经常海运的煤按照含碳量的高低，分为：褐煤（Lignite），含碳量25%～35%；次烟煤（Sub-Bituminous），含碳量35%～45%；烟煤（Bituminous），含碳量45%～85%；无烟煤（Anthracite），含碳量85%～95%。
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eocene sub-bituminous coal 始新世亚烟煤
Less dense types, such as sub-bituminous and lignite coal, can contain up to 50% water.
低浓度的煤炭，如亚煤烟煤和褐煤等，其含水量最高可达50%。
Coal reserves total over 34 billion tonnes consisting primarily of sub-bituminous coal.
艾伯塔省煤总蕴藏量超过340亿吨，其中以亚烟煤为主。
Wumuchang Area is a local bituminous coal district metamorphized by sub-volcanics in Yiming Coal Field which is located in northeast China.
五牧场区是内蒙东部伊敏褐煤盆地中一个因次火山侵入作用形成的局部的烟煤区。
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