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Iwan Nursahan
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KARAKTERISITIK ENDAPAN POLIMETALIK EMAS DAN LOGAM DASAR DAERAH DOLOK PANGKURUHAN, KECAMATAN PEGAGAN HILIR, KABUPATEN DAIRI, PROVINSI SUMATERA UTARA: CHARACTERISTICS OF POLYMETALLIC GOLD AND BASE METAL DEPOSITS DOLOK PANGKURUHAN AREA, PEGAGAN HILIR DISTRICT, DAIRI REGENCY, NORTH SUMATRA PROVINCE Iwan Nursahan; Juan Aprilio Rafael L P; Prima M Hilman; Aton Patonah
Buletin Sumber Daya Geologi Vol 19 No 1 (2024): 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.v19i1.480

Abstract

Several previous investigative activities in the Dolok Pangkuruhan area, Dairi Regency, North Sumatra Province have discovered several locations of gold and base metal mineralization. This article discusses the characteristics of alteration and mineralization of gold and base metals based on the results of investigations in 2023 with the aim of determining the characteristics of alteration and mineralization as well as a deposit type model. The research methods used include semi-detailed geological mapping, alteration and mineralization, XRD analysis, spectral analysis, mineralography, and fluid inclusion analysis. The alteration that develops consists of: argillic, advanced argillic, phyllic-pyrite and phyllic-silicification. There are four types of mineralization: a. Au-galena veins (Dolok Pangkuruhan) which are characterized by the presence of native gold and crystalline and colloform vein textures; b. Galena mineralization, sphalerite (Aek Sulfi), with massive and banded texture characteristics; c. quartz-silicification-sphalerite-galena vein (Sembilin River); d. quartz-bornite-chalcopyrite vein (Sikiring- kiring River). The results of fluid inclusion analysis are interpreted as epithermal deposits with mineralization formation temperatures ranging from 240°C – 346°C. Based on paragenetic sequence analysis, the mineralization characteristics can be interpreted as a model of polymetallic deposits (Au-Pb and Zn-Pb-Cu) of medium - high sulphide epithermal vein type.
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).
KARAKTERISITIK ENDAPAN POLIMETALIK EMAS DAN LOGAM DASAR DAERAH DOLOK PANGKURUHAN, KECAMATAN PEGAGAN HILIR, KABUPATEN DAIRI, PROVINSI SUMATERA UTARA: CHARACTERISTICS OF POLYMETALLIC GOLD AND BASE METAL DEPOSITS DOLOK PANGKURUHAN AREA, PEGAGAN HILIR DISTRICT, DAIRI REGENCY, NORTH SUMATRA PROVINCE Iwan Nursahan; Juan Aprilio Rafael L P; Prima M Hilman; Aton Patonah
Buletin Sumber Daya Geologi Vol 19 No 1 (2024): 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.v19i1.480

Abstract

Several previous investigative activities in the Dolok Pangkuruhan area, Dairi Regency, North Sumatra Province have discovered several locations of gold and base metal mineralization. This article discusses the characteristics of alteration and mineralization of gold and base metals based on the results of investigations in 2023 with the aim of determining the characteristics of alteration and mineralization as well as a deposit type model. The research methods used include semi-detailed geological mapping, alteration and mineralization, XRD analysis, spectral analysis, mineralography, and fluid inclusion analysis. The alteration that develops consists of: argillic, advanced argillic, phyllic-pyrite and phyllic-silicification. There are four types of mineralization: a. Au-galena veins (Dolok Pangkuruhan) which are characterized by the presence of native gold and crystalline and colloform vein textures; b. Galena mineralization, sphalerite (Aek Sulfi), with massive and banded texture characteristics; c. quartz-silicification-sphalerite-galena vein (Sembilin River); d. quartz-bornite-chalcopyrite vein (Sikiring- kiring River). The results of fluid inclusion analysis are interpreted as epithermal deposits with mineralization formation temperatures ranging from 240°C – 346°C. Based on paragenetic sequence analysis, the mineralization characteristics can be interpreted as a model of polymetallic deposits (Au-Pb and Zn-Pb-Cu) of medium - high sulphide epithermal vein type.
Co-Authors Aton Patonah Dzil Mulki Heditama Juan Aprilio Rafael L P Nazirah Saina Prihadi Sumintadiredja Prima M Hilman