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东风煤矿北青山井是年产6万吨的小井。现在第一、二水平(即-110米水平和-230水平)已经结束,第三水平(即-350水平)正在生产。近年来,由于该井应用了无煤柱开采,使掘进工程量减少13％左右,少掘巷道7000多米,节约资金70余万元,采区回采率达到并一直保持在96％水平,多回收煤炭21万多吨,相当于该井3.5年的设计年产量。无煤柱开采的推广应用,也改善了巷道维护条件,缓和了采掘接续关系,取得了较好的经济效果。
Dongfeng Coal Mine North Qingshan well is an annual output of 60,000 tons of wells. The first and second levels (ie -110 meters and -230 levels) are now over and the third level (-350 levels) is being produced. In recent years, due to the application of non-coal pillar mining, reducing the amount of tunneling about 13%, less dig tunnel more than 7000 meters, saving more than 700 million yuan, mining recovery rate reached and has remained at 96% level, more recovery of coal 21 Tons of tons, equivalent to 3.5 years of well design annual production. The popularization and application of non-coal pillar mining also improved the condition of roadway maintenance, eased the connection between mining and mining and achieved good economic results.