Application of DC electrical method in prospecting hidden veins around the rare metal deposit of Jiajika, China
Abstract:
As more attention is paid to new energy metal application represented by lithium, looking for lithium resources will become increasingly significant. Inorder to achieve the goal in mineral exploration in concealed areas, DC electrical emthod is applied to explore and delineate the pegmatite veins in Rongxuka around Jiajika rere metal deposit. Three NW-trending anomalies with high resistance are delineated in the area. Anomaly No. J3 with high-resistance is conincidence with R2 containing lithium pegmatite veins among these 3 anomalies. Pegmatite out croppings are found in anomaly No.J1 and J2 partly, indicating that the anomaly is caused by hidden pegmatite veins. It can not only be the prospecting indicator for searching Jiajika typed lithium deposit, but also the effective references and guidance for relevant area in prospecting the hideen Jiajika typed lithium deposit.
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Fig 1. Tectonic map of the studay are |
Fig.2 Metallogenic belts division map in studay area |
1. High-power Eelectrical Survey:
System including:
• WDFZ-5T IP Transmitter
• WDJS-3 IP Receiver
• 5KW Generator
2. Measurement
It takes mid-graident array with trasmitting electrode AB=1200m, measuring electrode MN=40M, the survey distance is 2/3 of AB, side distance is no more than 1/5 of AB. The transmitting cycle is 16s, power-off delay time is 200ms, sampling width is 40ms.
The survey profile has 9, measuring point space is 20m, the survey line direction is 247 degree. Before measurement, we take some method to reduce the grounding resistance, which will not exceed 500ohm, power current is about 1.4A.
Anomaly map of apparent resistivity in Ronxuka area
3. Conclusion:
1 The result fully proves the validity of the DC electric mid-graident method in detecting the high resistance rock mass. From the results of the present work, the main area of lithium and pegmatite veins (high impedance) closely related to mineralization, mainly distributed in the inner pegmatite veins.
2 Among the 3 north-west high-resistivity anomaly in the inner ring, J3 abnormal is compatible with the known R2 containing pegmatite; J1, J2 two high resistance abnormal local pegmatite rock outcrop; that anomaly caused by buried pegmatite veins. It is suggested to carry out the engineering verification of 3 high resistance abnormal zones.
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