开天窗放顶煤采煤法经济效益分析生产处胡学军，张日财务处１引言放顶煤综采是近二十年来兴起的厚煤层机械化开采的新技术，对于放顶煤综采工艺技术的评价，回收率和经济效益是关键性的指标，尤其是潞安矿务局，在厚煤层使用综采分层开采技术取得较好经济效益的情况下，应... Open Skylight Coal Top Coal Caving Method Economic Benefit Production Office Hu Xuejun, Zhang Ri Department of Finance 1 Introduction Fully mechanized top caving mining is a new technology of mechanized mining of thick seam that has emerged in recent 20 years. , Recovery and economic benefits are the key indicators, especially the Lu’an Mining Bureau, in the case of thick coal seams using fully mechanized mining technology to achieve better economic efficiency, should ...