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SEGMENT AND RELATED INFORMATION: (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SALES VALUE PER SEGMENT:                      
Net sales outside of segments $ 1,535,200 $ 1,384,500 $ 1,410,200 $ 1,623,000 $ 1,651,100 $ 1,552,400 $ 1,659,900 $ 1,805,900 $ 5,952,943 $ 6,669,266 $ 6,818,721
Copper
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 4,654,800 5,136,900 5,229,600
Molybdenum
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 390,100 450,500 544,100
Silver
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 393,700 495,300 492,400
Zinc
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 200,300 195,900 209,800
Other
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 314,000 390,700 342,800
Mexican Open-pit
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 2,976,700 3,339,000 3,212,100
Mexican Open-pit | Copper
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 2,365,500 2,604,900 2,509,600
Mexican Open-pit | Molybdenum
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 242,200 271,300 310,800
Mexican Open-pit | Silver
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 242,700 280,500 248,100
Mexican Open-pit | Other
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 126,300 182,300 143,600
Mexican IMMSA Unit
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 458,500 513,000 546,200
Mexican IMMSA Unit | Copper
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 48,400 62,300 57,200
Mexican IMMSA Unit | Silver
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 110,100 161,500 184,200
Mexican IMMSA Unit | Zinc
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 200,300 195,900 209,800
Mexican IMMSA Unit | Other
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 99,700 93,300 95,000
Peruvian Operations
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 2,614,600 2,952,300 3,186,500
Peruvian Operations | Copper
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 2,289,300 2,532,000 2,720,000
Peruvian Operations | Molybdenum
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 147,900 179,200 233,300
Peruvian Operations | Silver
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 79,700 113,600 121,200
Peruvian Operations | Other
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 97,700 127,500 112,000
Corporate, other and eliminations
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 (96,900) (135,000) (126,100)
Corporate, other and eliminations | Copper
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 (48,400) (62,300) (57,200)
Corporate, other and eliminations | Silver
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 (38,800) (60,300) (61,100)
Corporate, other and eliminations | Other
                      
SALES VALUE PER SEGMENT:                      
Net sales outside of segments                 $ (9,700) $ (12,400) $ (7,800)