Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)

v3.19.3.a.u2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Depreciation Disclosure [Table Text Block] Depreciation and depletion is recorded over the following estimated useful lives:
Asset Class
 
Basis
 
Life
 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 to 20 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