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Characterization of Coal Quality Based On Ash Content From M2 Coal-Seam Group, Muara Enim Formation, South Sumatra Basin Nasution, Frillia Putri; Nalendra, Stevanus
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 3 (2017): JGEET Vol 02 No 03 : September (2017)
Publisher : UIR PRESS

Muara Enim Formation is well known as coal-bearing formation in South Sumatra Basin. As coal-bearing formation, this formation was subjects of many integrated study. Muara Enim Formation can be divided into four coal-seam group, M1, M2, M3, and M4. The M2 group comprising of Petai (C), Suban (B), Lower Mangus (A2), and Upper Mangus (A1). Depositional environments of Group M2 is transitional lower delta plain with sub-depositional are crevasse splay and distributary channel. The differentiation of both sub-depositional environments can be caused the quality of coal deposit. One of quality aspects is ash content. This research conducted hopefully can give better understanding of relationship between depositional environments to ash content. Group M2 on research area were found only Seam C, Seam B, and Seam A2, that has distribution from north to central so long as 1400 m. Coal-seam thickness C ranged between 3.25-9.25 m, Seam B range 7.54-13.43 m, and Seam C range 1.53-8.37 m, where all of coal-seams thickening on the central part and thinning-splitting to northern part and southern part. The ash content is formed from burning coal residue material. Ash contents on coal seam caused by organic and inorganic compound which resulted from mixing modified material on surrounded when transportation, sedimentation, and coalification process. There are 27 sample, consists of 9 sample from Seam C, 8 sample from Seam B, and 10 sample from Seam A2. Space grid of sampling is 100-150 m. Ash content influenced by many factors, but in research area, main factor is existence of inorganic parting. Average ash content of Seam C is 6,04%, Seam B is 5,05%, and Seam A2 is 3,8%. Low ash content influenced by settle environment with minor detrital material. High ash content caused by oxidation and erosional process when coalification process. Ash content on coal in research area originated from detritus material carried by channel system into brackish area or originated from higher plant in brackish area. The high ash content also can be caused by after the coal deposited. It had originated from overburden horizon which infill in cleat of coal seam.

Macerals Analysis Seam M2 Muaraenim Formation, : Implication Toward Coal Facies and Coal Rank in Kendi Hill, South Sumatra Rajagukguk, Yonathan Mangatur; Jati, Stevanus Nalendra
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

The Muaraenim Formation is a coal bearing formation in South Sumatra Basin of the Late Miocene – Pliocene. Shell (1978) divides this formation based on coal seam content are: M1, M2, M3, and M4. Coal seam in this area include in seam M2 member, with the general characteristics of the presence of silicified coal on the roof and floor of coal seams as a marker. The administration of the research area is located in east Kendi Hill, South Sumatra. The Kendi Hill is composed of adesite igneous rocks that intruded Muaraenim Formation in unconformity at the time of Pleistocene. This study aims to determine the environment of coal depositional based on maceral analysis and determine the factors influence the physical characteristics of coal seams in Kendi Hill. Data that has been obtained from the field, then conducted a selection process. The number of samples analyzed were  nine sample based on near and far to the Kendi Hill spread from the southern, central, and northern of the location. The  result of the analysis will display the maceral diagram. Megascopically, coal seam in the Kendi Hill are black, dull with bright, uneven – subchoncoidal, blackish brown in streak, have a pyrite and resin. The thickness of the coal seams ranges from 0,45 to 14 meters. Based on the maceral analysis, the coal seam in the Muaraenim Formation is composed dominated by vitrinite, then liptinite, inertinite and mineral matter pyrite (1,6-6,6%). Vitrinite reflectance of coal in the research area ranges from (0,37-0,48%) that included to the Sub bituminous – High Volatile Bituminous C. From the results of Tissue Preservation Index and Gelification Index value indicated that the environment of coal depositional in the research area was a limnic to wet forest swamp. Whereas the deposition of the Muaraenim Formation in deltaic environment (Transitional lower delta  plain).

Analisis Fondasi Disposal Tambang Terbuka PT Bara Anugrah Sejahtera, Muara Enim, Sumatera Selatan Sebayang, Wangga; Jati, Stevanus Nalendra
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 2, No 1 (2020)
Publisher : Prosiding Seminar Teknologi Kebumian dan Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (950.23 KB)

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 13,45Â°, 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.

