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All Journal Journal of Geoscience, Engineering, Environment, and Technology Prosiding Temu Profesi Tahunan PERHAPI
Khomeini, Andi Ronald
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science Physics

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OPTIMALISASI BATUBARA HIGHWALL EXTEND FINAL DESAIN MASTER PIT B SEBAGAI UPAYA KONSERVASI PT. MIFA BERSAUDARA Khomeini, Andi Ronald; Zulkarnaen, Bayu Putra; Nugroho, Udi
Prosiding Temu Profesi Tahunan PERHAPI 2023: PROSIDING TEMU PROFESI TAHUNAN PERHAPI
Publisher : PERHAPI

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Abstract

Konservasi Batubara merupakan usaha yang dilakukan oleh berbagai pemangku kepentingan pertambangan batubara untuk memaksimalkan pemanfaatan batubara secara berkelanjutan dan upaya dalam rangka optimalisasi pengelolaan, pemanfaatan dan pendataan sumberdaya mineral dan batubara secara terukur, efisien, bertanggung jawab dan berkelanjutan. Hal tersebut diamanatkan dalam Keputusan Menteri Energi dan Sumber Daya Mineral (Kepmen ESDM) Republik Indonesia No. 1827 K/30/MEM/2018 serta Undang-Undang Dasar Negara Republik Indonesia tahun 1945 pasal 33 ayat 3.PT. Mifa Bersaudara sebagai perusahaan yang mengedepankan konservasi batubara selalu melihat peluang dalam mengoptimasi cadangan batubara yang menguntungkan untuk ditambang ditambah dengan Harga Batubara di tahun 2022 sangat baik.Dalam proses penambangan batubara di Pit B Ext final design Master Pit di Highwall, batubara di area tersebut masih dapat diambil dengan melakukan Cut back Area Disposal / melakukan rehandling material disposal dengan memperhatikan aspek geoteknik yaitu faktor keamanan lereng yang aman dengan visual monitoring yang intensif dan menggunakan Extensometer serta pemilihan unit untuk mengupas Material penutup atau Overburden nya. Atas dasar tersebut dibuatlah suatu kajian teknis untuk melakukan Optimalisasi Re-design Master Pit di Block 29-30 dan Strip 40-42 dengan Konsep Spesial Design PIT pengambilan batubara di highwall dengan sistem box cut mining dengan dengan sudut Slope 30º dan tinggi 5-meter dan lebar Bench 8.2 - 12 meter. Batubara Seam C dengan tebal 4–5-meter dan akan ditambang dari elevasi -27 ml hingga -32 ml. Nilai keamanan lereng highwall batubara berkisar 1,034 – 1,1 atau masuk dalam kategori kritis hingga aman (Bowles, 1989). Perolehan batubara optimasi Highwall Extend Final Desain Wall berdasarkan model yaitu 44.0 kt dengan Overburden 274 Kbcm atau SR 6.22
Geotechnical Analysis in the Case of Recovery Failure of West Out Pit Dump PT. Mifa Bersaudara Rezky, Danu; Khomeini, Andi Ronald; Balyani, Kiagus Farobi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21232

Abstract

The formation of waste dump with heterogeneity of constituent materials and muddy Base conditions as the foundation of the waste dump is a challenge for practitioners and academics so that stable embankments as a place to dispose of overburden material can be formed. Case studies that occurred at PT. Mifa Bersaudara, namely the Failure of West Out Pit Dump (OPD) Elevation +30 to elevation +15 which caused the Water Monitoring Point (WMP 24) to be damaged and potentially damage the IUP boundary road. This incident occurred through Prism monitoring and the loss of the progressive movement category which caused the disposal of elevation +30 to be sterilized from dumping operations before recovery disposal was carried out. The Back Analysis Approach, Laboratory Testing, and tracing of dumping history were carried out to obtain accurate material model and property analysis. Geotechnical recommendations start from the reconstruction of the Water Monitoring Point by re-filling the failure area at elevation +20 and the compartment embankment at elevation +23. After that, it was continued with the reconstruction of the disposal leg (counterweight) elevation +25, as well as adjusting the geometry of the disposal elevations +30, +40, and +50 so that the failure area could be re-filled. The final results obtained from this case study are that the IUP boundary road and Water Monitoring Point were successfully constructed, Optimization of disposal in the failure area can be done by adding a volume of 1.3 million bcm, and the recovery area for the failure of disposal can be used as a reclamation area with an area of ​​4 Ha. The update of the Safety Factor value after the work stated that the disposal was in a Safe condition. Description of Recommendations, Staging Plan, and future research development will be explained further in this Paper.
Co-Authors Balyani, Kiagus Farobi Nugroho, Udi Rezky, Danu Zulkarnaen, Bayu Putra