Coal 101: Sub-bituminous coal explained
Nearly half of the world’s proven coal reserves are sub-bituminous coal and lignite.
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Energy
Sub-bituminous coal, also known as black lignite, falls between lignite andbituminous coal, as per the classification system used in the United States and Canada. Geologically, it is a young coal, having formed anywhere from 251 million years ago to the present.
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