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Journal : Jurnal Geomine

Fasies Batuan Metamorf Daerah Wumbubangka, Kecamatan Rarowatu Utara, Kabupaten Bombana, Provinsi Sulawesi Tenggara hasria hasria; Suryawan Asfar; Adriyansyah Adriyansyah; Masri Masri; Muliddin Muliddin; Arisona Arisona; Al Firman; Ali Okto; Laode M Golok Jaya
Jurnal Geomine Vol 9, No 1 (2021): Edisi April 2021
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v9i1.896

Abstract

Daerah penelitian terletak di daerah Wumbubangka, Kecamatan Rarowatu Utara, Kabupaten Bombana, Provinsi Sulawesi Tenggara.Penelitian ini bertujuan untuk mengindentifikasi jenis batuan metamorf dan fasies metamorfisme yang terdapat di daerah penelitian. Metode penelitian yang digunakan terdiri dari studi pustaka, pengambilan sampel di lapangan,  analisis labroratorium serta interpretasi data.  Hasil penelitian menunjukkan bahwa litologi daerah penelitian umumnya terdiri dari sekis mukovit dan marmer. Sekis muskovit  memiliki tekstur berupa lepidoblastik, struktur schistose, sedangkan marmer memiliki tekstur sisa dan struktur non foliasi. Adapun komposisi  mineralnya terdiri dari kalsit, klorit, kuarsa, muskovit, biotit, glukofan dan mineral opak. Adapunfasies metamorfime batuan metamorf di daerah penelitianadalah fasies sekis hijau yang dicirikan dengan kehadiran mineral muskovit, klorit, biotit, kalsit dan kuarsa.Fasies sekis hijau ini diinterpretasikan terbentuk pada temperatur 300°C-500°C.
Analisis Kestabilan Lereng Menggunakan Metode Bishop di Pit ALC-14 Tambang Batubara PT. Equalindo Makmur Alam Sejahtera Kabupaten Kutai Kartanegara, Kalimantan Timur Saldi Muhammad; Masri Masri; Hasria Hasria
Jurnal Geomine Vol 8, No 2 (2020): Edisi Agustus 2020
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v8i2.621

Abstract

The coal mining, especially at the production stage, must pay attention to the slope stability. This study aims to determine the factor of safety (FoS) of the mine slope with the limit equilibrium method. This analysis also includes the influence of the slope geometry, physical and mechanical properties of the slope materials of PT. Equalindo Makmur Alam Sejahtera, East Kalimantan. The limit equilibrium method used is the Bishop Method, which uses the principle of moment equilibrium by calculating the normal force between slices. The geomorphology unit classified as hilly units with 70% angle of slope face, composed by sandstone and claystone intercalations with coal. The results of the analysis show the stability level of lowwall, and highwall slopes are quite varied with low FoS values found on the lowwall, such as the slopes in the incision B-B 'and C-C'. The slip failure on the unstable slope is in the contact area between sandstone and claystone, although single slope analysis also shows the slip failure in the form of claystone and coal contact. The low FoS value on the lowwall slope is influenced by the dip of the rock layer in the parallel direction of the slope face, supported by the higher slope face angle of the overall-slope on the lowwall, and the lower internal friction angle in the claystone. The slope design recommendations are carried out by re-sloping and enlarging the width of the bench. The presence of tension cracks and mud cracks on unstable slope faces shows the need for slope monitoring.
Co-Authors Adriyansyah Adriyansyah Agriawan, Husran Al Firman Al Firman, Al Firman Ali Okto Ali Okto Ali Okto Ali Okto Ali Okto Andri Slamet Subandrio Anshari, Erwin Arisona Arisona Arisona Arisona, Arisona Asruddin, La Ode Atodding, Wa Ode Sitti Jumrana Awaliah, Waode Rizky Bahdad Bahdad Darnawati Darnawati Deniyatno, Deniyatno Erick Riyanto Erzam S Hasan Erzam S. Hasan Febiyanti Fuad Jafar Golok Jaya, La Ode Muhammad Hamid, Fanul Harisma Buburanda, Harisma Hasria Hasria - Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria Hasria, Hasria Ihksan Juarsan, Laode Imam Achmad Sadisun Jana Cindy Salinding Jaya, Rio Irhan Mais Cendra Juarsan, Laode Ihksan Khalifa Akbar La Hamimu La Hamimu La Ode Dzakir La Ode Muhamad Ahdiarno La Ode Muhammad Iradat Salihin La Ode Ngkoimani La Ode Ngkoimani, La Ode Laode Ngkoimani Laode Ngkoimani Marwan Zam Mili Marwan Zam Mili Mili, Marwan Zam Muhamad Jerniawan Muhammad Arba Azzaman Muhammad Arba Azzaman Muhammad Arif Muliddin Nafiu, Waode Rizky Awaliah NENI Nurul Fauziah Okto, Ali Phill Richard Saranga Pramadana, Reza Ramadani, Suci Razak Haraty, Syamsul Resmin, Masrandi Restele, La Ode Reza Pasca Purniawan Misu Rifai, Laode Ahmad Rika Yustika Rio Irhan Mais Cendra Jaya Riska Rubaiyn, Al Sahiddin, La Ode Saldi Muhammad Salihin, La Ode M. Iradat Salihin, La Ode Muhammad Iradat Sara Septiana Sawaludin Sawaludin, Sawaludin Sitti Sulaeha Suryawan Asfar Suryawan Asfar Suryawan Asfar Suwardi, Wa Ode Syahrul Syahrul Syahrul Syahrul Syahrul Syamsul Razak Haraty Syamsul Razak Haraty Tugo, Laode Jonas Ujang Sugiarno Wahab Wahab Wahab Wahab Wahab