SEGMENT AND RELATED INFORMATION: - Provisional Sale (Details) lb in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) lb $ / lb	Dec. 31, 2023 USD ($)
Provisionally priced sales:
Provisional price sales adjustment amounts included in net sales	$ (41.6)	$ 36.0
Copper
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (27.5)	17.8
Copper | January through April 2025
Provisionally priced sales:
Sales volume (in million lbs.) | lb	149.0
Provisional price | $ / lb	3.96
Molybdenum
Provisionally priced sales:
Provisional price sales adjustment amounts included in accounts receivable	$ (14.1)	$ 18.2
Molybdenum | January through April 2025
Provisionally priced sales:
Sales volume (in million lbs.) | lb	13.0
Provisional price | $ / lb	21.08