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Jurnal Mineral
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Gedung Dharma Pengabdian, Fakultas Teknik Universitas Bangka Belitung, Kampus Terpadu UBB, Balunijuk Provinsi Kepulauan Bangka Belitung
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INDONESIA
MINERAL
Published by Universitas Bangka Belitung
ISSN : 25407708     EISSN : 2620729X     DOI : https://doi.org/10.33019/mineral.v6i2
Core Subject : Science, Social, Engineering,
Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology
The scientific journal called MINERAL is a scientific periodical publication of Mining Engineering Department , Bangka Belitung University, which is published every April and October in a year which the scope of Exploration (Geology and Geophysics), Geotechnical / Geomechanics, Minerba Processing, Minerba Management and Economics, Mining Environment, Reclamation and Post-Mining. This journal collaborates with Association of Indonesian Mining Professionals (PERHAPI) Center and Forum Komunikasi Program Studi Teknik Pertambangan se-Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 172 Documents
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Analisis Uji Kuat Tekan Uniaksial Batupasir Pada Formasi Pamaluan, Kecamatan Longikis, Kabupaten Paser, Provinsi Kalimantan Timur Musodiq Musodiq; Tommy Trides; Shalaho Dina Devy; Revia Oktaviani; Albertus Juvensius Pontus
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.3921

Abstract

The uniaxial compressive strength test was carried out to determine the value of rock strength. This research was conducted on sandstones in the Pamaluan Formation. The tests carried out in this study were physical properties tests, compressive strength tests and grain size tests on sandstones with a total of 30 samples on the physical properties test, 10 samples on the mechanical test and 500 gram grain size test at each point, the purpose of which is to determine the effect of porosity on the compressive strength of rock. In testing the physical properties carried out, the lowest and highest porosity values ​​were 17.27 and 22.91%. The results of the compressive strength test with the lowest and highest values ​​were 3.05 and 7.63 MPa. The grain size test results at points 1 and 2 are the same, namely fine sandstones with a percentage of 45 and 44%. From the results of research that has been done the value of porosity and grain size is very influential on the compressive strength test.
Analisis Sifat Mekanik Batuan Terhadap Kemampugaruan Bulldozer Dan Kemampugalian Excavator Untuk Mencapai Target Produksi Overburden PT Berau Coal Rosihan Pebrianto; Edwin Harsiga; Marwan Asof; Muhammad Dimas Thabrani
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.4089

Abstract

The research was conducted at Pit Q, PT Berau Coal with the aim of determining the productivity parameters of bulldozer ripping, excavator productivity, and factors affecting ripping activities on sandstone. The results showed that the material in pit q was sandstone which had a ucs value of 6.26 Mpa and a seismic velocity of 1751.63 m/s so the crossripping method was used so that the material was dismantled smaller. Based on ripper productivity, the relationship between the depth of penetration of the shank ripper and the speed of the bulldozer is obtained, productivity of the excavator is smaller if the space used by the ripper increases, so that the size of the material produced will be larger and the digging time of the excavator will increase. The influence of ripper activities is the depth of penetration that affects the speed of the bulldozer, the use of ripping space affects the digging time performance of the excavator too. Factors of the performance of the ripper are trapped material, ripper tip wear, and operator skills.
Evaluasi Kemiringan Jalan Tambang Terhadap Cycle Time Alat Angkut Pada Dump Truck Hino FG 235 JJ Tambang Batu Granit Di PT Aditya Buana Inter Kabupaten Bangka Fitra Adreansyah; Franto Franto; E.P.S.B Taman Tono
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.4094

Abstract

PT ABI is a private company engaged in the granite mining business using the open pit method. The problem encountered is that there is a slope of the mine road that does not comply with the standards set by the company, namely ≤ 8%, the slope of the mine road, which is not suitable, makes the truck to produce large rimpull, which affects the overall distribution time. This study aims to evaluate and optimize the dump truck cycle time obtained. This research begins by calculating the actual travel time on 2 dump trucks in 40 trips, conveyance A gets 493.72 seconds and conveyance B is 495.75 seconds, the actual travel time on the haul road segment exceeds ≥ 8%, i.e. in the B-C segment which has a grade of 8.86% with an average travel time of 20.38 seconds and in the C-D segment which has a grade of 10.51% with an average travel time of 37.91 seconds. Obtained circulation time decreased by 5 seconds from 494.73 seconds to 489.69 seconds with a percentage increase of 1.04% after optimization, meaning that the conveyance can transport 89 tons more of material.
Studi Studi Pengaruh Tingkat Getaran Tanah (Ground Vibration) Akibat Peledakan Terhadap Bangunan sekitar Pit 13 HW Vandrianus Felix Feto Nuwa; Revia Oktaviani; Harjuni Hasan; Tommy Trides; Albertus Juvensius Pontus
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.4085

