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Yossa Yonathan Hutajulu
Universitas Palangka Raya, Kalimantan Tengah, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Public Health Social Sciences Other

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Evaluasi Kesesuaian Rencana Penambangan Dengan Realisasi di Tambang Ks-1 PT. ABC Kabupaten Barito Utara Provinsi Kalimantan Tengah Ni Putu Ayu Indyastika; I Putu Putrawiyanta; Yunida Iashania; Yosa Yonathan Hutajulu; Saptawartono Saptawartono
Jurnal Ilmiah Teknik Informatika dan Komunikasi Vol. 5 No. 3 (2025): November: Jurnal Ilmiah Teknik Informatika dan Komunikasi 
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juitik.v5i3.1645

Abstract

This study aims to evaluate the level of conformity between the mining plan and its actual implementation in Pit Ks-1 of PT. ABC during the period of April 2025. The evaluation was conducted to determine the level of production achievement and to identify the factors causing discrepancies between the planned design and the actual field conditions. The research employed a descriptive-quantitative method, utilizing mine planning software to analyze and compare the planned mining sequence with the actual progress in the field. The analysis focused on the conformity between the planned mining sequence and the actual pit conditions, as well as the achievement of production targets. The results show that the actual overburden removal reached 872,819 bcm or 89% of the target of 981,990 bcm, while coal production reached 38,130 tons or 54% of the target of 70,000 tons. Based on the evaluation of the mining sequence conformity, the study area was dominated by undercut conditions (insufficient excavation), with a smaller portion of overcut (excess excavation), and several areas that were in plan (aligned with the design). The main factor contributing to the discrepancy between the plan and the actual mining realization was environmental conditions, particularly the high rainfall intensity during the study period. The total rainfall hours exceeded the planned working schedule, resulting in reduced Effective Working Hours (EWH). This condition caused slippery haul roads and flooded pit fronts, which hindered equipment movement and lowered operational productivity.
ANALISIS PENGARUH CURAH HUJAN TERHADAP AKTUAL OVERBURDEN REMOVAL: ANALYSIS OF THE EFFECT OF RAINFALL ON ACTUAL OVERBURDEN REMOVAL Noveriady; Djanas Usup, Hepryandi L.; Yonathan Hutajulu, Yossa
JURNAL TEKNIK PERTAMBANGAN Vol. 24 No. 1 (2024): Februari 2024
Publisher : JURUSAN TEKNIK PERTAMBANGAN UPR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jtp.v24i1.12436

Abstract

Pengaruh curah hujan terhadap berbagai aktivitas khususnya kegiatan penambangan memberikan dampak terhadap tergenangnya front penambangan. Penelitian ini berfokus pada melihat pengaruh dari faktor cuaca, dalam hal ini adalah curah hujan dan aktual overburden removal.  Sehingga akan didapatkan   bagaimana   pengaruh   dari   curah hujan terhadap aktual overburden removal. Metode analisis statistik menggunakan regresi linier sederhana dan uji-t. Penggunaan metode regresi linier sederhana menunjukkan curah hujan dan aktual overburden removal tidak kuat atau aktual overburden removal tidak dipengaruhi oleh curah hujan. Hal tersebut diperkuat dengan uji signifikan hipotesis (uji-t), bahwa, tidak ada pengaruh nyata (tidak berpengaruh signifikan) dengan taraf signifikan 5%. Kata kunci: curah hujan, overburden removal, analisis statistik
Slope Stability Analysis of the Mahakam Monthly Pit Highwall Design at PT Arta Bumi Sakti Insani BaraPerkasa Site East Kalimantan Muhammad Faisal Siddiq; Yossa Yonathan Hutajulu; Ferdinandus Ferdinandus; Nuansa Mare Apui Ganang; Yusias Andri
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.8031

Abstract

PT Arta Bumi Sakti operates within the mining sector, focusing on the Insani Baraperkasa. A major challenge in open-pit mining in this area is maintaining the stability of highwall slopes, particularly in the 2025 Mahakam monthly pit design. This study aims to evaluate slope stability in the highwall region using the Limit Equilibrium Method through the Bishop Simplified, Janbu Simplified, Morgenstern Price, and Spencer. Geotechnical parameters were obtained from laboratory tests and interpretations of geotechnical drilling data, including unit weight, cohesion, internal friction angle, UCS, and GSI. Software was used to analyze the slope and calculate safety factors while considering groundwater levels, earthquake loads, and ground pressure across two representative cross-sections. The results show that both cross-sections have safety factor values exceeding the minimum threshold established by the Ministry of Energy and Mineral Resources Regulation No. 1827 K/30/MEM/2018, namely, FS > 1.1 and PoF < 20%. Thus, mining activities in this period can be conducted safely. In addition, the Spencer Method, which simultaneously satisfies stability in terms of force and momentum, provides stable results, this can be used as the basis that the Spencer can be used as the main method in the analysis of slope stability in the location.
Analisis Kesesuaian Realisasi di Lapangan terhadap Rencana Penambangan Bulan Maret 2025 di Pit P3BK4 PT Tama Raya provinsi Kalimantan timur Pasaribu, Aldo Radot Hamonangan; Hutajulu, Yossa Yonathan; Wiryanto, Yustinus Hendra; Noveriady, Noveriady; Usup, Hepryandi Luwyk Djanas
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 1 (2026): April: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i1.7443

