Abstract
Methane gas is one of the most serious dangers of undergroundcoal mining as its buildup can lead to methane gas explosion. InQuangNinh province- Vietnam, several coal mines such as TrangKhe II-IIIcoal mine, Khe Cham coal mine, especially MaoKhe mine that have highmethane content. At the MaoKhe coal mine,experimental data showedthatthe concentration of methane in coal seams at different depths were notsimilar.In order to ensure safety, this report has been undertaken todetermine a pattern of changing methane contents of coal seams atdifferent exploitation depths in MaoKhe underground coal mine.
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