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PROVISIONALLY PRICED SALES: (Details)
lb in Millions, $ in Millions
Mar. 31, 2016
USD ($)
lb
$ / item
Copper  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (6.8)
Copper | April 2016 to July 2016  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 141.0
Provisional price | $ / item 2.19
Molybdenum  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 3.2
Molybdenum | April 2016 to June 2016  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 14.5
Provisional price | $ / item 5.55