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SEGMENT AND RELATED INFORMATION: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments | $ 1,651,100 | $ 1,552,400 | $ 1,659,900 | $ 1,805,900 | $ 1,669,300 | $ 1,745,900 | $ 1,801,500 | $ 1,602,000 | $ 6,669,266 | $ 6,818,721 | $ 5,149,500
Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 5,136,900 | 5,229,600 | 3,745,800
Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 450,500 | 544,100 | 683,400
Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 495,300 | 492,400 | 307,700
Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 195,900 | 209,800 | 212,500
Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 390,700 | 342,800 | 200,100
Mexican Open-pit |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 3,338,500 | 3,212,100 | 1,648,500
Mexican Open-pit | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,604,900 | 2,509,600 | 1,088,700
Mexican Open-pit | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 271,300 | 310,800 | 361,300
Mexican Open-pit | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 280,500 | 248,100 | 142,500
Mexican Open-pit | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 181,800 | 143,600 | 56,000
Mexican IMMSA Unit |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 512,600 | 546,200 | 512,700
Mexican IMMSA Unit | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 62,300 | 57,200 | 68,900
Mexican IMMSA Unit | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 161,500 | 184,200 | 140,400
Mexican IMMSA Unit | Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 194,900 | 209,800 | 211,700
Mexican IMMSA Unit | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 93,900 | 95,000 | 91,700
Peruvian Operations |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,952,300 | 3,186,500 | 3,125,900
Peruvian Operations | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 2,532,000 | 2,720,000 | 2,649,700
Peruvian Operations | Molybdenum |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 179,200 | 233,300 | 322,100
Peruvian Operations | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 113,600 | 121,200 | 86,600
Peruvian Operations | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 127,500 | 112,000 | 67,500
Corporate and other eliminations |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (134,100) | (126,100) | (137,600)
Corporate and other eliminations | Copper |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (62,300) | (57,200) | (61,500)
Corporate and other eliminations | Silver |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | (60,300) | (61,100) | (61,800)
Corporate and other eliminations | Zinc |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | 1,000 |  | 800
Corporate and other eliminations | Other: |  |  |  |  |  |  |  |  |  |  |
SALES VALUE PER SEGMENT: |  |  |  |  |  |  |  |  |  |  |
Net sales outside of segments |  |  |  |  |  |  |  |  | $ (12,500) | $ (7,800) | $ (15,100)

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- Definition Aggregate revenue from the sale of minerals and related products, and from rendering services such as exploration, development, mining, processing and providing mining support activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a),(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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