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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

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

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

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.

Analisis Lebar Jalan Tambang Terhadap Produktivitas Hydraulic Shovel Liebherr R996 & Dump Truck Hitachi EH4500 di PT XYZ Rini, Utari Retno Sulistyo; Manek, Emanuel G.; Mulyani, Kurnia Dewi; Aminah, Siti
Jurnal Teknologi Sumberdaya Mineral Vol. 5 No. 2 (2024)
Publisher : Program Studi Teknik Pertambangan Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v5i2.53372

PT XYZ adalah perusahaan yang bergerak di bidang pertambangan batubara yang menerapkan sistem penambangan terbuka. Pengupasan lapisan tanah penutup batubara di Pit X PT XYZ dilakukan dengan alat muat hydraulic shovel Liebherr R996 sebanyak satu unit dan alat angkut dump truck Hitachi EH4500 sebanyak enam unit. Target pengupasan tanah penutup di Pit X adalah sebesar 2.100 BCM/jam. Saat ini produktivitas hydraulic shovel Liebherr R996 sebesar 1.970,385 BCM/jam dan untuk dump truck Hitachi EH4500 sebesar 1.450,77 BCM/jam. Saat ini target produktivitas belum tercapai karena adanya beberapa faktor di PT XYZ dan yang akan menjadi fokus penelitian ini pada faktor jalan angkut yang kurang lebar di beberapa titik. Upaya pencapaian produktivitas dapat dilakukan dengan cara pelebaran jalan angkut. Dari pengamatan lapangan waktu edar dump truck adalah 23,30 menit. Dengan simulasi perhitungan, pelebaran jalan dapat mengurangi waktu edar dump truck menjadi 21,30 menit dan produktivitas dump truck meningkat menjadi 1.703,03 BCM/jam. Namun, alternatif ini perlu digabungkan dengan beberapa alternatif tambahan dalam mencapai target yang signifikan di PT XYZ seperti meningkatkan nilai bucket factor shovel, peningkatan efisiensi kerja dan penambahan alat angkut. Sehingga pada akhirnya diharapkan adanya kelanjutan kajian terkait alternatif-alternatif tambahan tersebut sehingga PT XYZ dapat mencapai target yang diharapkan secara signifikan.

Non-Linear Lineament Density Impacts on Groundwater Infrastructure for Drought Resilience in Kulon Progo, Indonesia Susatio, Raja; Arrisaldi, Thema; Aprilia, Faridha; Manek, Emanuel Grace; Wilopo, Wahyu
Dinamika Teknik Sipil: Majalah Ilmiah Teknik Sipil Vol. 18/No. 2/Desember 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/dts.vi.13704

Drought poses a significant threat to water supply in regions like Kulon Progo, Indonesia. Seasonal water shortages lead to agricultural losses and increased disaster vulnerability. This study aims to improve groundwater exploration method for drought mitigation by analyzing the correlation between lineament density and groundwater using a dataset of 127 observations from Samigaluh and Kalibawang subdistricts using Pearson Correlation. The research uncovers a non-linear threshold at 4 km/km². Below the threshold, groundwater occurrence increases with density (r = 0.949), shows increasing infiltration. But above the threshold, occurrence decreases (r = -1.000), suggesting over-fracturing reduces storability. Maximum depths follow a similar pattern (r = 0.883 below, r = -1.000 above). These findings challenge conventional scoring methods in groundwater potential zoning, which often assume a linear positive relationship with lineament density. The study provides a novel framework for targeted exploration, prioritizing moderate-density zones to mitigate drought impacts and build resilience against climate-induced disasters.

Perancangan Desain Timbunan Batubara dan Pengaruhnya Terhadap Kestabilan Lereng di Sekitar ROM 4 Site DMP PT Cipta Kridatama Suparno, Fanteri Aji Dharma; Kusuma, Di Ajeng Arum; Haeruddin, Haeruddin; Aminah, Siti; Manek, Emanuel Grace; Rini, Utari Sulistyo; Mulyani, Kurnia Dewi
Jurnal Geosains dan Teknologi Vol 9, No 1 (2026)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.9.1.2026.36-47

