http://www.eia.gov/coal/reserves/
As of January 1, 2012, the demonstrated reserve base (DRB) was estimated to contain 483 billion short tons. In the United States, coal resources are larger than remaining natural gas and oil resources. Annually, EIA reports remaining tons of coal in the DRB, which is comprised of coal resources that have been identified to specified levels of accuracy and may support economic mining under current technologies.
As of January 1, 2012, the demonstrated reserve base (DRB) was estimated to contain 483 billion short tons. In the United States, coal resources are larger than remaining natural gas and oil resources. Annually, EIA reports remaining tons of coal in the DRB, which is comprised of coal resources that have been identified to specified levels of accuracy and may support economic mining under current technologies.
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