300)
Corporate, other and eliminations      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) (111,000) (83,200) (79,300)
Cost of sales (exclusive of depreciation, amortization and depletion) (124,300) (89,100) (88,600)
Selling, general and administrative 8,600 6,800 2,100
Depreciation, amortization and depletion 37,700 32,100 28,900
Exploration 12,100 2,700 3,800
Operating income (45,100) (35,700) (25,500)
Capital investment 8,000 6,800 20,600
Property and mine development, net 704,900 346,200 374,500
Total assets $ 3,573,300 2,470,000 379,100
Mexican Open-pit      
Financial information related to segments      
Number of open-pit copper mines | item 2    
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 4,412,400 3,963,900 4,075,900
Mexican Open-pit | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) 4,412,400 3,963,900 4,075,900
Cost of sales (exclusive of depreciation, amortization and depletion) 1,991,600 1,613,100 1,611,000
Selling, general and administrative 70,500 78,600 55,300
Depreciation, amortization and depletion 366,700 351,900 360,400
Exploration 2,500 1,800 2,000
Operating income 1,981,100 1,918,500 2,047,200
Capital investment 317,100 244,300 266,800
Property and mine development, net 4,470,500 4,648,500 4,783,800
Total assets 7,236,100 8,081,900 8,165,200
Mexican Open-pit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 4,412,400 3,963,900 4,075,900
Mexican IMMSA Unit      
Financial information related to segments      
Number of underground poly metal mines | item 5    
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 529,900 464,800 527,900
Mexican IMMSA Unit | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) 529,900 464,800 527,900
Cost of sales (exclusive of depreciation, amortization and depletion) 383,000 380,300 377,200
Selling, general and administrative 9,500 7,900 8,500
Depreciation, amortization and depletion 42,500 52,300 47,600
Exploration 8,600 9,000 5,300
Operating income 86,300 15,300 89,300
Capital investment 72,100 106,300 60,000
Property and mine development, net 548,200 497,100 448,300
Total assets 967,200 837,600 930,200
Mexican IMMSA Unit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) 418,900 381,600 448,600
Mexican IMMSA Unit | Intersegment sales | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 111,000 83,200 79,300
Peruvian Operations      
Financial information related to segments      
Number of open-pit copper mines | item 2    
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 3,153,600 2,940,100 2,572,200
Peruvian Operations | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) 3,153,600 2,940,100 2,572,200
Cost of sales (exclusive of depreciation, amortization and depletion) 1,679,500 1,702,100 1,509,400
Selling, general and administrative 37,600 38,500 36,700
Depreciation, amortization and depletion 328,700 328,100 237,400
Exploration 9,400 16,500 18,500
Operating income 1,098,400 854,900 770,200
Capital investment 195,000 350,100 774,000
Property and mine development, net 3,735,100 3,879,200 3,797,200
Total assets 5,169,900 5,017,900 4,813,100
Peruvian Operations | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 17) $ 3,153,600 $ 2,940,100 $ 2,572,200