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SEGMENT AND RELATED INFORMATION: - Financial (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
country
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
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) $ 1,854,700 $ 1,859,500 $ 1,818,000 $ 1,753,400 $ 1,694,700 $ 1,723,700 $ 1,837,200 $ 1,841,100 $ 7,285,600 $ 7,096,700 $ 6,654,500
Cost of sales (exclusive of depreciation, amortization and depletion)                 3,606,400 3,409,000 3,252,800
Selling, general and administrative                 131,800 102,600 93,100
Depreciation, amortization and depletion                 764,400 674,300 671,100
Exploration                 30,000 29,600 28,800
Environmental remediation                     (10,200)
Operating income 631,900 713,800 713,600 693,700 623,600 696,700 787,600 773,300 2,753,000 2,881,200 2,618,900
Interest, net                 (319,500) (261,100) (300,500)
Other income (expense)                 (7,000) (30,700) (15,700)
Income taxes                 (945,300) (1,053,500) (1,593,400)
Equity earnings (loss) of affiliate, net of income tax                 10,700 12,300 23,100
Non-controlling interest                 (6,100) (5,200) (3,900)
Net income attributable to SCC 305,600 $ 389,600 $ 402,400 $ 388,200 293,300 $ 369,400 $ 409,600 $ 470,700 1,485,800 1,543,000 728,500
Capital investment                 707,500 1,121,400 1,023,500
Property and mine development, net 9,371,000       9,403,800       9,371,000 9,403,800 9,099,600
Total assets 16,407,400       14,287,600       16,407,400 14,287,600 13,780,100
Intersegment sales                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 (83,200) (79,300) (71,000)
Corporate, other and eliminations                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 (83,200) (79,300) (71,800)
Cost of sales (exclusive of depreciation, amortization and depletion)                 (89,100) (88,600) (69,600)
Selling, general and administrative                 6,800 2,100 1,100
Depreciation, amortization and depletion                 32,100 28,900 10,300
Exploration                 2,700 3,800 6,200
Operating income                 (35,700) (25,500) (19,000)
Capital investment                 6,800 20,600 4,000
Property and mine development, net 346,200       374,500       346,200 374,500 338,400
Total assets 2,470,000       379,100       $ 2,470,000 379,100 253,400
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)                 $ 3,963,900 4,075,900 3,972,700
Mexican Open-pit | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 3,963,900 4,075,900 3,972,700
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,613,100 1,611,000 1,594,300
Selling, general and administrative                 78,600 55,300 47,900
Depreciation, amortization and depletion                 351,900 360,400 401,000
Exploration                 1,800 2,000 2,700
Environmental remediation                     (10,200)
Operating income                 1,918,500 2,047,200 1,937,000
Capital investment                 244,300 266,800 297,600
Property and mine development, net 4,648,500       4,783,800       4,648,500 4,783,800 5,004,500
Total assets 8,081,900       8,165,200       8,081,900 8,165,200 8,323,100
Mexican Open-pit | Reportable subsegments | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 $ 3,963,900 4,075,900 3,972,700
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)                 $ 464,800 527,900 509,500
Mexican IMMSA Unit | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 464,800 527,900 509,500
Cost of sales (exclusive of depreciation, amortization and depletion)                 380,300 377,200 365,300
Selling, general and administrative                 7,900 8,500 7,900
Depreciation, amortization and depletion                 52,300 47,600 56,200
Exploration                 9,000 5,300 5,500
Operating income                 15,300 89,300 73,800
Capital investment                 106,300 60,000 36,500
Property and mine development, net 497,100       448,300       497,100 448,300 366,900
Total assets 837,600       930,200       837,600 930,200 889,100
Mexican IMMSA Unit | Reportable subsegments | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 381,600 448,600 437,700
Mexican IMMSA Unit | Intersegment sales | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 $ 83,200 79,300 71,000
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)                 $ 2,940,100 2,572,200 2,244,100
Peruvian Operations | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 2,940,100 2,572,200 2,244,100
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,702,100 1,509,400 1,362,800
Selling, general and administrative                 38,500 36,700 36,200
Depreciation, amortization and depletion                 328,100 237,400 203,600
Exploration                 16,500 18,500 14,400
Operating income                 854,900 770,200 627,100
Capital investment                 350,100 774,000 685,400
Property and mine development, net 3,879,200       3,797,200       3,879,200 3,797,200 3,389,800
Total assets $ 5,017,900       $ 4,813,100       5,017,900 4,813,100 4,314,500
Peruvian Operations | Reportable subsegments | Operating segment                      
Financial information relating to segments                      
Net sales (including sales to related parties, see Note 17)                 $ 2,940,100 $ 2,572,200 $ 2,244,100