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Buletin Sumber Daya Geologi
Published by Pusat Sumber Daya Mineral Batubara dan Panas Bumi
ISSN : 19075367     EISSN : 25801023     DOI : -
Core Subject : Science, Education, Social, Engineering,
Education Energy Engineering Environmental Science
uletin Sumber Daya Geologi merupakan Makalah berkala ilmiah terakreditasi LIPI bidang mineral, energi fosil, dan panas bumi. Makalah ini terbit tiga nomor dalam satu tahun pada bulan Mei, Agustus dan November. Pada Tahun 2010, Buletin Sumber Daya Geologi mendapat Akreditasi B sebagai majalah Berkala Ilmiah, kemudian akreditasi ulang Tahun 2012, dan akreditasi terbaru di Tahun 2015 untuk tiga tahun kedepan dengan nomor ISSN (print) : 1907-5367. Tahun 2017 Buletin Sumber Daya Geologi mendapatkan nomor eISSN : 2580 - 1023 untuk versi onlinenya.
Arjuna Subject : -
Articles 751 Documents
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ANALISIS PENGINDERAAN JAUH DAN PEMODELAN 3D FAULT FRACTURE DENSITY (FFD) DALAM PENENTUAN ZONA PERMEABILITAS PERMUKAAN DI WILAYAH PANAS BUMI GUNUNG TAMPOMAS, JAWA BARAT: REMOTE SENSING ANALYSIS AND 3D FAULT FRACTURE DENSITY (FFD) MODELING INTO DETERMINATION OF SURFACE PERMEABILITY ZONES IN MOUNT TAMPOMAS GEOTHERMAL AREA, WEST JAVA Adi, Abizar; Haryanto, Agus Didit; Hutabarat, Johanes; Gentana, Dewi
Buletin Sumber Daya Geologi Vol. 16 No. 2 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i2.325

Abstract

The area of Mount Tampomas which is located in Buahdua District, Conggeang District, and Tanjungkerta District, Sumedang Regency, West Java was chosen as the research area because it is predicted to have geothermal potential with the presence of geothermal manifestations such as hot springs. The presence of manifestations relates to permeable zones controlled by geological structures. The lineament of the ridge and valley was observed and analyzed using ASTER GDEM remote sensing imagery and Indonesia Earth Form map (RBI), scale 1:25.000. The purpose of the study is to find out the relationship between permeability and the presence of geothermal manifestations in the research area. Research method by conducting remote sensing and fault fracture Density (FFD) analysis using 3D micromine software modeling. Results of remote sensing analysis with irradiation angle of 0°, 45°, 90°, 135° and altitude 45° shows the main pattern of the ridge - valley lineament interpreted as a fault in the research area have a relatively northwest-southeast and northeast-southwest direction. Indications of geological structures in the field are shown by the morphology of valley-ridges, in some places has a steep slope that form the fault escarpment and triangular facet. The FFD analysis results in the research area have varying permeability classes shown by low FFD values (0.00–3.00 km-1), medium (3.00-6.00 km-1) and high (6.00–9.33 km-1). The geothermal manifestations appear in the permeability zone that have medium to high FFD values marked by orange and red colors. From 3D micromine software modeling of the permeability zone and plotting of hot springs on the surface, it is clear that the appearance of hot springs to the surface is facilitated by faults that develop in the research area.
EVALUASI PENDAHULUAN POTENSI UNDERGROUND COAL GASIFICATION DI CEKUNGAN SUMATRA SELATAN: STUDI KASUS BATUBARA FORMASI MUARA ENIM: A PRELIMINARY EVALUATION OF UNDERGROUND COAL GASIFICATION POTENTIAL IN THE SOUTH SUMATRA BASIN: A CASE STUDY OF THE MUARA ENIM COAL FORMATION Dwitama, Eska Putra; Ramdhani, M. Rizki; Ulfa, R. Maria
Buletin Sumber Daya Geologi Vol. 16 No. 2 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i2.326

