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INDONESIA
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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PEMODELAN DAN ESTIMASI POTENSI BATUBARA DI DAERAH JANGGA, KABUPATEN BATANG HARI, PROVINSI JAMBI: MODELING AND COAL POTENTIAL ESTIMATION IN JANGGA AREA, BATANG HARI REGENCY, JAMBI PROVINCE Rizki Satria Rachman; Rino Destama Sugandhi; Rezky Aditiyo; Sigit Arso Wibisono
Buletin Sumber Daya Geologi Vol. 17 No. 3 (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.v17i3.365

Abstract

Coal is one of the largest commodities used to produce electrical energy in Indonesia. As considered that coal is non-renewable energy, it is important to find new potential sources of coal. Exploration was carried out in the Jangga area, Batang Hari Regency, Jambi Province. It was an early stage exploration activity carried out by Center for Mineral, Coal dan Geothermal Resources, which consists of two activities, namely surface geological mapping and core drilling. After that, data processing was carried out to determine the 3D coal seam model and estimate the potential of coal. Two main rock units can be observed from geological mapping, namely sandstone and claystone units. Three coal outcrops were also found. Drilling activities were carried out at four locations, namely MK-01, MK-02, MK-03, and MK-04. Coal seam modeling and potential estimation were carried out using MineScape 5.7 software. From the results of the drilling data, there are 8 coal seams that can be modeled with supporting data in the form of coal outcrop data. The estimation of coal potential in this study refers to the exploration target group and the coal inventory group. From the estimation results, it is known that the minimum total exploration target is 1,158,822.74 tons and the maximum is 4,208,379.08 tons. Meanwhile, the total estimated coal potential in the inferred inventory group is 12,916,775.7 tons and the indicated inventory is 9,296,304.45 tons.
PERKIRAAN ULANG CADANGAN MUNGKIN PANAS BUMI TEMPERATUR MENENGAH DI INDONESIA: MEDIUM TEMPERATURE GEOTHERMAL POSSIBLE RESERVE REASSESSMENT IN INDONESIA Husin Nugraha; Rina Wahyuningsih; Tony Rahadinata
Buletin Sumber Daya Geologi Vol. 17 No. 3 (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.v17i3.366

Abstract

Accurate information about the value and characteristics of geothermal energy resources and reserves is needed in planning appropriate energy policies to optimize the utilization of geothermal resources in Indonesia. In addition, differences in the results of calculating geothermal energy resources and/or reserves by developers and the government cause the economic calculations of geothermal development projects in particular prospect area to also be different. This study performs a recalculation of geothermal medium temperature resources category by replacing the assumptions of several parameters with the assumptions of best practice parameters used in several literatures. The five parameters are thermal calculations contained in the fluid, final reservoir temperature, water saturation, electricity conversion factor and generating capacity factor. The results of this recalculation resulted in a geothermal resource value that was different from the results of the Geological Agency's calculations. The percentage difference between the calculations of the Geological Agency and this study indicates a strong correlation with reservoir temperature as shown by the R2 value of 85%. This strong correlation indicates that there is a systematic difference, which is suspected because in the Geology Agency's calculations it is assumed that there is a change in the water phase from the liquid phase to the vapor phase. The results of recalculation using the correlation equation with the reservoir temperature as an input resulted in the value of geothermal resources reduction by 27% or 940 MWe from the results of the Geological Agency's calculations. The recalculation result of medium temperature geothermal resources which previously reached 3,482 MWe reduced to a total of 2,541 MWe.
DELINEASI POTENSI BENTONIT MENGGUNAKAN METODA GEOLISTRIK DI DESA SEKARWANGI, KECAMATAN CURUGBITUNG, KABUPATEN LEBAK, PROVINSI BANTEN: DELINEATION OF BENTONITE POTENTIAL USING GEOELECTRIC METHOD IN SEKARWANGI VILLAGE, CURUGBITUNG DISTRICT, LEBAK REGENCY, BANTEN Ade Ihsanudin; Mega Fatimah Rosana; Johanes Hutabarat
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): 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.v18i1.378

