LEASES: (Tables)

9 Months Ended

Sep. 30, 2024

LEASES:

Schedule of the operating lease expense recognized

Classification	2024		2023
Cost of sales (exclusive of depreciation, amortization and depletion)	$	77.4	$	86.9
Selling, general and administrative		0.1		0.1
Exploration		0.1		0.2
Total lease expense	$	77.5	$	87.2

Schedule of Maturities of lease liabilities

	Lease liabilities
Year	(in millions)
2024	$	27.7
2025		106.9
2026		106.6
2027		106.3
2028		106.0
After 2028		421.8
Total lease payments	$	875.3
Less: interest on lease liabilities		(150.3)
Present value of lease payments	$	725.0