coaltypesAnthracite has the least gas, lignites and fat coal the most. Anthracite and non baking coal are poor in gas and appropriate for the house fire because of the stable burning properties and low dust dispersal.

Coking coal: fat coal, is after degassing by heating to 1,200°C used as coke in the blast furnace as a carbon and energy source in the production of iron. Here, coal is used as a reducing agent. In the decomposition escape volatile components and create a porous structure.
The meliorating of fat coal to coke is similar to that of timber to produce charcoal, also intended to be able to achieve higher temperatures to smelt iron.
Fat coal is also used for the forge.

For the formation of a coal layer of 1 m thick, a layer of vegetation residues of 25 meters is necessary.