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Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT (Tables)

v3.19.3.a.u2
PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property Plant and Equipment [Table Text Block] Depreciation and depletion is recorded over the following estimated useful lives:
Asset Class
Basis
Life
听Land rights and mineral rights
Units of production
Life of mine
Office and information technology
Straight line
3 to 15 years
Buildings
Straight line
45 years
Mining equipment
Straight line/Double declining balance
3听to听20听years
Processing equipment
Straight line
10 to 45 years
Electric power facilities
Straight line
10 to 45 years
Land improvements
Straight line
20 to 45 years
Asset retirement obligation
Straight line
Life of mine

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


Book Value of Land and Mineral Rights Disclosure [Table Text Block]
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