IMPLEMENTASI PARAMETER HIDROLIKA GUNA ZONASI KAWASAN RAWAN BANJIR PADA SUB DAS KOMERING ULU, SUMATERA SELATAN Viandaru, Lorensius Vemo; Jati, Stevanu Nalendra
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 2, No 1 (2020)
Publisher : Prosiding Seminar Teknologi Kebumian dan Kelautan

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Kejadian banjir bandang di Sungai Saka (bagian dari Sub-DAS Komering Ulu) pada 8 Mei 2020 yang menerjang Kecamatan Muara Dua dengan kepadatan penduduk 177,47 jiwa/km2 ditengarai karena adanya peningkatan curah hujan serta perubahan pola tutupan lahan di hulu. Akibatnya terjadi peningkatan debit aliran hingga ketidakmampuan badan sungai dalam menerima respon. Berangkat dari kejadian tersebut maka penelitian ini mengkaji parameter hidrolika pada Sub DAS Komering Ulu yang berimplikasi langsung pada potensi banjir. Parameter hidrolika meliputi: 1) intensitas curah hujan; 2) koefisien limpasan; 3) estimasi debit rencana aliran. Analisis curah hujan maksimum berdasarkan Stasiun Hujan Batumarta dan Stasiun Menangasari, sehingga diperlukan pendekatan statistik melalui persamaan Mononobe-Sherman yang berperan dalam uji akurasi dengan deviasi terkecil. Sedangkan koefisien limpasan mengoptimalkan big data dari Kementerian Lingkungan Hidup dan Kehutanan (KLHK). Kemudian koefisien limpasan dan debit rencana aliran menerapkan metode Hassing dan metode Rasional, yang mana hasilnya dimodelkan menggunakan software Hydrologic Engineering Center-River Analysis System (HEC-RAS). Hasil penelitian melalui komparasi data curah hujan harian maksimum tahun 2011- 2019 menunjukkan adanya lonjakan intensitas curah hujan dari 64,56 mm/jam hingga 337,89 mm/jam. Selain itu, terdapat variasi jenis batuan yang memengaruhi nilai koefisien limpasan. Faktor tersebut yang mengakibatkan debit rencana aliran meningkat sebesar 12,8% dengan periode ulang lima dan sepuluh tahun, yang berarti dapat memberi simulasi debit puncak. Sehingga model analisis ini berperan sebagai upaya preventif serta mereduksi dampak negatif di sekitar Sub DAS Komering Ulu.

Analysis of Landslide Prone Areas in Tampahan, Toba Samosir Regency, North Sumatra Province Turnip, Winda Lestari; Jati, Stevanus Nalendra
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.

Characterization of Coal Quality Based On Ash Content From M2 Coal-Seam Group, Muara Enim Formation, South Sumatra Basin Frillia Putri Nasution; Stevanus Nalendra
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 3 (2017): JGEET Vol 02 No 03 : September (2017)
Publisher : UIR PRESS

Muara Enim Formation is well known as coal-bearing formation in South Sumatra Basin. As coal-bearing formation, this formation was subjects of many integrated study. Muara Enim Formation can be divided into four coal-seam group, M1, M2, M3, and M4. The M2 group comprising of Petai (C), Suban (B), Lower Mangus (A2), and Upper Mangus (A1). Depositional environments of Group M2 is transitional lower delta plain with sub-depositional are crevasse splay and distributary channel. The differentiation of both sub-depositional environments can be caused the quality of coal deposit. One of quality aspects is ash content. This research conducted hopefully can give better understanding of relationship between depositional environments to ash content. Group M2 on research area were found only Seam C, Seam B, and Seam A2, that has distribution from north to central so long as 1400 m. Coal-seam thickness C ranged between 3.25-9.25 m, Seam B range 7.54-13.43 m, and Seam C range 1.53-8.37 m, where all of coal-seams thickening on the central part and thinning-splitting to northern part and southern part. The ash content is formed from burning coal residue material. Ash contents on coal seam caused by organic and inorganic compound which resulted from mixing modified material on surrounded when transportation, sedimentation, and coalification process. There are 27 sample, consists of 9 sample from Seam C, 8 sample from Seam B, and 10 sample from Seam A2. Space grid of sampling is 100-150 m. Ash content influenced by many factors, but in research area, main factor is existence of inorganic parting. Average ash content of Seam C is 6,04%, Seam B is 5,05%, and Seam A2 is 3,8%. Low ash content influenced by settle environment with minor detrital material. High ash content caused by oxidation and erosional process when coalification process. Ash content on coal in research area originated from detritus material carried by channel system into brackish area or originated from higher plant in brackish area. The high ash content also can be caused by after the coal deposited. It had originated from overburden horizon which infill in cleat of coal seam.

