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nendi rohaendi
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INDONESIA
Jurnal Geominerba
Published by Pusat Pengembangan Sumber Daya Manusia Geologi, Mineral, dan Batubara
ISSN : 25801376     EISSN : 29632196     DOI : -
Core Subject : Science, Education, Engineering,
Earth & Planetary Sciences Education Engineering Other
The GEOMINERBA journal is published by the Center for Human Resources Development, Geology, Minerals and Coal which is published every June and December. Published publications related to the Development of Human Resources in the Field of Geology, Minerals and Coal.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 6 Documents
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Search results for , issue "Vol 4 No 1 (2019): Jurnal Geominerba 2019" : 6 Documents clear
PREDIKSI FRAGMENTASI BATUAN HASIL PELEDAKAN DENGAN PENDEKATAN MODEL KUZ-RAMPADA RENCANA PELEDAKAN BATUGAMPING DI KAMPUS LAPANGAN PPSDM-GEOMINERBA Awang Suwandhi; Charles Tambunan
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5453.617 KB) | DOI: 10.58522/ppsdm22.v4i1.80

Abstract

Fragmentation of blasting results is one of the aspects assessed in the training of the 1st Class Blaster whose the plan of blasting is carried out at the PPSDM-Geominerba field campus. The results of blasting must consider three conditions including a fraction size greater than 80 cm (boulder)maximum of 5%, a powder factor (PF) maximum of 0.30 kg/m³, and evenly fragmentation size distribution. Blasting geometry is designed with a vertical level of 8 m, average holes depth of 9.4 m with a slope of 20°, spaced 3.45 m, and burden 2.67 m. Total weight of explosives (ANFO) of 396,3kg charged in to the 18 blast holes with diameter of 76 mm. Rock fragmentation distribution predicted by Kuz-Ram model exposed a final result of blasting containing boulder of 9,53%, PF of 0,28 kg/m³, and uniformity index of 1,39. The design of blasting geometry is modified by changing the burden to 2.4 m and the other parameters being relatively the same. The results of blasting are predicted to leave a boulder of 5.76%, the uniformity index improves to 1.50, but the PF increases by 0.31 kg/m³. The modification is the optimum design of blast geometry that is feasible to be applied at the beginning of blasting activity on the field campus.
KONDISI BATAS MEDIUM PADA KOMPUTASI PENJALARAN GELOMBANG ELASTIK 2D MENGGUNAKAN METODE BEDA HINGGA Antonius Alex Harmoko
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4381.575 KB) | DOI: 10.58522/ppsdm22.v4i1.81

Abstract

In seismic wave propagation modeling, the problem is the boundary conditions of the model to approach the real situation. The boundary conditions of the model are edges, free surfaces, and boundaries between layers. In this study, 2D elastic wave propagation simulation was made using a fourth order finite difference approach and staggered grid by applying boundary conditions to the modeling. At the edges of the model, the pseudo boundary conditions were applied using the damping function to eliminate the effect of reflection on the edges of the medium model. On the free surface, the boundary conditions of the free surface are applied where the stress on the surface is zero and in the boundary between layers, all stresses and shift vectors are continuous so that propagation at the boundary of the medium will be correct. The wave source used is a Gaussian derivative. By varying the use of damping factor (Df) and damping width (nabs) at the edge of the medium model, the optimum attenuation for the pseudo boundary conditions of the model is at Df= 3 and n abs at 70-100 grid points. Free surface and between layers boundary condition are used to make corrections to the wave propagation phase changes when a wave hits the model boundary.
PEMANFAATAN BAN BEKAS UNTUK PERKUATAN STRUKTUR JALAN PADA PELEBARAN JALAN SOROWAKO – MALILI: SEBUAH KAJIAN TENTANG KESTABILAN GEOTEKNIK Wiyatno Haryanto; Nendi Rohaendi; Ridwan Banda; Zufialdi Zakaria
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3594.857 KB) | DOI: 10.58522/ppsdm22.v4i1.82

