论文部分内容阅读
目前砂金矿勘探主要采用人力冲击砂钻,孔径较小(一般使用108—146毫米井壁管),不但破坏岩层自然枯构,而且移动岩层层位界线,尤其是不能正确反映岩层的合金品位,影响正确圈定矿体,取得可靠的储量,为此必需通过一定数量的探井来验证钻孔所获得的资料。过去的探井以木材支护井壁,不但消耗大量木材,效率低,而且一遇到大水就没法施工。经
At present, placer gold prospecting mainly employs human impact sand drilling with a small hole diameter (usually using a 108- to 146-mm borehole wall pipe), which not only destroys natural rock formation but also shifts horizon boundaries of the rock, in particular, it does not accurately reflect the alloy grade of the rock. The impact of the correct delineation of the ore body, to obtain reliable reserves, for this purpose must pass a certain number of exploration wells to verify the data obtained by drilling. In the past, exploratory wells used timber to support the wellbore. They not only consumed large amounts of wood but were inefficient, and they could not be constructed as soon as they encountered large water. through