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All Journal Jurnal Ilmiah Giga Journal of Geoscience, Engineering, Environment, and Technology Abdi Masyarakat Jurnal Pengabdian Mandiri MINERAL Aksi Kita: Jurnal Pengabdian Kepada Masyarakat Indonesia Berdampak: Jurnal Pengabdian Kepada Masyarakat
Melinda Dwi Erintina
Universitas Muhammadiyah Mataram
Humanities Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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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.
Pengenalan dan Sosialisasi Potensi Hotspring Oi Pana di Hu’u, Kabupaten Dompu Sebagai Manifestasi Geologi Permukaan Putra, ZA Munarfan; Faesal, Andi; Ubaidillah, Aji Syailendra; Erintina, Melinda Dwi; Felisa, Maritsha Safa
Indonesia Berdampak: Jurnal Pengabdian kepada Masyarakat Vol. 2 No. 1 (2026): 2026
Publisher : Indo Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63822/p7y4f121

Abstract

Hu’u hot spring is a natural resource that emerges as a surface geological manifestation related to subsurface geothermal activity and has scientific and educational value for the local community. However, local community understanding of the geological processes, characteristics, and potential utilization of the hot spring remains limited, resulting in underutilization that is not yet knowledge-based or sustainable. This community service program aimed to introduce the potential of the Hu’u hot spring as a surface geological manifestation and to improve community awareness and understanding of its geological significance. The program was conducted using an educative and participatory approach, consisting of preparation, socialization and education, limited field observation, and qualitative evaluation. Educational activities were delivered through counseling sessions, interactive discussions, and simple visual media to explain basic geological concepts related to hot spring formation, while field observations were conducted directly at the hot spring site to identify observable surface manifestations. The results showed a measurable improvement in community understanding, indicated by increased participant ability to explain the origin of the hot spring, recognize key surface geological features, and articulate the importance of environmental preservation around the site. Participant engagement during discussions increased significantly, with more than two-thirds of attendees actively participating in question-and-answer sessions. The program also resulted in increased community awareness regarding the sustainable use of the hot spring as a local natural resource. Overall, this community service activity successfully enhanced geoscience literacy and provided a foundation for future community-based and sustainable utilization of the Hu’u hot spring.        
ANALISIS PROFIL NIKEL LATERIT DENGAN MENGGUNAKAN DATA BOR PADA BLOK X DI PT MULIA PACIFIC RESOURCES Sadam, Muh; Erintina, Melinda Dwi; Ubaidillah, Aji Syailendra; Hidayat, Syamsul; Faesal, Andi; Syarbini, Khatib; Dermawan, Iwan; Anggara, Taufik Muja
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.v28i2.4221

Abstract

Penelitian ini bertujuan untuk menganalisis profil laterit di lokasi penelitian, mengidentifikasi komposisi mineral pada setiap lapisan, serta menentukan jenis batuan berdasarkan analisis petrografi. Endapan nikel laterit terbentuk sebagai hasil pelapukan residu batuan ultramafik melalui proses pelindian dan pemerkayaan supergen. Proses ini dipengaruhi oleh morfologi, struktur geologi, dan fluktuasi muka air tanah yang mengontrol distribusi unsur dalam profil laterit. Pendekatan penelitian kuantitatif diterapkan melalui observasi lapangan, pengambilan sampel, dan analisis bijih. Data bor pada Blok X ini belum pernah dipublikasikan sebelumnya. Hasil pengeboran menunjukkan variasi profil laterit pada setiap titik bor. Analisis mineralogi menunjukkan bahwa lapisan limonit didominasi oleh goethite, hematit, dan mangan, sementara lapisan saprolit mengandung serpentin, goethite, piroksen, olivin, dan silika. Lapisan batuan dasar didominasi oleh piroksen, serpentin, olivin, dan silika. Analisis petrografi mengonfirmasi bahwa sampel batuan dari MS-1 hingga MS-3 menunjukkan karakteristik peridotit dengan dominasi mineral piroksen, serpentin, olivin, dan kuarsa. Hasil penelitian ini memberikan wawasan mengenai karakteristik profil laterit serta distribusi mineral di daerah penelitian, yang dapat menjadi dasar eksplorasi lebih lanjut terkait potensi endapan nikel laterit.
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; Faesal, Andi; Irawan, Baiq Brilliant Vani
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 pada Busur Sunda bagian timur, koridor prospektif pada sistem magmatisme Sunda–Banda yang kaya endapan emas–tembaga tipe porfiri dan epitermal, dengan tujuan mengkarakterisasi alterasi hidrotermal dan mineralisasi bijih melalui metode kualitatif mencakup studi lapangan, logging inti bor dari lubang VHD039, VHD055, dan VHD086, serta analisis petrografi dan mikroskopi bijih; hasil penelitian menunjukkan bahwa intrusi porfiri Onto mengalami tumpang-tindih argilik lanjut akibat pengaruh fluida epitermal sulfidasi tinggi, dengan urutan alterasi vertikal dari bawah ke atas meliputi kuarsa–piropilit ±diaspor, kuarsa–alunit–piropilit, kuarsa vuggy residual, kuarsa–alunit, kuarsa–dikit, kuarsa–kaolinit, dan ilit–smektit, sedangkan analisis petrografi memperlihatkan dominasi mineral alterasi temperatur tinggi seperti kuarsa–alunit dan kuarsa–alunit–piropilit ±diaspor; mineralisasi tembaga–emas didominasi oleh kovelit–pirit yang berasosiasi dengan alterasi kuarsa–alunit pada kedalaman ±300 meter, dan mineralisasi sulfida melimpah (kovelit–pirit) berkembang pada urat kuarsa tipe A–B di sistem porfiri, di mana kovelit muncul sebagai diseminasi halus, pengisi urat, maupun inklusi dalam pirit, serta proses pelindian mineral primer seperti feldspar dan plagioklas membentuk rongga vuggy yang kemudian terisi oleh kovelit–pirit–belerang alami; kehadiran alterasi argilik lanjut intens dan mineralisasi sulfida utama berupa kovelit–pirit–sulfur mengindikasikan bahwa Prospek Onto merupakan sistem porfiri yang terawetkan dan tertumpang-tindih oleh sistem epitermal sulfidasi tinggi (lithocap), mencerminkan lingkungan mineralisasi transisi yang kompleks
Co-Authors Agus Kurniawan Anggara, Taufik Muja Anggraeni, Juraedah Dwi Azhari, Uraihan Dermawan, Iwan Faesal, Andi Farwati, Baiq Esti Mila Felisa, Maritsha Safa Firmansyah, Acop Hakim, Muhammad Samsul HENDRA GUNAWAN B11211055 Heni Pujiastuti Hermansyah, Wahyu Hidayat , Syamsul Ilham, Ahmad Imam Ananda Irawan, Baiq Brilliant Vani Munarfan, ZA Rukayah Rukayah Rukayah Rukayah Sadam, Muh Sismanto Sismanto Susanto, Dira Syailendr, Aji Syamsul Hidayat SYAMSUL HIDAYAT Syarbini, Khatib Ubaidillah, Aji Syailendra