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为了适应生产发展的需要,我部在某矿区冲洪积大厚度的含金砂砾层中进行普查孔施工,最深的孔100米左右.为了给全面施工提供可靠的依据,决定先施工一个试验孔.孔位选在矿区中部,据物探电测资料,预计孔深62米见基岩.但钻进到82.95米尚未见到基岩.该孔的地层情况,除上部2.18米为堆积物外,其余为: 黄褐色含泥砂砾层砾石主要有砂质板岩、变质砂岩、冰碛砂砾岩、石英砂岩及少量花岗岩等.砾径一般4～6厘米,最大9～13厘米.该地层含泥约20～30%,含砂20～30%,砾石约占40～50%. 黄褐色、砖红色含砂砾粘土层砾石主要为石
In order to meet the needs of the development of production, the Ministry of Construction in a mining area alluvial thick gold-bearing gravel layer census hole construction, the deepest hole about 100 meters in order to provide a reliable basis for a comprehensive construction, decided to construct a test hole Hole selected in the middle of the mine, according to geophysical data, the expected hole depth of 62 meters to see the bedrock, but did not see bedrock 82.95 meters into the hole of the stratum, in addition to the upper 2.18 meters for the accumulation, The rest are: brown sandy mudstone gravel mainly sandy slate, metamorphic sandstone, moraine glutenite, quartz sandstone and a small amount of granite, etc. The gravel diameter is generally 4 to 6 cm, maximum 9 to 13 cm. About 20 to 30% sand 20 to 30%, gravel about 40 to 50%, yellow brown, brick red grit gravel clay mainly rock