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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).
Co-Authors Agata Vanessa Iwan Nursahan Marisa, Sari Nazirah Saina Prihadi Sumintadiredja Y, Yatini