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All Journal Jurnal RISET Geologi dan Pertambangan JGE (Jurnal Geofisika Eksplorasi) Journal of the Civil Engineering Forum JIPF (Jurnal Ilmu Pendidikan Fisika) SUSTINERE: Journal of Environment and Sustainability Jurnal Mineral, Energi dan Lingkungan Angkasa: Jurnal Ilmiah Bidang Teknologi KURVATEK Jurnal Mineral, Energi dan Lingkungan Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Kemitraan, Kewirausahaan dan Pengabdian Masyarakat
Al Hussein Flowers Rizqi
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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THE EFFECT OF INTRUSION ON THE PHYSICAL AND CHEMICAL PROPERTIES OF COAL Ogara, Evan Rosyadi; Tri Wahyuni; Al Hussein Flowers Rizqi
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 3 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i3.495

Abstract

Coal is a deposit of organic matter derived from plant remains that have undergone diagenesis process to form a coal seams. This study aims to determine the impact of intrusion on the physical and chemical characteristics of coal. The location of this research is in the Air Laya mining area, PT Bukit Asam Tbk, Tanjung Enim, South Sumatra and is part of the South Sumatra Basin which is well known as one of the coal bearing formation areas. Four (4) coal samples were analysed including proximate analysis, total sulphur content, and calorific value to measure moisture content, volatile matter, fixed carbon, ash content, and calorific value of the coal. Petrology and well log analysis was used to determine lithology and regression analysis was used to assess the effect of intrusion on coal characteristics. The results of the coal analysis in the research area reveal significant differences between coal samples located near the intrusion and those farther away. Coal located near the intrusion exhibits black colour, vitreous and conchoidal fracture. In contrast, coal farther from the intrusion shows a dull, blackish-brown, brownish streak, and uneven fracture. Coal near the intrusion shows lower moisture (1.5–1.7%) and volatile matter (17–25%), but higher ash content (7.9–8.2%), fixed carbon (67–73%), calorific value (7700–7968 kcal/kg), and sulphur (0.7–0.8%). In the other hand, coal farther from the intrusion has higher moisture and volatile matter, but lower fixed carbon, calorific value, and sulphur. The findings conclude that proximity to intrusion increases fixed carbon and calorific value but also raises sulphur levels, which may pose environmental and operational concerns.
LITOLOGI PENYUSUN DAN PERSEBARAN STRUKTUR GEOLOGI PADA BUKIT CUMBRI, KECAMATAN BITING, KABUPATEN PONOROGO, JAWA TIMUR Rizqi, Al Hussein Flowers; Widianto, Fanssyah
KURVATEK Vol 11 No 1 (2026): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v11i1.6414

Abstract

Bukit Cumbri yang terletak di perbatasan Ponorogo dan Wonogiri merupakan punggungan sempit berarah timurlaut–baratdaya yang dikontrol oleh struktur regional dan perbedaan resistensi litologi, namun kajian geologi detailnya masih terbatas. Penelitian ini bertujuan mengidentifikasi litologi penyusun, serta menganalisis mekanisme struktur geologi yang memengaruhi morfologi Bukit Cumbri. Metode yang digunakan meliputi pemetaan geologi, analisis petrografi dan mikropaleontologi, serta analisis stereonet terhadap data kekar dan sesar. Hasil penelitian menunjukkan bahwa litologi terdiri atas batugamping rudstone berumur N16 (Miosen Tengah) dari lingkungan Neritik Tengah, yang ditindih oleh intrusi dangkal trachyte bertekstur porfiritik–vesikuler. Struktur geologi didominasi sesar mendatar mengiri berarah NE–SW, dengan satu lokasi menunjukkan mekanisme reverse left-slip akibat komponen kompresi lokal. Pola struktur tersebut mengontrol orientasi punggungan, lembah linear, dan posisi intrusi.. Temuan penelitian memberikan kontribusi penting dalam memahami evolusi magmatik dan tektonik lokal Ponorogo serta menjadi referensi bagi pengembangan studi geologi dan geowisata di wilayah tersebut.
Pemodelan Kemenerusan Nikel Laterit Berdasarkan Metode Radial Basis Function (RBF) Di Blok X PT. Stargate Pasific Resources, Sulawesi Tenggara Asep Bukhori; Rangga Bintang Ardaraja; Winarti Winarti; Al Hussein Flowers Rizqi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3279

