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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.

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