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内蒙是砂金矿较多的地区。自1975年以来，我队在内蒙中、西部进行砂矿勘探。到目前为止，总计完成钻探工作量20，000米。最初，我们用北京型岩心钻机作为钻探设备，使用中发现该设备较重，搬迁不便，也不适应砂钻工艺特点。后又采用龙江型钻机，使用效果仍不佳。1977年经研究实验，我们选择了北京探矿厂的DPP—100型工程钻机。经改装采用外管超前、内管落后取样的双管钻进工艺。并将北京型岩心钻加压器改装使用，采用机械加压。施工效果良好，而且搬迁方便，工艺、操作简单，深受工人欢迎。去年，
Inner Mongolia is placer gold more areas. Since 1975, our team has conducted sand exploration in central and western Inner Mongolia. So far, a total of 20,000 meters of drilling work has been completed. Initially, we used a Beijing type core drilling machine as a drilling equipment, found that the equipment used in the heavier, inconvenient to move, nor suitable for sand drilling process characteristics. After the use of Longjiang drilling rig, the use of results are still not good. After years of research and experiment in 1977, we chose the DPP-100 engineering drilling machine of Beijing prospecting plant. The modified use of the outer tube ahead of the inner tube sampling backward two-pipe drilling process. And Beijing core drill pressure converter modified use of mechanical pressure. The construction effect is good, and the relocation is convenient, the craft is simple and the operation is welcomed by workers. last year,