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All Journal Journal of Innovation and Applied Technology INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Mining Journal Jambura Geoscience Review Indonesian Physical Review Journal of Engineering and Scientific Research (JESR) Indonesian Applied Physics Letters Amerta Jurnal Geosaintek
Yatini, Y
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Religion Arts Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences

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MANGANESE (Mn) MINERAL DELINIATION AT THE “NAMASTE” FIELD BASED ON INDUCED POLARIATION (IP) METHOD Cahyaningtyas, Virnanda Eka; Yatini, Y
Jurnal Geosaintek Vol. 12 No. 2 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i2.1879

Abstract

Indonesia is one of the world's leading producers of manganese (Mn). Manganese is one of the essential elements required by humans and industry, making the exploration of manganese minerals crucial. This exploration often utilises geophysical methods. Research has been conducted on the “Namaste” field area located in Tulungagung Regency, East Java. The study aims to determine the presence and distribution of manganese minerals using the Induced Polarisation (IP) method, thereby enabling the identification of the lithology and the presence of manganese minerals in the study area. Measurements were made on 10 trajectories using a dipole-dipole configuration with a = 10 and a = 20 meters and n = 1-8. The measurement trajectory spans an area of 400 m x 400 m, with a length ranging from 100 to 260 meters. Data were processed using Res2DInv and other software such as Surfer, Oasis Montaj, CorelDraw, Rockwork, and Leapfrog. The results show the distribution of resistivity values in the range of (5-4500) Ohm-m and chargeability values of (1-295) msec. Low resistivity values, below 100 Ohm-m, are interpreted as indicating carbonate mudstone, while medium resistivity values (100-2000 Ohm-m) are interpreted as indicating limestone. High resistivity values >2500 Ohm-m are interpreted as intrusive igneous rocks. The presence of manganese minerals is spread at a depth of <27 meters with a high chargeability value of >100 msec. The distribution of manganese minerals is dominated in the central and northern areas of the study area.
Integration of Electrical Resistivity Tomography and Borehole Data for Mapping Laterite-Bedrock Boundaries in a Nickel Deposit, 'PHO' Block, Southeast Sulawesi Pahlawantika, Ipho Amanah; Yatini, Y; Wicaksono, Muhammad Arief
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 1 (2025): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i1.93950

Abstract

Indonesia has the largest nickel reserves in the world, so proper exploration is crucial to map the potential and utilization of this resource. Exploration of nickel laterite is carried out by mapping the boundaries of the laterite zone and bedrock as a prospect zone for further exploration. One of the methods used is Electrical Resistivity Tomography (ERT) combined with drill data. The principle of the ERT method involves injecting electric current into the ground to measure variations in subsurface resistivity. These variations in resistivity are then used to map the lithological distribution. ERT data, used as the primary data source to obtain an inversion model, is combined with inline borehole data, involving a total of 8 ERT lines and 23 borehole data points. The integration of both ERT and borehole data characterizes zones of nickel laterite and bedrock. Nickel laterite zones consist of saprolite and limonite lithology, and there is a saprock zone as a transition between the nickel laterite zone and the bedrock. Research in the "PHO" Block shows that resistivity values range from 10.9 Ωm to 1500 Ωm, divided into four main zones: saprolite (<150 Ωm), limonite (150 -700 Ωm), saprock (700 -1000 Ωm), and bedrock (>1000 Ωm). The nickel laterite zones are primarily composed of the saprolite with high Ni, high weathering, and porous zone, limonite zones with high FeO2 and low conductive material, and saprock zones that are transition zones of the nickel laterite with low weathering, high fracture, and bedrock. The boundary between the laterite zone and bedrock is predominantly found at depths ranging from 31.1 meters to over 49.9 meters, indicating the presence of bedrock. The limonite zones, which accumulate to more than 20 meters in thickness, are evenly distributed, with lower accumulations in the south and northeast. Thinner saprolite zones were found at depths exceeding 20 meters, while saprock and bedrock were detected starting from a depth of 13.4 meters and extending to over 49.9 meters. The integration of the ERT method and borehole data provides a clearer understanding of the lithologic distribution and the boundary between the laterite and bedrock zones.
Co-Authors Agus Santoso Asep, Sugianto Budi, Yudanto Setyo Cahyaningtyas, Virnanda Eka Getsimany, Chrismast Hamdallah, Hafiz Heidar, Ismail ira kusuma dewi Kustanto Putra , Abdurrohim Muhammad Arief Wicaksono Muhammad Azis Albar Muhlisin, Haris Nugraheni, Elleona Septi Nur Rohman, Hafid Rizki Pahlawantika, Ipho Amanah Seno Giamboro, Wrego Sepriyenra, Revaldo Sungkowo , Ari Surya Utama, Bonang