Abstract

PT. PAMA is a company engaged in mining and is a contractor of PT. Indominco Mandiri which has been running since 1996. The work contract given is blasting, from blasting activities many impacts arise, one of which is ground vibration, therefore it is necessary to measure the level of ground vibration in the west block area where there are several critical areas in the form of buildings such as offices , solar (fuel oil) storage, and PT. Indominco Mandiri, where there have been complaints regarding large vibrations and the potential for diesel spills from fuel oil. In the study the peak vector sum (pvs) value produced in December 2022 was 1.57 mm/s with the closest distance of 785 meters and in January 2023 4.21 mm/s with a distance of 500 meters. The maximum use of explosives item for explosive holes in December 2022 and January 2023 is 2,513 kg. This pvs value is still safe, because it is still below 5.0 mm/s and according to SNI 7572: 2010.
Kajian Teknis Pengolahan SHP menggunakan Shaking Table untuk Mengoptimalkan Kadar dan Recovery Sn di TB Batu Besi PT Timah Tbk Kristina Damayanti Panjaitan; Janiar Pitulima; Delita Ega Andini
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.4096

Abstract

PT Timah Tbk carried out the development by establishing TB Primer Batu Besi, East Belitung. The purpose of this study was to find out the variable setting of the shaking table in order to obtain optimal levels and recovery of Sn. The research method used is gravity concentration using a shaking table tool. The feed used is Remaining Processing Results from the primary shaking table. The experiment was carried out twice, the first experiment was carried out 27 times with a sample weight of ± 78 kg. Each experiment used 9 variations, namely the tilt of the shaking table (8°;8.5°;9°) and the stroke length (12mm, 14mm, 16mm). The second experiment used ±5 tons of material with the most optimal tool settings from the first experiment. The feed sample material and product shaking table were tested using the XRF and GCA tests. The analysis of the XRF test showed that the Sn content in the feed was 0.45%. GCA analysis shows that the associated minerals are cassiterite, ilmenite, monazite, pyrite, quartz, tourmaline, hematite and magnetite. The optimal setting for the operating variable of the shaking table is with a variation of the tilt of the shaking table 8° and a stroke length of 12 mm to obtain a concentrated Sn content of 8.04% and a concentrated Sn recovery of 20.75%. The second experiment obtained a total Sn recovery of 17.25%. If one additional SHP processing line is added to TB Batu Besi, the company's recovery will increase from ±15% to ±29.55%.
Analisis Fuel Ratio Pada Project Penambangan di Pit 1 PT Cahaya Riau Mandiri Jobsite PT Duta Alam Sumatera Yunita Yunita; Edwin Harsiga
MINERAL Vol 8 No 1 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i1.4097

Abstract

This study analyzed the fuel ratio in mining projects to determine the factors that affected loose opportunity and the profit or losses encountered by the company. This analysis process was conduted by determining the target and realization of production where the overburden and coal getting production target in March on Fleet 1 was 68.885 bcm/month with the fuel consumption of 11.907,19 liter, on Fleet 2 was 70.944 tons/month with the fuel consumption of 11.460,38 liter, on Fleet 3 was 68.885 bcm/month with the fuel consumption of 9.611,94 liter, Fleet 4 was 68.885 bcm/month with the fuel consumption of 11.907,19 liter. Whereas, in the field the realization of overburden and coal getting production in march of Fleet 1 was 55.403,23 bcm/month, Fleet 2 was 51.907,52 tons/month, Fleet 3 was 18.259,34 bcm/month, Fleet 4 was 56.582,92 bcm/month. The planned fuel ratio on Fleet 1 was 0,17 liter/bcm, Fleet 2 was 0,16 liter/tons, Fleet 3 was 0,14 liter/bcm and Fleet 4 was 0,17 liter/bcm while the actual fuel ratio on Fleet 1 was 0,18 liter/bcm, Fleet 2 was 0,20 liter/tons, Fleet 3 was 0,16 liter/bcm, Fleet 4 was 0,18 liter/bcm and the fuel ratio difference on Fleet 1 was 0,01 liter/bcm, Fleet 2 was 0,04 liter/tons, Fleet 3 was 0,02 liter/bcm and Fleet 4 was 0,01 liter/bcm. The factors affecting the production loose opportunity from the tool working hour was breakdown, slippery, rain and wait other unit. The total cost spent by the company for the overall fuel consumption was Rp 428.989.792,00 while the overall loss was Rp 45.989.837,74 in March.
POTENSI LOGAM TANAH JARANG DI DALAM ABU BATUBARA Diana Purbasari; Rosihan Pebrianto; Edwin Harsiga
MINERAL Vol 8 No 2 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i2.4364

