渣滓溪矿区主要硬岩有石英砂岩、(砂)石英岩状砂岩,硅质板岩和砾岩等,可钻性均在8-10级以上,占钻孔岩层的20~30%,凡遇此岩层孔段,由于硬度高,研磨性弱,金刚石钻头一再出现“打滑”现象,钻头被抛光,往往回次时间长而进尺极低,观察钻头唇面可见其粘上了颜色发黑的润滑剂薄层,虽经氢氟酸 The main hard rocks in the Zhazixi mining area include quartz sandstone, quartz sandstone, siliceous slate and conglomerate. The drillability is all above 8-10, accounting for 20-30% of the borehole rock formation. Due to the high hardness and weak abrasiveness, the diamond drill bit repeatedly appears “slippery” phenomenon. The drill bit is polish and often goes back for a long time and the footage is extremely low. The drill lip face can be seen sticking to the color black lubrication Thin layer of agents, though hydrofluoric acid