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SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details)
lb in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
lb
Dec. 31, 2019
USD ($)
Provisionally priced sales:    
Provisional price sales adjustment amounts included in net sales $ (31,500,000) $ 4,200,000
Copper    
Provisionally priced sales:    
Provisional price sales adjustment amounts included in accounts receivable $ (17,400,000) (4,000,000.0)
Copper | January through April 2021    
Provisionally priced sales:    
Sales volume (in million lbs.) | lb 139.8  
Provisional price $ 3.52  
Molybdenum    
Provisionally priced sales:    
Provisional price sales adjustment amounts included in accounts receivable $ (14,100,000) $ 8,200,000
Molybdenum | January through March 2021    
Provisionally priced sales:    
Sales volume (in million lbs.) | lb 12.9  
Provisional price $ 10.03