|
Coal Production by Coalbed Thickness and Mine Type, 2007
(Thousand Short Tons) |
Coalbed
Thickness
(inches) |
Underground |
Surface |
Total |
< 7 |
- |
274 |
274 |
7-12 |
- |
3,426 |
3,426 |
13-18 |
252 |
6,311 |
6,563 |
19-24 |
731 |
13,535 |
14,266 |
25-30 |
3,797 |
20,461 |
24,258 |
31-36 |
16,998 |
29,016 |
46,014 |
37-42 |
24,733 |
19,221 |
43,955 |
43-48 |
35,786 |
29,982 |
65,767 |
49-54 |
27,886 |
23,577 |
51,463 |
55-60 |
41,122 |
25,184 |
66,306 |
61-66 |
34,433 |
10,378 |
44,811 |
67-72 |
58,805 |
25,183 |
83,988 |
73-78 |
7,390 |
1,291 |
8,681 |
79-84 |
18,853 |
27,025 |
45,878 |
85-90 |
7,927 |
3,114 |
11,041 |
91-96 |
13,667 |
11,760 |
25,427 |
97-102 |
13,016 |
6,191 |
19,208 |
103-108 |
7,375 |
8,265 |
15,640 |
109-114 |
4,872 |
13,363 |
18,235 |
115-120 |
640 |
2,715 |
3,354 |
> 120 |
33,322 |
512,689 |
546,011 |
Unknown[1] |
187 |
727 |
2,070 |
U.S. Total |
351,790 |
793,690 |
1,146,635 |
|