SILITONGA, HELPRIDY YOSEP (2023) ANALISIS KESTABILAN LERENG TAMBANG BIJIH EMAS MENGGUNAKAN METODE KESETIMBANGAN BATAS DI PT. SERINDING SUMBER MAKMUR KABUPATEN KETAPANG KALIMANTAN BARAT. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
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RINGKASAN
Penelitian dilakukan di PT. Serinding Sumber Makmur (PT. SSM), Desa
Petai Patah, Kecamatan Sandai, Kabupaten Ketapang, Provinsi Kalimantan Barat
dengan luas area WIUP sebesar 5.978 hektar. PT. SSM bergerak di bidang
pertambangan bijih emas yang operasi penambangannya menerapkan sistem
tambang terbuka dengan metode open pit. Kegiatan penambangan menghasilkan
lereng tunggal dengan tinggi 10 m dengan sudut kemiringan 65º dan tinggi lereng
keseluruhan 20 m. Penambangan bijih emas di pit limun perlu diteliti lebih lanjut,
hal ini mengingat adanya fenomena ketidakstabilan berupa longsoran pada lereng
pit limun.
Pemetaan geoteknik dilakukan pada lereng tunggal dengan metode scanline
disertai observasi visual untuk mengetahui kondisi bidang diskontinu di lapangan..
Material properties batuan sebagai parameter analisis kestabilan lereng didapatkan
dari hasil pengujian sifat fisik dan sifat mekanik. Geological Strength Index (GSI)
diperoleh berdasarkan hasil pemetaan geoteknik dan pengujian material properties.
Nilai GSI digunakan untuk menentukan kohesi dan sudut gesek dalam. Analisis
kestabilan lereng dilakukan sesuai jenis longsor yang berpotensi terjadi berdasarkan
metode kinematika dan dikuantifikasikan dengan metode kesetimbangan batas.
Berdasarkan hasil analisis kinematika diketahui bahwa lereng aktual
berpotensi mengalami longsor bidang dan longsor baji. Analisis longsor bidang
menghasilkan nilai Faktor Keamanan (FK) 7,68 dan Probabilitas Longsor (PL) 0%.
Analisis longsor baji menghasilkan nilai FK 1,01 dan PL 100%. Nilai FK longsor
baji tidak memenuhi kriteria penerimaan yang ditetapkan dalam Kepmen ESDM
1827/K/30/MEM/2018 sehingga dilakukan optimasi geometri lereng. Optimasi
lereng tunggal menghasilkan lereng dengan geometri tinggi 10 m dan sudut
kemiringan 64º yang memiliki nilai FK longsor baji 1,58 serta PL 0%.
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SUMMARY
The research was conducted at PT. Serinding Sumber Makmur (PT. SSM),
Petai Patah Village, Sandai District, Ketapang Regency, West Kalimantan
Province with a WIUP area of approximately 5,978 hectares. PT. SSM is engaged
in gold ore mining which applies an open pit mining system with the open pit
method. Mining activities produce a single slope with a height of 10 m, a slope
angle of 65º and an overall slope height of 20 m. Mining of gold ore in the lemonade
pit needs to be further investigated. This is due to the instability phenomenon in the
form of avalanches on the slopes of the lemonade pit.
Geotechnical mapping was carried out on a single slope using the scanline
method accompanied by visual observations to determine the condition of
discontinuous areas in the field. Rock material properties as a parameter for slope
stability analysis were obtained from the results of physical and mechanical
properties tests. The Geological Strength Index (GSI) is obtained based on the
results of geotechnical mapping and testing of material properties. The GSI value
is used to determine the cohesion and internal friction angle. Slope stability
analysis is carried out according to the type of failure that has the potential to occur
based on the kinematics method and is quantified by the limit equilibrium method.
Based on the results of kinematics analysis, it is known that the current slope
has the potential to experience plane failure and wedge failure. Analysis of plane
failures produces a Factor of Safety (FoS) value of 7.68 and a Probability of
Failure (PoF) of 0%. Analysis of the wedge failure produces a SF value of 1.01 and
a PF of 100%. The value of the FoS failure does not meet the acceptance criteria
set out in the Ministry of Energy and Mineral Resources 1827/K/30/MEM/2018, so
an optimization of the slope geometry has been carried out. Single slope
optimization produces a slope with a geometry height of 10 m and a slope angle of
64º which has a wedge failure FoS value of 1.58 and 0% PoF.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 10 Jul 2023 06:57 |
| Last Modified: | 10 Jul 2023 06:57 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/36369 |
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