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SILICIFIED COAL DAN IMPLIKASINYA TERHADAP PENAMBANGAN DI DAERAH ARAHAN, KABUPATEN LAHAT, SUMATERA SELATAN Rahmad Hidayatullah Rahmad Hidayatullah; Stevanus Nalendra Jati Stevanus Nalendra Jati
Jurnal Geomine Vol 6, No 3 (2018): Edisi Desember 2018
Publisher : Universitas Muslim Indonesia

Pada kegiatan penambangan, silicified coal sangat mempengaruhi kualitas batubara, selain kuantitas dari produksi batubara, kualitas juga menjadi tolak ukur keberhasilan dalam suatu proses penambangan. Salah satu tujuan dilakukannya penelitian ini adalah upaya untuk pengendalian kualitas batubara dengan cara mengurangi produksi yang melibatkan unsur pengotor salah satunya silicified coal. Daerah penelitian terletak di Desa Arahan, Kabupaten Lahat, Sumatera Selatan. Metode penelitian yang digunakan berupa studi literatur, pemetaan permukaan baik secara lateral maupun vertikal, analisis laboratorium berupa analisis petrografi dan XRD. Sampel diambil menggunakan teknik grab sampling dengan jumlah 10 sampel pada lokasi yang kemungkinan mewakili secara keseluruhan. Formasi pada daerah penelitian adalah Formasi Muaraenim yang terendapkan di lingkungan delta plain, Formasi Kasai yang tersedimentasikan di lingkungan darat. Silicified coal merupakan sisa tumbuhan yang membatu akibat penggantian komponen dengan silika. Mineral silika terbentuk dalam rekahan-rekahan, bukaan antar sel tumbuhan, dan pada cairan yang tertinggal dalam sel tumbuhan. Kenampakan fisik silicified coal pada lapisan batubara berupa layered dan lenses dan hampir sama seperti batubara berwarna hitam, tetapi memiliki nilai kekerasan yang lebih tinggi. Pada lapisan batubara daerah penelitian didominasi oleh silicified coal yang berbentuk lenses dengan tebal 10 - 40 cm. Pola sebaran silicified coal dikontrol oleh lapisan batubara. Dari hasil analisa XRD dan Petrografi silicified coal, ditemukan bahwa mineral yang mendominasi adalah mineral silika, sedikit karbon dan oksidabesi. Dari hasil observasi lapangan, pemetaan mengenai silicified coal pada lapidan batubara sangat penting dilakukan untuk menghindari penurunan kualitas produksi batubara.

Analisis Fondasi Disposal Tambang Terbuka PT Bara Anugrah Sejahtera, Muara Enim, Sumatera Selatan Wangga Sebayang; Stevanus Nalendra Jati
Jurnal Sumberdaya Bumi Berkelanjutan (SEMITAN) Vol 2, No 1 (2020): Prosiding
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/p.semitan.2020.981

Aktivitas tambang terbuka pada umumnya memerlukan sebuah tempat untuk membuang tanah penutup (overburden) yang dikenal sebagai disposal. Kestabilan suatu disposal tidak hanya dipengaruhi oleh material disposal tersebut, fondasi juga memiliki peran penting dalam kemantapan suatu disposal. Penelitian ini bertujuan untuk menganilisis kemantapan disposal PT Bara Anugrah Sejahtera. Metode yang digunakan dalam penelitian ini dengan menganalisis beberapa parameter yang dianggap berperan penting dalam kemantapan fondasi disposal, yaitu foundation slope, foundation shape, overburden type, undrained failure potential, groundwater, compactnessmaterial, dan groundwater. Data yang digunakan dalam penelitian ini menggunakan data pemboran geotek yang dilakukan pada lima titik. Dari hasil penelitian ini diketahui bahwa fondasi disposal pada daerah penelitian termasukdalam kategori cukup baik, hal tersebut dilihat dari bentukan lereng fondasi yang dominan cembung, sudut kemiringan fondasi yang cukup landai dengan rata-rata kemiringan 13,45°, tipe soil yang merupakan alluvial deposit, memiliki potensi rendah untuk terjadi undrained failure yang dilihat dari nilai konduktivitas hidrolik dan porositas material yang termasuk kategori moderate, kondisi fondasi tidak dalam kondisi jenuh (unsaturated), kekompakan material dense hingga very dense, dan bedrock yang cukup fresh serta tidak adanya struktur.

