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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 21.4
Copper | July 2023 through October 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 243.4
Provisional price | $ / item 3.76
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 6.0
Molybdenum | July 2023 through October 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 15.8
Provisional price | $ / item 21.83