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Message: <blockquote data-quote="Eltab" data-source="post: 8145651" data-attributes="member: 6803337">Folklore:During a nasty strike at a coal mine, somebody threw a bunch of lumber in a mine cart, set it on fire, and pushed it down the entrance.  He did not burn the timbers that held up the entrance nor cause a collapse; he set a lesser seam of coal on fire.The blaze is now more like a slowly-travelling smoulder.  Once in a while, here or there, oxygen can get through the covering soil into the rock below.  Then steam shoots out of the ground for a while, or black smoke rises from a wild field.  One time, the fire passed below a small pond and created a hot spring.  People who live nearby know that if you dig a hole and the stones / rocks you pull out of the ground are warm to the touch - stop digging !</blockquote>