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Raivel Raivel
Universitas Sulawesi Tenggara
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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Analisis Perbandingan Kadar Mgo Dan Sio₂ Pada Endapan Nikel Laterit Di Daerah Boedingi, Sulawesi Tenggara Adriansyah Wuriadin Lantapi; Gina Audina P Alhabsyi; Raivel Raivel; Sara Septiana; Alwan Satapona; Winarno Winarno
Mining Science And Technology Journal Vol 5 No 1 (2026): Mining Science and Technology Journal
Publisher : Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Sulawesi Tenggara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54297/minetech-journal.v5i1.1463

Abstract

Sulawesi Tenggara merupakan salah satu wilayah prospektif pembentukan endapan nikel laterit yang berkembang pada batuan ultramafik dan mengalami proses lateritisasi intensif. Perbedaan kadar MgO dan SiO₂ menjadi parameter penting dalam menafsirkan karakter geokimia, tipe endapan, serta kualitas bijih nikel laterit. Penelitian ini bertujuan untuk menganalisis perbandingan kadar MgO dan SiO₂ pada endapan nikel laterit di Daerah Boedingi, Sulawesi Tenggara, khususnya pada Pit A dan Pit E. Metode yang digunakan adalah metode deskriptif-analitik melalui observasi geologi lapangan, identifikasi litologi, pengambilan sampel bijih laterit, preparasi sampel, serta analisis geokimia menggunakan instrumen X-Ray Fluorescence (XRF) Epsilon 4. Hasil penelitian menunjukkan bahwa Pit A memiliki kadar MgO sebesar 30,28% dan SiO₂ sebesar 40,29%, lebih tinggi dibandingkan Pit E yang memiliki kadar MgO sebesar 17,05% dan SiO₂ sebesar 36,33%. Perbedaan tersebut menunjukkan variasi karakter lateritisasi dan litologi batuan induk, dimana Pit A yang berasosiasi dengan litologi dunit cenderung memiliki karakter lebih magnesian dan siliceous, sedangkan Pit E yang berasosiasi dengan harzburgit menunjukkan kecenderungan lebih ferruginous dan aluminous. Berdasarkan karakter geokimianya, Pit A diinterpretasikan sebagai tipe endapan laterit oxide deposit, sedangkan Pit E lebih mencerminkan tipe hydrous silicate deposit. Dengan demikian, perbandingan kadar MgO dan SiO₂ dapat digunakan sebagai dasar dalam interpretasi karakter endapan, kualitas bijih, dan arahan kegiatan eksplorasi maupun penambangan nikel laterit secara lebih selektif.
Identifikasi Kedalaman Dan Ketebalan Lapisan Lunak Di Area Kantor Pengawasan Keuangan Dan Pembangunan Kabupaten Mamuju Menggunakan Metode Geolistrik Resistivitas Hasrianto Hasrianto; Raivel Raivel; Saddam Husein
Mining Science And Technology Journal Vol 5 No 1 (2026): Mining Science and Technology Journal
Publisher : Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Sulawesi Tenggara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54297/minetech-journal.v5i1.1457

Abstract

The Mamuju City area, West Sulawesi, was significantly impacted by the 2021 earthquake. Earthquake vibrations can be amplified if they pass through soft soil layers, potentially increasing building damage. The Mamuju City Financial and Development Supervision Office (PKP) area is a vital infrastructure that requires subsurface assessment. This study aims to identify the depth, thickness, and lateral distribution of soft layers below the surface of the Mamuju PKP Office Area. The method used is the Schlumberger configuration geoelectric resistivity with a single measurement path from the correlation of three geoelectric resistivity sounding points. Data processing was carried out with inversion software to produce a 2D subsurface resistivity model. The inversion results indicate the presence of three main layers: First Layer (Zone A): Has a resistivity of 4.09 - 64.5 Ωm with a thickness of between 5 and 36.7 meters. This layer is interpreted as weathered sandy reef limestone saturated with water through intergranular flow, with a soft/loose layer condition. This layer is the main soft layer that has the potential for amplification. Second Layer (Zone B): Has a resistivity of 0.02 – 4.09 Ωm with a thickness that varies between 11 to 22.4 meters. This layer is dominated by weathered material of sandy reef limestone or highly weathered rock. This layer is the main soft layer that has the potential for amplification. Third Layer (Zone C): Has a resistivity of 64.5 – 22048.1 Ωm. This layer is interpreted as a harder and more compact bedrock. The depth of this bedrock varies, starting from around 2 to 10.6 meters. This layer is a hard/compact layer. The conclusion is that the identified soft layer based on the resistivity geoelectric interpretation consists of 2 layer zones, namely the first layer (Zone A) and the second layer (Zone B) with a resistivity value of <64.5 Ωm, a layer thickness of 5 to 36.7 meters, a layer depth of 0 to 34.3 meters. The presence of this thick soft layer has the potential to become an earthquake amplification zone, so it needs to be taken into consideration in earthquake mitigation and engineering planning for rebuilding or retrofitting structures in the area.
Co-Authors Adriansyah Wuriadin Lantapi Alwan Satapona Gina Audina P Alhabsyi Hasrianto Saddam Husein Sara Septiana Winarno Winarno