A Geophysical Survey with Magnetic Method for Interpretation of Iron Ore Deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia

Geophysical survey with magnetic method to interpret the iron ore deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia was carried out during six month, i.e. March –August 2017, covering the area in the geographical position of 109.3462° – 109.3718° E and 7.6958° – 7.7098° S. This survey has produced total magnetic field strength data at each measuring point in the research area. The magnetic field strength data which have been obtained, then be processed, corrected, and mapped so that the local magnetic anomaly contour map can be obtained. The local magnetic anomaly contour map shows the distribution of magnetic anomalous sources in the subsurface of research area. The 2D-modeling of magnetic anomalies data has been carried out along the AB trajectory extending on the local magnetic anomaly contour map from the position of A(109.3463°E and 7.7023°S) to B (109.3688°E and 7.7053°S), so that some subsurface anomalous objects is obtained. The modelling results of magnetic anomalies data show that the research area is estimated to have the potential of iron ore deposits. The subsurface rocks deposits containing iron ore are estimated to be located below the AB trajectory with a length about of 164.85 meters, a depth ranging of 1.709 – 31.909 meters, and a magnetic susceptibility value of 0.0122 cgs unit. These rocks are interpreted as sand deposits which coexists with silt and clay containing iron ore grains from the alluvium formation. Further, iron ore is also estimated to be present in the rocks deposits below the AB trajectory which have a depth of 24.405 – 49.809 meters and 3.989 – 11.111 meters, with the magnetic susceptibility values of 0.0093 and 0.0073 cgs units.

Download Full-text

APPLICATION OF MAGNETIC SURVEY TO EXPLORE THE IRON ORE DEPOSITS IN THE NUSAWUNGU COASTAL REGENCY OF CILACAP CENTRAL JAVA

Jurnal Penelitian Fisika dan Aplikasinya (JPFA) ◽

10.26740/jpfa.v7n2.p79-88 ◽

2017 ◽

Vol 7 (2) ◽

pp. 79 ◽

Cited By ~ 1

Author(s):

S Sehah ◽

Sukmaji Anom Raharjo

Keyword(s):

Magnetic Susceptibility ◽

Iron Ore ◽

Research Area ◽

Ore Deposits ◽

Magnetic Data ◽

Magnetic Survey ◽

Magnetic Minerals ◽

The Third ◽

Central Java ◽

Iron Ore Deposits

The research aiming to explore the iron ore deposits in the Nusawungu coastal Regency of Cilacap has been conducted using the magnetic survey. The acquisition of magnetic data was conducted in April – Mei 2017, covering the area in the ranges of 109.314° – 109.345°E and 7.691° – 7.709°S. The obtained magnetic field strength data were corrected, reduced, and mapped to obtain the contour map of local magnetic anomaly. The modeling process was carried out along the path extending over the map from the positions of 109.314°E and 7.695°S to 109.335°E and 7.699°S, so that some subsurface anomalous objects are obtained. The lithological interpretation was performed to identify the types of subsurface rocks and their formations based on the magnetic susceptibility value of each anomalous objects and supported by the geological information of the research area. Based on the interpretation results, three rocks deposits of alluvium formations were obtained, which are estimated to contain iron ore. The first deposit has a length of 164.85 m, a depth of 0.57 – 8.43 m, and a magnetic susceptibility value of 0.0097 cgs. The second deposit has a length of 376.28 m, a depth of 2.56 – 19.66 m, and a magnetic susceptibility value of 0.0108 cgs. The third deposit has a length of 1,306.26 m, a depth of 3.70 – 58.69 m, and a magnetic susceptibility value of 0.0235 cgs. Out of the whole rocks deposits, the third rock deposit is interpreted to have the most prospective iron ore. This interpretation based on its high magnetic susceptibility value, which indicates the presence of many magnetic minerals (i.e. iron ores) in the rock.

