TABLE 4.2 Typical Values for Characteristics of Major Commercial Steam Coals in the United States

 

Northern Appalachia

Central Appalachia

Illinois Basin

Powder River Basin (Wyoming and Montana)

Lignite (Texas and North Dakota)

Rank

High Volatile A Bituminous

High Volatile B Bituminous

High Volatile C Bituminous

Subbituminous C

Lignite A

Moisture (wt%) as received (AR)

7.0

7.5

12.5

29.8

32.0

Ash (wt%), AR

7.6

8.5

11.0

4.8

10

HHVa (Btu/lb), AR

13,100

12,650

11,300

8,500

7,200

Sulfur (wt%), dry

2.5

1.0

2.7

0.5

1

Chlorine, wt%, dry

0.1

0.1

0.2

0.01

0.01

NOTE: Data assembled from numerous sources.

aHigher Heating Value.

FIGURE 4.4 Productivity trends for surface and underground coal mines, illustrating the dramatic productivity increases over the past three decades. SOURCE: EIA (2006a).



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