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PROPERTY:
12 Months Ended
Dec. 31, 2023
PROPERTY:  
PROPERTY:

NOTE 5—PROPERTY:

At December 31, 

(in millions)

    

2023

    

2022

Buildings and equipment

$

17,439.3

$

16,718.3

Construction in progress

 

1,664.8

 

1,747.0

Mine development

 

320.7

 

273.2

Mineral assets

83.2

83.2

Land, other than mineral

 

277.5

 

275.4

Total property

 

19,785.5

 

19,097.1

Accumulated depreciation, amortization and depletion

 

(10,002.6)

 

(9,500.5)

Total property and mine development, net

$

9,782.9

$

9,596.6

Depreciation and depletion expense for the years ended December 31, 2023, 2022 and 2021, amounted to $825.7 million, $790.3 million and $797.3 million, respectively.