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All Journal Buletin Sumber Daya Geologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Dzil Mulki Heditama
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Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Subsurface Modeling of High Sulfidation Epithermal Deposit Systems Based on Geomagnetic Data in the Tulungagung Area, East Java Marisa, Sari; Dzil Mulki Heditama; Agata Vanessa; Y, Yatini
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 1 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i1.907

Abstract

The presence of metallic minerals in vuggy silica in Tulungagung, East Java, is characteristic of the high sulfidation epithermal (HSE) deposit system. This research quantitatively analyzes the distribution and geometry of metal mineral deposits in the research area using geomagnetic methods. The research analyzes the alteration and mineralization zones of the HSE deposits and builds a subsurface model. The geomagnetic method aims to determine subsurface conditions based on the magnetic properties of rocks. This research was conducted as many as 417 points with a distance between points of 50 - 700 meters, randomly from a lot area of 95 km2. The results of the reduce-to-pole (RTP) map analysis show that the alteration and mineralization zones of the HSE are seen in low magnetic anomaly values due to dominant alteration and the presence of complex faults, so that destructive magnetite occurs. The results of wave spectrum analysis obtained an estimated regional depth of ± 539 meters, which was used for subsurface modeling. The model shows the environment and geometry of the HSE deposits. The presence of alteration and mineralization in the study area is at low susceptibility values < 2 x 10-3 SI, controlled by faults and permeable lithologies. Dacite intrusions with high susceptibility values > 15 x 10-3 SI are interpreted as host rocks carrying mineralization in the study area.
PENENTUAN ZONASI POTENSI MINERAL LOGAM DI DAIRI SUMATRA UTARA BERDASARKAN DATA GEOSAINS TERINTEGRASI: DETERMINATION OF THE POTENTIAL ZONING OF METALLIC MINERALS IN DAIRI NORTH SUMATRA BASED ON INTEGRATED GEOSCIENCE Nazirah Saina; Dzil Mulki Heditama; Iwan Nursahan; Prihadi Sumintadiredja
Buletin Sumber Daya Geologi Vol 20 No 2 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i2.527

Abstract

Based on previous investigations by PSDMBP The Dolok Pangkuruhan area in Dairi Regency is known to have prospects for gold and other metal minerals deposits. This study aims to analyze the characteristics of mineralization and alteration, as well as to determine the potential zones of metal minerals through the integration of geological, geochemical, and geophysical data. The analytical methods used in this study include petrography, mineragraphy, X-ray Diffraction (XRD), Portable Infrared Mineral Analyzer (PIMA), statistical geochemistry, and geoelectric methods, specifically Induced Polarization (IP) and Resistivity. The results show three main lithological formations: phyllite, metasedimentary sandstone, and tuff. The types of alteration identified in the study area include argillic (illite-halloysite-kaolinite), argillic-propylitic (illite-intchlorite), phyllic (quartz-pyrite-chlorite), and phyllic-silicified (quartz-muscovite-illite). Based on the integration of geological, geochemical, and geophysical data, the potential metal mineral zones were identified in the subsurface six lines, specifically at line 5 prospect zone (Zn-Pb-Ag) and line 8 prospect zone (Au-Pb). Each line exhibits high chargeability values (100-190 ms) and moderate to high resistivity values (100-31623 ohm.m). The element concentration with the highest value of Zn is (11000 ppm), Pb ranges from (2324-4753 ppm), Au concentrations range from (1525-3 ppm) and Ag concentrations are the smallest, ranging from (10-25 ppm).
IDENTIFIKASI SEBARAN MINERALISASI LOGAM SULFIDA MENGGUNAKAN METODE POLARISASI TERINDUKSI DAN MAGNETIK DI KABUPATEN DAIRI, SUMATERA UTARA: IDENTIFICATION OF METAL SULFIDE MINERALIZATION USING INDUCED POLARIZATION AND MAGNETIC METHODS IN DAIRI REGENCY, NORTH SUMATRA Farizan Qurunulbahri; Dzil Mulki Heditama; Hartaja M. Hatta Wicaksono
Buletin Sumber Daya Geologi Vol 20 No 3 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i3.510

Abstract

Sulfide ore exploration is a critical focus in mining as it is a primary source of various metals needed in industry. In Indonesia, the potential for sulfide mineral resources is significant, particularly due to the complex geological conditions that create an ideal environment for forming sulfide mineral deposits. Geophysical methods, such as geoelectrics (resistivity and Induced Polarization) and magnetic methods, have effectively evaluated the potential for sulfide mineralization beneath the surface. This study was conducted in Dairi Regency, North Sumatra, to explore the potential for sulfide mineralization, particularly related to gold and base metals commodities. The results show the characteristic anomaly responses of rocks containing ore deposits with varying resistivity, chargeability, and susceptibility values. The characteristics of rock anomaly responses containing ore deposits at the study site show resistivity values ranging from low to high (1 - 86910 Ωm), chargeability values ranging from moderate to high (110 - 611 msec), and susceptibility values ranging from moderate to high (-0.4 - 1 × 10-5 SI). There is a correlation between these values, where zones with medium to high chargeability are associated with low to medium resistivity and medium susceptibility, indicating sulfide mineralization zones in argillic alteration. Meanwhile, zones with medium to high chargeability are associated with medium to high resistivity and medium to high susceptibility, indicating sulfide mineralization zones in phyllic alteration. The distribution of mineral deposits tends to orient west-east, consistent with the trend direction of quartz veins.
Co-Authors Agata Vanessa Farizan Qurunulbahri Hartaja M. Hatta Wicaksono Iwan Nursahan Marisa, Sari Nazirah Saina Prihadi Sumintadiredja Y, Yatini