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PROVISIONALLY PRICED SALES: (Details)
lb in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
lb
$ / item
In October 2015  
PROVISIONALLY PRICED SALES:  
Reduction of sales as effect of market price $ 1.9
Copper | October 2015 to December 2015  
PROVISIONALLY PRICED SALES:  
Nonmonetary notional amount of commodity (in million lbs.) | lb 80.7
Provisional price | $ / item 2.35
Molybdenum | October 2015 to January 2016  
PROVISIONALLY PRICED SALES:  
Nonmonetary notional amount of commodity (in million lbs.) | lb 12.0
Provisional price | $ / item 5.40
Copper And Molybdenum | After October 2015  
PROVISIONALLY PRICED SALES:  
Reduction in sales as effect of forward price $ 5.4