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All Journal Journal of Degraded and Mining Lands Management Jurnal GEOSAPTA Jurnal Agriovet JPKMI (Jurnal Pengabdian Kepada Masyarakat Indonesia) Prima Abdika: Jurnal Pengabdian Masyarakat MINERAL
Pebrianto, Rosihan
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Journal : MINERAL

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Kajian Teknis Perencanaan Desain Peledakan Untuk Mengurangi Getaran Tanah di PT Pamapersada Nusantara Site PT Bukit Asam Tbk: Study Of Blast Design Technical To Minimize Ground Vibration At PT Pamapersada Nusantara Site PT Bukit Asam Tbk Pebrianto, Rosihan; Wibowo, Satriya; Al Hadi, Alex
MINERAL Vol 10 No 1 (2025): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/r2ftaz19

Abstract

The impacts of drill and blast activities is ground vibration. A limit of PPV according to SNI is 5 mm/s for buildings with foundations, masonry and cement. The average PPV in this blasting activity is 2 mm/s. The community is complain that level of ground vibration produced was still felt and worried damage the building. So, PT Bukit Asam Tbk has made a regulation of the ground vibration is ≤ 1 mm/s for blasting in the near houses. The purpose of this study is to make a blast design geometry form burden, spacing, and stemming, weight of explosives maximum, , delay configuration, and estimate of the fragmentation in 800m by PPV  ≤ 1 mm/s. This research method uses quantitative research methods by observing, collecting and processing data, testing data results, and making blast designs. The results show that the PPV value can be predicted using the equation of non-linear power regression. The design of the blasting geometry to obtain a PPV value of ≤ 1 mm/s is by using a presplit method, with a vulnerable space of 6 – 7.5 m, a burden of 5 – 6.5 m, and a maximum of explosives is 24-40 Kg/hole.
POTENSI LOGAM TANAH JARANG DI DALAM ABU BATUBARA: POTENTIAL OF RARE EARTH METALS IN COAL ASH Purbasari, Diana; Pebrianto, Rosihan; Harsiga, Edwin
MINERAL Vol 8 No 2 (2023): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i2.4364

Abstract

Coal is a fossil fuel that is still used as fuel for Steam Power Plants (PLTU). The greater the demand for electrical energy, the greater the need for coal to meet the fuel needs of the PLTU. The combustion of PLTU produces combustion residue in the form of fly ash and solid ash. Fly ash has its own problem level compared to solid ash. The issue of air pollution, sources of disease and radioactive pollutants are the negative impacts of fly ash left over from burning coal. Coal ash is formed from compounds that do not burn in the coal combustion process including the presence of rare earth metals (LTJ). LTJ is a valuable element which in certain levels can be processed into valuable goods. Separation of LTJ in coal can reduce the ash content and improve the quality of coal, so it is necessary to know the potential of LTJ contained in coal ash. The coal sample tested was coal from PT Bukit Asam Tanjung Enim Mining Unit. Identification of LTJ elements in the ash at the PLTU using XRD, ICP and SEM analysis. There is element Cerium (Ce) 55.3 ppm in fly ash and 22.6 ppm in bottom ash, element yttrium (Y) 36 ppm in fly ash and 10.7 ppm in bottom ash, element Lanthanum (La) 27.3 ppm on fly ash and 10.5 ppm on bottom ash. Neodymium (Nd) 26.1 ppm in fly ash and 6.9 ppm in bottom ash. Finally, there is an element of Samarium (Sm) 1.4 ppm in fly ash and 0.7 ppm in bottom ash. There is a promising potential for rare earths in coal ash, but for levels below 500 ppm it is still not feasible to manage, so it is necessary to enrich the rare earths first.
Optimasi Desain Geometri Lereng Material Old Dump Pada Usaha Penggalian Ulang Pit X PT. Bukit Asam Tbk: Optimization Of Geometry Design Of Old Dump Material Slopes On The Pit X Re-Excavation Plan Of PT. Bukit Asam, Tbk. Pebrianto, Rosihan; Louisa, Anna Amelia; Harsiga, Edwin; Waristian, Harry
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.5298

Abstract

In doing slope design, it is necessary to pay attention to slope geometry and soil shear strength. Determination of slope geometry design also considers the balance between height and slope and production benefits. Research was conducted to analyze slope stability through physical and mechanical properties testing, limit equilibrium, and probabilistic Monte Carlo methods. The surface area of the Overburden stripping area in the 2024 RKP design is 8,172.79 m2. The production target is 2,000,000 tons of coal with a volume of overburden material that must be stripped of 29,000,000 BCM and obtained a Stripping Ratio value of 14.5. The results of the evaluation of the overall slope of the Old Dump material with an overall slope height of 66.582 m, a slope width of 447.69 m, an overall slope of 8.32˚ and a bench width of 25 m, a bench height of 6 m with a comparison ratio of 1:3 and a single slope angle of 18.43˚. Then the redesign was carried out and obtained recommendation results of 64.799 m overall slope height, 303.33 m slope width, 13.02˚ overall slope, and 25 m bench width, bench height at elevation 131-110 of 8 m with a comparison ratio of 1:2, single slope 26.57˚ and at elevation 110-50 of 8 m with a comparison ratio of 1:1.5, single slope 33.69˚.
Co-Authors Ahmad Fauzan Al Hadi, Alex Bochori Bochori Budhi Setiawan Diana Purbasari Eddy Ibrahim Edwin Harsiga Edy Sutriyono Louisa, Anna Amelia Makmur Asyik Marwan Asof Maulana Yusuf Muhammad Amin restu juniah, restu Waristian, Harry Wibowo, Satriya