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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi Jurnal Himasapta Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Journal of Earth and Marine Technology (JEMT) Journal of Civil Engineering and Technology Sciences Beujroh : Jurnal Pemberdayaan dan Pengabdian pada Masyarakat Dinamika Teknik Sipil: Majalah Ilmiah Teknik Sipil Jurnal Teknologi Sumberdaya Mineral
Emanuel G. Manek
Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Jember
Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics Social Sciences Transportation Other

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Characterization Coal of The Warukin Formation in Kananai Village, South Barito, Central Kalimantan, Indonesia Arica Nefia; Manek, Emanuel Grace
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 1 (2026): JGEET Vol 11 No 01 : March (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.1.21616

Abstract

This research was conducted to identify geological conditions and the influence of maceral composition on the quality and rank of coal in the study area, which is divided into four rock units. The method used is surface geological mapping to describe the local geological conditions, as well as laboratory analysis which includes maceral analysis, vitrinite reflectance, proximate, and calorific value. The focus of the research is on the unit bedding of mudstone and sandstone with Coal (Warukin Formation) which is a coal-bearing unit. The results of the analysis show that the coal in the study area has the highest rank with an average vitrinite reflectance value (Rv%) of 0.55, the calorific value of 6896 cal/gr, and coal rank is included in the high volatile bituminous C category.
Identifikasi Sumber Pencemaran Kualitas Air Berdasarkan Rasio Nitrat dan Klorida Serta Parameter Bakteri Fecal Coliform di Mata Air Mrutu dan Sekitarnya, Kabupaten Lumajang, Jawa Timur Manek, Emanuel Gracek; Amirrul, Hafids Galant; Rachman, Mochammad Hasmannoor
JENERAL Vol. 6 No. 2 (2025)
Publisher : JENERAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v6i2.60004

Abstract

Kabupaten Lumajang Provinsi Jawa Timur secara administratif terletak pada lereng gunung api Bromo sehingga memiliki banyak mata air. Salah satu mata air tersebut adalah mata air Mrutu yang terletak di bagian timur Gunung Bromo dengan debit 1.750 Liter/detik yang potensi menjadi penyedia air melalui SPAM regional dimasa yang akan datang selama kuantitas dan kualitasnya sesuai dengan peruntukannya. Oleh karena itu dilakukan fokus kajian pada sumber pencemar yang berpotensi mendegradasi kualitas mata air Mrutu dan sekitarnya. Pengambilan sampel mata air untuk mengetahui kandungan nitrat, ion klorida dan bakteri fecal coliform pada air tanah dilakukan sebanyak 10 sampel di sekitar wilayah mata air Mrutu. Rata-rata rasio nitrat dan klorida pada air tanah di daerah penelitian berada pada rasio 3:1. Sebagian besar nitrat yang terdapat pada air tanah di daerah penelitian berasal dari feses, sumber dari feses tersebut dapat berasal dari kebocoran pada sistem sanitasi pada rumah, adanya peternakan, dan penggunaan pupuk yang berbahan dari feses hewan pada area perkebunan dan tegalan/ladang yang juga berperan besar juga dalam pencemaran dikarenakan wilayah penelitian yang masih jarang pemukiman dan didominasi oleh wilayah perkebunan dan ladang.berdasar pada kelas air dalam PP Nomor 22 Tahun 2021 tentang Peyelenggaraan Perlindungan dan Pengelolaan Lingkungan Hidup maka MA 13, MA 19 melebihi ambang batas kelas I. Perlu di perhatikan bahwa selain di MA 16 dan MA 26 yang mengandung fecal coliform yang < 1,8  teridentifikasi mengandung fecal coliform sehingga pemberlakuan zona perlindungan mata air perlu diimplementasikan.
Disposal Transition and Drainage Design at Pit 2AA SLS Site: A Case Study at PT Sentosa Laju Sejahtera, Loa Janan Suparno, Fanteri Aji Dharma; Ariadi, Arda Bara; Irawan, Januar Fery; Aminah, Siti; Haeruddin; Rini, Utari Retno Sulistyo; Mulyani, Kurnia Dewi; Manek, Emanuel Grace
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): Article In Press-JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

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Abstract

This research discusses the design of the disposal area transition and drainage system in Pit 2AA of PT Sentosa Laju Sejahtera to overcome the limited space of the stockpile due to the use of the backfilling method. The main issues include effective drainage design, selection of alternative disposal sites, and embankment slope stability analysis. The planned rainfall was calculated using the Gumbel distribution with rainfall data for the last 10 years (2014-2023), while the runoff water discharge was calculated using the Rational method, resulting in a discharge of 7.8 m³/second. The open channel was designed with two trenches, Trenches A and B, with capacities of 9.59 m³/sec and 7.92 m³/sec, respectively. The disposal design was placed outside the Life of Mine boundary, using the gradual finger disposal method with three levels from elevation 93 to 105 meters. The slope geometry consists of a tier height of 4 meters, a tier width of 15 meters, a single slope angle of 30°, and an overall slope of 13°. The total disposal capacity reached 441,310 BCM. Slope stability analysis was conducted using the Janbu Simplified method, showing that the factor of safety (FK) value is in the range of 1.308-2.404, meeting the minimum FK ≥ 1.3 according to the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018. The results show that the drainage and disposal designs are technically feasible and support the sustainability of mine operations.
Co-Authors Aliansyah, Muhammad Yusuf Amirrul, Hafids Galant Aprilia, Faridha Ariadi, Arda Bara Arica Nefia Arica Nefia Arrisaldi, Thema Assyarbini, Muhammad Akbar Bachri, Rian Akmal Fanteri Aji Dharma Suparno Haeruddin Haeruddin Haeruddin Januar Fery Irawan Kurnia Dewi Mulyani Kusuma, Di Ajeng Arum Manurung, Joel Maruba Padang, Ostwald Rachman, Mochammad Hasmannoor Rina Lestari Sitepu, Dio Aldestra Siti Aminah Siti Aminah Susatio, Raja Triatmojo, Mohammad Afiandy Utari Retno Sulistyo Rini Wahyu Wilopo