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All Journal Jurnal Teknologi Mineral dan Batubara Indonesian Mining Journal Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology Indonesian Mining Journal
Nur Khoirullah
Fakultas Teknik Geologi, Universitas Padjadjaran
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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KEMAMPUGALIAN KUARI ANDESIT GUNUNG GEULIS, KECAMATAN JATINANGOR, KABUPATEN SUMEDANG, PROVINSI JAWA BARAT Mochamad Muslim Taufiq; Irvan Sophian; Nur Khoirullah; Zulfialdi Zakaria
Jurnal Teknologi Mineral dan Batubara Vol 18, No 2 (2022): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2022
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol18.No2.2022.1257

Abstract

Kebutuhan bahan baku batu andesit semakin meningkat seiring dengan perkembangan dan percepatan infrastruktur di Indonesia. Batu andesit dapat dimanfaatkan sebagai bahan baku dalam pembuatan trotoar jalan, pondasi bangunan atau dapat dijadikan sebagai bahan campuran beton. Dalam kegiatan penambangan batu andesit, diperlukan analisis untuk ketepatan penggunaan metode penambangan agar tercipta usaha pertambangan yang berdaya guna, menunjang efektivitas dan efesiensi pekerjaan serta biaya operasional. Penelitian ini dilakukan untuk mengetahui kelas massa batuan, tingkat kemampugalian batuan dan rekomendasi bentuk lereng untuk kegiatan penambangan agar dapat berjalan dengan efektif dan efisien. Metode penelitian yang digunakan adalah klasifikasi geomekanik dengan sistem rock mass rating (RMR), slope mass rating (SMR) dan analisis kemampugalian batuan. Berdasarkan klasifikasi geomekanik tersebut, diketahui kelas massa batuan memiliki kategori good rock dengan nilai RMR 69 – 79 dan SMR 53° - 65°. Metode penggalian yang disarankan berupa ripping-blasting.
THE APPLICATION OF FAILURE METHOD PROBABILITY FOR ANALYZING IN PIT DUMP STABILITY AT WEST BLOCK ‘X’ PIT PT BERAU COAL - EAST KALIMANTAN Yan Adriansyah; Rifqi Dwi Saprana; Irvan Sophian; Nur Khoirullah
Indonesian Mining Journal Vol 24, No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1217

Abstract

West Block 'X' pit is one of the coal mining locations operated by the Lati Mine Operation – PT Berau Coal. Administratively, the Lati Mine is located as part of Berau Regency – East Kalimantan. The study area is located at the north side of the concession, in a syncline fold structure zone. The disposal design in this area needs to special attention from slope stability aspect due it is located on the wing of a mega syncline with a certain slope and constituent of unconsolidated materials. The pit design needs to be stable. The purpose of this study is to determine the level of stability of the in-pit dump by analyzing the current in-pit dump stability based on the value of the safety factor (FS) and the probability of failure (PoF). The method used in this study is a probabilistic analysis of slope stability based on the Morgenstern-Price method to obtain the value of the safety factor and the probability of failure. The study results show that the slope is in the safe category (stable slope) in the range of PoF values 0 – 1%, marginal slope 1 – 12%, and unstable slope above 12%. Based on such as results, it is necessary to modify the slope geometry categorized as unstable to carry out mine operation safely underneath the toe of slope.
Analysis of Tectonic Control Using Order and Bifurcation Ratio Ghoffar Cahya Madani; Raden Irvan Sophian; Nur Khoirullah
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i1.34639

Abstract

Quantitative geomorphological can be analyzed using watersheds morphometric aspect. Morphometry can be interpreted as a quantitative aspect of watersheds or parameters of watershed characteristics that can be measured and calculated. This research was shown to determine the tectonic control of the research area with the approach of the morphometric aspect of watershed. Aspect of watershed morphometry used in this research consist of river order and bifurcation ratio (Rb), drainage density (Dd), asymmetry factor (Af), mountain front sinuosity (Smf) and watershed shape index (Bs). The method used in this research is the studio method by processing Digital Elevation Model data using Arcmap software. Based on the results obtained, there are 4 sub-watersheds in the research area that have different calculation values. Sub-Watershed 1 has an Af value is (66,025), Smf value is (1.43 – 4.56), and Bs value is (1,002). Sub-Watershed 2 has an Af value is (51,398), Smf value is (1.38 – 3), and Bs value is (0.907). Sub-Watershed 3 has an Af value is (49,536), Smf value is (1.17 – 2.91), and Bs value is (0.933). Sub-Watershed 4 has an Af value is (60,407), Smf value is (1.8 – 3), and Bs value is (1,486). Based on all the calculation results, the relative tectonic activity index (IATR) value is 3 which belongs to class 4 which indicates low tectonic activity in the research area. This is also supported by the calculation of the bifurcation ratio where only a small part of the river segment is affected tectonics, meaning most of the others are not active tectonically.
KEMAMPUGALIAN KUARI ANDESIT GUNUNG GEULIS, KECAMATAN JATINANGOR, KABUPATEN SUMEDANG, PROVINSI JAWA BARAT Mochamad Muslim Taufiq; Irvan Sophian; Nur Khoirullah; Zulfialdi Zakaria
Jurnal Teknologi Mineral dan Batubara Vol 18 No 2 (2022): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol18.No2.2022.1257