Abstract

This study was conducted to evaluate the level of conformity between actual mining activities in March 2025 and the monthly sequence design plan at PT Tama Raya's P3000BK14 pit. The evaluation focused on geometric deviations, volume achievement, and changes in field conditions that influenced these discrepancies. The data used included the sequence design, actual topography from the TLS (Low-Scale Land Survey), and weekly production realizations. The results showed significant discrepancies between the planned and actual operations in weeks 2 and 4, primarily in the form of overcuts, undercuts, non-designed contour changes, thinning of the coal seam, and hydrological obstacles such as ponding and unstable drainage. The R2 sequence redesign in week 4 proved to improve the overburden excavation flow but did not fully restore coal access due to persistent geological and water conditions. These findings emphasize the need for more rapid topographic updates, more intensive water handling, and interdepartmental coordination to ensure better synchronization of plans and operations.
Efektifitas Metode Amalgamasi dan Metode Flotasi pada Proses Pengolahan Emas di Wilayah Pertambangan Rakyat (WPR) Yossa Hutajulu; Lisa Virgiyanti; Wisnu Rijati; Fahrul Indrajaya; Yustinus Hendra Wiryanto
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 2 (2026): Agustus: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i2.8669

Abstract

The amalgamation and flotation methods are widely used by miners because the methods are simple, fast and easy. The purpose of this study was aims to test the effectiveness of gold recovery using the amalgamation and flotation methods in conventional gold processing. The research methods used were observation and testing using the amalgamation and flotation methods in conventional gold processing. The effectiveness analysis was carried out by calculating the percentage of gold produced in the amalgamation and flotation processing methods. The test was carried out on 10 samples, each weighing 10 kg. The amalgamation process used a Hg solution, while flotation used a detergent reagent. The total primary gold processing using the amalgamation method was 11.46 grams, while the total primary gold recovery using the flotation method was 12.15 grams. The results of gold processing using the flotation method were higher than those using amalgamation because flotation can separate gold more efficiently from ore containing various impurity minerals. Meanwhile, the amalgamation method, which uses mercury, tends to be less effective and loses some of the gold because it only binds very fine and dispersed gold particles, while flotation can handle ore with lower gold content and larger gold particles.
Analisis Faktor-Faktor Penyebab Kontaminasi pada Stock Rom di PT Tri Oetama Pesada Michael Kentaro Lendrawan; Deddy Nan Setya Putra Tanggara; Yos David Inso; Yossa Yonathan Hutajulu; Ferra Murati
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 5 No. 2 (2026): Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v5i2.5295

Abstract

This study aims to analyze coal stockpiling management in the Stock ROM area to minimize contaminants at PT Tri Oetama Persada, Batapah Village, Timpah District, Kapuas Regency, Central Kalimantan. Coal contamination is a significant issue caused by suboptimal mining, hauling, and stockpiling processes, which may reduce coal quality. This research uses a descriptive quantitative method through field observations, documentation, and analysis of primary and secondary company data. The analysis focuses on stockpiling patterns, management systems, contamination factors, and field implementation. The results indicate that the Stock ROM applies the Chevcon stockpiling pattern with a FIFO (First In First Out) system. However, several problems were identified, including ineffective FIFO implementation, excessive coal pile height, and limited supervision during stacking and reclaiming activities. Contamination factors include poor ROM base conditions, water accumulation, foreign material contamination, and inadequate cleaning and recovery processes. Minimizing efforts include improving FIFO supervision, optimizing Stock ROM design and maintenance, separating materials during stockpiling, and conducting routine temperature and cleanliness monitoring. Improved management practices are expected to maintain coal quality and reduce contamination risks.
Co-Authors Betrio L, Prayoga DAK. Wijaya Djanas Usup, Hepryandi L. F. Indrajaya Fahrul Indrajaya Ferdinandus Ferdinandus Ferdinandus, Ferdinandus Ferra Murati FF. Lakoy Fidayanti, Neny Hepryandi L. Dj. Usup I Dewa Made Prawindya Kumara I Putu Putrawiyanta Indrajaya, F. Inso, Y. D. Inso, Yos David Marlen Fince T. L. Melinda, Sena Michael Kentaro Lendrawan Muhammad Faisal Siddiq Neny Sukmawatie Ni Putu Ayu Indyastika Novalisae Noveriady Nuansa Mare Apui Ganang P. C. Ishudi Pasaribu, Aldo Radot Hamonangan Risgunadi, N. Saptawartono Saptawartono Sofi Miftah Alrasyid Sukmawatie, N. Taruna, Yulian Ulah, Hidayat Usup, Hepryandi Luwyk Djanas Virgiyanti, Lisa Wiryanto, Yustinus Hendra Wiryanto, Yustinus.H. Wisnu Rijati Y. Taruna Yunida Iashania Yusias Andri Yusias Andri Yustinus Hendra Wiryanto