Abstract
An integrated approach to identification of man-made reservoirs within mining allotments of abandoned coal mines is proposed and tested, as well as determination of their methane content, which is based on the combined application of electrical exploration methods, measurement of ground-level concentrations of atmospheric gases and studies of mine methane isotopy. The boundaries of a man-made gas reservoir formed by the mined-out space of two abandoned coal mines were identified. A significant difference has been demonstrated between the content of light carbon isotopes of coal mine methane in the manmade reservoir and underlying coal seams. The paper discusses the impact of atmospheric pressure changes on the increase of ground-level methane concentrations. Drilling of gas-drainage boreholes in the decompression zones of the coal mass with subsequent connection to vacuum pumping stations providing methane collector degassing is recommended to limit methane release from the man-made collector into buildings and facilities located within the mining allotment of the abandoned mines.
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