Analysis of Landslide Prone Areas in Tampahan, Toba Samosir Regency, North Sumatra Province Winda Lestari Turnip; Stevanus Nalendra Jati
Journal of Earth and Marine Technology (JEMT) Vol 1, No 1 (2020)
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.2020.v1i1.1149

The topography of the Tampahan area which tends to be steep and dominated by tuff lithology can result in a landslide. The intensity of landslides and the resulting losses can be reduced by the analysis of landslide-prone areas in Tampahan. The administration of the area is located in Toba Samosir Regency, North Sumatra Province which is included in the Toba Caldera Region. Analysis of landslide-prone areas is carried out with five parameters namely slope, land use, morphological elevation, lithology, and rainfall. The data processed in this analysis comes from field data, DEMNas (National Digital Elevation Model), and other spatial data. Classification of each parameter and weighting based on literature is away in the analysis of landslide-prone areas of Tampahan. Then do each parameter overlay to get the value of landslide-prone and distinguished based on the calculation of the landslide class interval. The results are divided into five classes that are prone to landslides, namely classes not prone (1-1,8), rather prone (1,8-2,6), quite prone (2,6-3,4), prone (3,4-4,2), and very prone (4,2-5). Based on the analysis that has been done, some areas are very prone to landslides in the southeast while areas that are not prone to landslides are in the southwest of the study area. Therefore, landslide-prone studies are categorized as high landslides with almost 60% coverage of the study area.

Identifikasi Kondisi Geologi dan Kualitas Airtanah di Desa Pelauw, Kecamatan Pulau Haruku, Kabupaten Maluku Tengah Kololu, Micky; Tuasikal, Hawa; Jati, Stevanus Nalendra; Puradimaja, Deny Juanda; Limehuwey, Resti; Ulfa, Yuniarti; Purwoarminta, Ananta
Journal of Science, Technology, and Visual Culture Vol. 4 No. 1 (2024): Juli 2024
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Pemenuhan kebutuhan air di Desa Pelauw sebagian besar bergantung pada air sungai dan airtanah. Namun ada sebagian masyarakat di Desa Pelauw kesulitan mendapatkan sumber air, sebab beberapa sumur gali memiliki sifat fisik payau. Oleh karena itu, penelitian ini bertujuan untuk mengidentifikasi kondisi geologi dan kualitas airtanah di Desa Pelauw, Kecamatan Pulau Haruku. Metode yang digunakan adalah interpretasi kondisi geologi, dan parameter fisik-kimia airtanah. Selanjutnya dilakukan klasifikasi nilai tiap parameter. Hasil penelitian menunjukkan bahwa Daerah penelitian di Desa Pelauw berada pada Satuan Endapan Aluvium (Qa), Batugamping Koral (Ql), dan Batuan Gunungapi Ambon (Tpav). Sistem hidrogeologi Desa Pelauw memiliki akuifer produktivitas sedang, akuifer produktivitas tinggi-sedang, dan akuifer produktif dengan pola aliran airtanah mengalir dari arah selatan ke utara dan intensitas curah hujan menengah. Kualitas air berdasarkan Permenkes No. 492 Tahun 2010 memiliki kondisi air tawar dengan nilai EC (138-1953 µs/cm), TDS (64-872 ppm), dan salinitas (0-2,84%), kondisi air payau dengan nilai EC (2072-2712 µs/cm), TDS (1.342-2.474 ppm), dan salinitas (4,04-5,42%), pH air layak minum dengan nilai 7,30-8,42 dan pH basa pada 8,63-8,56. Sampel airtanah pada pada daerah penelitian berasal dari adanya interaksi antara air dengan material penyusun akuifer.

