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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (36.3)
Copper | April 2024 through August 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 211.4
Provisional price | $ / item 4.01
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (1.5)
Molybdenum | April 2024 through July 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 16.2
Provisional price | $ / item 19.70