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砂矿床中90%的凿岩工作由孔径为146～219毫米的钢绳冲击钻完成.用这种钻机钻进多年冻结砂矿的钻进效率高,可达1000～1200米/台·月.但是用它仍不能完全符合砂矿勘探的质量要求,收回的地质样品过碎、过分液化、金属易贴在钻孔壁上.因此无法对疏松矿层的岩石组成和粒度组成以及有用矿物的筛析结果作出准确评价,也难以精确地测定含矿层的界限,结果会导致过高地估计矿层厚度.
90% of the rock drilling work is completed by a steel cord impact drill with a diameter of 146-219 mm, and the drilling efficiency of drilling a multi-year frozen sand mine with this drilling rig is as high as 1000-1200 m / unit / month. However, it still can not fully meet the quality requirements of sand prospecting, and the geological samples recovered are too fragile, excessively liquefied and the metal is easily attached to the wall of the borehole, so that the rock composition and the grain size composition of the loose ore bed and the sieving of useful minerals Accurate evaluation of the results, it is difficult to accurately determine the boundaries of ore-bearing, the result will lead to overestimation of the thickness of the ore.