Analisis Kesesuaian Lahan Kawasan Permukiman dan Pertanian Ubi Kayu Berdasarkan Aspek Geologi Lingkungan di Kecamatan Teluk Ambon Baguala Kololu, Micky; Jacob, Grace Christien Julian; Puradimaja, Deny Juanda; Limehuwey, Resti; Ulfa, Yuniarti; Jati, Stevanus Nalendra; Purwoarminta, Ananta
Journal of Science, Technology, and Visual Culture Vol. 4 No. 1 (2024): Juli 2024
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Luas lahan permukiman dan pertanian semakin mengecil seiring dengan laju pertumbuhan penduduk, namun ketersediaan lahan terbatas. Perencanaan yang baik diperlukan untuk menghindari alih fungsi lahan dan memaksimalkan potensi lahan. Kecamatan Teluk Ambon Baguala mengalami laju pertumbuhan penduduk sebesar 0,72% per tahun 2010 – 2020, memiliki perencanaan pengembangan kawasan permukiman dan pertanian ubi kayu, serta potensi sumber daya dan bencana geologi. Oleh karena itu, diperlukan analisis kesesuaian lahan untuk kawasan permukiman dan pertanian ubi kayu berdasarkan aspek geologi lingkungan pada daerah tersebut. Metode SMCE (Spatial Multi-Criteria Evaluation) digunakan untuk menganalisis kesesuaian lahan. Berdasarkan analisis SMCE, kawasan permukiman terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (8,6%), cukup sesuai (23,5%), sesuai marginal (23,9%), dan tidak sesuai (41,6%) dengan luas kelas lahan sesuai 1977,15 ha dan lahan tidak sesuai 1625,15 ha. Kawasan pertanian ubi kayu terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (7,3%), cukup sesuai (6,1%), sesuai marginal (25,3%), dan tidak sesuai (19,7%) dengan luas kelas lahan sesuai 827,51 ha dan lahan tidak sesuai 2774,79 ha. Berdasarkan analisis prioritas kawasan, maka luas kawasan permukiman 1894,53 ha dan kawasan pertanian ubi kayu 221,98 ha.

ASAL USUL FLUIDA MANIFESTASI PANAS BUMI DAN ESTIMASI TEMPERATUR RESERVOIR DENGAN PENDEKATAN ANALISIS ISOTOP PADA DAERAH DANAU RANAU, OGAN KOMERING ULU (OKU) SELATAN, SUMATERA SELATAN: ORIGIN OF GEOTHERMAL MANIFESTATION FLUID AND DETERMINATION OF RESERVOIR TEMPERATURE USING ISOTOPE ANALYSIS APPROACH IN THE LAKE RANAU AREA, SOUTH OGAN KOMERING ULU (OKU), SOUTH SUMATERA Ibrahim, Mochamad Malik; Harnani, Harnani; Jati, Stevanus Nalendra; Abiyyu, Rayhan Khairunnan
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.467

The geothermal potential of the Lake Ranau area comes from the remains of magmatic activity from Mount Seminung. The geothermal manifestation in this area is in the form of hot springs which are thought to arise through geological structures. The existence of geothermal fluid manifestations is very interesting to research, especially regarding the origin and estimation of reservoir temperature using the δ18O and δ2H isotope composition approach. It is important to know the origin of fluid manifestations to determine the potential of geothermal systems from surface manifestations fluid related to magmatic, evaporation or rock interactions. This research method uses isotope analysis to determine the origin of geothermal fluid manifestations and isotope geothermometer to estimate reservoir temperature. Isotope sampling in geothermal manifestation fluids in Kota Batu Village was 3 samples and Lombok Village was 3 samples. The results of isotope analysis on the relationship graph between δ18O and δ2H show that all isotope samples in geothermal manifestation fluids come from meteoric water. The local meteoric water line value equation has a difference in the deuterium excess (DE) value compared to the global meteoric water line value equation. This change in DE value is due to the interaction and mixing process between geothermal fluid and rock (connate water) with the source of evaporation and precipitation from Lake Ranau. The results of isotope geothermometer calculations based on the isotope fractionation factor, it is estimated that the reservoir temperature is around ± 270 0C. Reservoir temperature estimates show that all isotope samples in geothermal manifestation fluids are classified as high temperatures.

