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PROVISIONALLY PRICED SALES: (Details)
lb in Millions, $ in Millions
Mar. 31, 2017
USD ($)
lb
$ / item
Copper  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 3.0
Copper | April 2017 to May 2017  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 51.0
Provisional price | $ / item 2.65
Molybdenum  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 10.4
Molybdenum | April 2017 to June 2017  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 10.4
Provisional price | $ / item 8.85