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Program Studi Teknik Geologi Lt. 2 Gedung Fakultas Matematika dan Ilmu Pengetahuan Alam Kampus Hijau Bumi Tridharma Universitas Halu Oleo, Anduonohu, Kendari, 93232
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OPHIOLITE : Jurnal Geologi Terapan
Published by Universitas Halu Oleo
ISSN : -     EISSN : 27154440     DOI : https://doi.org/10.56099/ophi.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
OPHIOLITE: Jurnal Geologi Terapan adalah terbitan berkala ilmiah yang dikelola dan diterbitkan oleh Program Studi Teknik Geologi Universitas Halu Oleo. Terbitan ini memuat artikel pada topik ilmu geologi maupun geologi terapan. Riset ilmu geologi mencakup riset sains kebumian di bidang geologi, geofisika, dan geokimia. Riset geologi terapan mencakup bidang geologi eksplorasi, geologi rekayasa, mitigasi bencana geologi, hidrogeologi, dan geologi lingkungan.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Teknik Geologi dan Geologi Teknik
Articles 6 Documents
 1 
Search results for , issue "Vol 7 No 1 (2025): APRIL 2025" : 6 Documents clear
Mineral Chemistry and The Stability Temperature of Nickel-Iron Sulfide from Kolaka Ultramafic Rocks, Southeast Sulawesi Rio Irhan Mais Cendra Jaya; Syahrul Syahrul; Masri Masri
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p1-6

Abstract

This study investigates nickel-iron sulfide mineral chemistry and stability from ultramafic rocks in the Kolaka region, Southeast Sulawesi, Indonesia. Sampling was conducted at two Kolaka ultramafic rock outcrop sites in Baula and Wolo sub-districts. The Kolaka Ultramafic Rocks, part of the Kolaka Ophiolite Complex, are primarily composed of lherzolite, harzburgite, olivine websterite, and serpentinites. Sulfide minerals, including pentlandite, pyrite, and chalcopyrite, were observed in these rocks, along with Ni-Fe-rich minerals interpreted as awaruite. Pentlandite, the dominant sulfide mineral, occurs within olivine and chromite replacements, mainly at their rims and serpentine veins. Eight polished sections of ultramafic rocks from both sites were analyzed using EDS SEM to determine the chemical composition of pentlandite. This analysis reveals a variable composition of Ni and Fe, with Ni-rich members more prevalent. Pentlandites from the Baula district have Fe contents of 18.22–27.34 wt%, Ni contents of 32.59–39.10 wt%, and Co contents of 1.24–2.76 wt%, while those from the Wolo district have significantly higher Ni (46.19–53.79 wt%) and Co (2.79–4.18 wt%) contents but lower Fe (8.50–15.18 wt%). Based on the ternary diagram, pentlandites show various formation temperatures (200 to above 600°C). They are separated into two stability groups: Baula’s pentlandite (Ni < 40%, Fe > 18%) with stability temperatures between 200 and 500°C, and Wolo’s Ni-rich pentlandite (Ni > 46%, Fe < 16%) with stability temperatures above 600°C. The formation of Ni-rich pentlandite is attributed to Ni-rich ultramafic rocks reacting with seawater at high temperatures, facilitating efficient Ni scavenging during serpentinization.
Estimasi Sumberdaya Endapan Nikel Laterit Menggunakan Metode IDW Pada Pit Rama PT. Tonia Mitra Sejahtera Kabupaten Bombana, Provinsi Sulawesi Tenggara Muhammad Yasser Arsy Akbar; Erwin Anshari; Muhammad Ilham Kadar
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p23-30

Abstract

PT. Tonia Mitra Sejahtera is a company engaged in the nickel laterite commodity mining industry with a production operation mining business permit area of approximately ± 5,891 Ha. Currently, the company plans to open a new mining block at Pit Rama with an area of ± 5 Ha. This study aims to determine the amount of resources contained in Pit Rama. This research method is a quantitative study that combines theory with data obtained in the field. The estimation method used is the Inverse Distance Weighted (IDW) method which is determined based on geological conditions and the results of basic statistical analysis that have been carried out with an average drill spacing of 25 meters. The results of the study obtained a total resource volume at Pit Rama of 655,352.56 m3 and has a tonnage of 991,796.88 tons with an average nickel content of 1.74%.
Analisis Kemampugaruan dan Kemampugalian Batuan Peridotit Kabupaten Morowali Utara, Provinsi Sulawesi Tengah Amritzal Nur Firdaus; Isman Saleh; Iswandi Utama
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p43-48