Abstract

The significant nickel laterite deposits can be found in Indonesia, especially in the Sulawesi ophiolite belt, which was created by intricate tectonic processes. The purpose of this study is to use the Radial Basis Function (RBF) method to estimate the continuity of the supergene enrichment zone in Block X of PT. Stargate Pacific Resources, Southeast Sulawesi. Collar, survey, assay, and geological logging data from 118 drill holes make up the dataset, which was included into a three-dimensional (3D) modeling system. Leapfrog software is used for spatial modeling, geological and geochemical interpretation, data compositing, and top-cut analysis.The results show that the laterite profile is made up of limonite, saprolite, and bedrock zones, with nickel enrichment occurring primarily in the saprolite and somewhat in the limonite zone. The Ni grade distribution is heterogeneous with a positively skewed pattern, demonstrating the efficiency of the RBF method in capturing non-linear spatial variability when compared to traditional interpolation techniques. Furthermore, the model shows that the continuity of the supergene enrichment zone is primarily oriented west-northwest, as determined by plateau morphology, whereas thinner laterite profiles are associated with rolling hill areas due to greater erosion
Co-Authors Abdillah Ahmad, Ghani Afri Tri Kristanto Ahmad, Ghani Abdillah Alansyah, Apriko Yudhan Aprilia, Adinda Asep Bukhori Audrey, Vivi Fistina Awaluddin, muhamad Hasyim Bernadeta Subandini Astuti Delvina Syaifira Norma Hani Desie Kurnia Gae Diyoko, Diyoko Elkawi Hawinu, Nodyka Erlandi, Muhammad Fajar, Ari FATIMAH FATIMAH Fatimah Fatimah Febri Anggara Fistina Audrey, Vivi Garnis Wanengcio Uligawati Gil Lodar, Jaden Gracia Apriyani Naibobe Hafidz Sedek Haliza, Audia Shafa Hendri Tri Purnomo Herning Dyah Kusuma Wijayanti Hill Gendoet Hartono Hill Geondoet Hartono Hita Pandita Hita Pandita Ibnu Hibban, Muhammad Iqbal Hidayat Lindung Zalbuin Mase Maming, Haryadi Maurittius Antonius Talla Lamak Mayang Pitaloka Muh Gifaricandrabayu Muhammad Abdul Basith Muhammad Arifai Muhammad Dandy Fachrindra Muhammad Isna Almuzakki Nadhip, Muhammad Nadip, Muhammad Noviardi Noviardi Ogara, Evan Rosyadi Oky Sugarbo Praba Padma Arsyada Qodri, Muhammad Fatih Qoyyibi, Dava Saliham Rajawali Yudha Pratama Ramadhan, Dimas Rangga Bintang Ardaraja Rean Devindra Reditya Galang Pamungkas Reynaldo Adhiechandra S reza_krisnandi reza krisnandi Rusmania Ramadhani, Saviola SANDI KURNIAWAN Setyo Pambudi Sukartono Syamsul Arifin Tedja Trisnaning, Paramitha Tengku Riza Zarzani N Thabita Monica Tupang, Kannaya Timotius Tuska, Robert Tiurma Dewi, Alexandra Sekar Tri Wahyuni Vilman Sidik Waskita Bambang Murti Yudhana Waskita Murti Bambang Yudhana Waskita Murti Bambang Yudhana Waskita Wibisono, Dharmawan Catur Widianto, Fanssyah Wijaya, Naufal Arya Winarti Winarti Winarti Winarti Winarti Yudhana, Waskita Murti Bambang