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All Journal Journal of Earth and Marine Technology (JEMT) Journal of Civil Engineering and Technology Sciences Beujroh : Jurnal Pemberdayaan dan Pengabdian pada Masyarakat
Emanuel G. Manek
Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Jember
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Physics Social Sciences Transportation Other

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Determination Coal Mine Ultimate Pit Limit based on Kepmen ESDM No. 227.K/MB.01/MEM.B/2023 and PP 26 2022 Suparno, Fanteri Aji Dharma; Aminah, Siti; Haeruddin, Haeruddin; Lestari, Rina; Mulyani, Kurnia Dewi; Manek, Emanuel; Sulistyo Rini, Utari Retno
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7236

Abstract

Economic factors and variables from geological resource models affect ultimate pit limit (UPL). Coal selling price, overburden stripping cost, coal mining cost, and royalties are among the economic factors taken into account in UPL. PP 26 2022 and Kepmen 227.K/MB.01/MEM.B/2023 both control the benchmark coal selling price and royalties. It takes a lot of time to determine UPL utilizing the Lerchs Grossman (LG) algorithm. UPL optimization is now feasible by integrating mining modelling software's Structured Query Language (SQL). The goal of this study is to determine UPL by maximizing coal resources at the site using the help of SQL in LG algorithm, which can optimize pits efficiently, precisely, and economically while taking the most recent laws into account. The study investigates a coal mine in Sanga-sanga, East Kalimantan. The study entails examining data processing using secondary data that was gathered for the study. Using the break-even stripping ratio (BESR) analysis approach, mining limitations are chosen. The chosen incremental stripping ratio (ISR) of 12.88 is in close proximity to the $13.41/ton break-even stripping ratio (BESR). The grid OPT015 in the optimization grid contains the incremental stripping ratio (ISR) value and considered as the UPL for the coal mine.
Gambaran dan Perubahan Pemahaman Masyarakat terhadap Mitigasi Kekeringan melalui Edukasi Sumur Resapan Padang, Ostwald; Manek, Emanuel Grace; Sitepu, Dio Aldestra; Bachri, Rian Akmal; Triatmojo, Mohammad Afiandy; Aliansyah, Muhammad Yusuf
Beujroh : Jurnal Pemberdayaan dan Pengabdian pada Masyarakat Vol. 3 No. 2 (2025): Beujroh : Jurnal Pemberdayaan dan Pengabdian pada Masyarakat
Publisher : Yayasan Sagita Akademia Maju

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61579/beujroh.v3i2.486

Abstract

Drought is one of the hydrometeorological disasters that significantly affects water availability, the environment, and the socio-economic lives of communities. The low level of public understanding regarding the causes and mitigation strategies for drought presents a major challenge in building environmental resilience. This study aims to describe and measure changes in community understanding of drought mitigation following an educational intervention on rainwater infiltration wells (sumur resapan) as a practical technical solution. The method employed was a pretest–posttest design using a Likert-scale questionnaire administered to 50 respondents. The results show a significant improvement in all measured aspects, including understanding of drought causes, mitigation steps, daily water-saving practices, and technical knowledge of constructing infiltration wells. Prior to the intervention, most participants demonstrated low levels of knowledge; after the educational session, there was a marked shift toward moderate to high levels of understanding. This participatory-based education proved effective in fostering awareness, preparedness, and trust in drought mitigation efforts through the implementation of infiltration well technology. These findings suggest the importance of sustained educational programs to strengthen community adaptation to climate change and water scarcity.
Analisa Kestabilan Lereng Area High Wall di PT.X berdasarkan Faktor keamanan Manek, Emanuel; Nefia, Arica
Journal of Civil Engineering and Technology Sciences Vol. 4 No. 1 (2025): April: Journal of Civil Engineering and Technology Sciences
Publisher : Faculty Of Engineering University 17 August 1945 Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/qtng6x72

Abstract

Slope stability is a key concern in open-pit mining due to its impact on safety and operational efficiency. Mine X, located in Kalimantan Island, faces landslide risks on its high wall slopes. This study aims to model slope stability and determine safe and economical slope geometry. The analysis was performed using the Limit Equilibrium Method (Bishop Simplified), both analytically and numerically, through Slide 6.0 software by Rockscience Inc. Input data were obtained from five geotechnical investigation points provided by PT.X, including cohesion, internal friction angle, and saturated unit weight. Two lithologies were analyzed—claystone and sandstone—with slope height variations (5 m, 10 m, 15 m) and angles (26°, 45°, 51°, 59°), under dry and saturated conditions. Simulation results show that the factor of safety (SF) decreases with increasing slope height and angle, especially under saturated conditions. Sandstone demonstrates better stability than claystone. The recommended optimal slope geometry is 10 meters in height with a 59° angle, yielding a SF ≥ 1.25 and aligning with the PC-400 excavator's cutting capability. This study provides a technical reference for designing safe slopes that support mining productivity.
Co-Authors Aliansyah, Muhammad Yusuf Arica Nefia Bachri, Rian Akmal Fanteri Aji Dharma Suparno Haeruddin Haeruddin Kurnia Dewi Mulyani Padang, Ostwald Rina Lestari Sitepu, Dio Aldestra Siti Aminah Triatmojo, Mohammad Afiandy Utari Retno Sulistyo Rini