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REVENUE RECOGNITION: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
Sep. 30, 2018
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 2.0
Copper | October 2018 to January 2019  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 51.3
Provisional price | $ / item 2.80
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 0.3
Molybdenum | October 2018 to December 2018  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 11.4
Provisional price | $ / item 11.80