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Albertus Juvensius Pontus
Universitas Mulawarman
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Penentuan kedalaman zona degradasi pada lereng highwall di PT putra karya borneo Natasya Amanda Putri; Tommy Trides; Revia Oktaviani; Albertus Juvensius Pontus; Rety Winonazada
Journal Transformation of Mandalika, e-ISSN: 2745-5882, p-ISSN: 2962-2956 Vol. 7 No. 5 (2026): Mei
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/jtm.v7i5.6331

Abstract

lope stability in open-pit mining is a critical aspect influenced by the geotechnical conditions of slope-forming materials, particularly the presence of a degradation zone. This study aims to determine the depth of the degradation zone or Fully Disturbed Limit (FDL) and to analyze its role in the stability of the highwall slope at Pit North, PT Karya Putra Borneo. The research employs a quantitative approach using secondary data, including slope geometry and geotechnical parameters, combined with slope modeling using Slide 6.0 software. The depth of the degradation zone is determined based on a disturbance factor (D) value of 0.7, representing mechanical excavation methods. The results indicate that the degradation zone extends to a depth of approximately 3.9 meters from the slope surface, forming a relatively weaker layer compared to the underlying material. This zone has the potential to act as a weak plane that controls slope failure mechanisms. Therefore, the depth and position of the degradation zone are key factors that must be considered in slope stability analysis to support safer and more effective slope design in open-pit mining.
Permodelan hidrogeologi kondisi natural pada daerah luyo kabupaten polewali mandar provinsi sulawesi barat Nur Aqsa Syahban Irwan; Shalaho Dina Devy; Albertus Juvensius Pontus; Revia Oktaviani; Agus Winarno
Journal Scientific of Mandalika (JSM) e-ISSN 2745-5955 | p-ISSN 2809-0543 Vol. 7 No. 5 (2026)
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/10.36312/vol7iss5pp741-752

Abstract

The Luyo area, Polewali Mandar Regency, West Sulawesi Province, has a high dependence on groundwater as the main source of water for domestic and community activities. Increasing groundwater utilization may potentially disturb the natural hydrogeological balance if it is not properly managed. Therefore, a comprehensive understanding of natural hydrogeological conditions is essential as a basis for sustainable groundwater management. This study aims to determine the hydrogeological conditions of the study area, the natural groundwater balance, and the groundwater flow pattern and hydraulic head distribution through natural-condition hydrogeological modeling. The research methods include hydrological analysis, groundwater level measurements, electrical resistivity surveys using the Schlumberger configuration, pumping tests, and steady-state numerical groundwater modeling based on conceptual and mathematical approaches. The results indicate that the hydrogeological system in the study area consists of unconfined and semi-confined aquifers controlled by local lithological and geomorphological conditions. The natural groundwater balance shows that the study area remains in a relatively balanced condition, with groundwater recharge primarily derived from rainfall infiltration. Groundwater flow generally follows the topography, moving from recharge areas toward discharge zones such as rivers and springs. Model calibration results show good agreement between simulated and observed hydraulic heads. The developed natural-condition hydrogeological model is expected to serve as a baseline reference for evaluating future changes in the groundwater system due to human activities and environmental changes
Analisis Kinerja Alat Bor dalam Penyediaan Lubang Ledak untuk Mencapai Target Produksi Pembongkaran Overburden di Pit.7 PT. Insani Bara Perkasa Kabupaten Kutai Kertanegara Provinsi Kalimantan Timur Muh. Iskandar Rahman; Revia Oktaviani; Agus Winarno; Tommy Trides; Albertus Juvensius Pontus
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 2 (2026): Mei: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i2.1373

Abstract

Blast hole drilling is an initial stage that plays a critical role in determining the success of blasting activities in mining and construction operations. Drilling quality directly affects rock fragmentation, drilling equipment efficiency, drilling equipment productivity, as well as blasting safety and costs. This study aims to analyze the influence of drilling parameters on blast hole quality, including hole diameter, drilling depth, hole inclination, and the suitability of drilling patterns with respect to the planned blasting design. The research methodology involves field observations, actual measurements of drill holes, and analysis of data obtained from drilling and blasting productivity. The results show that deviations in hole depth and direction can lead to irregular distribution of blasting energy, resulting in suboptimal rock fragmentation and an increased potential for flyrock and overbreak. In addition, the selection of appropriate drilling methods and equipment based on rock mass characteristics has been proven to improve productivity and blast hole quality. Therefore, controlling drilling parameters and implementing proper operational procedures are essential to enhance the overall effectiveness and productivity of blasting activities. This study is expected to serve as a reference for the planning and evaluation of blast hole drilling activities to achieve more efficient, safe, and economical operations.
Studi Klasifikasi Tanah Metode USCS dan Pengaruh Kedalaman terhadap Karakteristik Tanah pada Lereng Lowwall Pit North PT Karya Putra Borneo Ahmad Akmal Muhyiddin; Tommy Trides; Shalaho Dina Devi; Revia Oktaviani; Albertus Juvensius Pontus
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 2 (2026): Mei: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i2.1374

