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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 30.5
Copper | October 2024 through January 2025  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 153.8
Provisional price | $ / item 4.4
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (6.5)
Molybdenum | October 2024 through January 2025  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 17.2
Provisional price | $ / item 21.7