Spontaneous combustion in underground coal mines has become a serious problem, particularly in the caved area (gob). Recent statistics have shown that approximately 17% of a total of 87 underground coal mine fires in the United States are attributed to spontaneous combustion (DeRosa, 2004). Spontaneous combustion results from a self-heating process in exothermic conditions. The accumulated heat, if not removed, is conducive to the rapid increase of temperature and may result in mine fires or explosions.
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