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Geochemical Characteristics of Rocks in Coal Mines (Case Study of Coal Mining PT. ABC): Karakteristik Geokimia Batuan Pada Tambang Batubara (Studi Kasus Penambangan Batubara PT. ABC) Pratama, Gindang Rain; Pradani, Diana Irmawati; Jayaputra, Harsalim Aimunandar; Gautama, Gregorius Aryoko; Aditya, Muhammad Tri; Naibaho, Armin
Media Ilmiah Teknik Lingkungan (MITL) Vol. 10 No. 2 (2025): Media Ilmiah Teknik Lingkungan (MITL)
Publisher : Institute for Researches and Community Services Universitas Muhammadiyah Palangkaraya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33084/mitl.v10i2.10460

At the end of mining, an open pit coal mine will form a mine sump, also known as a “pit lake”. At PT ABC, the pit wall rock lithology consists of 30% potentially acidic rock and 70% non-acidic rock, with low pH sump water quality. The static test is intended to calculate the balance of acid-forming and acid-consuming components. The static test does not consider the rate of acid formation and neutralization. The objective is to determine the potential for acid formation to occur in the rock. The kinetic test aims to understand the kinetics of acid formation reactions in samples through a simulation of oxidation reactions in rocks. This test can predict long-term weathering characteristics as a function of time. Of the 4 rock samples tested statically, all samples showed PAF (Potencial Acid Forming) screening criteria. The results of the kinetic test showed that sample S1 experienced an increase in pH to 4,43, sample S2 experienced a decrease in pH to 8,03, sample S3 experienced an increase in pH to 2,44, and sample S4 experienced an increase to 7,24.

Technical Guidance On Groundwater Identification To Overcome Drought In Tanamerah Village, Saronggi, Sumenep, East Java. Gautama, Gregorius Aryoko; Jayaputra, Harsalim Aimunandar; Aditya, Muhammad Tri; Novianto, Dandung; Rahardjo, Bobby Asukmajaya; Pungarto, Irwanda Yuni
West Science Interdisciplinary Studies Vol. 3 No. 10 (2025): West Science Interdisciplinary Studies
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/wsis.v3i10.2286

Tanamerah Village is one of fourteen villages in Saronggi District, Sumenep Regency, East Java. Villagers experience water difficulties during both the rainy season and the dry season. Technical guidance will be carried out for groundwater identification to find out where the groundwater points are located that are able to meet the community's water needs. The method used for identification makes six tracks with varying distances between tracks. The length of each passage is twelve meters, and the depth of each passage is three hundred meters. Identification was carried out on village treasury land with an area of 500 m2. Six tracks in this service, the distance between tracks is 5-8 m, and the length of each track is 12 m. Track 1 was obtained from groundwater at a depth of 80m, and track 2 was obtained from groundwater at a depth of 80 m. Track 3 was obtained from groundwater at a depth of 70 m, and track 4 was obtained from groundwater at a depth of 20 m. Passage 5 is obtained from groundwater at a depth of 20 m, and passage 6 is obtained from groundwater at a depth of 70 m. Recommended drilling point is located on the TM1 line at point 8 with a depth of 80 m.

Technical Guidance On Groundwater Identification To Overcome Drought In Tanamerah Village, Saronggi, Sumenep, East Java. Gautama, Gregorius Aryoko; Jayaputra, Harsalim Aimunandar; Aditya, Muhammad Tri; Novianto, Dandung; Rahardjo, Bobby Asukmajaya; Pungarto, Irwanda Yuni
West Science Interdisciplinary Studies Vol. 3 No. 10 (2025): West Science Interdisciplinary Studies
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/wsis.v3i10.2286

Tanamerah Village is one of fourteen villages in Saronggi District, Sumenep Regency, East Java. Villagers experience water difficulties during both the rainy season and the dry season. Technical guidance will be carried out for groundwater identification to find out where the groundwater points are located that are able to meet the community's water needs. The method used for identification makes six tracks with varying distances between tracks. The length of each passage is twelve meters, and the depth of each passage is three hundred meters. Identification was carried out on village treasury land with an area of 500 m2. Six tracks in this service, the distance between tracks is 5-8 m, and the length of each track is 12 m. Track 1 was obtained from groundwater at a depth of 80m, and track 2 was obtained from groundwater at a depth of 80 m. Track 3 was obtained from groundwater at a depth of 70 m, and track 4 was obtained from groundwater at a depth of 20 m. Passage 5 is obtained from groundwater at a depth of 20 m, and passage 6 is obtained from groundwater at a depth of 70 m. Recommended drilling point is located on the TM1 line at point 8 with a depth of 80 m.

Investigation of Aquifer Model to Potential of Ground Movement at Brau Village, Kota Wisata Batu, Jawa Timur, indonesia Maha Agung, Putera Agung; Gautama, Gregorius Aryoko; Istiatun; Amir, Mardiana; Adinegara, Aldo Wirastana; Eko Wiyono; Wacono, Sidiq
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.16836

Soft soils at Brau Village area, Kota Wisata Batu (KWB) usually form in alluvial highlands due to weathering of sedimentary rocks. An upper and lower aquifer of sandy layer exist between soft soil. Groundwater pools into aquifer layers and infiltration from surface water into the soft soil layers (clayey and/ or silty) generated a ground movement potential. Study will elaborate the behavior of layers of clayey and/ or silty separated by 2 (two) aquifer layers in detail causing some damages to infrastructure. Wall and/ or floor cracks at school buildings and collapse and/ or differential settlement in road pavement are a failure of soil layers due to high pore water pressure coming from direction of aquifer zone especially during rainy season. Pore water pressures were determined by rate of settlement prediction from consolidation laboratory analyzed by Ying et al (2015) and actual measurement using electromagnetic data. Research results found that gradually increment of pore water pressure would exceed a total stress in reducing an effective stress drastically and created a location of initial ground movement at the toe of slope around infrastructure area. High pore water pressure due to the increment of water volume at aquifer layer can push down soil layers with safety factor (SF) < 1.0. At the same time, ground movement would generate cracks > 10 cm width at wall and floor of school building structure; and collapse or differential settlement occurred in road construction > 18 cm depth due to bonding agent separated between soil particles.

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