Abstract

The Underground coal gasification (UCG) is one approach to make use of deep-seated coal by converting it to a more environmentally friendly gas. The South Sumatra Basin is one of Indonesia's productive coal basins. The objective of this study is to find a suitable coal deposit for the development of UCG. Characterizing the coal seams is used to evaluate the potential of Indonesian coal for UCG development in this area. Coal from the Bayung Lencir, Muara Kilis, and Srijaya Makmur areas were evaluated to see if there was any possibility for UCG in these coals. Coal rank, coal thickness, slope and depth of coal seams, the ratio of depth and thickness of coal seam, type of floor and roof rocks and their thickness, hydrogeological conditions (position of coal against aquifers), geological structure, and coal resources were among the parameters evaluated. Based on the parameters of the coal, the evaluation results reveal that Bayung Lincir is suitable area for UCG development.
ANALISIS CITRA SATELIT LANDSAT 8 DAN DEMNAS UNTUK IDENTIFIKASI PROSPEK PANAS BUMI DI KABUPATEN ACEH TENGAH, PROVINSI ACEH: LANDSAT 8 AND DEMNAS IMAGES ANALYSES TO IDENTIFY GEOTHERMAL PROSPECT IN CENTRAL ACEH REGENCY, ACEH PROVINCE Husin Setia Nugraha; Lano Adhitya Permana; Sukaesih
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.322

Abstract

Combined analyses of Landsat satellite image and Digital Elevation Model Nasional (DEMNAS) are used to identify geothermal prospect areas. The analyses are applied in Aceh Tengah Regency because the information of springs exists in the regional geological map of Takengon. Two methods are applied to DEMNAS, namely the FFD method and circular features visual interpretation. Land Surface Temperature (LST) and Direct Principal Component Analysis (DPCA) methods are employed on Landsat 8 image. The appearance of circular features, anomalies of LST, and the existence of high-temperature mineral indicators are used to predict heat source indication. In addition, the FFD method is employed to indicate high permeability zones. The research shows that heat source indication is predicted at Mt. Telege Volcanic Complex within the District of Atu Lintang. The heat source is indicated by circular features appearance and LST anomalies within the area. Furthermore, the FFD method reveals an outflow zone near the hot spring of the northern part of Mt. Telege. In addition, the implementation of the DPCA method could not clearly separate between advanced argillic dan propylitic zones from their mineral indication values. It is due to mixing values among several mineral indicator values within the same pixel. In general, the application of the remote sensing method in Aceh Tengah Regency could help to indicate an early possibility of geothermal system exist within the area.
STUDI POTENSI TERBENTUKNYA CEBAKAN MINERAL RADIOAKTIF PADA BATUAN GRANITIK DI PULAU SULAWESI: THE STUDY ON THE POTENTIAL OF RADIOACTIVE MINERAL DEPOSITS FORMATION IN GRANITIC ROCKS IN SULAWESI ISLAND Ngadenin; Widodo; Fauzi, Rachman; Pratiwi, Fadiah
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.331

Abstract

In the Island of Sulawesi, there are many granitic rocks which have potential for containing radioactive mineral deposits. The purpose of this study is to determine the type of radioactive mineral deposits based on radioactivity, uranium grade, and mineralogy characteristics of certain granitic rocks. The data used comprise radioactivity measurement, uranium content, megascopic and petrographic observations of rocks, and grain analysis of heavy mineral of granitic rocks from uranium exploration on the island of Sulawesi. The granitic rocks consist of granite, biotite granite, granodiorite, biotite granodiorite, hornblenda granodiorite, hornblenda biotite granodiorite, biotite hornblenda granodiorite, biotite adamelite, hornblenda biotite adamelite, biotite hornblenda diorite, diorite, biotite hornblenda diorite and syenite. The radioactivity of granitic rocks is 50 to 1,200 c/s and uranium content is 0.54 to 36 ppm. Radioactive minerals found in granitic rocks consist of zircon, monazite, alanite, thorite, and branerite. The potential occurrence of radioactive mineral deposits on the island of Sulawesi are placer-type thorium deposits at the modern deltas and coasts.
KARAKTERISTIK STRUKTUR GEOLOGI DAN PERANANNYA TERHADAP SISTEM PANAS BUMI NAGE, KABUPATEN NGADA, PROVINSI NUSA TENGGARA TIMUR: STRUCTURAL GEOLOGY CHARACTERISTICS AND ITS ROLES TO THE NAGE GEOTHERMAL SYSTEM, NGADA DISTRICT, EAST NUSA TENGGARA PROVINCE Pradipta, Devito; Adhitya Permana, Lano; Muhammad Ramdhan, Divi
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.332

