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During longwall mining extraction, extremely high permeable spaces, called пїЅgobsпїЅ, are often created within crushed strata. Those gobs and abandoned: pathways, tunnels, ventilation entries or shafts, could be capacious storage deposits for coal-released gases, particular methane. This methane may be valuable source of both, energy and heat production, in active and post mining areas. Gases form crushed, fractured zones are explored by vertical boreholes drilled from surface, called gob gas ventholes (GGVs). GG...