Study on forecasting methane content in coal seams of Nga Hai mine area

Abstract

Nga Hai coal mine area has large reserves managed by Quang Hanh Coal Company of Vietnam Mineral Industry Group. In this coal mine, there are 15 coal seams with industrial reserves. Each coal seam contains methane and the deeper it goes down the methane content tends to increase. Nga Hai coal mine is exploiting at-175 level and tends to exploit to-300 level. Currently, the mine is ranked III in terms of methane content in coal seams, while the coal mine is ranked III, which means it is hazardous in terms of the risk of methane fire and explosion. At the time of the methane explosion, Khe Cham coal mine was ranked III for methane. Thus, at present, the Nga Hai coal mine must have strict methane control measures to prevent methane gas fire and explosion like the former Khe Cham coal mine. To have effective methane control options, author took coal samples at the Nga Hai coal mine’s coal seams and analyzed to determine the methane content at different levels. Then author treated data analysis and interpolation methods, the least-squares method to predict methane concentrations at deep levels that cannot be sampled for analysis. With the Forecast of methane content in coal seams, author will provide the mine management company to take proactive measures to avoid the risk of methane gas explosion and take the initiative in mining plans safest and most effective waterfall.