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PROVISIONALLY PRICED SALES: (Details)
lb in Millions, $ in Millions
Jun. 30, 2017
USD ($)
lb
$ / item
Copper  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 5.6
Copper | July 2017 to September 2017  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 57.3
Provisional price | $ / item 2.70
Molybdenum  
PROVISIONALLY PRICED SALES:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (11.9)
Molybdenum | July 2017 to September 2017  
PROVISIONALLY PRICED SALES:  
Sales volume (in million lbs.) | lb 11.5
Provisional price | $ / item 7.18