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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)