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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 12.2
Copper | July 2024 Through October 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 190.7
Provisional price | $ / item 4.37
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 20.2
Molybdenum | July 2024 Through October 2024  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 16.2
Provisional price | $ / item 22.90