LEASES: (Tables)

6 Months Ended

Jun. 30, 2020

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the six months ended June 30, 2020 and 2019 was classified as follows (in millions):

Classification	2020		2019
Cost of sales (exclusive of depreciation, amortization and depletion)	$	57.5	$	57.6
Selling, general and administrative		0.1		0.1
Exploration		0.1		0.1
Total lease expense	$	57.7	$	57.8

(*) amount is lower than $0.1 million

Schedule of Maturities of lease liabilities

	Lease liabilities
Year	(in millions)
2020	$	57.7
2021		115.4
2022		112.6
2023		111.4
2024		103.6
After 2024		826.3
Total lease payments	$	1,327.0
Less: interest on lease liabilities		(315.8)
Present value of lease payments	$	1,011.2