Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT

v3.10.0.1
PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
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.