Abstract

Kebutuhan bahan baku batu andesit semakin meningkat seiring dengan perkembangan dan percepatan infrastruktur di Indonesia. Batu andesit dapat dimanfaatkan sebagai bahan baku dalam pembuatan trotoar jalan, pondasi bangunan atau dapat dijadikan sebagai bahan campuran beton. Dalam kegiatan penambangan batu andesit, diperlukan analisis untuk ketepatan penggunaan metode penambangan agar tercipta usaha pertambangan yang berdaya guna, menunjang efektivitas dan efesiensi pekerjaan serta biaya operasional. Penelitian ini dilakukan untuk mengetahui kelas massa batuan, tingkat kemampugalian batuan dan rekomendasi bentuk lereng untuk kegiatan penambangan agar dapat berjalan dengan efektif dan efisien. Metode penelitian yang digunakan adalah klasifikasi geomekanik dengan sistem rock mass rating (RMR), slope mass rating (SMR) dan analisis kemampugalian batuan. Berdasarkan klasifikasi geomekanik tersebut, diketahui kelas massa batuan memiliki kategori good rock dengan nilai RMR 69 – 79 dan SMR 53° - 65°. Metode penggalian yang disarankan berupa ripping-blasting.
POTENSI LONGSOR BERDASARKAN ANALISIS KINEMATIK PADA AREA LOW WALL PT. BUKIT ASAM TBK, SITE TANJUNG ENIM, SUMATERA SELATAN Siti Khodijah; Utari Sonya Monica; Jodistriawan Ersyari; Nur Khoirullah; Raden Irvan Sophian
Jurnal Teknologi Mineral dan Batubara Vol 19 No 2 (2023): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No2.2023.1363

Abstract

PT. Bukit Asam Tbk is an open-pit coal mining company in Muara Enim, Soutgh Sumatra. In open-pit mining activities, slope stability analysis is carried out to evaluate the mine in order to create a safe mining process. Several types of slope failure are associated with geological structures. This research was conducted to identify the type of landslides in the low wall area of Pit X PT. Bukit Asam Tbk and determine the slope stability factor based on discontinuity data using the scanline method at 8 observation points that represent the lithology of the low wall area. Methods used in this research is kinematic analysis, slope stability analysis on plane slide types and wedge. Based on the kinematic analysis, it was identified that the Pit X low wall area has the potential for plane and wedge type landslides with a relatively stable slopes.
THE APPLICATION OF FAILURE METHOD PROBABILITY FOR ANALYZING IN PIT DUMP STABILITY AT WEST BLOCK ‘X’ PIT PT BERAU COAL - EAST KALIMANTAN Yan Adriansyah; Rifqi Dwi Saprana; Irvan Sophian; Nur Khoirullah
Indonesian Mining Journal Vol 24 No 2 (2021): INDONESIAN MINING JOURNAL, Vol. 24 No. 2, October 2021
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol24.No2.2021.1217

Abstract

West Block 'X' pit is one of the coal mining locations operated by the Lati Mine Operation – PT Berau Coal. Administratively, the Lati Mine is located as part of Berau Regency – East Kalimantan. The study area is located at the north side of the concession, in a syncline fold structure zone. The disposal design in this area needs to special attention from slope stability aspect due it is located on the wing of a mega syncline with a certain slope and constituent of unconsolidated materials. The pit design needs to be stable. The purpose of this study is to determine the level of stability of the in-pit dump by analyzing the current in-pit dump stability based on the value of the safety factor (FS) and the probability of failure (PoF). The method used in this study is a probabilistic analysis of slope stability based on the Morgenstern-Price method to obtain the value of the safety factor and the probability of failure. The study results show that the slope is in the safe category (stable slope) in the range of PoF values 0 – 1%, marginal slope 1 – 12%, and unstable slope above 12%. Based on such as results, it is necessary to modify the slope geometry categorized as unstable to carry out mine operation safely underneath the toe of slope.
Co-Authors Ghoffar Cahya Madani Irvan Sophian Jodistriawan Ersyari Mochamad Muslim Taufiq Raden Irvan Sophian Rifqi Dwi Saprana Siti Khodijah Utari Sonya Monica Yan Adriansyah Zulfialdi Zakaria