• The first file (eidrb97.dbf) contains the demonstrated reserve base (DRB), a database of measured and indicated coal resources "in place" (in the ground, undisturbed) and occurring at depths and coalbed thicknesses considered potentially minable. The DRB is presented by State and presumable type of mining (underground or surface) for all coal ranks combined, and is allocated to ranges of heat and sulfur content.
• The second file (eirrsv97.dbf) is a database of the estimated recoverable reserves of U.S. coal, reported by the same categories as the DRB. Estimated recoverable reserves represent coal believed to be recoverable from the DRB and are derived from DRB coal resources by applying State, regional, or local accessibility factors and recovery rates.
  

Each of the databases is compressed into 39k self-extracting zip files that expand into DBF files of 60k. To expand either file, open Windows Explorer and go to the folder where you downloaded the file, then double click on the file name.

Note: Totals may not equal sum of components because of independent rounding. Heat and sulfur content categories of coal resources and reserves are rounded to one decimal place. Conversion of heat and sulfur contents to millions of Btu per short ton and pounds of sulfur per million Btu, respectively, produces values with multiple decimal places. These are rounded to one place within category allocations as an appropriate expression of accuracy for estimates extended to in-place coal resources and reserves.

Source: EIA Coal Reserves Database program, State geological and mineral resource surveys, and other geological reports.

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see also:
Projected Coal Supply & Demand to 2030
Historical Coal Data back to 1949
International Coal Data