Abstract

Nage Region is part of Sunda-Banda Arc volcanism which formed an en-echelon array in Flores Island. The complex regional tectonics setting of the study area has created intensively found geological structures in the study area. The study was made through identification of structural geology by topographic lineament analysis, river lineament, circular features, and fault fracture density in DEMNAS image and followed by field observation to identify primary and secondary geological structures in 87 stations.The measurements of 441 geological structures positions in the study area found that secondary geological structures, mainly shear fractures, in order to identify the occurence of minor faults which are found in Quarternary rocks in the study area. Kinematic analysis of minor faults confirms the occurence of NW-SE and NE-SW oblique strike slip faults and also NE-SW directed strike slip fault. Normal faults in the study area are ffound as circular features which has been formed and associated with caldera collapse and crater forming processes. Dynamic analyses of faults are conducted to determine the principle compressive stress orientation which formed the faults has concluded that the compressional regime of the study area occured in the NNE-SSW direction with maximum stress (σ1) direction is 16°, N 203°E and minimum stress (σ3) direction is 17,5°, N 297,1°E. Faults are interpreted to have roles as fluid pathway in the developing geothermal system based on the occurence of hotspring manifestation and hydrothermal alteration. Based on the configuration of faults, geothermal manifestation, and hydrothermal alteration, it can be concluded that there are at least three fluid flow in the study area which are correlated with hydrothermal fluid ascent through fault F1 and bounded by fault F3, hydrothermal fluid ascent through fault F2, and hydrothermal fluid ascent from boiling through fault F10
PENENTUAN DAERAH PROSPEK MINERALISASI MENGGUNAKAN METODE GEOKIMIA TANAH, DAERAH NANGA BANGIK, KECAMATAN BOYAN TANJUNG, KABUPATEN KAPUAS HULU, PROVINSI KALIMANTAN BARAT: DETERMINATION OF MINERALIZATION PROSPECTS BY SOIL GEOCHEMISTRY METHOD IN NANGA BANGIK AREA, BOYAN TANJUNG DISTRICT, KAPUAS HULU REGENCY, WEST KALIMANTAN PROVINCE Sulaeman; Ernowo; Widhiyatna, Denni
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.334

Abstract

The tropical climate of Indonesia causes rock weathering. Soil from weathered rocks can be analyzed to determine the anomalies element to define the mineralization prospect areas using the geochemical methods. This study was carried out in the Nanga Bangik area with geological conditions favorable for mineralization. A total of 135 soil samples were collected from horizon B along ridge and spurs with sample intervals 75 - 100 meters. All samples were analyzed at the laboratory of the Center for Mineral Coal and Geothermal Resources in Bandung. Geochemical analysis was conducted using the Atomic Absorption Spectroscopy method, for the elements of Cu, Pb, Zn, Fe, Mn, Ag, and Au. Statistical distribution analysis, threshold calculation using mean+2SDEV and Median+2MAD and correlation between Factor Analysis were combined to determine the anomalies areas. Based on the calculation of the threshold using two different statistical methods, several anomalous values and groups of three factors were obtained: Factor 1: Pb-Fe-Zn-Ag Factor 2: Mn-Cu and Factor 3 in the form of element Au which was interpreted by the presence of metal mineralization. Three mineralization prospect areas were found in Bukit Empajak, Bukit Pirang and Bukit Limau.
KARAKTERISTIK ALTERASI DAN MINERALISASI CEBAKAN TEMBAGA DI DAERAH SETELUK DAN SEKITARNYA, KABUPATEN SUMBAWA BARAT, PROVINSI NUSA TENGGARA BARAT: THE CHARACTERISTIC OF ALTERATION AND MINERALIZATION OF COPPER DEPOSITS IN SETELUK AREA AND ITS SURROUNDING, WEST SUMBAWA DISTRICT, WEST NUSA TENGGARA PROVINCE Widi, Bambang Nugroho; Edya Putra
Buletin Sumber Daya Geologi Vol. 16 No. 3 (2021): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v16i3.336

