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Journal of Engineering Science and Technology Applications
Published by CV. Insight Publisher
ISSN : -     EISSN : 29884624     DOI : https://doi.org/10.58227/jesta.v1i1
Core Subject : Engineering,
Engineering
Journal of Engineering Science and Technology Applications (JESTA) E-ISSN 2988-4624 is a peer-reviewed journal that aims to publish and disseminate original research articles on the latest developments in all fields of engineering science and technology applications. The journal publishes original papers contributing to understanding engineering science and improving technology and engineering education. The articles can be theoretical (including computational), experimental, or both. Published by Insight Publisher located in Makassar City, Indonesia. JESTA invites researchers, investigators, and students to contribute their studies and research by submitting original articles and not simultaneously submitting articles to other journals or conferences. The journal covers topics related to engineering fields in bioelectrical engineering, electronic engineering, informatics engineering, computer science, mechatronics engineering, mechanical engineering, automotive engineering, construction engineering, industrial engineering, chemical engineering, mining engineering, environmental engineering, engineering, applied technology, and other engineering fields.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 30 Documents
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Perhitungan Biaya Produksi Alat Muat dan Angkut di Pit Mudak PT Teknik Alum Service: Calculation Of Production Cost Of Loading And Hauling Equipment At Mudak Pit Of PT Teknik Alum Service Lantapi, Adriansyah Wuriadin Lantapi; Audina P Alhabsyi, Gina; Bundang, Syarifullah; Pakombong, Vhalentio; Winarno
Journal of Engineering Science and Technology Applications Vol. 3 No. 1 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i1.212

Abstract

PT Teknik Alum Service is a company that mines nickel ore located in Buleleng.Village, Bungku Pesisir District, Morowali Regency, Central Sulawesi Province. The costs of loading and transporting nickel from the mine to the jetty using loading and transportation equipment are carried out to determine the components of production operating costs. Production costs are costs incurred during the production process. To produce large tool productivity for the company, of course, it is necessary to calculate the production costs of using the tool based on the production target plan that has been determined by the company. From this identification, the objectives of this research are asFollows: a. find out how much loading and conveyance equipment is produced at the Mudak Pit, b. Find out how much the production costs of loading equipment and conveyance are profitable for the company. PT Teknik Alum Service Teknik Alum Service has a monthly production target of 50,000 tons/month.  
Studi Pemisahan Bijih Mangan dari Paludda Daerah Barru Menggunakan Shaking Table dengan Variasi Ukuran Butir: Separation Study of Manganese Ore from Palludda Barru Region Using Shaking Table with Variation of Grain Size Fraction Bakri, Suriyanto; Ratmi Nurhawaisyah, Sitti; Nurmalasari; Iksan, Muh.; Prayitna, Yusri; Putri, Syukrika
Journal of Engineering Science and Technology Applications Vol. 3 No. 1 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i1.217

Abstract

Manganese is one of the mineral products of mining, especially those found in Indonesia, such as in the Paludda area of Barru Regency, South Sulawesi. Manganese ore is known as raw material for steel industry, battery industry and chemical industry. This research was conducted at the Mining Engineering Study Program's Materials Processing Laboratory. The purpose of this study was to determine the percentage increase in manganese ore content after the concentration process, determining the recovery of manganese ore against variations in grain size using a shaking table. The analysis used in this research includes shaking table equipment, XRF analysis and also XRD analysis, from this processing will be obtained Mn content. The results of this study show shaking table separation using operating variables with an initial sample weight of 500 grams with levels in the initial sample of MnO of 33.58%, in concentrate -65 of 26.60%, concentrate -100 of 25.93%, concentrate -150 of 25.46%, concentrate -200 of 26.93%, in tailings -65 of 24.17%, tailings -100 of 23.79%, tailings -150 of 22.79% and tailings -200 of 22.60. Therefore, the results of the study can be concluded that the shaking table operation obtained the optimal concentrate and tailings in the -150 MnO concentrate with a recovery of 23.65%, then the -100 MnO tailings with a recovery of 38.68%
Studi Kualitas Silika Menggunakan Metode Geokimia Daerah Tahi Ite Kabupaten Bombana, Provinsi Sulawesi Tenggara: Silica Quality Study Using Geochemical Method in Tahi Ite Area, Bombana Regency, Southeast Sulawesi Province Almarabi, Laode Muhammad Imaduddin; Bakri, Hasbi; Thamsi, Alam Budiman
Journal of Engineering Science and Technology Applications Vol. 3 No. 1 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i1.218

