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The application of unmanned helicopter aeromagnetic method to the survey of the iron deposit in Xiangshannan-Dadiantang area, Ma’anshan City, Anhui Province |
CHEN Wei1( ), ZHAO Guo-Feng1( ), FEI Zhen-Zheng2, LUO Ding1, PENG Jiang-Ying1, HUANG Yan1, JIA Shuo1 |
1. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, China 2. No. 322 Geological Party, Bureau of Geology and Mineral Exploration of Anhui Province, Ma’anshan 243000, China |
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Abstract With Xiangshan South-Dadiantang area of the Ningwu volcanic basin as an example, the authors used the methods of geology and unmanned helicopter aeromagnetic to explore the prospecting work in the deep and peripheral parts of the old mine. Comprehensive analysis and fine inversion of aeromagnetic anomalies were conducted to determine the location of the borehole. All the drill holes intersected ores in the depth of the old mine, which proves the effectiveness of this method. The result also provides a reference for the rapid and effective development of prospecting work in the deep and peripheral areas of old mines in areas with similar working conditions in the future.
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Received: 31 July 2020
Published: 20 August 2021
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Corresponding Authors:
ZHAO Guo-Feng
E-mail: 894187326@qq.com;190285723@qq.com
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Geological condition of working area(according to the revision of the geological map provided by the 322 Geological Team) 1—Quaternary; 2—Cretaceous dawangshan formation; 3—diorite porphyrite; 4—trachyte; 5—stratigraphic boundary; 6—known fault; 7—survey area
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岩石名称 | 磁化率 (4π×10-6 SI) | 剩余磁化强度 (10-3 A·m-1) | 安山岩 | 150 | — | 凝灰岩 | 0 | 0 | 石英二长岩 | 0 | 0 | 闪长玢岩 | 2085~6310 | 1.47~376 | 蚀变闪长玢岩 | 14~30 | 1.76~17.8 | 磁铁矿化层 | 37 500~51 000 | 5 400~9 400 |
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Geophysical characteristics of rocks and minerals from working area
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Integration of aeromagnetic measurement system
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Magnetic anomaly contour maps after polar treatment and upward extension different heights a—RTP; b—upward continuation 100 m; c—upward continuation 200 m; d—upward continuation 300 m
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Map of aeromagnetic local anomalies(residue from upward continuation 300 m)
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The inferred linear structure (fault) a—the horizontal first order directional derivative of 135 degrees; b—the horizontal first order directional derivative of 45 degrees; c—RTP magnetic anomalies
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The inferred boundary of magnetic rock mass a—TA; b—TA-THDR; c—RTP magnetic anomalies
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Schematic diagram of exploration section location
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HC06 abnormal 2.5D forward fitting calculation results of two profiles 1—measured curve; 2—fitted curve; 3—flight altitude; 4—number of aeromagnetic anomaly; 5—Quaternary; 6—Cretaceous Dawangshan formation; 7—altered diorite porphyrite; 8—diorite porphyrite; 9—known iron ore body; 10—presumed iron ore body; 11—goaf; 12—known borehole
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