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我局地质四队某矿区的矿层上部，覆盖着一层四、五百米厚的火山岩—主要为晶玻屑凝灰熔岩，结构致密完整，可钻性均在十一级左右，是一种岩石坚硬、研磨性弱的“打滑层”。在这种地层中，先后采用胎体硬度为中硬和软的、金刚石强度12000～18000公斤/平方厘米的60~#～100~#的人造金刚石孕镶钻头，效率都很低，一般钻速在0.05～0.20米/小时，最高也只达到0.40米/小时，有的钻头就是打滑不进尺。平均钻头寿命为6.34米，最高13.27米，最低1.38米，严重影响小口径钻探的效率及其经济效果。
The upper part of the ore body in a mining area of the Bureau of Geological Field IV is covered with a layer of volcanic rocks of 4-500 meters in thickness, mainly composed of crystalline vitrified tuff lava. The structure is dense and complete with drillability of about eleven, Hard rock, grinding weak “slippery layer.” In this stratum, artificial diamond impregnated drill bits of 60 ~ # ~ 100 ~ # with hardness of 12 ~ 18000 kg / cm2 and hardness of medium hard and soft are adopted successively. The efficiency is very low. Speed of 0.05 ~ 0.20 m / h, the highest only reached 0.40 m / h, and some drill is not slippery feet. The average drill life of 6.34 meters, the highest 13.27 meters, the lowest 1.38 meters, seriously affecting the efficiency of small-diameter drilling and its economic effects.