Notes: Resources and reserves data are in billion short tons.
Darker shading in the diagram corresponds to greater relative data
reliability. The estimated recoverable reserves depicted near the
top of the diagram assume that the 19 billion short tons of
recoverable reserves at active mines reported by mine operators to
the Energy Information Administration (EIA) are part of the same
body of resource data. This diagram portrays the theoretical
relationships of data magnitude and reliability among coal resource
data. All numbers are subject to revision with changes in knowledge
of coal resource data.
Sources: The DRB estimate was compiled by the EIA as of
January 1, 1997. Estimated recoverable reserves were compiled in
EIA's Coal Reserves Data Base (CRDB) program. Recoverable reserves
at active mines were reported in EIA's Coal Industry Annual, 1996.
Identified resources and total resources are estimates as of January
1, 1974, compiled and published by the U.S. Geological Survey in
Coal Resources of the United States, January 1, 1974.
Original Internet Location:
Energy Information Administration