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SEGMENT AND RELATED INFORMATION: (Tables) | 3 Months Ended
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Mar. 31, 2020
SEGMENT AND RELATED INFORMATION: |
Schedule of financial information relating to Company's segments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2020
​ | ​ | (in millions)
​ |  | ​ |  | Mexican |  | ​ | ​ |  | Corporate, other |  | ​ | ​
​ | ​ | Mexican | ​ | IMMSA | ​ | Peruvian | ​ | and | ​ | ​ | ​
​ | ​ | Open-pit | ​ | Unit | ​ | Operations | ​ | eliminations | ​ | Consolidated
Net sales outside of segments | ​ | $ | 953.7 | ​ | $ | 107.7 | ​ | $ | 658.3 | ​ | $ | — | ​ | $ | 1,719.7
Intersegment sales | ​ |  | — | ​ |  | 26.8 | ​ |  | — | ​ |  | (26.8) | ​ |  | —
Cost of sales (exclusive of depreciation, amortization and depletion) | ​ |  | 465.1 | ​ |  | 112.2 | ​ |  | 411.0 | ​ |  | (32.5) | ​ |  | 955.8
Selling, general and administrative | ​ |  | 16.7 | ​ |  | 2.4 | ​ |  | 9.1 | ​ |  | 0.9 | ​ |  | 29.1
Depreciation, amortization and depletion | ​ |  | 91.4 | ​ |  | 10.6 | ​ |  | 81.3 | ​ |  | 9.6 | ​ |  | 192.9
Exploration | ​ |  | 0.7 | ​ |  | 2.9 | ​ |  | 1.6 | ​ |  | 3.4 | ​ |  | 8.6
Operating income | ​ | $ | 379.8 | ​ | $ | 6.4 | ​ | $ | 155.3 | ​ | $ | (8.2) | ​ | ​ | 533.3
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest, net | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (89.0)
Other income (expense) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (7.4)
Income taxes | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (221.7)
Equity earnings of affiliate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 1.0
Non-controlling interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (1.4)
Net income attributable to SCC | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 214.8
Capital investment | ​ | $ | 38.2 | ​ | $ | 25.3 | ​ | $ | 35.2 | ​ | $ | 2.3 | ​ | $ | 101.0
Property and mine development, net | ​ | $ | 4,420.7 | ​ | $ | 505.7 | ​ | $ | 3,832.5 | ​ | $ | 529.8 | ​ | $ | 9,288.7
Total assets | ​ | $ | 7,057.2 | ​ | $ | 815.9 | ​ | $ | 4,687.5 | ​ | $ | 3,651.5 | ​ | $ | 16,212.1
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, 2019
​ | ​ | (in millions)
​ |  | ​ |  | Mexican |  | ​ | ​ |  | Corporate, other |  | ​ | ​
​ | ​ | Mexican | ​ | IMMSA | ​ | Peruvian | ​ | and | ​ | ​
​ | ​ | Open-pit | ​ | Unit | ​ | Operations | ​ | eliminations | ​ | Consolidated
Net sales outside of segments | ​ | $ | 1,072.1 | ​ | $ | 101.2 | ​ | $ | 580.1 | ​ | $ | — | ​ | $ | 1,753.4
Intersegment sales | ​ |  | — | ​ |  | 19.9 | ​ |  | — | ​ |  | (19.9) | ​ |  | —
Cost of sales (exclusive of depreciation, amortization and depletion) | ​ |  | 419.6 | ​ |  | 100.0 | ​ |  | 348.0 | ​ |  | (23.5) | ​ |  | 844.1
Selling, general and administrative | ​ |  | 16.3 | ​ | ​ | 1.8 | ​ | ​ | 9.6 | ​ | ​ | 0.8 | ​ |  | 28.5
Depreciation, amortization and depletion | ​ |  | 85.0 | ​ |  | 12.9 | ​ |  | 74.9 | ​ |  | 8.8 | ​ |  | 181.6
Exploration | ​ |  | 0.4 | ​ |  | 2.0 | ​ |  | 2.9 | ​ |  | 0.2 | ​ |  | 5.5
Operating income | ​ | $ | 550.8 | ​ | $ | 4.4 | ​ | $ | 144.7 | ​ | $ | (6.2) | ​ | ​ | 693.7
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest, net | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (74.1)
Other income (expense) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 5.4
Income taxes | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (237.9)
Equity earnings of affiliate | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 2.1
Non-controlling interest | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (1.0)
Net income attributable to SCC | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 388.2
Capital investment | ​ | $ | 58.6 | ​ | $ | 25.0 | ​ | $ | 88.4 | ​ | $ | 1.1 | ​ | $ | 173.1
Property and mine development, net | ​ | $ | 4,780.6 | ​ | $ | 460.9 | ​ | $ | 3,798.4 | ​ | $ | 343.7 | ​ | $ | 9,383.6
Total assets | ​ | $ | 8,375.0 | ​ | $ | 942.2 | ​ | $ | 4,636.6 | ​ | $ | 1,588.8 | ​ | $ | 15,542.6
Schedule of provisionally priced copper and molybdenum sales outstanding | Following are the provisionally priced copper and molybdenum sales outstanding at March 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Sales volume |  | Priced at |  | ​
​ | ​ | (million lbs.) | ​ | (per pound) | ​ | Month of settlement
Copper | ​ | 83.5 | ​ | 2.24 | ​ | April 2020 through July 2020
Molybdenum | ​ | 14.8 | ​ | 8.43 | ​ | April 2020 through July 2020

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