Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT (Tables)

v3.8.0.1
PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Value Of Each Of The Major Classes Of Consolidated Depreciable Assets
The following table indicates the carrying value of each of the major classes of our consolidated depreciable assets as of December 31, 2017 and 2016:
 
(In Millions)
 
December 31,
 
2017
 
2016
Land rights and mineral rights
$
549.6

 
$
500.5

Office and information technology
66.3

 
65.1

Buildings
86.8

 
67.9

Mining equipment
594.4

 
592.2

Processing equipment
617.0

 
552.0

Electric power facilities
57.0

 
49.4

Land improvements
23.7

 
23.5

Asset retirement obligation
19.2

 
19.8

Other
30.3

 
28.1

Construction in-progress
35.1

 
42.8

 
2,079.4

 
1,941.3

Allowance for depreciation and depletion
(1,028.4
)
 
(956.9
)
 
$
1,051.0

 
$
984.4

Book Value of Land and Mineral Rights Disclosure [Table Text Block]
The net book value of the land rights and mineral rights as of December 31, 2017 and 2016 is as follows:
 
(In Millions)
 
December 31,
 
2017
 
2016
Land rights
$
12.4

 
$
11.6

Mineral rights:

 

Cost
$
537.2

 
$
488.9

Depletion
(119.1
)
 
(112.2
)
Net mineral rights
$
418.1

 
$
376.7