General layout of an underground coal gasifier. Note: not to scale;

Evidence of coal conversion in the Majuba underground coal gasification pilot plant, South Africa

Discussion on requirements of gasifier gas tightness for underground coal gasification production - ScienceDirect

Coal: exploration, reserves, and utilization

On the mitigating environmental aspects of a vertical well in underground coal gasification method

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Investigation into the operation of an autothermal two-section subbituminous coal fluidized bed gasifier

Genesis, controls and risk prediction of H2S in coal mine gas

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Plan of the UCG experimental mine in Lisichansk [7, 28].