Abstract

This study aims to determine the soil classification of rock disintegration products based on the Unified Soil Classification System (USCS) and analyze its relation to sample depth variations on the lowwall slope of Pit North, PT Karya Putra Borneo, Kutai Kartanegara Regency, East Kalimantan. Soil samples were obtained through the Slake Durability test, simulating rock weathering from wetting and drying cycles, producing fine particles classified as weathered soil. These samples were analyzed for physical properties using Atterberg Limits tests and Grain Size Analysis. Observation point coordinates were X 508523.011 m, Y 9922791.186 m, at an elevation of 87.548 m. Drilling indicated soil material at 0–1.5 m depth; claystone with coal fragments at 2.97–4.44 m; siltstone with coal fragments at 4.44–10.55 m; and claystone at 12.05–29.36 m. USCS classification showed the materials were dominated by fine-grained soils: clay (CL) and silt (ML), with minor silty sand (SM). Correlation with borehole depth revealed no significant changes in soil classification, indicating that depth variations primarily affect soil physical properties rather than its classification type.  
Estimasi Sumberdaya Batubara berdasarkan Data Ekplorasi Pengeboran dan Geophysical Logging pada Pt.Ansaf Job Site Pt.X Kalimantan Timur A. Agus Mantri; Windhu Nugroho; Albertus Juvensius Pontus; Shalaho Dina Devy; Koeshadi Sasmito
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 2 (2026): Mei: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i2.1384

Abstract

At the research location at PT. Ansaf Inti Resource, there are several mining stages such as exploration. In the exploration itself, drilling and logging activities are carried out. However, if not careful in calculating coal resource estimates, there can be potential discrepancies between the estimated coal resources based on the results of drilling data identification and well logging data with the actual results. Exploration activities are activities that are often carried out by companies to determine reserves in an area. Without carrying out these activities, companies will have difficulty estimating the profits to be obtained. To obtain the data needed to carry out exploration activities such as calculating the quality and quantity of coal, it is necessary to carry out drilling such as the full coring method and also carry out logging activities to complete the data and also as comparative data from core drilling. Coal Resources are part of a coal deposit in the form of a certain quantity and have reasonable prospects that allow for economic consideration. Coal resources are divided according to the level of geological confidence into inferred, indicated, and measured categories. Therefore, in this study, the author will calculate coal resources from exploration data collection such as coring data, cutting data, and well logging data as well as coal quality data and process it in Minescape 5.7 software so that it can obtain an estimate of coal resources for each seam at the research location.
Finite Element Analysis of Strength Degradation and Interface Behavior Controlling Bund Wall Stability in an Ex-Mining Pit Revia Oktaviani; Tommy Trides; Albertus Juvensius Pontus; Afdal Jamil Tanjung; Haviluddin Haviluddin
International Journal of Engineering, Science and Information Technology Vol 6, No 1 (2026)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v6i1.1786

Abstract

This study presents a finite element analysis of the stability and interface behavior of a bund wall constructed under tropical mining conditions at the Banda Mine, East Kalimantan, Indonesia. The research aims to evaluate the effects of strength degradation and geometric interfaces on the overall stability of the embankment system, which was designed to retain overburden material and mitigate slope failure under combined rainfall and seismic loading. The bund wall, with an overall height of 75 m and a base width of 130 m, was constructed using compacted sandy loam sourced from site overburden. Laboratory testing determined the geotechnical parameters of the materials, including soft clay, sandy loam, and siltstone foundation. Finite element modeling was performed on six critical cross sections to simulate progressive strength reduction representing 0%, 25%, and 50% cohesion loss. The calculated factors of safety ranged from 1.87 to 2.55 along the slope, 3.40 to 5.81 at the bund wall base, and 7.79 to 10.27 within the foundation, confirming overall structural stability under all modeled scenarios. However, local reductions in stability were observed near the interface zones and the central section of the wall at depths exceeding 25 m. These findings highlight the influence of interface geometry and strength degradation on stability performance and emphasize the need for improved compaction and continuous stress monitoring during operation
Analisis Pengaruh Kadar Air dan Porositas terhadap Kuat Tekan, Kuat Tarik, dan Kuat Geser pada Batupasir Formasi Balikpapan dan Pulau Balang, Kabupaten Kutai Kartanegara Weggie Atanasius Tonapa; Albertus Juvensius Pontus; Rety Winonazada; Tommy Trides; Ardhan Ismail
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 4 No. 3 (2026): Juni: Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v4i3.1392

