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All Journal International Journal of Science and Environment Ranah Research : Journal of Multidisciplinary Research and Development
Taufik Toha, Taufik
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Law, Crime, Criminology & Criminal Justice Mathematics Physics Public Health Social Sciences Transportation Other

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Analisis Pengaruh Parameter Geoteknik Batuan Terhadap Strategi Penggalian Overburden di PT. Manambang Muara Enim Imam Prabowo, Andi; Toha, Taufik; Yusuf, Maulana
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 6 No. 5 (2024): Ranah Research : Journal Of Multidisciplinary Research and Development (Juli 20
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v6i5.1032

Abstract

Metode kerja penggalian yang dilakukan saat ini di PT. MME adalah free digging dan ripping. Kajian teknis yang dilakukan untuk menentukan apakah material overburden yang digali apakah memang benar-benar free digging atau ripping, sesuai dengan karakteristik massa batuan dan kemampuan digging force alat gali-muat belum dilakukan penelitiannya. Pengaruh dari digging force dan karakteristik mekanis batuan terhadap unit adalah pada productivity yang menurun jika metode penggalian yang dilakukan tidak tepat dan juga terkait kinerja unit yaitu PA, MA, UA, dan EU. Setelah dilakukan penelitian, maka didapatkan jika material yang digali oleh alat gali muat EX1250 dan EX900 berupa material siltstone dengan nilai kuat tekan (UCS) sebesar 0,67 MPa. Sedangkan berdasarkan spesifikasi, nilai digging force masing-masing alat yaitu 0,60 Mpa untuk EX1250 dan 0,48 Mpa untuk EX900, berada di bawah nilai UCS material siltstone. Hal ini mengakibatkan adanya deviasi pada nilai productivity alat gali-muat. Pada unit EX1250, productivity dengan metode direct digging (512,52 Bcm/jam) lebih kecil dibandingkan dengan metode penggalian material ripping (552,67 Bcm/jam), yaitu sebesar 40,15 Bcm/jam. Sedangkan untuk unit EX900, productivity dengan metode direct digging sebesar 42,77 Bcm/jam, sedangkan productivity dengan metode penggalian material ripping sebesar 471,77 Bcm/jam, terdapat deviasi 50,99 Bcm/jam. Selain itu, metode penggalian direct digging dengan menggunakan unit EX1250 dan EX900 pada material siltstone, berpotensi untuk menurunkan kinerja mekanis dan utilisasi pada alat gali-muat.
Analisis Pengaruh Degradasi Parameter Geoteknik akibat Air terhadap Mining Recovery di Pit 1 PT Bukit Asam Tbk Wibowo, Vinaldo; Yusuf, Maulana; Toha, Taufik
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 6 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i6.1724

Abstract

This research was conducted with a back analysis on the pit 1 slopes of PT Bukit Asam, TBK where material deformation occurred due to saturation from material above the slope that previously contained a settling pond holding water from other pits. Slope stability analysis is necessary to achieve a stable slope geometry with FoS >1.25. The analysis performed for determining this FoS involves back analysis to obtain stable slope geometry and to calculate changes in coal recovery due to geometric changes in the excavation slope. This study aims to analyze slope stability to obtain actual geotechnical parameters in the excavation slopes affected by water and their safety factors, as well as to analyze changes in mining recovery due to changes in slope geometry. Slope stability determination is carried out by conducting analysis. This research aims to analyze slope stability to obtain actual geotechnical parameters in excavated slopes influenced by water and their safety factors, as well as to conduct an analysis to determine changes in mining recovery due to changes in slope geometry. The determination of slope stability is carried out by performing a back analysis on the excavated slopes that have experienced deformation, resulting in new geotechnical parameters that have been degraded. The degradation of geotechnical parameters on the slope of Pit 1 excavation resulted in a decrease in cohesion (C) by 63% from 77.14 Kpa to 28.26 Kpa, and the internal friction angle (Ǿ) decreased by 32% from 27.16° to 18.35°. The degradation of geotechnical parameters on the slope of Pit 1 caused a mining recovery decrease of 61.7%, where the initial pit slope plan of Pit 1 was expected to yield 4,750,000 tons of coal, while the revised pit slope plan of Pit 1 yielded 2,820,000 tons of coal.
Planning of Sharing Wall At Iup Boundaries As A Strategy For Coal Conservation And Compliance With Mining Regulations Kurniawan, Arie; Ibrahim, Eddy; Toha, Taufik; Wahyudi Putra, Rahmat
International Journal of Science and Environment (IJSE) Vol. 5 No. 4 (2025): November 2025
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v5i4.244

Abstract

Coal mining activities in adjacent Mining Business Permit (IUP) areas often face technical challenges at pit boundaries. Conventional double-wall pit designs generally lead to pit losses at border zones, increased overburden volume, and higher stripping ratios, resulting in reduced mining efficiency and suboptimal utilization of coal reserves. Meanwhile, Indonesian mining regulations—Law No. 3 of 2020 in conjunction with Law No. 4 of 2025, Government Regulation No. 96 of 2021, and Ministerial Decree of Energy and Mineral Resources (Kepmen ESDM) No. 1827 K/30/MEM/2018—emphasize the obligation to conserve mineral and coal resources through efficient and optimal mine planning. This study aims to evaluate the planning of sharing wall (joint boundary slope mining) at IUP boundaries as a strategy for coal conservation and regulatory compliance. The research methods include analyzing existing double-wall designs, developing an alternative sharing wall model, recalculating overburden volume, coal reserves, stripping ratio, and pit loss potential, and assessing technical results against conservation regulations. The case study was conducted at the boundary of PT Merapi Energy Coal’s IUP in Lahat Regency, South Sumatra. The analysis results show that implementing the sharing wall design results in a 70 million bcm deviation in overburden volume, an increase in stripping ratio from 5.39 to 5.94 bcm/ton, and an additional 11.8 million tons of recovered reserves compared to the double-wall design. This strategy supports resource conservation principles as stipulated in Kepmen ESDM No. 1827 K/30/MEM/2018, particularly regarding pit loss reduction and coal recovery optimization. Therefore, sharing wall planning not only enhances technical and economic efficiency but also strengthens compliance with national mining conservation regulations.
Co-Authors Arie Kurniawan Eddy Ibrahim Imam Prabowo, Andi Lubis, Jihan F. Maulana Yusuf Ngudiantoro . Wahyudi Putra, Rahmat Wibowo, Vinaldo