This paper analyzes the preconditions for small and medium-sized coal mines to increase coal recovery rate, and puts forward some paths and measures for the second mining of the coal resources.
分析了中小煤矿提高煤炭资源回收率的前提保障条件，提出了复采煤炭资源的途径和措施。
The successful development of Jin-0.4 electric LHD has provided ideal trackless mechanized equipment for the extraction in China's small-and medium sized underground mines.
金- 0.4型电动铲运机的研制成功，为我国中小型井下矿山采掘作业提供了较理想的无轨机械化设备。
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