Macerals Analysis Seam M2 Muaraenim Formation, : Implication Toward Coal Facies and Coal Rank in Kendi Hill, South Sumatra Yonathan Mangatur Rajagukguk; Stevanus Nalendra Jati
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

The Muaraenim Formation is a coal bearing formation in South Sumatra Basin of the Late Miocene – Pliocene. Shell (1978) divides this formation based on coal seam content are: M1, M2, M3, and M4. Coal seam in this area include in seam M2 member, with the general characteristics of the presence of silicified coal on the roof and floor of coal seams as a marker. The administration of the research area is located in east Kendi Hill, South Sumatra. The Kendi Hill is composed of adesite igneous rocks that intruded Muaraenim Formation in unconformity at the time of Pleistocene. This study aims to determine the environment of coal depositional based on maceral analysis and determine the factors influence the physical characteristics of coal seams in Kendi Hill. Data that has been obtained from the field, then conducted a selection process. The number of samples analyzed were nine sample based on near and far to the Kendi Hill spread from the southern, central, and northern of the location. The result of the analysis will display the maceral diagram. Megascopically, coal seam in the Kendi Hill are black, dull with bright, uneven – subchoncoidal, blackish brown in streak, have a pyrite and resin. The thickness of the coal seams ranges from 0,45 to 14 meters. Based on the maceral analysis, the coal seam in the Muaraenim Formation is composed dominated by vitrinite, then liptinite, inertinite and mineral matter pyrite (1,6-6,6%). Vitrinite reflectance of coal in the research area ranges from (0,37-0,48%) that included to the Sub bituminous – High Volatile Bituminous C. From the results of Tissue Preservation Index and Gelification Index value indicated that the environment of coal depositional in the research area was a limnic to wet forest swamp. Whereas the deposition of the Muaraenim Formation in deltaic environment (Transitional lower delta plain).

TIPE POLA SEBARAN DAN KEMENERUSAN LAPISAN BATUBARA DI LOKASI PENELITIAN, SEKITAR LOKASI, DAN REGIONAL KASUS WILAYAH SAYAP BARAT ANTIKLIN PALARAN YANG MENUNJAM Stev. Nalendra Jati
Jurnal Ilmiah MTG Vol 7, No 1 (2014)
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.277 KB)

Secara administrasi lokasi penelitianberadadi lokasi Tepok, Kecamatan Loa Janan, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur. Tujuan yang ingin dicapai dari penelitian ini yaitu: a)mengetahui pengaruh proses geologi terhadap pola sebaran dan kemenerusan lapisan batubara: b)membangun model kendali geologi terhadap pola sebaran dan kemenerusan lapisan batubara di lokasi penelitian, sekitar lokasi penelitian, dan regional.Geometri lapisan batubara khususnya pola sebaran dan kemenerusan lapisan batubara di lokasi penelitian, sekitar lokasi penelitian, dan regional saling berkaitan karena masih menjadi satu kesatuan dalam proses-proses geologi sebagai pengendali utama pola sebaran dan kemenerusan lapisan batubara. Faktor pengendali pola sebaran dan kemenerusan lapisan batubara di lokasi penelitian, sekitar lokasi penelitian, dan regional adalaherosi permukaan, struktur geologi lipatan dengan jenis antiklin menunjam dan homoklin, serta struktur geologi sesar.Kata kunci: geologi, pola sebaran, kemenerusan, lokasi penelitian

PEMANFAATAN SISTEM INFORMASI GEOGRAFIS UNTUK KAJIAN LINGKUNGAN HIDUP SEBAGAI PEMBELAJARAN DI ERA PENDIDIKAN 4.0 BAGI GURU GEOGRAFI DI DAERAH SUMATERA SELATAN Muhammad Rendana; Stevanus Nalendra Jati; Ardi Saputra; Nurhayati Damiri
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 6 No. 1 (2022): Jurnal Panrita Abdi - Januari 2022
Publisher : LP2M Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/pa.v6i1.12772

