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All Journal Jurnal Ilmiah Giga Journal of Geoscience, Engineering, Environment, and Technology KURVATEK
Hermansyah, Wahyu
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Physics Social Sciences

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KARAKTERISTIK MINERALISASI BIJIH EMAS PADA PROSPEK HARGOSARI, KECAMATAN TIRTOMOYO, KABUPATEN WONOGIRI, PROVINSI JAWA TENGAH Arifudin Idrus; Wahyu Hermansyah
KURVATEK Vol 6 No 1 (2021): April 2021
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v6i1.2125

Abstract

Tirtomoyo in Wonogiri district is known as an ore mineralization region, in which one of the prospects occurred is Hargosari. No previous studies on the ore characteristucs have been done. A set of study on Hargosari prospect is aimed to characterize gold mineralization covering some aspects such as mineralogy, textures, ore chemistry and ore forming condition. To achieve the objectives, some research methods were performed suh as mapping, sampling and laboratory analyses for selected samples on term of petrography, ore microscopy and ore chemistry. Oligo-Miocene andesitic lava from Panggang Formation is identified as host rock. Opening system of veins is of jogs type to form en-´echelon tension gash veins. Quartz veins are enveloped by argillic and propylitic alteration zones, in association with pyrite, chalcopyrite, sphalerite, galena, gold, silver, chrysocolla, covellite and hematite. The approximately 5 cm thick quartz veins exhibit massive, swarm, low angle veins and stockwork structures, which is characterized by normal banded, crustiform, comb and saccaroidal textures. The quartz veins contain high base metals of up to 5.45% Cu, 9.9% Pb and 12.85% Zn, with significant grade of gold and silver of up to 3.85 g/t Au dan 395 g/t Ag. From mineral assemblages, the veins might be formed at temperatures of about 250-300°C. On the basis of those mentioned characteristics, gold mineralization in Hargosari prospect is categorized into an intermediate sulfidation epithermal. Keywords: characteristics, gold, epithermal, Hargosari, Wonogiri.
Identifikasi Lapisan Akuifer Air Tanah menggunakan Metode Resistivitas di Dusun Puaringan, Desa Pelangan, Lombok Barat Erintina, Melinda Dwi; Sismanto, Sismanto; Ubaidillah, Aji Syailendra; Hidayat, Syamsul; Faesal, Andi; Munarfan, ZA; Hermansyah, Wahyu; Syarbini, Khatib; Dermawan, Iwan; Anggraeni, Juraedah Dwi; Gunawan, Hendra
Jurnal Ilmiah Giga Vol. 28 No. 1 (2025): Volume 28 Edisi 1 Tahun 2025
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v28i1.4241

Abstract

The aim of this study is to identify the groundwater aquifer layer using the resistivity method in Puaringan, Pelangan Village, West Lombok. The aquifer layer is a layer of rock that has the ability to store groundwater well. This layer also tends to have high porosity so that fluid/water is trapped in the layer. The resistivity method used is vertical electric sounding (VES). This method is effective in detecting the subsurface vertically. Data acquisition was carried out using two sounding points (S1 and S2). Sounding points S1 and S2 were processed using IP2WIN software to produce a picture of the subsurface rock layer. The results of the S1 point study showed that the groundwater aquifer layer was at a depth of 113-126 meters identified as a sandstone layer. The results of the S2 point study showed that the groundwater aquifer layer was at a depth of 105-198 meters identified as a sandstone layer.
Sensitivity Analysis of Phase 5 Batu Hijau Pit Walls Khatib Syarbini; Faesal, Andi; Za Munarfan Putra; Syamsul Hidayat; Hermansyah, Wahyu; Erintina, Melinda Dwi; Ubaidillah, Aji Syailendra; Dermawan, Iwan; Azhari, Uraihan; Hakim, Muhammad Samsul
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21571