Abstract

Silica is a rock weathering mining material containing the main mineral, silica (SiO2). Quartz sand is widely used in Indonesia, such as in the glass industry, cement industry, refractory bricks, and as a furnace coolant. The purpose of the study was to determine the carrier minerals of quartz sand and associated minerals in the Tahi ite area of ​​Bombana Regency, to determine the geochemical composition of quartz sand, and to determine the quality of quartz sand based on the Indonesian National Standard (SNI). The location of this study is in Southeast Sulawesi Province, Bombana Regency. This research method uses XRD (X-ray diffraction) analysis and XRF (X-ray fluorescence) analysis which has Quartz (SiO2), Calcite (CaO3), Muscovite (Al3HKO12Si3), Kaolinite (Al2H4O9Si2), Albite (AlNaO8Si3), Chabazite (CaK2Na2Mg). Silica deposits have elements (SiO2) 46.50% and Aluminum Oxide compounds (Al2O3) 24.33% and have larger elements (SiO2) 58.28% and Aluminum Oxide compounds (Al2O3) 25.80%.
Analisis Kepadatan Lapis Pondasi Kelas A Terhadap Nilai CBR Soaked Pada Jalan Parkir Proyek Rehabilitasi dan Renovasi Stadion Gelora B.J Habibie: Analysis of Class A Base Layer Compaction on Soaked CBR Value In The Parking Road of the Rehabilitation and Renovation Project of Gelora B.J Habibie Stadium Munadrah; Firman, Risman; Febry Fitriani Sofyan, Yanny; Tamsil Yunus, Ahmad; Satar, Syahrul; Limbongan, Joey; Widiasari Maruddani, Andi
Journal of Engineering Science and Technology Applications Vol. 3 No. 1 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i1.221

Abstract

The compaction of the base layer plays a crucial role in enchancing soil bearing capacity for pavement construction. This studi aims to analyze the effect of varying compaction blows on the soaked California Bearing Ratio (CBR) value of Class A base layer in the Rehabilitation and Renovation Project of Gelora BJ.Habibie Stadium. The tests were conducted with three compaction variations: 10,25, and 56 blows. The result indicate that an increase in the number of blows correlates with a higher CBR value, where a CBR of 51,33% was obtained with 10 blows, increasing to 67,37% with 25 blows, and reaching 98,38% with 56blows. These finding confirm that compaction can significantly improve soil bearing capacity and pavement stability.
Kajian Teknis Hidrologi dan Hidrogeologi pada Kegiatan Penambangan Nikel di Wilayah IUP PT PS, Kabupaten Kolaka, Sulawesi Tenggara: Hydrogeological and Hydrological Technical Assessment of Nickel Mining Operations at PT PS, Kolaka, Southeast Sulawesi Farsan, Adwil Rilansyah; Dzakir, La Ode; Amir, Muhamad Karnoha
Journal of Engineering Science and Technology Applications Vol. 3 No. 1 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i1.224

