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许昌铁矿是一九七四年下半年投入钻探工作的，现将会战区两年来在攻克厚覆盖层钻进方面的几点做法扼要介绍如下。一、地层特点和施工情况矿区上部为新生界第四、第三系冲积覆盖层，厚度250—350米，最厚处可达700米左右，主要由粘土、粉砂质粘土、姜石层、泥灰岩和由泥质或钙质胶结的砂岩、砾岩、砂砾岩等组成。基岩接触带一般有20—40米的风化破碎斜长片麻岩，下部为斜长角闪岩、变粒岩、脉岩、石英岩等，厚度400—600米，可钻性7—10级。
Xuchang Iron Mine was put into drilling work in the second half of 1974, and now several briefing on the acquisition of thick overburden drilling in the theater in the past two years are as follows. First, the stratum characteristics and construction conditions The upper part of the mining area for the Cenozoic Quaternary, alluvial cover, thickness 250-350 meters, the thickest up to about 700 meters, mainly by clay, silty clay, ginger layer, Marl and sandstone, conglomerate, glutenite, etc., which are cemented or calcareous cements. The bedrock contact zone generally has weathered crushed plagioclase gneiss 20-40 meters, the lower part is amphibolite, granulite, vein rock, quartzite, etc., the thickness of 400-600 meters, drillability of 7-10 level.