At Zasyadko mine the coal seams with methane-bearance of 20-25 m3/t.s.b.m. are developed, in the roof and floor of which there are thick(up to 30-40m) layers of gas-bearing sand-rocks. The accumulation of methane in sand stone can be 3-4m3 per ton. Besides, methane is presenting other rocks: siltstones, mudstones, limestone’s and even in water, in the dissolved condition, in the enumerated rocks methane is both as free(cavity, pore) and as sorbate, in the so-called diffused organic substance(DOS). The amount of organics in mudstones is from 15-20% to 30-40%. In siltstones and sandstones there is less organics, but because of their big amounts methane is also in big quantities in free and sorbate state.
     From the said above it follows that gas is almost everywhere in coal-bearing layer. It is necessary to take into account the fact that geological processes change structural and textural characteristics of the rocks, the conditions of their altitude, which leads to redistribution of gas potential in different layers in the mine field area. Thus, regional tectonic processes pressed the coal-bearing area, creating folds with raised(anticlines) and lowered(synclines) areas. As methane is lighter than air it goes up. That’s why in the mountain rock constant geological processes of mass transfer take place: gas goes up, water - vise versa - down.
    In positive structures of gas-bearing sand stones (main gas collectors) substantial methane volumes are accumulated part of which is in free state in the cavities in the structure roof. Objective proof of free gas presence is 24 cases of gas detection in exploratory wells during exploration and final exploration of the mine field(Zasyadko mine). Methane–abundance of blocks in such structures is up to 45 m3/t. Such gas-bearing structures are the sources of spontaneous bursting and methane blowers into mine workings. To prevent these accidents the preliminary degasation at the mine is needed(both with surface and underground wells).
    During 2001-2003 3 wells were driven at the section “Severorodinsky-2”, one being exploratory and two – experimental, equipped to carry out hydro caving. The works are fulfilled by the Center of alternative sources of energy.
    Three hydro caving were carried out. The 1st hydro caving one took place only in sandstone, there was isolated and one more hydro explosion was conducted at the hydro caving section sandstone-coal-sandstone. At present in 2 wells two objects are prepared hydro caving for testing. Factual parameters of the hydro explosion corresponded to the projected. Currently the works aimed at pumping of water and gas-discharge testing are carried out. The depth hydro caving of the objects is 1300m.