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SEGMENT AND RELATED INFORMATION: (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments | $ 1,254.6 | $ 1,133.6 | $ 1,382.9 | $ 1,274.8 | $ 1,471.3 | $ 1,474.6 | $ 1,487.4 | $ 1,354.4 | $ 5,045.9 | $ 5,787.7 | $ 5,952.9
Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,994.1 | 4,518.1 | 4,654.8
Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 239.0 | 506.9 | 389.2
Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 226.7 | 273.2 | 393.7
Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 210.7 | 209.8 | 200.9
Other |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 375.4 | 279.7 | 314.3
Corporate, other and eliminations |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (67.6) | (90.4) | (96.9)
Corporate, other and eliminations | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (30.6) | (46.4) | (48.4)
Corporate, other and eliminations | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (26.5) | (33.0) | (38.7)
Corporate, other and eliminations | Other |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (10.5) | (11.0) | (9.8)
Mexican Open-pit | Operating segment |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,703.9 | 2,954.6 | 2,976.0
Mexican Open-pit | Operating segment | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,237.2 | 2,380.2 | 2,365.5
Mexican Open-pit | Operating segment | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 109.0 | 299.8 | 241.3
Mexican Open-pit | Operating segment | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 129.5 | 146.6 | 242.7
Mexican Open-pit | Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 228.2 | 128.0 | 126.5
Mexican IMMSA Unit | Operating segment |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 388.3 | 441.7 | 459.2
Mexican IMMSA Unit | Operating segment | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 30.6 | 46.4 | 48.4
Mexican IMMSA Unit | Operating segment | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 66.5 | 88.0 | 110.0
Mexican IMMSA Unit | Operating segment | Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 210.7 | 209.8 | 200.9
Mexican IMMSA Unit | Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 80.5 | 97.5 | 99.9
Peruvian Operations | Operating segment |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,021.3 | 2,481.8 | 2,614.6
Peruvian Operations | Operating segment | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 1,756.9 | 2,137.9 | 2,289.3
Peruvian Operations | Operating segment | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 130.0 | 207.1 | 147.9
Peruvian Operations | Operating segment | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 57.2 | 71.6 | 79.7
Peruvian Operations | Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | $ 77.2 | $ 65.2 | $ 97.7

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