Identification of Gold Mineralization Zones Using Magnetic Data at Gunung Gupit Area, Magelang, Central Java

Abstract

Indonesia is one of the biggest gold producing countries in the world. the discovery of new gold reserves makes the passion of the gold mining industry increase. The Gunung Gupit area of Magelang Regency in Central Java has discovered new gold potential, but has not been thoroughly explored. The magnetic method is applied to identify and determine the distribution of the presence of gold mineralized zones based on the magnetic properties of rocks. A total of 1001 points on 41 magnetic line were acquired using Proton Precession Magnetometer (PPM) Geometrics model G-856 in an area of 2.5 km2. Field data is obtained as Magnetic Field Anomaly. Reduction to pole (RTP) and low-pass filter process is applied to the magnetic anomaly. The results showed the Gunung Gupit area was divided into 4 zones based on magnetic anomaly responses, i.e strong, medium, weak anomaly and igneous rock zones. The 2.5 D modeling result shows the presence of northwest-southeast normal fault and strike slip fault that is perpendicular to the normal fault. These faults control the hydrothermal alteration in Gunung Gupit and its surroundings. A strong mineralization zone lies between these two faults. The presence of gold and other metal minerals lies in this strong mineralization zone, and moderate alteration. The coverage area is quite wide and distributed along the two faults.

Characterization of typological rocks using the geomagnetic method for mapping geological disaster susceptibility areas in Malang Regency, Indonesia

“…This method produces a repeating grid that aims to re ne the grid that passes through the data. The TMI map obtained is a dipole magnetic anomaly, so reducing to pole (RTP) is necessary (Yatini et al, 2021). Reduction to the poles is carried out to turn the dipole into a monopole by making the inclination angle 90° and 0° declination so that it can cause a magnetic anomaly to point to the object immediately below (Subasinghe et al, 2014).…”

Metallic-Mineral Prospecting Using Integrated Geophysical and Geochemical Techniques: A Case Study from the Bela Ophiolitic Complex, Baluchistan, Pakistan

“…The magnetic signature of the rocks was used to detect underlying geological features and economic deposits, with a total of 2000 geomagnetic sites covering a 25 km 2 area as presented in Figure 1 below. The proton precession magnetometer G-856 of Geometrics, USA, was used to conduct the magnetic survey, widely used for mineral exploration and subsurface mapping [28][29][30]. To eliminate the diurnal impact during the field survey, the base station was carefully selected by fixing one magnetometer, where the magnetic strengths were measured at a steady position.…”