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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (11.8)
Copper | October 2023 through February 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 207.9
Provisional price | $ / item 3.74
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (16.8)
Molybdenum | October 2023 through January 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 15.8
Provisional price | $ / item 22.50