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SEGMENTS AND RELATED INFORMATION: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments | $ 1,669,300 | $ 1,745,900 | $ 1,801,500 | $ 1,602,000 | $ 1,499,000 | $ 1,257,900 | $ 1,173,200 | $ 1,219,400 | $ 6,818,721 | $ 5,149,500 | $ 3,734,280
Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 5,229,500 | 3,745,800 | 2,638,900
Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 544,100 | 683,400 | 436,700
Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 492,400 | 307,700 | 275,400
Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 209,800 | 212,500 | 176,600
Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 342,900 | 200,100 | 206,700
Mexican Open-pit |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,212,100 | 1,648,500 | 1,076,700
Mexican Open-pit | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,509,600 | 1,088,700 | 698,000
Mexican Open-pit | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 310,800 | 361,300 | 234,500
Mexican Open-pit | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 248,100 | 142,500 | 96,600
Mexican Open-pit | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 143,600 | 56,000 | 47,600
Mexican IMMSA Unit |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 546,200 | 512,700 | 560,200
Mexican IMMSA Unit | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 57,200 | 68,900 | 78,100
Mexican IMMSA Unit | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 184,200 | 140,400 | 194,700
Mexican IMMSA Unit | Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 209,800 | 211,700 | 175,500
Mexican IMMSA Unit | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 95,000 | 91,700 | 111,900
Peruvian Operations |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,186,500 | 3,125,900 | 2,223,500
Peruvian Operations | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,720,000 | 2,649,700 | 1,888,700
Peruvian Operations | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 233,300 | 322,100 | 202,200
Peruvian Operations | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 121,200 | 86,600 | 59,600
Peruvian Operations | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 112,000 | 67,450 | 73,000
Corporate and other eliminations |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (126,100) | 137,600 | (126,100)
Corporate and other eliminations | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (57,300) | (61,500) | (25,900)
Corporate and other eliminations | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (61,100) | (61,800) | (75,500)
Corporate and other eliminations | Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  |  | 800 | 1,100
Corporate and other eliminations | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | $ (7,700) | $ (15,100) | $ (25,800)

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