• investigations and assessment of the methane hazard for consecutive stages of exclusion from mining operations of workings, panels, levels, shafts of a mine subject to closure;
• variant analyses of simplification of the ventilation network models of gassy mines designed for closure;
• insulation technologies of workings in a gassy mine subject to closure;
• preparation of balance of accumulated free methane in workings of a closed mine in a conventionally adopted time interval in connection with hydrogeological conditions, tectonics and conditionings related to neighbouring mines;
• prediction of possibility of gas hazard occurrence on the surface in the mining area of a gassy mine subject to closure;
• investigations into the kinetics and intensity of mine gas flow to the zone close to the surface in the mining area of a closed mine;
• investigations into the kinetics and intensity of mine gas flow to the zone close to the surface in the mining area of a closed mine development of methods of active prevention against gas hazard in zones close to the surface in post-mining areas of closed