JTK (Jurnal Teknik Kebumian)

Geologi dan Pola Sebaran Serta Kemenerusan Lapisan Batubara Menggunakan Metode Kontur Struktur di Desa Suo-Suo dan Sekitarnya Kecamatan Sumay Kabupaten Tebo Provinsi Jambi

Abdi Setiawan, D.M. Magdalena Ritonga, Gindo Tampubolon — Thu, 01 Feb 2024 00:00:00 +0700

Coal is a non-renewable natural resource. Coal has an important role in domestic and foreign energy resources. Coal is generally used in steam power plants (PLTU). In supporting the sustainability of coal energy, further exploration in coal development is needed. The research uses the required structural contour method with the aim of determining the distribution limits and direction of the continuity of the coal seam and only refers to the position of the coal seam and is applied to topographic maps. The observation location (LP) found in the research area contained 7 coal seams. Based on the criteria of the Indonesian National Standard (SNI), the number of outcrops that have a coal seam thickness above 1 meter are 2 outcrops with a thickness of 2.15 meters and 1.24 meters, respectively. The results of drawing the distribution pattern using the structural contour method based on the bottom of the coal seam, it is found that the direction of the distribution pattern is northwest-southeast. The continuity follows the direction of the hills and valleys based on a distribution pattern that is trending northwest-southeast with a developed control structure in the form of a pure rising fault. This is in accordance with the regional geological map of the study area with the direction of the continuity of the coal seam trending northwest-southeast. From the results of the distribution pattern and continuity, there are 2 coal outcrops that can be exploited with economic value.

EFISIENSI KINERJA ALAT GALI MUAT EXCAVATOR CAT 320 PC200 DAN ALAT ANGKUT DUMP TRUCK MITSUBISHI FUSO 220PS PADA KEGIATAN PENGUPASAN LAPISAN OVERBURDEN DI PERTAMBANGAN BATU KAPUR EFISIENSI KINERJA ALAT GALI MUAT EXCAVATOR CAT 320 PC200 DAN ALAT ANGKUT DUMP TRUCK MITSUBISHI FUSO 220PS PADA KEGIATAN PENGUPASAN LAPISAN OVERBURDEN DI PERTAMBANGAN BATU KAPUR

Muhammad El Hakim, Muhammad Husein.Zn, Jarot Wiratama, Ericson — Thu, 01 Feb 2024 00:00:00 +0700

Abstract : A limestone mining company in South Sumatra has an overburden removal target of 42,400 bcm/month, while the realization of overburden removal is only 21.7% of the target or 9,231.56 bcm/month. The tools used to dismantle the overburden were 1 Cat 320 PC200 excavator and 3 Mitsubishi Fuso 220PS dump trucks. The main work in this activity is digging, loading, moving, unloading, then returning to the initial activity and continuing to repeat. One of the reasons why the production target was not achieved was that the repetitive activities did not run optimally. Based on the cycle time of digging and hauling equipment observed in the field, the productivity of loading and digging tools was 128.98 bcm/hour, while the productivity value of hauling equipment was 15.018 bcm/hour. From the research results, it was found that the match factor of the current pair of units was 0.34, this is very far from ideal. For this reason, it is necessary to add 5 units of Mitsubishi Fuso 220PS dump trucks so that the match factor becomes 0.9. In this way, overburden demolition activities can run more optimally and production can be increased.

Keyword: overburden, limestone, productivity, match factor, cycle time

Identifikasi Sebaran Batubara Berdasarkan Nilai Resistivitas Batuan Konfigurasi Wenner Desa Sungai Buluh Kecamatan Muara Bulian Kabupaten Batanghari

Farnando Rahmat, Juventa Juventa, Nasri MZ, Muhammad Fajrin — Thu, 01 Feb 2024 00:00:00 +0700

Research on the distribution of coal based on rock resistivity values was carried out in the mining business permit area of PT Sentosa Prima Coal, in Sungai Buluh Village, Muara Bulian District, Batanghari Regency, Jambi Province. Data obtained from field measurements using geophysical methods. Geophysical data acquisition method used is the resistivity geoelectric method with the Wenner configuration. The rock characteristics in the research area in Sungai Buluh Village are the same as the rock characteristics of the Muara Enim formation. Where the layer content consists of clay rock, sandstone and subbituminous coal. The potential for coal is found on all trajectories seen from the resistivity value of 129-200 Î©m at a depth of Â± 21 meters with a thickness of 4-8 meters. Subituminous is considered a medium grade coal because of its relatively low / not very high thermal temperature. Subbituminous is coal that lies widely in the estuary Enim formation where Sungai Buluh Village is located in this formation.
Keywords: Coal, resistivity, formation, Subbituminus

Perencanaan Teknis dan Biaya Reklamasi Lahan Bekas Penambangan Batubara Pit 1 di PT Seluma Prima Coal, Desa Rangkiling, Kecamatan Mandiangin, Kabupaten Sarolangun, Provinsi Jambi