Peningkatan produksi batubara di PT Cipta Kridatama site Dizamatra Powerindo memerlukan penambahan area Run of Mine (ROM) untuk menampung kelebihan produksi. ROM 4 sebagai area timbunan baru belum memiliki data teknis terkait daya dukung tanah, tinggi maksimum timbunan, dan kestabilan lereng. Penelitian ini bertujuan mengkaji kondisi geoteknik ROM 4 melalui uji berat volume batubara dan Dynamic Cone Penetrometer (DCP) untuk menentukan tinggi timbunan yang optimal. Analisis kestabilan lereng dilakukan menggunakan empat metode Limit Equilibrium Method (LEM): Bishop, Janbu, Morgenstern-Price, dan Spencer. Hasil penelitian menunjukkan desain optimal timbunan ROM 4 memiliki tinggi maksimum 17 meter, sudut lereng 36°, dan kapasitas 511.594,44 ton. Nilai faktor keamanan (FK) pada kondisi statis >1,3 dan dinamis >1,1. Metode Janbu menghasilkan nilai FK terkecil dibandingkan metode lainnya. Nilai FK setelah pembebanan menurun dibanding sebelum pembebanan akibat pengaruh beban tambahan terhadap kestabilan lereng. Secara keseluruhan, lereng ROM 4 dinyatakan aman dan sesuai dengan Keputusan Menteri ESDM No. 1827/K/30/MEM/2018.

Landslide Inventory and Relationship to Geological Conditions (Case Study: Trenggalek Regency, East Java Mulyani, Kurnia Dewi; Manurung, Joel Maruba; Rini, Utari Retno Sulistyo; Manek, Emanuel Grace; Suparno, Fanteri Aji Dharma
Jurnal Himasapta Vol 10, No 2 (2025): Jurnal Himasapta Volume 10 Nomor 2 Tahun 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jhs.v10i2.16249

Inventarisasi kejadian longsoran penting dilakukan sebagai upaya mitigasi kejadian longsoran dimasa depan. Lokasi yang sering terjadi longsoran mempunyai kerentanan untuk terjadi bencana longsoran. Penelitian ini bertujuan untuk memetakan kejadian longsoran terdahulu dan menganalisis hubungan antara lokasi longsoran dan kondisi geologi serta kemiringan lereng. Inventarisasi longsoran menggunakan foto-foto kejadian longsoran yang terdapat keterangan koordinat lokasi. Peta kemiringan lereng menggunakan penggabungan 7 data demnas. Peta geologi menggunakan penggabungan peta geologi lembar Madiun, Pacitan dan Tulungagung. Hasil analisis menunjukkan jumlah kejadian longsoran pada Kabupaten Trenggalek antara tahun 2024 dan Juni 2025 sebanyak 51 longsoran tersebar di Kecamatan Munjungan, Panggul, Tugu, Bendungan, Dongko, Suruh, Watulimo, Pule, Gandusari, dan Kampak. Jenis longsoran di lokasi penelitian adalah longsoran rotasional dan aliran debris dengan material longsoran berupa campuran tanah dan batuan yang merupakan hasil pelapukan tinggi dari batuan dasar yang sebagian besar berumur tersier. Longsoran paling banyak terjadi pada Formasi Mandalika dengan jumlah 36 kejadian. Lokasi longsoran sebanyak 34 longsoran berada pada lereng berbukit tersayat tajam/terjal dengan kemiringan 21% - 55%. 10 lokasi longsoran berada pada lereng berbukit bergelombang, 4 lokasi longsoran berada pada lereng bergelombang, dan 2 longsoran berada pada lereng miring landai. Kata-kata kunci: debris, inventarisasi, Mandalika, longsoran, Trenggalek ABSTRACTInventory landslide is essential to mitigate future landslide events. Locations that are prone to landslides are vulnerable to landslide disasters. This study aims to map previous landslide events and analyze the relationship between landslide locations, geological conditions, and slope gradients. The landslide inventory uses photographs of landslide events with location coordinates. The slope gradient map uses a combination of 7 national survey datasets. The geological map uses a combination of Madiun, Pacitan, and Tulungagung geological maps. The analysis results show that the number of landslide events in Trenggalek Regency between 2024 and June 2025 was 51 landslides spread across the districts of Munjungan, Panggul, Tugu, Bendungan, Dongko, Suruh, Watulimo, Pule, Gandusari, and Kampak. The landslides at the study site are rotational landslides and debris flows, with landslide material consisting of soil and rocks resulting from highly weathered bedrock, most of which is tertiary in age. The most landslides occurred in the Mandalika Formation, with 36 incidents. Thirty-four of the landslides were on steep, hilly slopes with gradients ranging from 21% to 55%. Ten of the landslides were on undulating hilly slopes, four on undulating slopes, and two on gently sloping slopes. Keywords: debris, inventory, Mandalika, landslide, Trenggalek

Analisis Lebar Jalan Tambang Terhadap Produktivitas Hydraulic Shovel Liebherr R996 & Dump Truck Hitachi EH4500 di PT XYZ Rini, Utari Retno Sulistyo; Manek, Emanuel G.; Mulyani, Kurnia Dewi; Aminah, Siti
Jurnal Teknologi Sumberdaya Mineral Vol. 5 No. 2 (2024)
Publisher : Program Studi Teknik Pertambangan Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v5i2.53372

