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SEGMENT AND RELATED INFORMATION: (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($)
Financial information related to segments |  |  |  |
Number of reportable segments | segment | 3 |  |  |
Financial information relating to segments |  |  |  |
Net sales | $ 1,583.9 | $ 1,245.1 |  |
Cost of sales (exclusive of depreciation, amortization and depletion) | 843.8 | 726.8 |  |
Selling, general and administrative | 21.4 | 26.3 |  |
Depreciation, amortization and depletion | 153.4 | 135.3 |  |
Exploration | 5.1 | 10.5 |  |
Environmental remediation | (10.2) |  |  |
Operating income | 570.4 | 346.2 |  |
Interest, net | (89.9) |  | $ (72.8) |
Other income (expense) | 4.8 | (0.5) |  |
Income taxes | (176.2) | (92.3) |  |
Equity earnings of affiliate, net of income tax | 6.2 | 5.1 |  |
Non-controlling interest | (0.9) | (0.6) |  |
Net income attributable to SCC | 314.4 | 185.1 |  |
Capital investment | 245.6 | 223.3 |  |
Property and mine development, net | 8,755.9 | 8,400.5 |  | $ 8,766.5
Total assets | 13,523.0 | 12,807.7 |  | $ 13,234.3
Corporate, other and eliminations |  |  |  |
Financial information relating to segments |  |  |  |
Net sales | (20.6) | (15.4) |  |
Cost of sales (exclusive of depreciation, amortization and depletion) | (19.7) | (40.9) |  |
Selling, general and administrative | 0.2 | 0.2 |  |
Depreciation, amortization and depletion | 6.1 | 6.6 |  |
Exploration | 1.8 | 3.7 |  |
Operating income | (9.0) | 15.0 |  |
Capital investment | 0.2 | 0.1 |  |
Property and mine development, net | 222.3 | 256.6 |  |
Total assets | (238.7) | (520.1) |  |
Mexican Open-pit | Operating segment |  |  |  |
Financial information relating to segments |  |  |  |
Net sales | 952.2 | 741.9 |  |
Cost of sales (exclusive of depreciation, amortization and depletion) | 464.8 | 394.4 |  |
Selling, general and administrative | 10.0 | 13.5 |  |
Depreciation, amortization and depletion | 98.6 | 64.9 |  |
Exploration | 0.5 | 1.6 |  |
Environmental remediation | (10.2) |  |  |
Operating income | 388.5 | 267.5 |  |
Capital investment | 57.3 | 109.1 |  |
Property and mine development, net | 5,171.1 | 5,024.3 |  |
Total assets | 8,481.7 | 8,542.5 |  |
Mexican IMMSA Unit | Operating segment |  |  |  |
Financial information relating to segments |  |  |  |
Net sales | 110.2 | 69.7 |  |
Cost of sales (exclusive of depreciation, amortization and depletion) | 83.0 | 68.7 |  |
Selling, general and administrative | 2.2 | 1.5 |  |
Depreciation, amortization and depletion | 13.4 | 9.4 |  |
Exploration | 0.7 | 1.8 |  |
Operating income | 31.5 | 3.7 |  |
Capital investment | 7.0 | 6.8 |  |
Property and mine development, net | 375.9 | 460.1 |  |
Total assets | 889.0 | 788.7 |  |
Mexican IMMSA Unit | Intersegment sales |  |  |  |
Financial information relating to segments |  |  |  |
Net sales | 20.6 | 15.4 |  |
Peruvian Operations | Operating segment |  |  |  |
Financial information relating to segments |  |  |  |
Net sales | 521.5 | 433.5 |  |
Cost of sales (exclusive of depreciation, amortization and depletion) | 315.7 | 304.6 |  |
Selling, general and administrative | 9.0 | 11.1 |  |
Depreciation, amortization and depletion | 35.3 | 54.4 |  |
Exploration | 2.1 | 3.4 |  |
Operating income | 159.4 | 60.0 |  |
Capital investment | 181.1 | 107.3 |  |
Property and mine development, net | 2,986.6 | 2,659.5 |  |
Total assets | $ 4,391.0 | $ 3,996.6 |  |

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