Abstract

Compressive strength, tensile strength, and shear strength are the primary parameters used to evaluate the mechanical capacity of rocks to withstand loads, endure tension, and resist shear forces. The physical property variables believed to influence these mechanical properties are moisture content and porosity. Moisture content and porosity represent the percentage of water and the volume of pores or voids within the rock, expressed in percent (%). Therefore, this study aims to analyze the influence of moisture content and porosity on the mechanical strength of rocks, specifically compressive strength, tensile strength, and shear strength expressed through cohesion (c) and the internal friction angle (ϕ) in the sandstones of the Balikpapan and Pulau Balang Formations. This research employed laboratory testing of physical and mechanical properties on intact rock samples obtained from sandstone outcrops, which were subsequently processed using statistical analysis methods, including linear regression, the coefficient of determination (R2), and the correlation coefficient (r). The results indicate that variations in moisture content and porosity have a highly significant influence and are inversely proportional to the mechanical strength values of the rock. Specifically, higher moisture content and porosity lead to a decrease in the mechanical strength parameters (compressive, tensile, and shear strength) of the sandstones in both formations. This is evidenced by the negative linear trends and correlation/R2 values ranging from 0.96 to 1.
Analisis Upper Bound dan Lower Bound pada Kuat Tekan Batupasir Formasi Balikpapan dan Pulau Balang dengan Metode Uniaxial Compressive Strength, Point Load Index dan Schmidt Hammer Aisyatur Ridho; Tommy Trides; Rety Winonazada; Albertus Juvensius Pontus; Revia Oktaviani
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 4 No. 3 (2026): Juni: Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v4i3.1425

Abstract

Sandstone is one of the sedimentary rock types widely utilized in mining activities; therefore, its mechanical characteristics, particularly uniaxial compressive strength, need to be determined. This study aims to analyze the compressive strength of sandstone from the Balikpapan and Pulau Balang Formations using the Uniaxial Compressive Strength (UCS), Point Load Index (PLI), and Schmidt Hammer methods. Sampling and Schmidt Hammer testing were conducted in the field, while physical property tests, UCS tests, and PLI tests were carried out in the laboratory. The results indicate that the compressive strength of sandstone from the Pulau Balang Formation is higher than that of the Balikpapan Formation, with values ranging from 18.30–44.11 MPa and 10.05–39.51 MPa, respectively. The relationship between PLI and UCS for the Balikpapan Formation is expressed by the regression equation UCS = 16.569(Is50) with R² = 0.78, whereas for the Pulau Balang Formation the equation is UCS = 8.2664(Is50) with R² = 0.76. The regression equations were further complemented with upper and lower bounds based on the margin of error. In addition, the Rebound Number (Rn) exhibited a positive linear correlation with UCS, with coefficients of determination (R²) of 0.89 for the Balikpapan Formation and 0.98 for the Pulau Balang Formation. These findings indicate that higher UCS values correspond to higher Rebound Number values.            
Analisis Pengaruh Perubahan Suhu Batubara terhadap Nilai Total Moisture, Ash content, dan Nilai Kalori Batubara pada Area ROM Coal Stockpile di PT Mahakam Sumber Jaya Indaswati Indaswati; Windhu Nugroho; Albertus Juvensius Pontus; Agus Winarno; Ardhan Ismail
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 3 (2026): Agustus : Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i3.1438

Abstract

Coal stacked in stockpiles is directly exposed to sunlight and rain, which can significantly affect coal quality. These enviromental conditions influence the temperature of coal piles, subsequently causing fluctuations in moisture content. This stucdy investigates the effect of coal temperature on coal quality parameters at the ROM Coal Stockpile area of PT. Mahakam Sumber Jaya. Using actual field sampling methods with 30 samples collected form the ROM C HTS (High Total Sulphur) area during November – Desember 2024, coal temperature was measured using a thermogun and quality parameters total moisture, ash content and calorific value were analyzed using ASTM standard. Simple linear regression and correlation analysis were applied for data processing. Result showed that coal temperature has very stong negative correlation with total moisture (r = -0,89), a strong positive correlation with ash content (r = 0,59). The correlation between total moisture and calorific value was strong (r= -0,66). Temperature grouping into three ranges (30-50°C, 50-70°C, and 70-95°C) showed consistent trends: total moisture decreased by 2%, ash content increased by 1%, and calorific value increased by 66 kcal/kg as tempreture rose. These findings suggest that optimal coal tempreture maangement is essential to maintining coal quality during storage .
Evaluasi Trigger Action Response Plan (TARP) Pergerakan Lereng Disposal Menggunakan Alat Slope Stability Radar (SSR) Pada Disposal PT. Bara Tabang, Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur Irianta Ibo Sembiring; Tommy Trides; Windhu Nugroho; Revia Oktaviani; Albertus Juvensius Pontus
JURNAL TEKNOLOGI MINERAL FT UNMUL Vol 13, No 1 (2025): Jurnal Teknologi Mineral FT UNMUL Juni 2025
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jtm.v13i1.19258

