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

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3D model of a modular UCG to GTL plant (Linc Energy, 2013b).

Underground coal gasification – Part I: Field demonstrations and process performance - ScienceDirect

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

PDF) Unconventional Oil Production From Underground Coal Gasification And Gas To Liquids Technologies

Underground coal gasification – Part II: Fundamental phenomena and modeling - ScienceDirect

The design of ignition systems and a study of the development of the high temperature zone in well-type underground coal gasification - ScienceDirect

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Underground Coal Gasification: Another Clean Coal Option