我们符山矿4号矿体是采用无底柱分段崩落法生产的坑下矿山,自1970年投产后,由于种种原因四年未能达60万吨设计产量。1975年以来在毛主席一系列重要指示指引下,我们以阶级斗争为纲,坚持党的基本路线,贯彻“鞍钢宪法”,开展“工业学大庆”群众运动,依靠广大工人群众,在马鞍山矿山研究院和北京矿冶研究院的帮助下,组织了采矿攻关,使无底柱采 We Fu Shan No. 4 ore body is the use of subsea subsidence caving production of pit mine, put into operation since 1970, due to various reasons failed to reach 600,000 tons for four years the design output. Under the guidance of Chairman Mao’s series of important instructions since 1975, we used the class struggle as the key link, adhered to the party’s basic line, implemented the Anshan Iron and Steel Constitution, carried out the “Daqing Industrialization” mass movement, and relied on the masses of workers in the Maanshan Mining Research Institute and the Beijing Institute of Mining and Metallurgy, organized a mining research, so that bottomless mining