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All Journal Jurnal Sumberdaya Alam dan Lingkungan Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Mining Science and Technology Journal
Lusitania, Lusitania
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Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics

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Studi Nilai Effective Utilization (EU) terhadap Peningkatan Produksi Pengupasan Lapisan Tanah Penutup Tambang Batubara Lusitania, Lusitania; Razak, Supardi
Mining Science And Technology Journal Vol 4 No 1 (2025): Mining Science and Technology Journal
Publisher : Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Sulawesi Tenggara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54297/minetech-journal.v4i1.923

Abstract

Dalam fleet pengambilan data, produktivitas alat gali muat excavator Komatsu PC 2000 tidak mencapai target yaitu 750 bcm/jam. Ini disebabkan oleh kondisi lapangan yang nyata, di mana alat angkut dan alat gali muat sering berfungsi dengan buruk, menyebabkan waktu tunggu atau penundaan produksi. Tujuan dari penelitian ini adalah untuk menentukan variabel apa saja yang mempengaruhi nilai effective utilization, menganalisis efisiensi dan produktivitas alat gali muat excavator Komatsu PC 2000 sebelum dan sesudah perbaikan, dan menemukan peningkatan nilai produksi dan kehilangan biaya sebelum dan sesudah perbaikan. Hasil penelitian menunjukkan bahwa nilai cycle time menurun selama 42 detik sebelum perbaikan dan menjadi 38 hyd setelah perbaikan. Produksi meningkat dengan nilai awal 2,131.48 bcm dengan kehilangan biaya operasional Rp. 6,001,576.60 menjadi 5,128.56 bcm dan kehilangan biaya operasional Rp. 1,726,387.06 dengan delay time sebelum perbaikan senilai 4.49 jam menjadi 2,25 jam. Ini menunjukkan peningkatan effective utilization sebelum perbaikan sebesar 51% dan peningkatan effective utilization setelah perbaikan sebesar 76%.
A Study on the Prediction of Acid Mine Drainage Formation Rate Using Free Draining Column Leach Test for Acid Mine Drainage Prevention at Laboratory Scale Jarwinda, Jarwinda; Wibowo, Yudha Gusti; Khanafy, Abdul; Putri, Ilmi Tazkia; Fadillah, M Rizky; Lusitania, Lusitania; Kurniawan, Setyo Budi
Jurnal Sumberdaya Alam dan Lingkungan Vol 12, No 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jsal.2025.012.02.4

Abstract

ABSTRAK Acid Mine Drainage (AMD) is a major environmental concern in coal mining, particularly in Indonesia where surface mining is widely practiced. The exposure of sulfide minerals to water and oxygen leads to the formation of acidic, metal-laden leachate that poses significant risks to water resources, soil quality, and human health. Conventional treatment methods are often expensive and unsustainable, highlighting the need for preventive approaches. This study aims to predict and minimize AMD formation using the Free Draining Column Leach (FDCL) test under simulated wet-dry cycles. Various configurations of Potentially Acid Forming (PAF) and Non-Acid Forming (NAF) materials were tested, with the addition of biochar and zeolite as amendment layers. Static tests, including paste pH, NAG pH, NAPP, and Acid-Base Accounting (ABA), were used to classify the acid-generating potential of the samples. X-ray Diffraction (XRD) was conducted to assess mineral composition, and leachate was analyzed for pH and Total Dissolved Solids (TDS). Results showed that Scheme 3 (PAF–NAF–PAF) had the highest acid generation potential (pH < 4), while Schemes 4 and 5, which included biochar and zeolite, maintained neutral to alkaline conditions and lower TDS. These findings demonstrate the potential of local materials to reduce AMD risks and emphasize the importance of early prevention strategies. The FDCL method offers a valuable tool for improving mine waste management in alignment with sustainable mining practices. Keywords: Acid mine drainage; FDCL test; AMD prediction; biochar; zeolite; mine waste management
Interpretasi Biomarker dan Korelasi Minyak-Batuan Induk pada Sumur TNG-1, Cekungan Sumatra Tengah Afifah, Putri Dwi; Gustama, Muhammad Agni; Komari, Sri Desdita; Lusitania; Rus, Aisyah Minzikrina Masbar; Atmoko, Widi
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.v7i1.1742

Abstract

This study interprets biomarker characteristics and evaluates the genetic relationship between oil samples and potential source rocks from the TNG-1 well in the Cekungan Sumatra Tengah. The analysis was conducted using oil and rock geochemical parameters, n-alkane chromatograms, terpene and sterane distributions, as well as sterane ternary plots (C₂₇–C₂₈–C₂₉). The results indicate that oil samples at intervals of 5238–5277 ft, 5246–5248 ft, and 5266–5268 ft exhibit consistent geochemical characteristics and suggest thermal maturity within the early to mid-mature oil window. In contrast, rock samples at intervals of 4814 ft, 5046 ft, and 5151 ft show immature characteristics, indicated by CPI > 1.0, high Pr/nC₁₇ ratios, and n-alkane distributions biased toward long-chain compounds. Biomarker analysis reveals similarities in n-alkane distribution patterns, isoprenoid ratios, and C₂₇–C₂₈–C₂₉ sterane compositions between oil and source rock samples, indicating a strong genetic relationship. Sterane compositional correlation suggests that most samples, both oil and rock, originated from shallow lacustrine to estuarine depositional environments with significant higher-plant input. Overall, the oil samples show a strong correlation with the source rock at the 5151 ft interval based on the consistency of n-alkane, hopane, and sterane patterns.
Co-Authors Afifah, Putri Dwi Fadillah, M Rizky Gustama, Muhammad Agni Jarwinda, Jarwinda Khanafy, Abdul Komari, Sri Desdita Kurniawan, Setyo Budi Putri, Ilmi Tazkia Razak, Supardi Rus, Aisyah Minzikrina Masbar Wibowo, Yudha Gusti Widi Atmoko