Abstract

The research was conducted by the background of gold mining community around the research area. The purpose of the study was to know the continuity and type of mineralization that had been previously found outside the study area. The methods used include geological mapping and geochemical sampling of river sediments, rocks and pan concentrates. Laboratory analysis carried out at PSDMBP includes chemical analysis of the AAS method, petrographic examination, mineragraphy, grain mineralogy and Spec-Terra. Mineralization in the Seteluk area and its surroundings is one of the most interesting forms of mineralization occurring in intrusive granodiorite, volcanic and sedimentary rocks. There are three forms of indication of mineralization, namely; Firstly is low sulfidation epithermal mineralization, characterized by the presence of quartz veins breaking through the argillic zone (illite, montmorillonite, and kaolinite) in the sandstone with mineral associations of chalcopyrite, sphalerite, galena and pyrite. Both high sulfidation epithermal mineralizations are characterized by the presence of massive silica in which there is a localized vuggy silica structure of sulfur with alteration minerals of pyrophyllite, jarosite, and pyrite sulfide. The three porphyry indications are thought to occur in granodiorite with the main characteristics of epidote alteration, chlorite with veinlets and magnetite spots. The identified metallic minerals have associations of magnetite, ilmenite, chalcopyrite, galena, sphalerite, covelite and iron oxide. The results of rock chemistry analysis showed the highest Au content was 98 ppb; Cu 774 ppm, Pb 7993 ppm and Zn 23007 ppm. Indications of Au and Cu mineralization are also known from panning results in the form of gold and chalcopyrite grains with the percentage of chalcopyrite grains reaching 53%. The alteration and mineralization pattern shows the appearance of magnetite with ilmenite, chalcopyrite and pyrite in the granodiorite intrusion which is estimated to be a potassic zone (?) then towards the outside of the silica zone, advanced argillic, argillic zone and the outermost propylite zone. This area is thought to be a porphyry (?) type mineralization system in the interior, followed by high sulfidation and then low sulfidation epithermal mineralization with mineralization centers estimated to be below the surface.
Bahasa Inggris KORELASI ANTARA PEMODELAN INVERSI 3-D MAGNETOTELLURIK DENGAN DATA SUMUR DI LAPANGAN PANAS BUMI PATUHA: CORRELATION BETWEEN 3-D MAGNETOTELLURIC INVERSION MODEL WITH DRILLING DATA IN PATUHA GEOTHERMAL FIELD Chevy Iskandar; Yunus Daud
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.328

