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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (42.0)
Copper | October 2022 through March 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 277.5
Provisional price | $ / item 3.44
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 26.0
Molybdenum | October 2022 through January 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 15.4
Provisional price | $ / item 18.23