Underground Coal Gasification (UCG)

Underground Coal Gasification (UCG) is a process for
exploiting coal that cannot be mined because the
seams are too deep, thin or fractured. 
Air or a combination of oxygen and steam are injected into
the gasification panel within the coal seam. The coal
is then heated and controlled reactions convert solid
coal into product gas, known as "syngas", which is
extracted at the surface.
The syngas is mixture of hydrogen, carbon monoxide, methane, CO2 and higher hydrocarbons.