曾家山一井是个小型矿井。从1979年开始,矿井由浅部逐步转入深部开采,同时,计划产量超设计能力,采掘工作面增加,由于矿井通风能力不足,风量日趋紧张,安全威胁严重,被迫以风定产,3年来,通过以 Zeng Shan a well is a small mine. From 1979, the mine gradually shifted from shallow to deep mining. At the same time, the planned output surpassed the designed capacity and the working face increased. Due to inadequate ventilation capacity of the mine, the air volume became more and more tense, the security threat was severe, and forced to start production by the wind over the past three years Through to