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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2018
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 depreciable assets:
| (In Millions)
| December 31,
| 2018 |  | 2017
Land rights and mineral rights | $ | 549.6 |  |  | $ | 549.6 |
Office and information technology | 70.0 |  |  | 65.8 |
Buildings | 87.2 |  |  | 85.2 |
Mining equipment | 548.5 |  |  | 533.9 |
Processing equipment | 645.8 |  |  | 610.9 |
Electric power facilities | 58.7 |  |  | 56.9 |
Land improvements | 23.8 |  |  | 23.7 |
Asset retirement obligation | 14.8 |  |  | 16.9 |
Other | 25.2 |  |  | 25.2 |
Construction-in-progress | 284.8 |  |  | 32.6 |
| 2,308.4 |  |  | 2,000.7 |
Allowance for depreciation and depletion | (1,022.4 | ) |  | (966.9 | )
| $ | 1,286.0 |  |  | $ | 1,033.8 |
We recorded depreciation expense of $65.6 million, $65.8 million and $84.0 million in the Statements of Consolidated Operations for the years ended December 31, 2018, 2017 and 2016, respectively. We recorded capitalized interest of $6.5 million into construction-in-progress during the year ended December 31, 2018. The net book value of the land rights and mineral rights is as follows:
| (In Millions)
| December 31,
| 2018 |  | 2017
Land rights | $ | 12.4 |  |  | $ | 12.4 |
Mineral rights: |  |  |
Cost | $ | 537.2 |  |  | $ | 537.2 |
Depletion | (126.5 | ) |  | (119.1 | )
Net mineral rights | $ | 410.7 |  |  | $ | 418.1 |
We recorded depletion expense of $7.4 million, $6.8 million and $3.8 million in the Statements of Consolidated Operations for the years ended December 31, 2018, 2017 and 2016, respectively.

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- References No definition available. + Details
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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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