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May 26, 2020 Subbituminous coal typically contains 35%–45% carbon, compared with 25%–35% for lignite. About 44% of the coal produced in the United States in 2019 was subbituminous. Bituminous coal contains 45%–86% carbon and has two to three times the heating value of lignite. Bituminous coal was formed under high heat and pressure.Get Price