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我矿自五十年代后期至今,一直在井下溜井口选别排弃废石,以优化出窿矿石,并在应用中不断地对其工艺进行研究和改进,从大尺寸平格筛、人工作业逐步改为小尺寸斜格筛、机械为主人工为辅的半机械化作业。废石排弃率由3%提高到8%以上。一九八四年原矿贫化率由优化前的78.8％下降到72％;矿石品位由优化前的0.25％提高到0.27％。从而在降低生产成本、节约能源、环境保护和控制矿山地压等方面都收到了较好的效果。
Since the late 1950s, mine has been sorting the abandoned waste rock at the wellhead to optimize out of ore, and continuously research and improve its technology in the application, from the large-size flat screen, artificial Gradually change the operation of small-size oblique grid sieve, machinery, supplemented by the main staff of semi-mechanized operations. Waste rock abandonment rate increased from 3% to 8%. In 1984, ore depletion rate dropped from 78.8% before optimization to 72%; ore grade increased from 0.25% before optimization to 0.27%. Thus, it has achieved good results in reducing production costs, saving energy, protecting the environment and controlling the underground pressure of mines.