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REVENUE: - Provisionally prices sales (Details)
lb in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
lb
$ / item
Copper  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ (0.1)
Copper | April 2021 through September 2021  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 135.6
Provisional price | $ / item 3.99
Molybdenum  
Provisionally priced sales:  
Provisional price sales adjustment amounts included in accounts receivable and net sales | $ $ 2.3
Molybdenum | April 2021 through June 2021  
Provisionally priced sales:  
Sales volume (in million lbs.) | lb 11.0
Provisional price | $ / item 11.05