In education 4.0, digital technology and information systems need to be implemente in the education sector from the school to the university level. Specifically, the Geographic Information System (GIS) application needs to be mastered for the geography teachers to develop creativity related to their learning material. Based on this reason, the community dedication activity aims to improve the competency of geography teachers in the South Sumatera Province in the application of GIS for environmental studies. The method used in this activity is the GIS webinar activity and the evaluation of the action using a questionnaire. The results found that all participating teachers have well understood the webinar material. It indicates the output of the comprehension index polls before and after joining the webinar, which increased from 35% to 86%. Besides, another result also showed that the majority of teachers gave high assessments of the percentage satisfaction index that related to some aspects such as webinar activity (91.9%), speaker (87.9%), and the relevance of webinar materials to their job (96.8%). In conclusion, this webinar activity has a tremendous positive impact in improving the competency of geography teachers, especially for the application of GIS for environmental studies. --- Pada era pendidikan 4.0 ini, penggunaan teknologi digital dan sistem informasi perlu diimplementasikan dalam bidang pendidikan dari tingkat sekolah hingga universitas. Untuk guru geografi khususnya, aplikasi Sistem Informasi Geografis (SIG) sangat perlu dikuasai sehingga guru bisa mengembangkan kreativitas terkait materi ajar kepada siswa. Berdasarkan hal tersebut, tujuan kegiatan pengabdian kepada masyarakat ini adalah untuk meningkatkan kompetensi guru-guru geografi di daerah Provinsi Sumatera Selatan dalam pemanfaatan SIG untuk kajian lingkungan hidup. Metode yang digunakan yaitu kegiatan webinar SIG dan evaluasi kegiatan menggunakan kuesioner. Hasil kegiatan mendapatkan bahwa semua guru mampu memahami materi webinar yang disampaikan oleh narasumber dengan baik, ini ditunjukkan dengan hasil polling tingkat pemahaman peserta pada sebelum dan setelah pembekalan materi yang mengalami peningkatan dari 35% kepada 86%. Hasil evaluasi kegiatan juga menunjukkan bahwa mayoritas guru memberikan persentase indeks kepuasan yang tinggi terkait kegiatan webinar (91,9%), narasumber (87,9%), dan relevansi materi dengan pekerjaan (96,8%). Secara keseluruhan, kegiatan webinar ini memberikan dampak positif yang besar dalam peningkatan kompetensi guru-guru geografi terutama untuk penerapan SIG untuk kajian lingkungan hidup.

REKAYASA GEOMETRI DESAIN LERENG BERDASARKAN ANALISIS NILAI FAKTOR KEAMANAN PIT TAMBANG AIR LAYA UTARA PT BUKIT ASAM Tbk Kesya Simbolon; Stevanus Nalendra Jati; Jodistriawan Ersyari
Prosiding Temu Profesi Tahunan PERHAPI 2020: PROSIDING TEMU PROFESI TAHUNAN PERHAPI
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/ptptp.v0i0.141

Tambang Air Laya Utara merupakan pit area yang dikelola oleh PT Bukit Asam Tbk dengan metode tambang terbuka. Seperti pada tambang terbuka lainnya, kestabilan lereng menjadi hal yang sangat kritis untuk selalu dilakukan evaluasi secara berkala. Maka dari itu penelitian ini berfokus pada rekayasa geometri desain lereng berdasarkan analisis faktor keamanan (FK). Penelitian ini menerapkan metode Bishop untuk evaluasi empat penampanng yang berbeda. Lebih lanjut, FK dari nilai material properties old dump berdasarkan data bor tahun 2019 dikomparasi dengan data mould tahun 2020. Hasil kajian diantaranya; lereng dengan kondisi muka air tanah jenuh memiliki nilai FK1,25 yaitu pada penampang A,B dan C; sedangkan penampang D memiliki nilai FK1,25. Adapun kajian rekayasa yang dilakukan adalah : a) peningkatan nilai FK dilakukan dengan memodifikasi geometri desain bulan Mei dengan perbandingan tinggi dan lebar bench 1:3 untuk material old dump dan 1:1 pada material insitu; b) single slope bench dimodifikasi menjadi 20⁰ dengan lebar berm 18-20 m; c) pengupasan old dump hingga 30 m. Tiga komponen rekayasa tersebut dijadikan acuan dalam evaluasi desain tahun 2020. Tindak lanjut berikutnya pada kestabilan lereng yang dipengaruhi oleh penurunan muka air tanah adalah desain paritan secara horizontal maupun vertikal.

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