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All Journal Jurnal Ilmiah Giga Journal of Geoscience, Engineering, Environment, and Technology PROMINE JMM (Jurnal Masyarakat Mandiri) Jurnal Pengabdian Mandiri Aksi Kita: Jurnal Pengabdian Kepada Masyarakat Indonesia Berdampak: Jurnal Pengabdian Kepada Masyarakat
Faesal, Andi
Prodi D3 Teknik Pertambangan Universitas Muhamadiyah Mataram
Humanities Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Languange, Linguistic, Communication & Media Physics Social Sciences Other

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
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.
Geology, Structural Control and Hydrothermal Alteration of Porphyry Copper-Gold Deposits, Prospect Berambang, Sekotong District, West Lombok, West Nusa Tenggara, Indonesia Faesal, Andi; Erintina, Melinda Dwi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.21572

Abstract

Berambang, located in the Sekotong district of West Lombok, West Nusa Tenggara, Indonesia, is part of the eastern Sunda Arc, known for world-class gold mines. The area, situated within a province rich in copper-gold deposits such as the Batu Hijau and Hu'u deposits, is still in the early stages of promising exploration. This study aims to identify and understand the geological factors controlling alteration and mineralization in the Berambang deposit, based on geomorphological, stratigraphic, and structural analyses, supported by fieldwork and laboratory investigations, including petrographic analysis and X-ray diffraction (XRD). The stratigraphy of Berambang is divided into four rock units: dacitic volcanic rock, diatreme breccia, diorite intrusion, and alluvium. Geomorphologically, Berambang consists of three landform units: intrusive hills, volcanic hills, and alluvial plains. Hydrothermal alteration in the area is categorized into four types: argillic alteration (kaolinite-illite-smectite), advanced argillic alteration (alunite-andalusite), propylitic alteration (chlorite-calcite-quartz-epidote), and potassic alteration (biotite-silica-magnetite). Notably, potassic alteration, an indicator of porphyry deposits, has been identified, with hydrothermal fluid activity being controlled by two fault systems in Berambang, trending northeast-southwest and northwest-southeast.
Co-Authors Agus Kurniawan Anggara, Taufik Muja Anggraeni, Juraedah Dwi Arifudin Idrus Azhari, Uraihan Dermawan, Iwan Djoko Wintolo Farwati, Baiq Esti Mila Felisa, Maritsha Safa Firmansyah, Acop Florian Mayesti Prima Remba Makin Hakim, Muhammad Samsul HENDRA GUNAWAN B11211055 Heni Pujiastuti Hermansyah, Wahyu Hidayat , Syamsul Ilham, Ahmad Imam Ananda Irawan, Baiq Brilliant Vani Lukas Pardosi Melinda Dwi Erintina Munarfan, ZA Sadam, Muh Sismanto Sismanto Susanto, Dira Syamsul Hidayat SYAMSUL HIDAYAT Syarbini, Khatib tnunay, ite morina yostianti Ubaidillah, Aji Syailendra Welsiliana Wiguna, Gede Arya