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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | NOTE 5 - PROPERTY, PLANT AND EQUIPMENT The following table indicates the carrying value of each of the major classes of our consolidated property, plant and equipment:
| (In Millions)
| December 31,
| 2019 |  | 2018
Land rights and mineral rights | $ | 549.7 |  |  | $ | 549.6 |
Office and information technology | 71.9 |  |  | 70.0 |
Buildings | 157.8 |  |  | 87.2 |
Mining equipment | 581.9 |  |  | 548.5 |
Processing equipment | 791.8 |  |  | 645.8 |
Electric power facilities | 81.9 |  |  | 58.7 |
Land improvements | 32.5 |  |  | 23.8 |
Asset retirement obligation | 1.7 |  |  | 14.8 |
Other | 27.9 |  |  | 25.2 |
Construction-in-progress | 730.3 |  |  | 284.8 |
| 3,027.4 |  |  | 2,308.4 |
Allowance for depreciation and depletion | (1,098.4 | ) |  | (1,022.4 | )
| $ | 1,929.0 |  |  | $ | 1,286.0 |
At December 31, 2019 and 2018, we had deposits for property, plant and equipment of $34.0 million and $83.0 million, respectively, included in Other non-current assets. We recorded depreciation expense of $76.6 million, $65.6 million and $65.8 million in the Statements of Consolidated Operations for the years ended December 31, 2019, 2018 and 2017, respectively. We recorded capitalized interest into property, plant and equipment of $24.8 million and $6.5 million during the years ended December 31, 2019 and 2018, respectively. The net book value of the land rights and mineral rights is as follows:
| (In Millions)
| December 31,
| 2019 |  | 2018
Land rights | $ | 12.4 |  |  | $ | 12.4 |
Mineral rights: |  |  |
Cost | $ | 537.3 |  |  | $ | 537.2 |
Depletion | (134.1 | ) |  | (126.5 | )
Net mineral rights | $ | 403.2 |  |  | $ | 410.7 |
We recorded depletion expense of $7.5 million, $7.4 million and $6.8 million in the Statements of Consolidated Operations for the years ended December 31, 2019, 2018 and 2017, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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