Lides Hafifa, Yosa Megasukma, Gindo Tampubolon — Thu, 01 Feb 2024 00:00:00 +0700

Coal is a fossil fuel derived from sedimentary rocks that can be burned and formed from organic deposits and formed through the coalification process. One of the open pit coal mining methods applied by mining companies in Indonesia is the open pit method. After mining activities in a pit are completed, the ex- mining land will leave openings. The openings are backfilled with material from the overburden in the pits that are mined next.. This study uses quantitative, descriptive, and interviews with the company. The use of this method, because in the future research will use data in the form of numbers and present data in a visual form that is processed from data modeling so that it is easy to understand. The planned reclamation area is pit 1 opening area. The total area of the plan for reclamation of former coal mining pit 1 is 11.43 Ha, with an area for revegetation that is 9.13 Ha, and the area for other uses is 2.3 Ha (roads and trench). In the implementation of reclamation activities, it is inseparable from the design of the reclamation plan and the calculation of the reclamation cost plan. The design for the reclamation of pit 1 was made using a topographic map of the research area and a map of the mine situation. The reclamation design carried out includes road geometry with a straight road width of 9 m, a bend road width of 16 m, and a road grade of 8% (4.6o); level geometry with a ladder angle of 45Â°, an overall angle of 13Â°, a width of 5 meters, and a height of 6 meters; the terrace design used is a garden terrace with a terrace width of Â± 1.5 m; and ditch construction with a width of 0.5 meters and a depth of 1 meter. The cost of the reclamation plan in the form of revegetation pit 1 to reclaim a land area of 9.13 hectares is Rp. 647,486,722 (six hundred forty- seven million four hundred and eighty-six thousand seven hundred and twenty-two rupiah). This cost includes the cost of land management, revegetation, and maintenance for 3 years.
Keywords: Reclamation, coal, cost

Pengkayaan Unsur Tanah Jarang Sc- Y Pada Endapan Laterit Pulau Sebuku Provinsi Kalimantan Selatan

M Fauzi Fauzi, Hari Wiki Utama, Yulia Morsa Said — Thu, 01 Feb 2024 00:00:00 +0700

Sebuku Island is located at the Maratus high physiography which has an ultramafic rock composition. Ultramafic rocks exposed on the surface will usually experience weathering caused by the influence of climate and rainfall such as on Sebuku Island. One of the products produced from the weathering of these ultramafic rocks is laterite deposits. Laterite contains ore minerals that have economic value including rare earth elements, especially Scandium (Sc) and Yttrium (Y). This study aims to determine the geological conditions, laterite characteristics, and the content of rare earth elements Scandium and Yttrium. The method used is a field survey using petrographic analysis, XRF (X-Ray Fluorescence), and ICP-MS (Inductively Coupled Plasma Mass Spectrometry). Based on the geomorphological analysis of the research area, there are two original forms, namely denudational origin, and fluvial origin, then this original form is divided into four landforms, namely weak undulating plains (D5), weakly wavy denudation (D6), lakes (F3). and Swamp (F4). The flow pattern that developed in the research area is Rectangular (R). The geological structure that develops in the study area is a fault with a general direction of Northwest-Southeast such as a left horizontal fault. Characteristics of laterite which has a thickness of 8-12 meters. Scandium (Sc) and Yttrium (Y) levels in the drill hole from the topmost layer from laterite (Limonite) to the bottom (Badrock), scandium are at 48-5.9 ppm and Yttrium levels are at 23-0.12 ppm and are richest in the lomonite zone.

Keywords: Enrichment, scandium and yttrium, laterite deposits

Model Persebaran Marmer Kompleks Gunung Kasih, Tanggamus,Lampung

Muhammad Wira Hidayatullah, Anisa Fissilmi, Calista Putri Arisya — Thu, 01 Feb 2024 00:00:00 +0700

Abstract: Lampung Region has a large number of marble potential in Indonesia. One of the potential marble areasin Lampung is located in Tanggamus Regency. This study aims to determine the characteristics of marble in the research area and its distribution so it is expected to be able to provide information about the distribution of marble in Tanggamus Regency,Lampung.The analysis uses field observation methods using geological trajectories. Petrographic analysis is used to determine the mineralogical composition and rock texture. In the research area,there are three rock units,namely marble,schist,and meta-quartz sandstone.In general,metamorphic rocks show foliation which indicates regional metamorphism control. The marble unit shows the origin rock of limestone which shows the appearance of two types of marble, namely foliated marble with adominance of calcite mineral, and foliated marble with schist domain composed of muscovite-epidote-quartz minerals,while for schist and meta-quartz sand stone units,the origin rock is in the form of siliciclastic sedimentary rock. The existence of layers in the original rock will make the formation of domains in metamorphicrocks. The general direction of foliation in metamorphic rocks is northwestâ€“southeast so that in searching for the marble domain, it can be traced through the direction of foliation.

Keyword: marble,distribution model,Gunung Kasih,Woyla Group

Analisis Kestabilan Lereng Highwall Pit Timur PT.Ciptakridatama Jobsite PT.Kuansing Inti Makmur ,Kecamatan Tanjujuhan ,Kabupaten Bungo, Provinsi Jambi.

Novrialdy Dwi Putra, Yudhi Achnopha, Aditya Denny Prabawa — Thu, 01 Feb 2024 00:00:00 +0700

PT Cipta Kridatama Jobsite PT Kuansing Inti Makmur conducts mining using the open pit mining methode. Slope stability is an important factor, because it involves issues of human safety (workers), equipment safety, and smooth production. The level of stability of the mine slope itself can be known after conducting geotechnical investigations which include geotechnical drillng, testing the physical and mechanical properties of rocks, including density, cohesion and phi. Based on the slope stability analysis using the Bishop method on the actual geometry for section A-Aâ€™, B-Bâ€™, C-Câ€™, D-Dâ€™, E-Eâ€™, F-Fâ€™, the safty values ranged for single slope 0,74 to 3,61 and for the overall slope 1,95 to 3,75. So that the geometry changes are made on the cross-section A-Aâ€™, B-Bâ€™, C-Câ€™, F-Fâ€™ and the safty factor value for the single slope ranges from 1,29 to 1,43 and the overall slope is 1,97 to 3,19. Stable slope conditions can increase the minimization of work accidents.
Keywords : slope stability, bishop, single slope, overall slope, recommendation.