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从634队一年来所钻矿体看，其可钻性一般在9—10级，亦有部分矿体为11级，其级别高的原因是在矿体中夹杂着碧玉条带，夹碧玉条带越多，其级别愈高，因此在坚硬矿体钻进每班只进尺500—600公厘，有的钻机台月进尺只达到54公尺，在坚硬矿体中钻进效率低，主要是在矿体中夹碧玉条带，级别高，同时颗粒致密而均匀，光滑而摩擦阻力小钻进中产生打滑现象，所以矿体不能够因钻头压力对铁砂强行挤压而变形唯一
From the 634 team to drill the ore body for a year to see, its drillability is generally in the 9-10 level, there are some ore body is 11 level, the reason for its high level is in the ore body mixed with jasper strips, The higher the belt, the higher the grade. Therefore, only 500-600 mm of footage is required to drill in a hard ore body. Some drill tools only reach 54 meters per month. The drilling efficiency in hard ore bodies is low, mainly In the ore body folder jasper strip, high grade, at the same time, the particles are dense and uniform, smooth and frictional resistance small slip in slipping phenomenon, so the ore can not be due to bit pressure on the iron sand forced extrusion deformation only