Download Full-text

Types and mineral composition of gold-platinoid mineralization of giant iron ore deposits of the Kursk Magnetic Anomaly (Central Russia)

Doklady Earth Sciences ◽

10.1134/s1028334x10010319 ◽

2010 ◽

Vol 430 (1) ◽

pp. 142-146 ◽

Cited By ~ 1

Author(s):

N. M. Chernyshov

Keyword(s):

Magnetic Anomaly ◽

Mineral Composition ◽

Iron Ore ◽

Ore Deposits ◽

Kursk Magnetic Anomaly ◽

Central Russia ◽

Iron Ore Deposits

Download Full-text

PENYELIDIKAN GEOMAGNET BIJIH BESI DI WILAYAH JORONG KOTA BIRAH, KECAMATAN SUNGAI PAGU KABUPATEN SOLOK SELATAN

Jurnal Teknologi Informasi dan Pendidikan ◽

10.24036/tip.v10i3.21 ◽

2017 ◽

Vol 10 (3) ◽

pp. 64-72

Author(s):

Ceni Febi Kurnia Sari ◽

Yoszi Mingsi Anaperta

Keyword(s):

Magnetic Anomaly ◽

Iron Ore ◽

Intensity Variation ◽

Geological Structure ◽

Ore Deposits ◽

The North ◽

Side Rock ◽

Geological Conditions ◽

Iron Ore Deposits ◽

North Part

The measureable magnetic field intensity variation is then interpreted in the form of the distribution of the magnetic material below the surface, then used as the basis for the prediction of possible geological conditions observed. The iron ore deposits in the survei area are generally interpreted as a form of sediment that fills the rock cavities, especially in limestone cavities. This occurs due to the geological structure that gives space for the placement of mineralization of ore deposits in the side rock zone. The value of this magnetic anomaly is located in the west, the eastern, and also in the north part. Keywords: Geomagnet Method, Iron Ore, Magnetic Properties, Magnetic Value, Magnetic Anomaly Value.

Download Full-text

Pemodelan 2D Batuan Bawah Permukaan Daerah Mamuju Sulawesi Barat Dengan Menggunakan Metode Magnetik

Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics ◽

10.15408/fiziya.v1i1.8999 ◽

2018 ◽

Vol 1 (1) ◽

Author(s):

Muhammad Irsyad ◽

Sutrisno Sutrisno ◽

Dwi Haryanto

Keyword(s):

