Spontaneous carbonization of oxidized high-volatile coal by a lightning strike

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Abstract
Five 1 m diameter pods of very high-rank coal (meta-anthracite) have been discovered in a normally high-volatile coal seam on Eagle Mountain, Elk Valley Coalfield, British Columbia. Two zones of colour alteration occur on the surface of local siltstones in the immediate vicinity of this occurrence and a thin overlying seam is reduced to ash. A study of the mineralogy of low-temperature coal ash (LTA) and also of the petrography of these high-rank pods provides evidence of localized temperatures of around 800 °C together with extreme rank gradients of 0.07% [Formula: see text]and supports a hypothesis that one or more lightning strikes were responsible for this occurrence.

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