coal production.Ĭoal prices at surface mines are generally lower than prices at underground mines. Anthracite is the least abundant rank of coal in the United States, and it generally accounts for less than 1% of annual U.S. coal production in 2020.Īnthracite contains 86%–97% carbon and has a heating value that is slightly higher on average than bituminous coal. Bituminous coal accounted for about 45% of U.S. ![]() Bituminous is the most abundant rank of coal found in the United States. Bituminous coal was formed under high heat and pressure. About 46% of the coal produced in the United States in 2021 was subbituminous.īituminous coal contains 45%–86% carbon and has two to three times the heating value of lignite. Subbituminous coal typically contains 35%–45% carbon, compared with 25%–35% for lignite. ![]() Subbituminous coal has a higher heating value than lignite. Lignite is crumbly and has high moisture content. ![]() Lignite is the lowest rank of coal and has the lowest energy content.
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