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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 43.9
Copper | April 2023 through August 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 213.1
Provisional price | $ / item 4.09
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 97.9
Molybdenum | April 2023 through July 2023  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 14.9
Provisional price | $ / item 24.00