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Ubaidillah, Aji Syailendra
Universitas Muhammadiyah Mataram
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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Geology, Rock Geochemistry and Ore Fluid Characteristics of the Brambang Copper-Gold Porphyry Prospect, Lombok Island, Indonesia. Arifudin Idrus; Aji Syailendra Ubaidillah; I Wayan Warmada; Syafruddin Maula
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.1.6145

Abstract

Brambang is one of the porphyry copper-gold prospects/deposits situated along eastern Sunda arc. This study is aimed to understand geological framework, alteration geochemistry and ore fluid characteristics of the prospect. Fieldworks and various laboratory analyses were performed including petrography, ore microscopy, rock geochemistry, chlorite chemistry and fluid inclusion microthermometry. The prospect is composed of andesitic tuff and diorite which are intruded by tonalite porphyries. Tonalite porphyries are interpreted as ore mineralisation-bearing intrusion. Various hydrothermal alterations are identified including potassic, phyllic, propylitic, advanced argillic and argillic types. Ore mineralisation is characterized by magnetite and copper sulfides such as bornite and chalcopyrite. Potassic alteration is typified by secondary biotite, and associated with ore mineralisation. Mass balance calculation indicates SiO2, Fe2O3, K2O, Cu and Au are added during potassic alteration process. Ore forming fluid is dominated by magmatic fluid at high temperature (450-600ºC) and high salinity (60-70 wt. % NaCl eq.). Hydrothermal fluid was diluted by meteoric water incursion at low-moderate temperature of 150-400ºC and salinity of 0.5-7 wt. % NaCl eq.
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 Adryan Fitrayudha Agus Kurniawan Agustini Ernawati Ahmad Zarkasi Ahmad Zarkasi Anggraeni, Juraedah Dwi Anwar Efendy Ari Ramadhan Hidayat Arifudin Idrus Artansyah, M. Tunso Sapta Azhari, Uraihan Cahya, Serdian Eska Dermawan, Iwan Erni Yustissiani Faesal, Andi Fariyadin, M. Ruslin Anwar, Indradi Wijatmiko, Adiman Hady Rasikhun Hafiz Hamdani Hakim, Muhammad Samsul Hamdani, Hafiz HENDRA GUNAWAN B11211055 Hermansyah, Wahyu Hidayat , Syamsul Hidayat, Ahmad Taufiq I Gde Dharma Atmaja I Wayan Warmada Ilham, Ahmad Imam Ananda Intan Novianti Isfanari Khatib Syarbini M. Sidik Melinda Dwi Erintina Muhammad Basir Muhammad Khalis Ilmi Muhammad Khalis Ilmi Munarfan, ZA Nura Safitri Nurul Hidayati Pascanawati, Maya Saridewi Puteri Samengasbumi, Ringgi Putra, Lalu Lunk Ryanata putri, amanda Rajabi Mubarak Ramadhan Hidayat, Ari Ricky Ardiansyah Rukayah Rukayah Rukayah Rukayah Samengasbumi, Ringgi Puteri Sismanto Sismanto Sukuryadi Sukuryadi, Sukuryadi Susanto, Dira Suwahip Suwahip Swahip Swahip, Swahip Syafruddin Maula Syafruddin Maula Syamsul Hidayat SYAMSUL HIDAYAT Syarbini, Khatib Titik Wahyuningsih Toyyib, Mukhtar Za Munarfan Putra