Abstract

Coal is a fossil fuel that is still used as fuel for Steam Power Plants (PLTU). The greater the demand for electrical energy, the greater the need for coal to meet the fuel needs of the PLTU. The combustion of PLTU produces combustion residue in the form of fly ash and solid ash. Fly ash has its own problem level compared to solid ash. The issue of air pollution, sources of disease and radioactive pollutants are the negative impacts of fly ash left over from burning coal. Coal ash is formed from compounds that do not burn in the coal combustion process including the presence of rare earth metals (LTJ). LTJ is a valuable element which in certain levels can be processed into valuable goods. Separation of LTJ in coal can reduce the ash content and improve the quality of coal, so it is necessary to know the potential of LTJ contained in coal ash. The coal sample tested was coal from PT Bukit Asam Tanjung Enim Mining Unit. Identification of LTJ elements in the ash at the PLTU using XRD, ICP and SEM analysis. There is element Cerium (Ce) 55.3 ppm in fly ash and 22.6 ppm in bottom ash, element yttrium (Y) 36 ppm in fly ash and 10.7 ppm in bottom ash, element Lanthanum (La) 27.3 ppm on fly ash and 10.5 ppm on bottom ash. Neodymium (Nd) 26.1 ppm in fly ash and 6.9 ppm in bottom ash. Finally, there is an element of Samarium (Sm) 1.4 ppm in fly ash and 0.7 ppm in bottom ash. There is a promising potential for rare earths in coal ash, but for levels below 500 ppm it is still not feasible to manage, so it is necessary to enrich the rare earths first.
Pengaruh Pre-roasting Terhadap Kinetika Leaching Fe dari Laterite Tipe Limonite Gyan Prameswara
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4567

Abstract

Extraction of valuable metals from laterite is intensified. The scarcity of sulfide sources containing high Ni and the use of pyrometallurgical processes with high capital costs are important reasons to initiate extraction of valuable metals from oxide minerals such as laterite and hydrometallurgical processes such as leaching. In this study, the effect of pre-roasting of limonite type laterite on Fe leaching kinetics parameters was observed. Roasting was carried out at 280 °C and 610 °C to transform the geotite phase into hematite and dehydroxylate Mg-Si associated minerals. Roasting was carried out for 4 hours in a muffle furnace. Non-roasted and roasted ore were then leached at a temperature range of 30-90 °C at a time variation of 0 to 240 minutes using sulfuric acid at a concentration of 2M, S/L ratio of 10 g/100 mL, and rotating speed of 200 rpm. Roasted ore (280 °C) showed better leaching performance than non-roasted ore while increasing the roasting temperature to 610 °C did not provide a significant increase in Fe recovery. Kinetic parameters such as activation energy (EA) and frequency factor were also reduced by using roasted ore. An EA value of 31.66 kJ/mol was obtained in the leaching process using 280 °C roasted ore. The leaching process is confirmed to be controlled by diffusion through the product layer with the following kinetic equation kt=31.59 exp (-31.66/(RT))t=1-2/3X-(1-X)^(2/3).
Optimalisasi Waktu Hambatan Excavator Untuk Mencapai Target Produksi Batubara Pit C CV Kutai Kumala Energy Henny Magdalena; Fransiska Yuniari Saksono
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4677

Abstract

The barriers on the activity causes losstime. The losstime of excavator that so high cause coal production targets not to be achieved. Therefore efforts are made to improve the losstime. The analysis of multiple linear regression multivariate is used as a problem solving approach, namely finding the maximum limit of idle time and delay time and formulating the optimal losstime. Based on observations of the idle time and delay time of two excavator units operating in the morning shift, the regression equation is obtained Y = 1832.782 – 95.134X1. The equation of optimal losstime is X2 = -0.8729X1 + 10.71. The simulation is carried out based on the average actual data, the maximum idle time limit of 6.67 hours and a delay time of 4.89 hours. For an idle time of 4.45 hours, it is expected that the delay time will not exceed 6.83 hours in order to achieve the production target. The causes of unfulfilled of production were include rain, landslides, breakdown units, slippery, operator needs and et cetera.
Analisis Kuat Tekan Dan Penyerapan Air Menggunakan Pasir Tailing Timah Dan Kaolin Ummi Athiyyah Zikri; Endang Setyawati Hisyam
MINERAL Vol 8 No 2 (2023): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v8i2.4693

Abstract

The environmental damage resulting from mining not only eliminates soil fertility but changes the landscape of the existing ecosystem and produces waste such as tailings and kaolin and understory. The results of tin and kaolin tailings mining have not been utilized optimally. This research aims to analyze the effect of using tin tailings sand and kaolin on bricks which produces compressive strength and water absorption in accordance with standards. The method used is to take tin and kaolin tailings mixed with clay with a predetermined composition and tested in the laboratory. Based on the test results, the compressive strength value obtained meets the standards, namely the percentage of 15% tin tailings sand and 10% kaolin, the compressive strength value is 5,150 Mpa. The water absorption value using percentages of 5%, 10% and 15% tin tailings sand and 10% kaolin has met the specified standards.

Page 10 of 18 | Total Record : 172

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