Abstract

In lateritic nickel mining, peridotite rock serves not only as the primary source of nickel laterite but also plays a crucial role in slope design and the development of mining infrastructure, such as the construction of mine roads. Additionally, economically non-viable peridotite can be repurposed as fill material or construction raw material if it meets specific technical criteria. This study aims to analyze the ripperability and abrasiveness of peridotite rock in the research area to determine the most effective excavation method. The analysis was conducted using joint spacing data and rock strength obtained through measurements of rock mass discontinuities using the scanline survey, uniaxial compressive strength (UCS) tests, and point load tests. The findings indicate that the rock in the study area can be classified into three main categories based on joint spacing and strength: easy ripping, hard ripping, and very hard ripping. Based on the analysis, the recommended heavy equipment includes Bulldozer models D7G and D8K, which are suitable for the rock rippability categories identified at the site. Rocks with high strength values exhibit high abrasiveness, leading to accelerated wear on heavy machinery. Therefore, selecting wear-resistant equipment and implementing more intensive maintenance planning are essential to improving operational efficiency in the study area.
Analisis Geometri Lereng Tambang Terbuka Menggunakan Metode Bishop disederhanakan pada Area Pit ASK Kabupaten Konawe Utara, Sulawesi Tenggara Natasya Puteri Alquarima Ode; Laode Jonas Tugo; Asri Arifin
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p13-22

Abstract

The study area utilizes open-pit mining methods across all its mining pits and plans to develop a new pit to increase annual production. Slope stability analysis is crucial for designing both single slopes and overall slopes. This research aims to identify the actual profile conditions of laterite nickel and the material characteristics within the ASK pit area, as well as to determine the factor of safety (FoS) and the probability of slope failure (PoF). The study applies slope stability analysis using the limit equilibrium method-Bishop simplified based on Mohr-Coulomb failure criteria. The results indicate that the limonite zone has a wet unit weight of 23.85 kN/m³, cohesion of 31.74 kPa, and an internal friction angle of 30.76°, while the saprolite zone has a wet unit weight of 22.20 kN/m³, cohesion of 26.25 kPa, and an internal friction angle of 29.22°. Based on analysis results, a safe single slope geometry can be applied with a slope angle ranging from 50° to 70°, a height of 6 meters, and a bench width between 1 to 3 meters. For the overall slope geometry, applying a slope angle of 38° to 42° with a bench width of 3 meters, the calculated FoS and PoF values indicate that the proposed slope design is still safe to use, with FoS > 1.1 and PoF between 25%–50%, are above the required standard threshold values.
Kontrol Morfologi pada Profil Vertikal Endapan Nikel Laterit Pulau Kabaena bagian Selatan, Sulawesi Tenggara Jana Cindy Salinding; Masri Masri; Hasria Hasria; Ujang Sugiarno
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p31-42

Abstract

The southern part of Kabaena Island in Southeast Sulawesi lies within the East Sulawesi Ophiolite Belt and hosts abundant potential for lateritic nickel deposits; yet morphological controls on the thickness and distribution of nickel grades remain poorly understood. This study analyses how variations in topography influence lateritic nickel deposits, focusing on laterite thickness and nickel grade, using morphometric and morphography data derived from a digital elevation model (DEM) and geochemical data from 78 exploration drill holes. Besides examining cross sections, we assessed the distribution of laterite thickness and nickel grade by slope angle and elevation through linear regression. Lateritic nickel profiles can be classified by slope classes (gentle, moderately steep, steep), each showing distinct profile forms and nickel enrichment zones. The results indicate a positive correlation between elevation and laterite thickness (R = 0.52), whereas nickel grade shows a negative trend, decreasing at higher elevations (R = –0.56). In contrast, slope exhibits weak correlations with both laterite thickness (R = 0.20) and nickel grade (R = 0.14), suggesting slope variation does not significantly influence either parameter relative to elevation. On gentle slopes, average nickel grades are relatively higher than on steep and moderately steep slopes, with laterite thickness varying. The observation that laterite profiles differ at similar elevations and slopes implies that other geological factors also influence the distribution of lateritic nickel.
Estimasi Sumberdaya Nikel Laterit dengan Menggunakan Metode Krigging di PT. Gerbang Multi Sejahtera Al Amin Siharis; Hadi Zulkarnain Ladianto
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 1 (2025): APRIL 2025
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i1.p7-12

Abstract

This study was conducted to estimate laterite nickel resources using a spatial approach to determine the three-dimensional model of deposit distribution within the working area of PT. Gerbang Multi Sejahtera, located in South Konawe Regency, Southeast Sulawesi. The estimation was carried out using the Kriging method. The results show that the limonite zone contains approximately 3,391,000 tons of resources with an average nickel grade of 1.1%, while the saprolite zone contains around 4,213,500 tons with an average grade of 1.51%. The three-dimensional modeling was performed using a block size of 12.5 x 12.5 x 1 meters, which provides a more accurate representation of the spatial distribution of the deposits. This study is expected to contribute to mine planning and support decision-making for further exploration.

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