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REVENUE RECOGNITION: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
Jun. 30, 2018
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 2.1
Copper | July 2018 to September 2018  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 31.3
Provisional price | $ / item 2.96
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 13.8
Molybdenum | July 2018 to September 2018  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 10.0
Provisional price | $ / item 10.60