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Analysis of the Effect of Rainwater Infiltration on Slope Stability Using the Limit Equilibrium Method at the Outpit Disposal, Serongga Site, PT Baramega Citra Mulia Persada Hulwani, Zati; Muhammad Hanif Khuzaifi; Nurul Aflah; Abrar Muslim; Yoessi Oktarini; Pocut Nurul Alam
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Slope stability in mining areas is a critical aspect that must be carefully considered, particularly in regions with high rainfall intensity. Heavy rainfall can increase the risk of slope failure, disrupt mining operations, and reduce planned production targets. This study investigates the effect of rainfall infiltration on slope stability at PT Baramega Citra Mulia Persada, Kotabaru, South Kalimantan, Indonesia. The Limit Equilibrium Method (LEM) using the Janbu method was applied to evaluate the Factor of Safety (FoS) under different moisture conditions and to assess the influence of rainfall infiltration on slope performance in the outpit disposal area. FoS calculations were conducted on four slope cross-sections, namely AA’, BB’, CC’, and DD’, based on geotechnical and rainfall data. The results indicate that each slope exhibits variations in FoS under different moisture conditions. Slope AA’ shows FoS values of 1.48 (saturated), 1.976 (partially saturated), and 2.007 (dry). Slope BB’ has FoS values of 1.311, 1.650, and 1.711, while slope CC’ exhibits FoS values of 1.516, 2.187, and 2.279. Slope DD’ represents the most critical condition, with the lowest FoS values of 1.106 (saturated), 1.374 (partially saturated), and 1.470 (dry). To improve stability, a geometric modification was applied to slope DD’ by adding an additional bench with a height of 4.3 m, which increased the FoS to 1.514 and satisfied the mine slope stability criteria.
Production Optimization Analysis Based on Effective Working Hour of Mobile Crusher Unit 02: Case Study in PT Mifa Bersaudara, West Aceh Oziana, Deea Rizki; Syafitri Amanda; Nurul Aflah; Pocut Nurul Alam; Nurul Kamal
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

PT Mifa Bersaudara is a coal mining company located in Meureubo, West Aceh, Indonesia. This study evaluates and optimizes the Effective Working Hours (EWH) of Mobile Crusher 02 (MC02), one of the key units in the coal crushing process. The primary constraint identified is the inability to achieve production targets due to excessive downtime, particularly standby time and equipment breakdowns, which significantly reduce operational efficiency. A quantitative descriptive approach was applied using primary field observations and secondary production data from May to June 2025. The analysis focused on downtime components, effective working hours, and equipment availability based on Mechanical Availability (MA), Physical Availability (PA), Utilization of Availability (UA), and Effective Utilization (EU). Results indicate that MC02 operated for an average of only 7 effective working hours out of 10.05 available hours, reflecting an efficiency level of 69.65%. Standby time accounted for the largest portion of downtime at 141.86 hours. Following the implementation of operational improvements aimed at reducing delays, overall efficiency increased, and production rose from 128,505 tons to 168,864 tons, achieving 112% of the targeted output. These findings demonstrate that improving EWH has a direct and significant impact on crusher productivity and provides a foundation for future operational optimization in the coal processing system.
DEVELOPING AN ANDROID PROTOTYPE APPLICATION TO PREDICT ROCK FRAGMENTATION FROM BLASTING IN SURFACE MINING Hendra Harisman; Nurul Aflah; Pocut Nurul Alam; M Muchlis; Febi Mutia
Jurnal Sains dan Teknologi Reaksi Vol 24, No 01 (2026): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v24i01.9313

Abstract

Blasting plays an important role in surface mining operations because it directly affects rock fragmentation, which is a key factor in optimizing mining performance. However, fragmentation prediction is commonly conducted using complex mathematical calculations on computers or laptops, making the process less practical and time-consuming. This study aims to develop an Android-based application to facilitate the prediction of blasting fragmentation results in a more efficient and accessible manner. The research employed a research and development (RD) methodology consisting of application design, development, and testing stages. The results show that the developed Android application can assist mining professionals in predicting rock fragmentation practically through smartphone devices. The application improves the efficiency and accessibility of fragmentation prediction and demonstrates the implementation of digital technology in mining practices within the Industry 4.0 era. Key words: blasting, surface mining, fragmentation prediction, mining optimization, digital technology.
Evaluasi Keberhasilan Revegetasi Lahan Reklamasi Tambang Menggunakan Data Sentinel-2 dengan Metode NDVI dan Pengamatan Lapangan di PT. Bara Energi Lestari, Kabupaten Nagan Raya, Provinsi Aceh Yoessi Oktarini; Rahman Hakim; Pocut Nurul Alam; Dewi Sartika; Yulianis
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1942

Abstract

Reclamation of former coal mining land is an obligation for mining companies to restore environmental conditions that have been disturbed due to mining activities. PT Bara Energi Lestari has carried reclamation and revegetation efforts in its former mining areas. The use of satellite imagery or remote sensing plays an important role in evaluating reclamation and revegetation activities. Satellite imagery greatly facilitates the evaluation process, particularly in analyzing land cover, improving time efficiency, and providing diverse visual data. Therefore, this study aims to evaluate the progress of revegetation in the reclamation areas of PT Bara Energi Lestari during the third reclamation period (2020–2024) and to assess the success of revegetation efforts through the analysis of the Normalized Difference Vegetation Index (NDVI). The study utilized NDVI data derived from Sentinel-2 imagery acquired from 2020 to 2024, which were spatially analyzed to examine changes in revegetation levels within the reclamation areas over the study period. The results of the analysis show that the revegetation efforts carried out in the reclamation areas of PT Bara Energi Lestari during the 2020–2024 period, which initially planned a reclamation area of 46.31 hectares, were ultimately realized on a reduced area of 43.91 hectares. Based on the analysis, the reclamation area from 2020 showed a vegetation cover of 98%, the 2021 area had 99%, the 2022 area had 89%, while the 2023 area dropped to 16%, and the 2024 area had only 9% vegetation cover.
Analysis of Groundwater Potential Using 1D Resistivity Method with Schlumberger Configuration to Address Water Scarcity in Meunasah Baro Village, Lhoknga District, Aceh Besar Pocut Nurul Alam; Nurul Aflah; Izzan Nur Aslam; Ramzi Adriman; Agus Hari Pramana; Muchlis; Hendra Harisman
PESARE: Jurnal Pengabdian Sains dan Rekayasa Vol. 4 No. 1: Februari 2026
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/pesare.v4i1.1177

Abstract

This community service activity focuses on identifying groundwater potential as an alternative solution to water scarcity in Meunasah Baro Village, Lhoknga District, Aceh Besar, Indonesia. The target beneficiaries were local residents who experience limited access to clean water, particularly during the dry season. The objective of this program was to provide scientific-based information on subsurface conditions to support sustainable water resource planning at the village level. A participatory and applied approach was implemented, involving local community members in site selection and field activities. The technical method used was a 1D resistivity geoelectrical survey with the Schlumberger configuration. Data were collected through field measurements and processed using inversion software to interpret subsurface lithology and groundwater characteristics. The results indicate that the subsurface layers are predominantly composed of silt and clay materials with low to moderate resistivity values. Although water-bearing layers were identified at depths of approximately 43 to 137.5 meters, the resistivity characteristics suggest that the groundwater is brackish. This condition is likely influenced by seawater intrusion due to the proximity of the study area to the coastline. No significant freshwater aquifer was identified.