Abstract

PT Vale Indonesia Tbk is a subsidiary of Vale S.A. (Brazil) under Vale Base Metal group (Canada) located at Sorowako village, East Luwu regency, South Sulawesi province, in Indonesia, a foreign investment company in mining industry that running to explore, mine, process, and produce nickel in mate as an intermediate product. This paper is intended to introduce the “reusereduce-recycle” (3R) idea as an environmentally friendly concept by means of utilizing the scrap tires as alternative construction material for geotechnical engineering purposes. In terms of mining operational, PT Vale Indonesia Tbk consumes prefabricated tires that required for heavy equipment such as hauling trucks and wheel-loaders. Tire consumption for the mining operational is fluctuated ranging of 350–600 ea. per annum depending on some technical factors in example pavement condition, road geometry, braking frequency, payloads, et cetera. The large number of the current tire consumption is remaining a big problem in terms of availability of disposal (waste dump) to disposing the scrap tires. So far, the scrap tires are disposed merely into the waste dump as if a less valuable waste material. There is an idea to use scrap tires as construction materials. Geotechnical stability of the retaining structure made of the scrap tires are analyzed to obtain safety factor and reliable of the structure to stabilize the widening road in durable manner. The result of the research is that the utilization of scrap tires has fulfilled safety factor for long term about 1.46 without load seismic and 1.04 with load seismic.
EVALUASI PASCADIKLAT INDUSTRI PENGOLAHAN DAN PEMURNIAN MINERAL PPSDM GEOMINERBA TERHADAP PENINGKATAN KOMPETENSI ALUMNI PADA INDUSTRI SMELTER (LOKUS: SULAWESI TENGGARA) Imelda Hutabarat; Revi Timora Salajar
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6332.706 KB) | DOI: 10.58522/ppsdm22.v4i1.83

Abstract

The development of the processing and refining industry cannot be separated from the mandate of Law No. 4 of 2009 concerning Mineral and Coal Mining which requires domestically is obliged to process and refine minerals and coal in the country. There are still few schools that specialize in mining and metallurgy. Including high school (SMA) and vocational high school (SMK) still do not have a metallurgical curriculum. Thus there are competency gaps possessed by high school /vocational school students to enter metallurgical industries. Therefore, to reduce the competency gap possessed by high school / vocational school graduates in the locations around the smelter industry that are built, vocational training is needed to be able to provide the knowledge, skills and attitudes needed by high school/ vocational graduates to be accepted in the smelter industry. Post-Training Evaluation was carried out in Southeast Sulawesi province, where the rapid development of the smelter industry in this province. The results of the post-training evaluation specifically found that the practice time in the training was considered to be added. Even though it is quite a large amount of practice time allocated to education and training (50%), the skills provided are not too specific as those done in companies in South Sulawesi.
PENYELIDIKAN GEOLISTRIK TAHANAN JENIS UNTUK PENDUGAAN POTENSI AIR TANAH DI KAMPUS LAPANGAN PPSDM GEOMINERBA CIPATAT – PADALARANG Arif Budiyono; Antonius Alex Harmoko
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4932.772 KB) | DOI: 10.58522/ppsdm22.v4i1.84

Abstract

Availability of ground water at the PPSDM Geominerba Cipatat field campus - Padalarang is a problem that must be taken seriously enough and planned in order to improve services in the use of the field campus to support education at PPSDM Geominerba. Based on this, a study of the potential for groundwater availability has been carried out to overcome existing problems. One of the efforts made is to conduct a type of geoelectric resistivity investigation to illustrate the potential of groundwater in the field campus area. Measurement and data retrieval is done by Schlumberger (Vertical Electrical Sounding) and dipole-dipole (Profiling) configurations on 5 sounding points and 2 profiling lines. From the investigation conducted, it was found that the area lithology of the field campus was dominated by limestone, with the results of the interpretation obtained 3 main layers, namely: tuff, sand, clay tuff, and limestone. The lower limit of the limestone layer cannot be ascertained through this investigation due to the inadequate length of coverage factor both for sounding techniques and profiling techniques The location around the expected point of GL-3 is a more realistic place for groundwater extraction with a slight shift to the north. The thickness of the low resistivity layer that is not too thick is expected to provide enough contact area to allow storing and capturing more meteoric water besides the surface water collected in the porous layer.
ANALISIS GEOMORFOLOGI KAWASAN KAMPUS LAPANGAN PPSDM GEOMINERBA DAN SEKITARNYA Suryo Hespiantoro; Aperta Ledy Alam
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 4 No 1 (2019): Jurnal Geominerba 2019
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6777.829 KB) | DOI: 10.58522/ppsdm22.v4i1.85

Abstract

The PPSDM Geominerba Field Campus, is located in Gunung Masigit Village, Citatah Subdistrict, West Bandung Regency, West Java Province. The Campus lies on dominantly carbonate rocks area and cropout volcanic rocks at some other locations, that are formed different morphologies. The rocks composition and rocks physics are involving to constructed the morphology in this area. Based on the slope condition, landscape, and rocks composition, the landscape on PPSDM Geominerba Field Campus and it surrounding, divided into 2 (two) Geomorphology Units. First, Karst Morphology Unit (K2), 70% - 140% slope percent, very steep to almost vertical slope, and the area is constructed by dominantly coral limestone, and a littie bit of massive and crystalline limestones. Second, Denudational Geomorphology Unit (D2), 15% - 30% slope percent, moderately steep slope and the area is constructed by breccias and sandstone volcanic rocks, that reserved ground water or as aquifer layers in PPSDM Geominerba Field Campus and it surrounding. The result of this geomorphology study can be used for environment and geological hazards training materials.

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