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我队自1968年推广金刚石钻探技术以来，一直选用天然金刚石钻头为主要破岩工具。由于勘探的主要矿种金矿是蚀变破碎带型矿床，钻探施工矿区地层条件十分复杂，坍塌、掉块、漏失等现象十分严重，难以开动高转速，人造金刚石钻头的长处难以得到发挥，使用效果一直不甚理想，寿命短，时效低，直接影响到钻探生产效率和生产成本。从1986年开始，我队金刚石钻头的选用发生了转变；人造金刚石钻头从
Our team has been using natural diamond bits as the main rock breaking tool since its promotion of diamond drilling technology in 1968. Due to the alteration of fractured zone deposits, the stratigraphic conditions in the drilling and mining areas are very complicated. The phenomenon of collapse, dropout and leakage is very serious and it is difficult to start high speed. The advantages of synthetic diamond drill bits can not be fully utilized. The effect has been less than ideal, short life expectancy, low effectiveness, directly affect the drilling productivity and production costs. Since 1986, my team has changed the selection of diamond bits; synthetic diamond bits from