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SEGMENTS AND RELATED INFORMATION: (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Provisionally priced sales    
Provisional price sales adjustment amounts included in accounts receivable $ (2.0) $ 12.1
Provisional price sales adjustment amounts included in net sales (2.0) 12.1
Copper
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 64,300,000  
Provisional price sales adjustment amounts included in accounts receivable 1.4 4.8
Provisional price sales adjustment amounts included in net sales 1.4 4.8
Copper | January 2012
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 52,500,000  
Provisional price 3.44  
Copper | February 2012
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 11,800,000  
Provisional price 3.45  
Molybdenum
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 10,300,000  
Provisional price 13.35  
Provisional price sales adjustment amounts included in accounts receivable (3.4) 7.3
Provisional price sales adjustment amounts included in net sales $ (3.4) $ 7.3
Molybdenum | January 2012
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 4,400,000  
Provisional price 13.35  
Molybdenum | February 2012
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 3,200,000  
Provisional price 13.35  
Molybdenum | March 2012
    
Provisionally priced sales    
Nonmonetary notional amount of commodity (in million lbs.) 2,700,000  
Provisional price 13.35