Abstract

The Patuha geothermal field is located in West Java Province, Indonesia and developed by state owned company PT Geo Dipa Energi (Persero). The Commercial Operation Date (COD) for Patuha was in September 2014 with plant capacity of 1x60 MW. Until now, Patuha Unit I geothermal field has been running for almost 7 years. The current production wells have experienced a natural decline, which is showed by a reduction in production capacity to the initial production. This causes the steam supply to the Power Plant Unit I to be not optimal, so a make-up well program is needed. Furthermore, to support the addition of electricity production capacity from geothermal energy in Indonesia, the development of the Patuha Geothermal Field is planned to be carried out for the next Power Plant Unit’s expansion (Unit 2 and Unit 3). Nevertheless, determining the location for both make-up and development drilling might still pose high risks. This is especially because the development area (where production and injection wells are located) is only concentrated in the eastern area of the contract area. Geophysical data especially Magnetotelluric (MT) has an indispensable role considering the limited data and the limited number of existing wells that cover the entire Patuha prospect area. To understanding the subsurface feature and see the correlation between MT model with well results in Patuha Geothermal Field, MT and TDEM survey were conducted in the eastern and western parts of Patuha area with total 100 stations. Considering the complexity of the subsurface condition in volcanic area, 3-D inversion of the MT data will be the most representative approach to investigate geothermal system in Patuha Geothermal Field. An obvious subsurface resistivity distribution revealed by the 3-D inversion showed a good agreement with well results especially in mapping the temperature distribution both vertically and horizontally. Generally, the resistivity distribution consists of a conductive zone (1–10 ohm-m) at the shallow part overlying a reservoir zone with a rather higher resistivity range (20–60 ohm-m). The conductive zone (<10 ohm-m) is correlated with Base of Conductor (BOC) of the wells that indicated by the presence of the argillic mineral. Meanwhile, the resistivity value around 15-20 ohm-m is correlated with Top of Reservoir of the production or injection well which is characterized by the presence of a convective temperature. In addition, from the results of resistivity mapping there is a very good correlation also in determining of reservoir boundary which is characterized by the presence of reverse temperature from the well. These results can be used as a guidance for better development strategy and drilling prognosis for the next drilling campaign especially in the area which limited number of wells.
PEMBENTUKAN BAUKSIT DAN FERIT PADA PROFIL PELAPUKAN DI KABUPATEN LINGGA: FORMATION OF BAUXITE AND FERRITE IN WEATHERED PROFILES ON LINGGA REGENCY Ronaldo Irzon
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.335

Abstract

Weathering could stimulate the formation of several economic deposits such as bauxite, ferrite, nickel, manganese, and ion-adsorption type REE. Lingga Regency is situated near the equator with a tropical climate that is vulnerable to weathering. The area is constituted of several Paleozoic rock units and is located near the Bentong-Raub Suture that sustains intensive weathering for a long time. This study aims to describe the geochemical characteristics of weathered rocks and the formation of weathering-related mineral deposits in the Lingga Regency. All samples are weathered based on LOI, CIA, and IOL parameters. The SiO2-Fe2O3T-Al2O3 triangular diagram shows that ferrite and bauxite are formed in totally four locations. The highest Al2O3 concentration of bauxite reaches 60%, while the highest Fe2O3T of ferrite is 69%. La/Y ratio defines that weathering happened in a basic environment, while Al/Ti ratio concludes that the studied samples are originated from felsic rock. REE in weathering profiles are more extractable than those in igneous rocks, but the composition in this study is not attractive for further exploitation as they are range in low to medium concentrations. Further research is required to quantify bauxite and ferrite resources and reserves in Lingga Regency.
KARAKTERISTIK LITOTIPE DAN HUBUNGANNYA TERHADAP CLEAT BATUBARA DI DAERAH KUALA KUAYAN, KOTAWARINGIN TIMUR, KALIMANTAN TENGAH: LITHOTYPE CHARACTERISTICS AND THEIR RELATION TO COAL CLEATS IN KUALA KUAYAN AREA, EAST KOTAWARINGIN, CENTRAL KALIMANTAN Muhammad Abdurachman Ibrahim; Sigit Arso Wibisono
Buletin Sumber Daya Geologi Vol. 17 No. 1 (2022): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v17i1.343

Abstract

The characteristics of coal can be seen from the lithotype and cleats. This research studied about low rank coal from Dahor Formation to characterize lithotype, cleats, and luster of the coal. Coal lithotypes are associated with maceral in the form of thin bands. Cleats are fractures in coal. Luster is the bright appearance in coal. The coal samples for this research are obtained from Kuala Kuayan area, Kotawaringin Timur, Central Kalimantan. Coal samples were obtained from three exploration wells in this area. Analysis was carried out by looking at the luster and cleats megascopically to the coal seam and to the depth of the coal. The lithotype characteristics indicates that the deeper the depth of the coal seam, the better the bright luster of the coal. The lithotype characteristics are classified as banded coal/clarain. Cleat characteristics from this research are more cleat ferquency and more bright luster. Litotype is quite influential on the frequency of cleats.

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