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| The application of the ground high-precision magnetic method to the Roten iron ore district in Sierra Leone |
| LIU Jian-Xin1, LI Qin-Hua1, ZENG You-Yuan1, ZHENG Han2 |
1. No. 403 Geological Party, Sichuan Bureau of Geology and Mineral Resources Development, Emei 614200, China;
2. Sichuan Chuandi Mining Investment Co., Ltd., Chengdu 610036, China |
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Abstract Sierra Leone is located in a low magnetic latitude area around the magnetic equator. In view of the fact that the magnetic bodies of ΔT anomaly mainly produce negative anomalies associated with some positive anomalies at the low latitude area which is mainly under the condition of horizontal magnetization, the authors tried to make a comparative study of the magnetic body under the condition of demagnetization effect in combination with local geological conditions without considering remanent magnetism. The authors adopted the method of inverter 180° of experimental data and then made interpretation of the data. The upward continuation of different heights was utilized so as to effectively eliminate the shallow interference and highlight the anomaly characteristics of the deep layer. In combination with maximum gradient method, experience tangent method and Euler's equation method, the buried depth of the magnetic body and the level of general location were determined. Finally, 2.5 D interactive inversion was adopted to fit roughly the shape of the magnetic body. Drilling result is quite consistent with the inference.
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Received: 06 May 2013
Published: 10 August 2014
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