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%。

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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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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。

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