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本区为黄铁矿型铜和多金属矿的山区.在四个已知矿体中,有两个大型致密矿体已经爆破,进行了露天开采.故试验工作仅限于其他两个矿体.其一为致密铜铅锌矿(以下简称甲矿)矿体作急倾的平板状.中部浅,两端倾状.其二为浸染矿床(以下简称乙矿),由数个平行矿条组成,其中夹有富集的网脉状矿层.根据计算,体积如甲矿的致密矿体埋藏深度不超过200米,能产生0.4—2.5毫伽的重力异常.但同等尺度的浸染矿体刖仅当埋藏深度小于20米时,才能引起0.4毫伽的异常.因此要发现上述矿床,必须保证重力测量误差(包括重力仪观测误差,各项改正误差)不大于±0.1毫伽.
The area is a mountainous region of pyrite-type copper and polymetallic deposits, of which two large dense bodies have been exploded and open-pit mined, so the test work is limited to the other two ore bodies. One of them is the flat plate shape of the tight copper-lead-zinc ore (hereinafter referred to as “ore”) ore body, with a shallow center and a two-end inclined shape, the other is an impregnated deposit (hereinafter referred to as ore ores) , Which is rich in network reticulated ore layer.It is calculated that the volume of ore bodies such as ore bodies buried depth of no more than 200 meters, can produce 0.4-2.5 milligram of gravity anomalies.But the same scale of the ore body 刖 only When the burial depth is less than 20 meters, it can cause 0.4 milligram anomaly, so we must ensure that the gravimetric measurement errors (including the gravimeter observation errors and the correction errors) are not greater than ± 0.1 milligram.