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All Journal GEA, Jurnal Pendidikan Geografi Jurnal Geomine Journal of Earth and Marine Technology (JEMT)
Budhi Setiawan
Sriwijaya University
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Physics Transportation

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Determination Of Relative Error in Coal Resource Classification Based On Geostatistical Drill Hole Spacing Analysis: A Case Study of Coal Deposits at Batang Hari, Jambi Muhammad Fadhli; Budhi Setiawan
Jurnal Geomine Vol 10, No 2 (2022): Edisi Agustus 2022
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v10i2.1257

Abstract

Generally, the determination of resource classification is only qualitative based on the geometric factors and geological complexity that control it. However, as the prospect area is found to have a reasonably heterogeneous sediment characteristic, a method is needed that can be used to increase the level of confidence in determining the Optimum Drill Hole Spacing. Therefore, this study uses the application of geostatistics with the global estimation variance (GEV) method based on the relative error value of each parameter, namely the thickness geometry and quality in the form of Ash and VM. This research was carried out in Jangga Aur village, Bathin XXIV District, Batang Hari Regency, Jambi Province, Working Area of PT Berkat Bara Persada Jobsite PT Inti Bara Nusalima.The Drill Hole Spacing Analysis (DHSA) results will obtain optimum spacing on resource classification based on relative error values, namely 0-10% for measured resources, 10-20% for indicated resources, and 20% for Inferred resources carried out the on-seam reference. Based on the results of the study, it was found that the seam reference used was Seam D, then the spacing distance of the drill hole on the coal seam of the research area, which had an average distance of 80 m, with geostatic analysis could be increased up to a distance of 250 m in measured resources, indicated resources of 450 m and Inferred 800 m.
Surface Deformation Analysis Using Differential Interferometry Synthetics Aperture Radar in Rumpin, Cigudeg, Leuwiliang, and Cibungbulang District Period 2018-2022 Rosse Violla Rosendrya; Budhi Setiawan
Jurnal Pendidikan Geografi Gea Vol 23, No 2 (2023)
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v23i2.61152

Abstract

Ground movement is surface movement resulting from natural events such as landslides, earthquakes, slumping, or surface runoff. Tracking ground movement is a step in mitigating and investigating unexpected natural disasters. Administratively, the research area is in Bogor Regency, namely Rumpin, Cigudeg, Leuwiliang, and Cibungbulang Subdistricts. The area studied by the author is 9 x 9 km². The method uses more than one interferogram to capture surface topographical transformations accurately. The DInSAR method aims to extract the total phase caused by deformation by eliminating or reducing other contributing things. This study identified material movements in the form of decreases or increases. The activity of monitoring material movement is considered essential to be carried out in monitoring potential landslides in the future. SAR imagery can be used as an early warning for disaster mitigation which still requires further action, such as taking data directly to the field in the hope of getting more accuracy.
Geomorphological Study of the Samigaluh Area and Its Surroundings, Kulon Progo Regency, Yogyakarta Fadea Risa Azzahra; Budhi Setiawan
Journal of Earth and Marine Technology (JEMT) Vol 6, No 1 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v6i1.8650

Abstract

Samigaluh District and its surrounding areas, Kulon Progo Regency, Special Region of Yogyakarta, form part of the Kulon Progo Mountains, which lie within the eastern segment of the Southern Serayu Mountains zone. This region exhibits complex geomorphological conditions resulting from the interaction of tectonic activity, volcanism, and ongoing denudational processes. This study aims to provide knowledge and benefits for relevant stakeholders and readers, thereby supporting related scientific fields and areas of expertise. The research method involved field observations combined with analyses using Geographic Information Systems (GIS) and Digital Elevation Model (DEM) data. Geomorphological characteristics were analyzed by correlating drainage patterns, slope gradients, and lithological units to identify landform features within the study area. The results indicate that the geomorphic units in the Samigaluh area consist of Volcanic Denudational High Hills, representing remnants of ancient volcanic edifices that have undergone prolonged weathering and erosion over geological timescales; Intrusive Hills, formed by the intrusion of igneous rocks into surrounding strata and subsequently exposed by erosion; and Karst High Hills, which developed predominantly through carbonate dissolution processes. The diversity of these geomorphic units reflects the strong influence of geological dynamics on the landscape evolution of the study area.
Co-Authors Fadea Risa Azzahra Muhammad Fadhli Rosse Violla Rosendrya