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SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details)
lb in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
lb
Dec. 31, 2018
USD ($)
Provisionally priced sales:    
Provisional price sales adjustment amounts included in net sales $ 4,200,000 $ 10,000,000.0
Copper    
Provisionally priced sales:    
Provisional price sales adjustment amounts included in accounts receivable $ (4,000,000.0) 7,600,000
Copper | January through March 2019    
Provisionally priced sales:    
Sales volume (in million lbs.) | lb 116.8  
Provisional price $ 2.80  
Molybdenum    
Provisionally priced sales:    
Provisional price sales adjustment amounts included in accounts receivable $ 8,200,000 $ 2,400,000
Molybdenum | January through March 2019    
Provisionally priced sales:    
Sales volume (in million lbs.) | lb 13.7  
Provisional price $ 9.20