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SEGMENT AND RELATED INFORMATION: - Financial (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
item
segment
country
Dec. 31, 2020
USD ($)
Dec. 31, 2019
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 18) $ 10,934,100 $ 7,984,900 $ 7,285,600
Cost of sales (exclusive of depreciation, amortization and depletion) 3,894,400 3,929,800 3,606,400
Selling, general and administrative 125,200 126,200 131,800
Depreciation, amortization and depletion 806,000 775,600 764,400
Exploration 43,400 32,600 30,000
Operating income 6,065,100 3,120,700 2,753,000
Interest, net (349,900) (347,400) (319,500)
Other income (expense) (18,400) (27,500) (7,000)
Income taxes (2,299,200) (1,174,400) (945,300)
Equity earnings of affiliate, net of income tax 13,600 6,400 10,700
Non-controlling interest (14,100) (7,400) (6,100)
Net income attributable to SCC 3,397,100 1,570,400 1,485,800
Capital investment 892,300 592,200 707,500
Property and mine development, net 9,464,400 9,458,700 9,371,000
Total assets 18,297,600 16,946,500 16,407,400
Intersegment sales      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) (145,900) (111,000) (83,200)
Corporate, other and eliminations      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) (145,900) (111,000) (83,200)
Cost of sales (exclusive of depreciation, amortization and depletion) (162,000) (124,300) (89,100)
Selling, general and administrative 12,300 8,600 6,800
Depreciation, amortization and depletion 37,600 37,700 32,100
Exploration 20,900 12,100 2,700
Operating income (54,700) (45,100) (35,700)
Capital investment 9,500 8,000 6,800
Property and mine development, net 722,900 704,900 346,200
Total assets $ 3,806,900 3,573,300 2,470,000
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 18) $ 6,109,000 4,412,400 3,963,900
Mexican Open-Pit | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) 6,109,000 4,412,400 3,963,900
Cost of sales (exclusive of depreciation, amortization and depletion) 1,953,500 1,991,600 1,613,100
Selling, general and administrative 62,800 70,500 78,600
Depreciation, amortization and depletion 392,600 366,700 351,900
Exploration 2,300 2,500 1,800
Operating income 3,697,800 1,981,100 1,918,500
Capital investment 463,600 317,100 244,300
Property and mine development, net 4,463,200 4,470,500 4,648,500
Total assets 8,559,800 7,236,100 8,081,900
Mexican Open-Pit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) $ 6,109,000 4,412,400 3,963,900
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 18) $ 600,200 529,900 464,800
Mexican IMMSA Unit | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) 600,200 529,900 464,800
Cost of sales (exclusive of depreciation, amortization and depletion) 440,900 383,000 380,300
Selling, general and administrative 10,000 9,500 7,900
Depreciation, amortization and depletion 54,800 42,500 52,300
Exploration 5,700 8,600 9,000
Operating income 88,800 86,300 15,300
Capital investment 98,300 72,100 106,300
Property and mine development, net 571,000 548,200 497,100
Total assets 998,200 967,200 837,600
Mexican IMMSA Unit | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) 454,300 418,900 381,600
Mexican IMMSA Unit | Intersegment sale | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) $ 145,900 111,000 83,200
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 18) $ 4,370,800 3,153,600 2,940,100
Peruvian Operations | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) 4,370,800 3,153,600 2,940,100
Cost of sales (exclusive of depreciation, amortization and depletion) 1,662,000 1,679,500 1,702,100
Selling, general and administrative 40,100 37,600 38,500
Depreciation, amortization and depletion 321,000 328,700 328,100
Exploration 14,500 9,400 16,500
Operating income 2,333,200 1,098,400 854,900
Capital investment 320,900 195,000 350,100
Property and mine development, net 3,707,300 3,735,100 3,879,200
Total assets 4,932,700 5,169,900 5,017,900
Peruvian Operations | Reportable subsegments | Operating segment      
Financial information relating to segments      
Net sales (including sales to related parties, see note 18) $ 4,370,800 $ 3,153,600 $ 2,940,100