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Coal
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What is the name of thegas that is found in coal mines and seeps up through the ground causing a danger to people living in the area ?
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For more on marking an answer as the "Best Answer", please visit our FAQ.You may be thinking of Fire Damp which does contain a large proportion of Methane ... take a look at http://www.therhondda.co.uk/working/gases/fire%20d
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Radon is not likely in coalbearing strata. Radon is primarily found in igneous rocks, most notably in granite, and on release rises through fissures in the rock. It has been known to build up to worrying levels in buildings - hence the aim of sealing them on the underside to block access into the buildings and force the gas to travel out to the sides and into the atmosphere.