Mount Pongkor is one of the areas in Indonesia with the largest gold mineralization potential in Java. One of the geophysical methods to identify the distribution of gold mineralization zones is the geomagnetic method that utilizes magnetic properties in the subsurface due to the influence of rock magnetization. Geomagnetic research has been conducted at Mount Pongkor, Bogor Regency, West Java with an area of 22 x 17 km as much as 793 magnetic satellite data from the National Oceanic and Atmospheric Administration (NOAA) website that has been corrected daily. This study aims to determine the distribution of alteration zones and mineralization of the study area. The results showed that the RTP map shows the distribution of magnetic anomalies ranging from -4.786 – 4.663 nT, with high anomalies in the north-south direction associated with mineralization zones with anomaly values ranging from 1.881 – 4.663 nT and low anomalies in the north-south direction associated with rock alteration zones with anomaly values ranging from -4,786 - (-2.174) nT. In the 3D inversion model, the alteration zone has an average depth of 350 - 2600 m from topography with susceptibility contrast values ranging from -0.35 - (- 0.25) SI and the mineralization zone has an average depth of 350 - 2800 m from topography with susceptibility contrast values of 0.25 - 0.35 SI.©2022 JNSMR UIN Walisongo. All rights reserved.
Indonesia is a country that's well known for its heritages. One of the heritages is Borobudur Temple. Several studies say that the Borobudur was enclosed by a lake. Therefore, this study aims to see the remains of an ancient lake below the surface with gravity method. The process stage begins with obtaining the CBA (Complete Bouger Anomaly) and continues by separating the anomaly with a Bandpass Filter, and followed with 3D inverse modeling and FHD (First Horizontal Derivative) analysis. According to the residual map, there are only minor anomalies in the west, south, and east, ranging in magnitude from -0.539 to (-0.209) mGal. This anomaly is consistent with the location of the ancient lake around Borobudur. In the meantime, the 3D modeling of the FHD study reveals a geologic structure surrounding the Borobudur with an anomaly ranging from 0.00289 to 0.00480 mGal. A deposit layer thought to be an ancient lake is visible between 50 and 525 meters in depth over the east and west sides of the Borobudur temple, and beneath it is visible between 250 and 525 meters. This depth map provides additional evidence that the ancient lake beneath the Borobudur is located between 250 and 525 meters.
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