Abstract

This hydrology and hydrogeology study was conducted to analyze the water resource conditions within the Mining Permit Area (IUP) of PT PS, located in Pomalaa District, Kolaka Regency, Southeast Sulawesi. The study aims to assess rainfall characteristics, runoff discharge, erosion potential, aquifer conditions, and to formulate technical recommendations for mine water management. The data used includes 10-year historical rainfall records, field measurements, geoelectrical surveys, and modeling of discharge and drainage systems. The results show that the site experiences high rainfall with a peak runoff discharge of 96.7 m³/s for a 10-year return period. A shallow aquifer was identified at a depth of 20–30 meters, with an average groundwater level of 20 meters. The recommended infrastructure includes surface drainage channels, sump pits, and settling ponds to manage runoff and mine water efficiently. The study concludes that mining activities in the area are technically feasible, provided that water management systems are implemented in accordance with applicable standards and regulations.
Pengaruh Arus Pengelasan Smaw pada Dissimilar Logam Stainless Steel 201 dan Baja 1040 Terhadap Sifat Mekanik dan Struktur Mikro: The Effect of Smaw Welding Current on The Mechanical Properties and Microstructure of Dissimilar Metals Stainless Steel 201 and Aisi 1040 Steel Hadi, Qomarul; Matondang, Ifsya Ussalam; Zamheri, Ahamad
Journal of Engineering Science and Technology Applications Vol. 3 No. 2 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i2.237

Abstract

The advancement of welding technology plays a crucial role in industrial development, especially in dissimilar metal welding, such as joining stainless steel 201 and carbon steel 1040. This type of welding often results in reduced mechanical properties at the joint due to differences in composition and physical characteristics. This study aims to investigate the effect of welding current variations on the tensile strength, hardness, and microstructure of dissimilar metal joints between stainless steel 201 and AISI 1040 steel. The welding method used is Shielded Metal Arc Welding (SMAW) with current settings of 85A, 90A, 95A, and 100A. Tests performed include tensile testing (ASTM E8M), hardness testing (JIS B 7725), composition analysis, and metallographic examination (ASTM E407-07). The results show that 95A is the most optimal current, producing the highest tensile strength and hardness values, particularly in the Heat Affected Zone (HAZ). Lower currents (85A and 90A) lead to insufficient penetration and fusion, a current of 100A generates the highest heat among all tested values. Composition analysis shows that stainless steel 201 primarily contains Fe, Cr, and Mn, while AISI 1040 is mostly composed of Fe. Variations in welding current also affect the microstructure, with the formation of phases such as widmanstätten ferrite and acicular ferrite, which significantly influence the mechanical properties of the welded joint.
Studi Losstime pada Kegiatan Produksi Pengupasan Tanah Penutup Pit Diamod PT Ceria Jasatambang Pratama: Study Of Lost Time in the Production Activities of Cover Soil Stripping at The Diamod Pit of PT Ceria Jasatambang Pratama Ningsih, Apriyana; Thamsi, Alam Budiman; Firdaus
Journal of Engineering Science and Technology Applications Vol. 3 No. 2 (2025): Journal of Engineering Science and Technology Applications
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i2.296

Abstract

PT Ceria Nugraha Indotama, precisely in the diamond pit managed by the contractor PT Ceria Jasatambang Pratama, there are 2 overburden stripping fleets, based on the production target data for March 2025, fleet 1 is 7,731 Bcm and fleet 2 is 3,257 Bcm with actual production of fleet 1 being 4,243.29 Bcm and fleet 2 being 5,365.00 Bcm. This research aims to find out the value and what are the losstime components of the load excavation tool in the overburden soil stripping activity at pit diamond 01 and pit diamond 02 of PT Ceria Jasatambang Pratama in March 2025. This activity is very important to support the smoothness of the nickel ore mining process. The research was conducted with field observation methods as well as primary and secondary data processing using microsoft excel software. The results of the study showed that the actual loss of time that was identified came from five main components, namely: rain and slippery roads (slippery), late starting work early shifts, breaks that started too early, delays in returning to work after a break and stopping work too early. Total losstime for one month in fleet 1 was recorded as 65 hours (average 2,2 hours per month), while fleet 2 was 60 hours (average 2,00 hours per month). This value shows that most of the effective working time is wasted due to these obstacles. The actual productivity of each fleet is calculated based on work efficiency, cycle time, swell factor and fill factor. Fleet 1 produces productivity of 812,25 tons/day and fleet 2 of 1,410,05 tons/day. This result shows the non-achieval of the production target in fleet 1, which is caused by the difference in bucket capacity on the loading and unloading equipment and the high loss time value. Suggested loss time reduction efforts include improving work discipline, implementation of P5M activities (five-minute talk), daily inspection (P2H), and regulation of refueling and slippery activities. This research is expected to be the basis for decision making in improving the operational efficiency of overburden mining. The average monthly value for fleet 1 was 2.2 hours with the losstime component being influenced by taking breaks too early, while for fleet 2 it was 2.00 hours, with the most influential losstime component consisting of starting late after a break.
Karakteristik Mineralogi Batubara Desa Tiktok Kecamatan Baraka Kabupaten Enrekang: Mineralogical Characteristics of Coal in Tiktok Village, Baraka District, Enrekang Regency Firaldy S; Budiman, Agus Ardianto; Thamsi, Alam Budiman
Journal of Engineering Science and Technology Applications Vol. 3 No. 2 (2025): Journal of Engineering Science and Technology Applications
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i2.297

