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All Journal Bulletin of Scientific Contribution : Geology KURVATEK
Hartono, Hill G.
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Social Sciences

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The THE EFFECT OF GEOLOGICAL STRUCTURES ON THE COAL QUALITY OF THE SEMBAKUNG FORMATION IN BERAU REGENCY, EAST KALIMANTAN Sugiarto, Wahyu; R. A., T. Listiyani; Hartono, Hill G.; Budiadi, Ev.
KURVATEK Vol 9 No 1 (2024): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v9i1.4894

Abstract

The Subsurface coal resources are 43.533 billion tons with total reserves of 173.51 million tons. The Berau Regency area has coal-bearing formations of the bituminous - sub bituminous type, namely the Latih Formation, Labanan Formation, Domaring Formation, Sajau Formation and Sembakung Formation. The research methods used are surface geological mapping, rock sampling and drilling. The analysis used is coal quality and geological structure. The results of analysis of changes in the dip of rock layers caused by geological structures in the form of folds and thrust faults can cause changes in coal quality. The dip of coal seam in the LP 54 outcrop sample is 24º, which has lower coal quality compared to LP 38 that has a seam dip of 65º. The quality of coal in LP 38 seam position N 203º E/65º has a calorific value of 6,393 Kcal/kg, while in LP 54 seam position N 30º E/24º has a calorific value of 4,888 Kcal/kg. At the drill point, location MMA_19-T has better coal quality compared to MMA_18-T and MMA_20-T, this is because the seam in MMA_19-T experienced folding accompanied by faulting with a calorific value of 7326 Kcal/kg.
KARAKTERISTIK GEOMORFOLOGI GUNUNG API AKTIF DAN GUNUNG API PADAM: KASUS G. MERAPI & G. GAJAHMUNGKUR, DAERAH ISTIMEWA YOGYAKARTA DAN JAWA TENGAH Hartono, Hill G.; Sudradjat, Adjat
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1181.215 KB) | DOI: 10.24198/bsc.v16i2.18383

Abstract

The volcanic morphology provides the information about the history of the genesis and activities of an active volcano which is still developing as demonstrated by Merapi strato volcano in Special Provinve of Yogyakarta and Central Java. The purpose of the present study is to reveal the history of the geomorphology of the dormant volcano (such as Gajahmungkur volcano, Wonogiri) based on the comparative study of the active volcano (Merapi volcano, Yogyakarta). The method in this study is the application of geological principle “the present is the key to the past” in the geology of a volcano. In general the volcanological facies concept reflects the ideal morphology of Merapi volcano. The central facies with the slope of 300 to 400 and the smooth surface; medial facies with the slope of 200 to 300 reflecting rough surface and the distal facies manifested in a relatively flat angle between 100 to 200 where the deposition of volcanic materials and lahar takes place. The boundary between the facies is delineated by a break in slope which also reflects the radial drainage pattern and the boundary of vegetation
Co-Authors Adjat Sudradjat Budiadi, Ev. R. A., T. Listiyani Wahyu Sugiarto