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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
Mar. 31, 2019
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 2.8
Copper | April 2019 to July 2019  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 105.0
Provisional price | $ / item 2.94
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 4.1
Molybdenum | April 2019 to June 2019  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 10.2
Provisional price | $ / item 12.13