Magnetic Anomaly ◽

Magnetic Anomalies ◽

Magnetic Method ◽

Government Agencies ◽

Quantitative Interpretation ◽

Magnetic Intensity ◽

Contour Map ◽

A Value ◽

Qualitative Interpretation ◽

The Earth

Abstrak. Batuan merupakan benda yang berasal dari magma yang mendingin di dalam bumi. Untuk mengetahui kondisi batuan perlu di lakukan penelitian. Mamuju merupakan daerah yang sedang hangat dalam perbincangan peneliti tentang bagaimana kandungan di bawah permukaan daerah Mamuju, Sulawesi Barat. Daerah ini juga merupakan daerah yang diteliti oleh instansi-instansi pemerintah termasuk PTBGN-BATAN. Penelitian ini bertujuan untuk melakukan pemodelan bawah permukaan bumi. Tujuannya untuk memberikan informasi tentang kondisi baik itu bentuk maupun kedalaman batuan. penelitian ini menggunakan metode magnetik dan metode ini merupakan metode yang tepat untuk membuat model bawah permukaan bumi. Hasil interpretasi kualitatif diperoleh peta kontur intensitas magnetik total dan anomali magnetik. Peta kontur intensitas magnetik total memiliki nilai sebesar 41286,5 – 42280 nT. Sedangkan anomali magnetik memiliki nilai -760,1 – 231,8 nT. Daerah A dan daerah B merupakan daerah yang memiliki anomali tinggi. Hasil interpretasi kuantitatif didapat ada 4 model bawah permukaan yang masing-masing terdapat batuan yang sama yaitu batuan breksi dengan nilai suseptibilitas 0,0006 – 0,00075 satuan cgs dan batuan lava dengan nilai suseptibilitas 0.001 – 0.0015 satuan cgs. daerah yang dilakukan pemodelan fokus pada daerah Hulu Mamuju, hal ini disebabkan karena menurut peta kontur daerah tersebut merupakan daerah yang memiliki anomali magnetik yang tinggi. Abstract. The rocks are objects derived from the magma cooled in the earth. To determine the condition of the rock is necessary to do research. Mamuju is an area that is warm in conversation investigators about how the content of subsurface area Mamuju, West Sulawesi. This area is also the area investigated by government agencies including PTBGN-BATAN. This study aimed to modeling subsurface. The goal is to provide information about the condition of both the shape and depth of rock. This study uses a magnetic method and this method is an appropriate method to create a model of the earth's subsurface. Qualitative interpretation of results obtained contour map of total magnetic intensity and magnetic anomalies. The total magnetic intensity contour map has a value of 41286.5 to 42280 nT. While the magnetic anomaly has a value of -760.1 - 231.8 nT. Area A and area B is an area that has a high anomaly. Results obtained quantitative interpretation there are 4 models of the subsurface that each contained the same rock is rock breccia with values susceptibility of 0.0006 to 0.00075 cgs units and lava rock with susceptibility value 0.001 - 0.0015 cgs unit. modeling area focuses on upstream area Mamuju, this is because according to the contour map of the area is an area that has a high magnetic anomaly.

Download Full-text

Rock-Magnetic and Oxide Microscopic Studies of the El Laco Iron Ore Deposits, Chilean Andes, and Implications for Magnetic Anomaly Modeling

International Geology Review ◽

10.2747/0020-6814.45.6.533 ◽

2003 ◽

Vol 45 (6) ◽

pp. 533-547 ◽

Cited By ~ 13

Author(s):

L. M. Alva-Valdivia ◽

M. L. Rivas ◽

A. Goguitchaichvili ◽

J. Urrutia-Fucugauchi ◽

J. A. Gonzalez ◽

...

Keyword(s):

Magnetic Anomaly ◽

Iron Ore ◽

Ore Deposits ◽

Iron Ore Deposits ◽

Microscopic Studies ◽

Chilean Andes

Download Full-text

Upward Continuation of Subsurface Anomalies Utilizing Magnetic Data in The Bedadung Watershed, Jember City

Jurnal ILMU DASAR ◽

10.19184/jid.v16i2.1516 ◽

2016 ◽

Vol 16 (2) ◽

pp. 69

Author(s):

Yudhistira Adi Nugraha ◽

Puguh Hiskiawan ◽

Supriyadi Supriyadi

Keyword(s):

Data Analysis ◽

Magnetic Anomaly ◽

Research Area ◽

Magnetic Data ◽

Magnetic Method ◽

Magnetic Characteristics ◽

Data Input ◽

Contour Map ◽

Upward Continuation ◽

Subsurface Material

Magnetic method is a geophysics method to determine the kind of subsurface material in certain depth by identifying the magnetic characteristics of rock based on the value of magnetic suspetibility. The data analysis described the subsurface anomaly using upward continuation filter. It separated local anomaly and regional anomaly by lifting research area in certain elevation. The raw data research was the total of magnetics data around Bedadung watershed, Jember. It was proceeded to obtaine magnetic anomaly curve on 5 line in contour map. It was digitalized and use as data input of magpick and upward continuation filter program. Upward continuation program was conducted using variation of area elevation in each track from 1 m up to 30 m. magnetic anomaly from this program is compared to magpick result showed that the magnetic anomaly curve on each line have good suitability with the accuracy 0,93%. Therefore, the continuation program become the alternative in magnetic data processing.

Download Full-text