|
Charcteristic |
Lignite |
Bituminous |
Antracite |
|
Color |
Dark Brown |
Black |
Black |
|
Water Content (%) |
45 |
5 - 15 |
4 |
|
Noncom- bustible Com-pounds |
20 |
20 - 30 |
1 |
|
Carbon Content (%) |
35 |
55 - 75 |
95 |
|
Heat Value (BTU/pound) |
7,000 |
12,000 |
14,000 |
|
Cost to Mine/ 2000 pounds (1997) |
~$11 |
~$25 |
~$35 |