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Table 7. U.S. Coal Production by Coalbed Thickness and Mine Type, 2000
(Thousand Short Tons)
Coalbed Thickness (inches) Underground Surface Total
< 7 - 19 19
7-12 - 2,207 2,207
13-18 - 10,859 10,859
19-24 367 13,696 14,063
25-30 3,277 21,610 24,886
31-36 23,219 23,233 46,452
37-42 27,998 25,176 53,175
43-48 33,477 20,043 53,520
49-54 33,721 19,386 53,107
55-60 43,360 62,681 106,041
61-66 31,303 11,626 42,929
67-72 45,650 15,688 61,338
73-78 45,698 4,204 49,902
79-84 16,243 18,914 35,157
85-90 7,921 6,352 14,273
91-96 11,287 11,557 22,844
97-102 5,052 3,994 9,045
103-108 19,716 5,459 25,174
109-114 514 2,586 3,100
115-120 9,352 14,166 23,518
>  120 15,181 405,886 421,068
Unknown1 324 612 936
U.S. Total 373,659 699,953 1,073,612


1/ Includes mines with production of less than 10,000 short tons, which are not required to provide data.
       Notes: Coal production excludes silt, culm, refuse bank, slurry dam, and dredge operations except for Pennsylvania anthracite.  Totals may not equal sum of components due to independent rounding.
       Sources: Energy Information Administration, Form EIA-7A, "Coal Production Report" and U.S.  Department of Labor, Mine Safety and Health Administration, Form 7000-2, "Quarterly Mine Employment and Coal Production Report."