Diagenetic Controls on Porosity in Sandstones of the Talang Akar Formation: A Case Study from the Rambangnia River Track, South OKU, South Sumatra Rochmana, Yogie Zulkurnia; Jati, Stevanus Nalendra; Puspita, Mega; Idarwati, Idarwati; Pranata, Ridho
Jurnal IPTEK Vol 29, No 1 (2025)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2025.v29i1.6746

Porosity contributes to fluid storage and determines reservoir quality. The higher the porosity, the more free space is available to store fluid. However, the porosity of reservoirs, particularly the sandstones of the Talang Akar Formation of the Rambangnia River track, is not always good. The diagenetic process in the formation of sandstones is thought to contribute to variations in porosity quality. This study aims to determine the control of diagenesis on the porosity of sandstones of the Talang Akar Formation of the Rambangnia River, South Sumatra. The research methods used were field observation, petrographic, diagenesis, and porosity analysis. Based on petrographic analysis, the study area has three types of sandstone: lithic wacke, sublitharenite, and litharenite. The study of diagenesis shows that the sandstones in the Rambangnia River’s Talang Akar Formation have gone through an intense compaction phase, dissolution, cementation by silica and calcite minerals, and an authigenic phase in clay minerals. In general, the porosity of rocks in the study area ranges from fair to good.

Green the Islamic boarding school: Eco enzyme training for organic waste management Rendana, Muhammad; Susanti, Susi; Yandriani, Yandriani; Jati, Stevanus Nalendra; Renaldi, Fadhlurrahman; Akbar, M. Naufal
Community Empowerment Vol 10 No 4 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.13150

The issue of organic waste, which predominantly originates from households and is also generated by educational institutions such as schools, has the potential to cause environmental impacts if not managed properly. Organic waste holds significant potential to be processed into eco enzyme, which has various benefits. Recognizing this potential, this community service program aimed to empower the community at Pondok Pesantren At Tauhiid, Indralaya, South Sumatra, through eco enzyme production training. The methodology employed in this activity included lectures and direct practical training. The program results indicated a 60% increase in understanding regarding eco enzyme production after participating in the training, which utilized leftover fruit and vegetable waste. This program is expected to serve as a community empowerment model for independent organic waste management, particularly within educational institution environments.

Pengaruh Perubahan Tutupan Lahan Rawa dan Ruang Terbuka Hijau terhadap Peningkatan Debit Limpasan di Kota Palembang Alia, Febrinasti; Hakki, Helmi; Jati, Stevanus Nalendra; Fakhriansyah, M
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1282

