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

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

Effects of throat sizing and gasification agents in a biomass downdraft gasifier: towards CO 2 -free syngas production - RSC Advances (RSC Publishing) DOI:10.1039/D3RA01408H

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

Cost Estimates of Coal Gasification for Chemicals and Motor Fuels

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

Applied Sciences, Free Full-Text

Underground Coal Gasification: Another Clean Coal Option

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

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

Energies, Free Full-Text

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