Abstract

The Batu Hijau mine, an extensive copper-gold operation in West Sumbawa, Indonesia, employs an open-pit mining method and is characterized by its significant pit dimensions, with planned slope heights reaching up to 1000 meters. Given the scale of the operation, maintaining slope stability is critical, influenced by stress on the pit slopes, geological structures, mine geometry, and rock mass strength. This study investigates the impact of groundwater on slope stability, emphasizing the role of groundwater pressure in reducing shear strength and consequently affecting slope stability. A comprehensive sensitivity analysis was conducted to evaluate the influence of groundwater pressures on the stability of the Batu Hijau pit walls. This analysis utilized the SLIDE® software from Rocsience, incorporating Rock Mass Rating parameters derived from geotechnical drill hole logs and mapping data, which were integrated into a 3D block model using Minesight™. The analysis focused on two groundwater conditions: Water Surface and Pore Pressure Grid. Groundwater model conditions were based on piezometer data and a new groundwater conceptual model of the Batu Hijau pit walls. Results from sensitivity assessments shows that high pore pressure will decease the slope stability. This findings highlight the need to manage groundwater pressures within the pit walls to mitigate slope instability effectively,therefore, the safety of mining operational could be increased. This study provides valuable insights into groundwater pressure management and its implications for slope stability in large-scale open-pit mining operations.
The Karakteristik Mineralisasi dan Alterasi Transisi Porfiri-Epitermal pada Sistem Porfiri-Epitermal Prospek Onto, Dompu, Sumbawa, Indonesia: Karakteristik Mineralisasi dan Alterasi Transisi Porfiri-Epitermal pada Sistem Porfiri-Epitermal Prospek Onto, Dompu, Sumbawa, Indonesia Putra, Z A Munarfan; Hermansyah, Wahyu; Erintina, Melinda Dwi; Ubaidillah, Aji Syailendra; Syarbini, Khatib; Dermawan, Iwan; Farwati, Baiq Esti Mila; Irawan, Baiq Brilliant Vani; Faesal, Andi
Jurnal Ilmiah Giga Vol 28 No 2 (2025): Volume 28 Edisi 2 Tahun 2025
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v28i2.4293

Abstract

Penelitian ini mengkaji prospek onto di busur Sunda bagian timur, koridor magmatis Sunda–Banda yang prospektif terhadap endapan emas–tembaga porfiri dan epitermal, dengan tujuan mengkarakterisasi alterasi hidrotermal dan mineralisasi bijih untuk memahami hubungan sistem porfiri dan epitermal sulfidasi tinggi. Metode kualitatif meliputi studi lapangan, logging inti bor VHD039, VHD055, dan VHD086, serta analisis petrografi dan mikroskopi bijih. Hasil menunjukkan intrusi porfiri Onto mengalami tumpang-tindih alterasi argilik lanjut akibat fluida epitermal sulfidasi tinggi, dengan zonasi vertikal dari bawah ke atas berupa kuarsa–piropilit ± diaspor, kuarsa–alunit–piropilit, kuarsa vuggy residual, kuarsa–alunit, kuarsa–dikit, kuarsa–kaolinit, hingga ilit–smektit, serta dominasi mineral alterasi temperatur tinggi seperti kuarsa–alunit dan kuarsa–alunit–piropilit ± diaspor. Mineralisasi tembaga–emas didominasi kovelit–pirit yang berasosiasi dengan alterasi kuarsa–alunit pada kedalaman ±300 m, berkembang sebagai diseminasi, pengisi urat kuarsa tipe A–B, dan inklusi dalam pirit, dengan tekstur vuggy terisi kovelit, pirit, dan sulfur alami; secara keseluruhan, alterasi argilik lanjut yang intens dan dominasi kovelit–pirit–sulfur mengindikasikan Prospek Onto sebagai sistem porfiri terawetkan yang tertumpang-tindih oleh sistem epitermal sulfidasi tinggi (lithocap), mencerminkan lingkungan mineralisasi transisi yang kompleks.
Co-Authors Anggraeni, Juraedah Dwi Arifudin Idrus Azhari, Uraihan Dermawan, Iwan Faesal, Andi Farwati, Baiq Esti Mila Hakim, Muhammad Samsul HENDRA GUNAWAN B11211055 Irawan, Baiq Brilliant Vani Melinda Dwi Erintina Sismanto Sismanto Syamsul Hidayat SYAMSUL HIDAYAT Syarbini, Khatib Ubaidillah, Aji Syailendra ZA Munarfan Putra