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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
Jun. 30, 2019
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 6.4
Copper | July 2019 to November 2019  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 123.5
Provisional price | $ / item 2.72
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 5.7
Molybdenum | July 2019 to September 2019  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 13.8
Provisional price | $ / item 11.85