Abstrak Perubahan penggunaan lahan dari lahan non terbangun menjadi lahan terbangun akan menyebabkan terjadinya peningkatan limpasan atau aliran permukaan. Peningkatan debit puncak untuk masing-masing periode ulang tahunan disebabkan oleh berubahnya nilai koefisien limpasan (C) yang pada akhirnya meningkatkan persentase curah hujan yang menjadi limpasan permukaan. Penelitian ini difokuskan untuk memprediksi tren perubahan tutupan lahan berdasarkan ketersediaan data historis di lokasi studi yaitu antara tahun 2018, 2019 dan 2021 dengan menggunakan metode supervised maximum likelihood classification (MLC) dengan perangkat lunak ArcGIS terutama pada wilayah dengan persentase rawa terbesar di kota Palembang. Hasil analisa tutupan lahan pada DAS Kertapati menghasilkan perubahan lahan yang meningkat signifikan pada kelas tutupan lahan permukaan diperkeras yaitu 7% (2018) menjadi 12% (2021). Namun peningkatan luasan area vegetasi budidaya berupa sawah juga meningkat dari 41% (2018) menjadi 49% (2021). Analisis perhitungan debit banjir menggunakan metode Hidrograf Satuan Sintetis Soil Conservation Service dan distribusi hujan Alternating Block Method (ABM). Didapatkan pada tahun 2018 nilai debit banjir untuk periode 10 tahun sebesar 29,167 m3/det, kemudian untuk tahun 2019 nilai debit banjir untuk periode 10 tahun sebesar 34,820 m3/det dan untuk tahun 2021 nilai debit banjir untuk periode 10 tahun sebesar 34,169 m3/det. Kata kunci: limpasan, perubahan tutupan lahan, debit rencana, hidrograf Abstract Changes in land cover from undeveloped to developed areas lead to an increase in runoff or surface flow. The rise in peak discharge for each annual return period is attributed to changes in the runoff coefficient (C), which increases the percentage of rainfall contributing to surface runoff. This study aims to predict trends in land cover change based on the availability of historical data from 2018, 2019 and 2021, utilizing the supervised maximum likelihood classification (MLC) method with ArcGIS software, particularly in regions with the biggest wetlands in Palembang City. The results of the land cover analysis in the Kertapati Watershed revealed a significant increase in the impervious surface, rising from 7% in 2018 to 12% in 2021. Conversely, the area of cultivated vegetation, specifically rice fields, also increased from 41% in 2018 to 49% in 2021. To analyze flood discharge, the study employed the Soil Conservation Service Synthetic Unit Hydrograph method and the Alternating Block Method (ABM) for rainfall distribution. The findings indicated that the flood discharge value for a 10-year return period was 29.167 m³/sec in 2018, increasing to 34.820 m³/sec in 2019 and slightly decreasing to 34.169 m³/sec in 2021. Keywords: runoff, land cover change, design discharge, hydrograph

ASAL USUL FLUIDA MANIFESTASI PANAS BUMI DAN ESTIMASI TEMPERATUR RESERVOIR DENGAN PENDEKATAN ANALISIS ISOTOP PADA DAERAH DANAU RANAU, OGAN KOMERING ULU (OKU) SELATAN, SUMATERA SELATAN: ORIGIN OF GEOTHERMAL MANIFESTATION FLUID AND DETERMINATION OF RESERVOIR TEMPERATURE USING ISOTOPE ANALYSIS APPROACH IN THE LAKE RANAU AREA, SOUTH OGAN KOMERING ULU (OKU), SOUTH SUMATERA Ibrahim, Mochamad Malik; Harnani, Harnani; Jati, Stevanus Nalendra; Abiyyu, Rayhan Khairunnan
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.467

The geothermal potential of the Lake Ranau area comes from the remains of magmatic activity from Mount Seminung. The geothermal manifestation in this area is in the form of hot springs which are thought to arise through geological structures. The existence of geothermal fluid manifestations is very interesting to research, especially regarding the origin and estimation of reservoir temperature using the δ18O and δ2H isotope composition approach. It is important to know the origin of fluid manifestations to determine the potential of geothermal systems from surface manifestations fluid related to magmatic, evaporation or rock interactions. This research method uses isotope analysis to determine the origin of geothermal fluid manifestations and isotope geothermometer to estimate reservoir temperature. Isotope sampling in geothermal manifestation fluids in Kota Batu Village was 3 samples and Lombok Village was 3 samples. The results of isotope analysis on the relationship graph between δ18O and δ2H show that all isotope samples in geothermal manifestation fluids come from meteoric water. The local meteoric water line value equation has a difference in the deuterium excess (DE) value compared to the global meteoric water line value equation. This change in DE value is due to the interaction and mixing process between geothermal fluid and rock (connate water) with the source of evaporation and precipitation from Lake Ranau. The results of isotope geothermometer calculations based on the isotope fractionation factor, it is estimated that the reservoir temperature is around ± 270 0C. Reservoir temperature estimates show that all isotope samples in geothermal manifestation fluids are classified as high temperatures.

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