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SEGMENT AND RELATED INFORMATION: - Financial (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
country
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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 outside of segments                 $ 5,379,800 $ 5,045,900 $ 5,787,700
Cost of sales (exclusive of depreciation, amortization and depletion)                 3,034,100 2,927,600 2,840,500
Selling, general and administrative                 94,300 99,400 103,400
Depreciation, amortization and depletion                 647,100 510,700 445,000
Exploration                 40,100 48,800 74,700
Environmental reclamation                   45,000 91,400
Operating income $ 470,500 $ 362,400 $ 385,100 $ 346,200 $ 187,500 $ 286,900 $ 503,100 $ 436,900 1,564,200 1,414,400 2,232,700
Interest, net                 (283,600) (199,900) (123,300)
Other income (expense)                 (24,600) (25,300) (40,800)
Income taxes                 (501,100) (464,900) (754,600)
Equity earnings of affiliate                 23,900 16,800 23,900
Non-controlling interest                 (2,300) (4,700) (4,900)
Net income attributable to SCC 171,900 $ 197,600 $ 221,900 $ 185,100 60,900 $ 98,400 $ 294,700 $ 282,400 776,500 736,400 1,333,000
Capital investment/expenditures                 1,118,500 1,250,000 1,529,800
Property and mine development, net 8,766,500       8,262,800       8,766,500 8,262,800 7,436,400
Total assets 13,234,300       12,593,200       13,234,300 12,593,200 11,393,900
Payment to acquire business, net of cash acquired                   100,400  
Corporate, other and eliminations                      
Financial information relating to segments                      
Net sales outside of segments                 (72,000) (67,600) (90,400)
Cost of sales (exclusive of depreciation, amortization and depletion)                 (73,400) (75,200) (57,700)
Selling, general and administrative                 2,300 1,100 5,100
Depreciation, amortization and depletion                 15,500 (17,200) (12,300)
Exploration                 16,900 19,500 27,700
Operating income                 (33,300) 4,200 (53,200)
Capital investment/expenditures                 4,700 105,100 9,000
Property and mine development, net 231,700       404,200       231,700 404,200 115,300
Total assets 9,600       383,300       $ 9,600 383,300 (58,600)
Mexican Open-pit                      
Financial information related to segments                      
Number of open-pit copper mines | item                 2    
Mexican Open-pit | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 3,234,300 2,703,900 2,954,600
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,523,200 1,390,000 1,146,600
Selling, general and administrative                 47,100 50,500 37,200
Depreciation, amortization and depletion                 364,700 265,000 225,500
Exploration                 5,200 7,800 3,900
Environmental reclamation                   45,000 91,400
Operating income                 1,294,100 945,600 1,450,000
Capital investment/expenditures                 537,000 820,500 1,121,300
Property and mine development, net 5,136,800       4,879,300       5,136,800 4,879,300 4,418,500
Total assets 8,174,400       7,459,800       $ 8,174,400 7,459,800 6,780,400
Mexican IMMSA Unit                      
Financial information related to segments                      
Number of underground poly metal mines | item                 5    
Mexican IMMSA Unit | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 351,100 320,700 351,300
Cost of sales (exclusive of depreciation, amortization and depletion)                 304,100 323,800 335,000
Selling, general and administrative                 7,400 6,400 16,300
Depreciation, amortization and depletion                 49,800 34,800 33,400
Exploration                 5,000 9,600 29,500
Operating income                 56,800 13,700 27,500
Capital investment/expenditures                 35,800 39,200 45,700
Property and mine development, net 448,700       395,800       448,700 395,800 389,000
Total assets 825,000       787,500       825,000 787,500 843,500
Mexican IMMSA Unit | Intersegment sales                      
Financial information relating to segments                      
Net sales outside of segments                 $ 72,000 67,600 90,400
Peruvian Operations                      
Financial information related to segments                      
Number of open-pit copper mines | item                 2    
Peruvian Operations | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 1,794,400 2,021,300 2,481,800
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,280,200 1,289,000 1,416,600
Selling, general and administrative                 37,500 41,400 44,800
Depreciation, amortization and depletion                 217,100 228,100 198,400
Exploration                 13,000 11,900 13,600
Operating income                 246,600 450,900 808,400
Capital investment/expenditures                 541,000 285,200 353,800
Property and mine development, net 2,949,300       2,583,500       2,949,300 2,583,500 2,513,600
Total assets $ 4,225,300       $ 3,962,600       $ 4,225,300 3,962,600 $ 3,828,600
El Pilar | Corporate, other and eliminations                      
Financial information relating to segments                      
Payment to acquire business, net of cash acquired                   $ 100,400