PT XYZ adalah perusahaan yang bergerak di bidang pertambangan batubara yang menerapkan sistem penambangan terbuka. Pengupasan lapisan tanah penutup batubara di Pit X PT XYZ dilakukan dengan alat muat hydraulic shovel Liebherr R996 sebanyak satu unit dan alat angkut dump truck Hitachi EH4500 sebanyak enam unit. Target pengupasan tanah penutup di Pit X adalah sebesar 2.100 BCM/jam. Saat ini produktivitas hydraulic shovel Liebherr R996 sebesar 1.970,385 BCM/jam dan untuk dump truck Hitachi EH4500 sebesar 1.450,77 BCM/jam. Saat ini target produktivitas belum tercapai karena adanya beberapa faktor di PT XYZ dan yang akan menjadi fokus penelitian ini pada faktor jalan angkut yang kurang lebar di beberapa titik. Upaya pencapaian produktivitas dapat dilakukan dengan cara pelebaran jalan angkut. Dari pengamatan lapangan waktu edar dump truck adalah 23,30 menit. Dengan simulasi perhitungan, pelebaran jalan dapat mengurangi waktu edar dump truck menjadi 21,30 menit dan produktivitas dump truck meningkat menjadi 1.703,03 BCM/jam. Namun, alternatif ini perlu digabungkan dengan beberapa alternatif tambahan dalam mencapai target yang signifikan di PT XYZ seperti meningkatkan nilai bucket factor shovel, peningkatan efisiensi kerja dan penambahan alat angkut. Sehingga pada akhirnya diharapkan adanya kelanjutan kajian terkait alternatif-alternatif tambahan tersebut sehingga PT XYZ dapat mencapai target yang diharapkan secara signifikan.

Pengaruh Aktifitas Alat Berat dan Peledakan Terhadap Stabilitas Lereng Timbunan Tambang Batubara Suparno, Fanteri Aji Dharma; Aminah, Siti; Haeruddin, Haeruddin; Rini, Utari Retno Sulistyo; Mulyani, Kurnia Dewi; Manek, Emanuel Grace; Assyarbini, Muhammad Akbar
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 31, Nomor 2 (2025)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v31i2.69177

Open-pit mining generates voids backfilled with overburden, forming artificial slopes susceptible to landslides. Improper slope design and external factors such as heavy equipment loads, blasting vibrations, and groundwater may trigger instability. This study examines the stability of a disposal slope adjacent to the blasting zone at PT X Coal Mine in East Kalimantan, Indonesia. The research uses secondary data from PT X. including geotechnical parameters and operational details, Slope stability was evaluated via the Limit Equilibrium Method (Bishop and Morgenstern-Price) and Finite Element Method (FEM). Initial analyses revealed critical safety factors (FoS) of 0.853 (Bishop, Morgenstern-Price) and 0.520 (FEM), indicating high instability under combined dynamic and hydrogeological stresses. A slope redesign was proposed, improving FoS to 3.932 (dry) and 3.523 (wet) via Limit Equilibrium, and 1.570 (dry) and 1.370 (wet) via FEM. These value;s comply with the safety threshold (FoS ≥ 1.1) specified in KEPMEN ESDM No. 1827 K/30/MEM/2018, ensuring operational safety. The study underscores the necessity of integrating geotechnical and operational constraints in slope design to mitigate landslide risks in open-pit mining.

Studi Kematangan Batubara Formasi Warukin Berdasarkan Analisis Geokimia dan Reflectance Vitrinite di Barito Selatan, Kalimantan Tengah Nefia, Arica; Manek, Emanuel Grace
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1709

The Warukin Formation is one of the principal coal-bearing units within the Barito Basin, where coal quality and maturity are strongly influenced by local geological conditions and thermal history. This study aims to determine the coal maturity level of the Warukin Formation in South Barito, Central Kalimantan, through the integration of geochemical analyses and vitrinite reflectance measurements. The methods employed include proximate and ultimate analyses, as well as vitrinite reflectance (Ro) measurements on four coal seams (Seams A, B, C, and D). Proximate analysis results on a dry mineral matter free (dmmf) basis indicate fixed carbon values ranging from 52.41–56.07%, volatile matter from 43.93–47.59%, and calorific values between 11,003.64–11,500.54 cal/g. These parameters consistently classify all seams as Subbituminous A coal rank according to ASTM standards. Vitrinite reflectance measurements show average Ro values ranging from 0.37% to 0.61%, generally corresponding to the Subbituminous rank, with localized increases up to High Volatile Bituminous C in Seam A. These findings indicate that the coal of the Warukin Formation in the study area exhibits low to moderate maturity, with localized variations in thermal maturity. The integration of geochemical data and vitrinite reflectance analysis proves effective in evaluating coal maturity and provides an important basis for assessing coal quality and utilization potential within the Barito Basin.

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