高精度磁法在某铅锌矿体勘查中的应用

简易磁测表明目标勘查区矿石具有明显磁异常。为了在区内有效地指导探矿工作，使用HC-95a手持式氦（He4）光泵磁力仪，结合差分GPS定位，开展了地面高精度磁测工作。测区共进行19条测线，测点1 179个，测线总长23 200 m，圈定出3个长800~1 800 m的高磁异常带。其中1号异常位于岩体与地层接触带处，地表发现2处矿化露头，可以确定为矿化异常；2，3号异常规模较大，地表无矿化出露，尚需开展进一步工作判断引起磁性异常原因。

Application of High Precision Magnetic Survey in the Exploration of a Lead-zinc Deposit

The simple magnetic survey indicated that the ore-bodies outcropped in the target area had obvious magnetic anomaly.In order to effectively instruct the prospecting work in the target area, we used handheld HC-95a ground helium optically-pumped magnetometer in combination with high precision GPS survey in the ground high precision magnetic survey for buried ore-bodies.The survey involving 19 survey lines with a total length of 23 200 m and 1 179 measuring points was carried out, and three 800~1 800 m long belts of high magnetic anomalies were defined.One anomaly was found at the contact belt between the intrusive rock and stratum, where two mineralization outcrops on the ground surface were determined to have mineralization anomalies.Anomalies 2 and 3 were of large size and had no mineralization outcrop, and a further work should be made to find the cause for the magnetic anomaly.