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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (16.8)
Copper | July 2021 through November 2021  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 196.6
Provisional price | $ / item 4.26
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 79.9
Molybdenum | July 2021 through September 2021  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 11.7
Provisional price | $ / item 18.95