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Spontaneous combustion
The generation of heat in bulk coal, leading to fire if uncontrolled, occurring as a result of coal and/or iron sulphide oxidation. Lower rank coals in general are more susceptible to spontaneous combustion. Laboratory tests and procedures can give a good indication of the propensity to self heat, but the only sure way is to conduct tests on large stockpiles of several thousand tonnes. A common laboratory test is determining the crossing point temperature or ignition temperature, in which coal is heated in an oxygen atmosphere.
