LEASES: (Tables)

9 Months Ended

Sep. 30, 2022

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the first nine months of 2022 and 2021 was classified as follows (in millions):

Classification	2022		2021
Cost of sales (exclusive of depreciation, amortization and depletion)	$	86.5	$	85.8
Selling, general and administrative		0.1		0.1
Exploration		0.1		0.1
Total lease expense	$	86.7	$	86.0

Schedule of Maturities of lease liabilities

	Lease liabilities
Year	(in millions)
2022	$	28.9
2023		115.2
2024		107.3
2025		106.2
2026		106.0
After 2026		628.8
Total lease payments	$	1,092.4
Less: interest on lease liabilities		(222.7)
Present value of lease payments	$	869.7