Abstract

PT Bara Tabang merupakan salah satu perusahaan tambang batubara yang menggunakan alat Slope stability radar (SSR) sebagai alat monitoring lereng. SSR merupakan salah satu alat pemantauan lereng yang memiliki kelebihan dalam memantau keadaan lereng secara real time. SSR dapat menjadi alat yang sangat berguna dalam pengembangan dan penerapan Trigger Action Response Plan (TARP) untuk manajemen risiko. TARP merupakan sistem respon terstruktur yang mengatur langkah-langkah yang perlu diambil berdasarkan pemicu tertentu (trigger) yang terdeteksi di lapangan, guna mencegah kecelakaan dan kerugian. Penerapan SSR dalam menentukan TARP fokus pada identifikasi pemicu yang terkait dengan pergerakan lereng yang berbahaya. Oleh karena itu, penelitian ini bertujuan untuk mengetahui nilai ambang batas pada alarm dengan menggunakan metode Upper Control Limit (UCL) dan merekomendasikan nilai Trigger Action Response Plan (TARP). Hasil penelitian didapatkan nilai ambang batas pada VCP 1440, nilai rekomendasi alarm ialah 5.71 mm/jam dengan critical value sebesar 15.871 mm/jam dan berdasarkan nilai VCP 1440, tindakan yang diperlukan dapat disesuaikan terhadap status kestabilan lereng Disposal Pit Bara Tabang yang dikategorikan menjadi empat yaitu kondisi hijau – aman (< -1.48 mm/jam), kondisi kuning – awas (-1.48 – 4.28 mm/jam), kondisi oranye – kritis (4.28 -5.71) mm/jam, dan kondisi merah – longsor (>15.871 mm/jam).`
Co-Authors A. Agus Mantri Abdul Malik Afdal Jamil Tanjung Agus Winarno Agus Winarno Agus Winarno, Agus Ahmad Akmal Muhyiddin Aisyatur Ridho Akbar Ilham Akbar Nazaruddin Amarullah Amarullah Anakta Hartanta sebayang Anandyta Suci Ramdani Apriadi Saputra Ardhan Ismail Ardian Saputra Arie Prasetya Arie Arsuwendi Arsuwendi Dian Isnandar Dina Devy, Shalaho Djuwita Dela Safitri Eghi Eghi Elsa Amanda Putri Enggar Salsabilla Pramesty Ery Budiman Fajar Ramadhan Firman Firman Firman Firman Gunawan Manullang, Ronal Edi Harjuni Harjuni Hasan Harjuni Hasan Haviluddin Haviluddin Henny Magdalena Indaswati Indaswati Indra Ariani, Indra Irianta Ibo Sembiring Irvantoni Simbolon, Desron Jaba, Yafet Jawil, Anshar Abdullah Jhony Maxi Harjadi Koeshadi Sasmito L. Tobing, Ciko Gratio Parkletos Litha Respati, Lucia Lucia Litha Respati Lucia Litha Respati Masayu Widiastuti Melki Marten Mochamad Gaharu Dida Devedo Moh. Widzar Fahmi Widzar Muh. Iskandar Rahman Muhammad Rahul Shidiq Muhammad Rofy Fauzan Musodiq Musodiq Natasya Amanda Putri Nugroh, Windhu Nugroho, Windhu Nur Aqsa Syahban Irwan Nur, Al Maida Pranajiwa Putri Pebrian Putri, Agita Kendari Rafael Bonardy Gultom Rahmat Rahman Respati, Lucia Litha Rety Winonazada Rety Winonazada Revia Okatviani Revia Oktaviani Revia Oktaviani Revia Revia Oktaviani Rexy Maulana Riskianto, Achmad Riyan Pradika, Muhamad Roberto Firson Pappang Roland Fatar Fernados Sirait Ronald Alvin Ifnie, Jones Sakdillah Sakdillah Sakdillah Sakdillah Satria Bekti, Nanda Shalaho Dina Devi Shalaho Dina Devy Shalaho Dina Devy Shalizam, Shalizam Sitepu, Joe Vandame Sokisha, Sokkia Suhari, Josh Immanuel Stevano Thomas , Anita oktoviana L.P.G.M. Tommy Aria Pradana Tommy Trides Tommy Trides Tommy Trides Tommy Trides Trides, Tommy Vandrianus Felix Feto Nuwa Wahyu Garini, Andini Dwi Weggie Atanasius Tonapa William William William William windhu Nugroho Windhu Nugroho windhu Wiradhana, Ni Made Ayu Dwi Kartika Yolanda, Agnes Yuana Saputra