Abstract

Coal is a solid, combustible sedimentary rock formed from the decay of ancient plants. Coal is brown to black in color and undergoes physical and chemical changes that increase its carbon content. The purpose of this study was to determine the mineral composition of the coal in the area. The sampling method used channel sampling, based on research conducted using XRD, obtained results: the upper sample was composed of quartz (69.8%), graphite (30.2%), the middle sample was composed of quartz (37.6%), graphite (33.8%), and albite (28.8%), and the lower sample was composed of albite (41.2%), quartz (30.0%), and graphite (28.8%).
Studi Desain Disposal Dan Perhitungan Kapasitas Out Pit Dump 3 Kabupaten Barito Selatan Provinsi Kalimantan Tengah: Disposal Design Study and Capacity Calculation of Out Pit Dump 3 in South Barito Regency, Central Kalimantan Province Rachman, Muhammad Fathur; Nurwaskito, Arif; Thamsi, Alam Budiman
Journal of Engineering Science and Technology Applications Vol. 3 No. 2 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i2.298

Abstract

Disposal is an area designed and planned to accommodate overburden material from mining activities. The objective of this study is to create a disposal design and determine its design volume capacity. The research methodology applies a technical approach, such as processing topographic data as the basis for design, utilizing the situational map of the disposal area as a reference, and considering production targets. Based on the conducted study, a disposal design was developed from the lowest to the highest elevation, starting from the requested elevation of 80 up to the peak design at elevation 120. The calculation of the design volume capacity resulted in a total of 11,410,645 Bcm, obtained from each design stage by elevation.
Analisis Kualitas Batubara Berdasarkan Analisis Proksimat, Total Sulfur dan Kalori di Site Jhonlin Group PT Tribhakti Inspektama: Coal Quality Analysis Based on Proximate Analysis, Total Sulfur and Calories at the Jhonlin Group Site, PT Tribhakti Inspektama Bakri, Suriyanto; Widodo, Sri; Arifin, Mubdiana; Ardana, Rifal
Journal of Engineering Science and Technology Applications Vol. 3 No. 2 (2025): Journal of Engineering Science and Technology Applications
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jesta.v3i2.299

Abstract

Coal is one of the fossil energy sources that remains the backbone of national energy needs, especially in the power generation and processing industries. The quality of coal greatly determines its economic value and efficiency of use, so a comprehensive analysis of coal characteristics is needed to determine its suitability for industry specifications and end-user requirements. PT Tribhakti Inspektama, as an independent inspection agency operating in the Jhonlin Group's working area, plays an important role in testing and monitoring the quality of coal to be marketed. This study aims to analyze coal quality based on the results of proximate analysis, total sulfur content, and calorific value in the Jhonlin Group mining area. The research method was carried out by taking coal samples from the stock file, preparing them, and analyzing them in the laboratory. The results of the study show that the proximate analysis of the samples was 4.13% ash, 20.87% moisture content, 42.21% volatile matter, and 32.77% fixed carbon. The coal in the study area is categorized as lignite with a low to sub-bituminous rating, so it still has the potential to be used for the cement industry and coal-fired power plants.

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