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All Journal Jurnal Ilmiah Giga Journal of Geoscience, Engineering, Environment, and Technology
Dermawan, Iwan
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Earth & Planetary Sciences Education Engineering Environmental Science Physics

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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.
Co-Authors Anggraeni, Juraedah Dwi Azhari, Uraihan Faesal, Andi Hakim, Muhammad Samsul HENDRA GUNAWAN B11211055 Hermansyah, Wahyu Khatib Syarbini Melinda Dwi Erintina Munarfan, ZA Sismanto Sismanto Syamsul Hidayat SYAMSUL HIDAYAT Syarbini, Khatib Ubaidillah, Aji Syailendra Za Munarfan Putra