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2007年1月1日,吉林省珲春矿业集团八连城煤矿建成投产。按照地质部门和长春煤炭设计院提交的相关资料,确定八连城煤矿为低瓦斯矿井。然而在11901首采工作面回采时,经过初次来压后,工作面瓦斯涌出突然增高,工作面回风流中的瓦斯浓度经常超过1.0%,造成工作面停产。2007年8月,八连城煤矿被鉴定为高瓦斯矿井。
January 1, 2007, Hunchun Mining Group in Jilin Province Ellin City coal mine completed and put into production. According to the relevant data submitted by the geological department and Changchun Coal Design Institute, the Ehrlich Coal Mine is determined to be a low-gas mine. However, when the 11901 first mining face was recovered, the gas emission from the working face increased suddenly after the initial pressure was applied. The gas concentration in the return air flow on the working face frequently exceeded 1.0%, causing the face to stop production. August 2007, Ellin City coal mine was identified as high-gas mine.