Outburst DefinitionOutburst CavernOutburst SizeOutburst Definition Outburst has been defined as a spontaneous ejection of gas and coal from the solid face, where the gas is a mixture of methane and carbon dioxide. This definition is questioned in the use of the term “spontaneous” as this suggests an outburst occurs without [...] Read More  

Abutment Pressures When an opening is created in a coal seam, the stress that was present before the opening was created is re-distributed to the adjacent coal pillars that are left. The areas within the remaining coal where the vertical stress is greater than the average are called abutments and […]

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