Abstract

Bentonite is an abundant mineral resource in Indonesia, based on data from the Center for Coal and Geothermal Mineral Resources (PSDMBP) in 2021 the measured resource of bentonite is 3,299,072,992.75 tons and has not been utilized optimally. Sekarwangi Village has bentonite resources, based on that the purpose of this research was conducted to find out the potential and types of bentonite found in the Sekarwangi area so that it can be put to good use. Sekarwangi Village is located in Curugbitung District, Lebak Regency, Banten Province, Indonesia. This research is divided into two stages, namely field activities and laboratory activities. Field activities include geological observations and geoelectric measurements. Laboratory activities are testing the geochemical content of rocks in the form of XRF (X-ray Fluorescence) and XRD (X-Ray Diffraction)analysis. The result shows that the rocks are composed of volcanic deposits, one of which is tuff. Based on the results of chemical analysis, bentonite in the study area is classified in the Ca-Bentonite category. Potential bentonite layer can be found at the depth of 1.27 - 40.24m. Bentonite has thickness ranging from 9.6m to 34.61m. The resistivity value ranges from 0.09 - 9.69 ohm/m.
THE CHARACTERISTICS OF BASE OF CONDUCTOR IN X GEOTHERMAL FIELD BASED ON THE MAGNETOTELLURIC AND WELL DATA: KARAKTERISTIK BASE OF CONDUCTOR DI LAPANGAN PANAS BUMI X PULAU FLORES BERDASARKAN DATA MAGNETOTELLURIK DAN SUMUR EKSPLORASI Dizanissa Purnama Sari; Yunus Daud; Haris Siagian
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): 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.v18i1.362

Abstract

The X Geothermal Field in Flores, East Nusa Tenggara, has surface thermal manifestations such as hot springs, fumaroles, and alteration rocks, which indicate potential geothermal resources. This research aims to model and characterize the base of the conductor in X geothermal field as a supporting data for geothermal exploration studies. The modeling was performed using 3D magnetotelluric inversion analysis that was correlated with well data, i.e, drill cuttings, methylene blue, and Pressure and Temperature Test. According to the results, the subsurface condition of the study area consists of an argillic zone around 400-300 masl, a transition zone around 300 and 0 masl, and a propylitic zone below 0 masl. At an elevation of 400-300 masl, the base of conductor marks the boundary between the reservoir and the clay cap. The BOC distribution map reveals that the average BOC elevation is between 300 and 550 meters above sea level. The exploration potential is in the northern part with a prospect area of 3,4 km2 in research.
KARAKTERISTIK ANOMALI GAYA BERAT DAN NILAI TAHANAN JENIS AUDIO MAGNETOTELURIK (AMT) DI DAERAH PANAS BUMI GIMPU,KABUPATEN SIGI, SULAWESI TENGAH: CHARACTERISTICS OF GRAVITY ANOMALIES AND RESISTIVITY VALUE OF AUDIO MAGNETOTELLURIC (AMT) IN GIMPU GEOTHERMAL AREA, SIGI REGENCY, CENTRAL SULAWESI Asep Sugianto; Mochamad Nur Hadi
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): 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.v18i1.369

Abstract

The Gimpu geothermal area is one of the geothermal areas in Central Sulawesi. Surface geothermal manifestations are characterized by the emergence of hot springs with a temperature of 53–67 oC.Geophysics research in this area was conducted to determine the subsurface structure that describes the geothermal system in the Gimpu area. This paper discusses the characteristics of gravity anomalies and resistivity values in magnetotelluric audio (AMT) data. The results show that the distribution pattern of gravity anomalies forms a nearly north-south and northwest-southeast trending lineament. This alignment can also be seen from the results of the First Horizontal Derivative (FHD) analysis. This alignment is thought to be related to the fault structure, which controls the appearance of hot springs on the surface. The results of the 3D gravity modeling show that there is a high-density body around the Langkapa hot springs, presumably as a response from igneous rocks indicating a heat source beneath the surface. The results of 2D AMT modeling show the distribution of low resistivity values of 40 Ohm.m around the Langkapa and Karani hot springs. The distribution pattern of low resistivity values in this area is not like that in volcanic environments in general but is more like the distribution pattern of resistivity in non-volcanic geothermal areas. Therefore, the area that is estimated to be associated with the cap rock in the Gimpu geothermal system has a resistivity value of 40 Ohm.m. The low resistivity zone is located around the Langkapa and Karani hot springs, with an area of about 3 km2.
ANALISIS ANOMALI LAND SURFACE TEMPERATURE MENGGUNAKAN CITRA SATELIT LANDSAT 8 UNTUK IDENTIFIKASI PROSPEK PANAS BUMI GUNUNG SIRUNG DI KABUPATEN ALOR, PROVINSI NUSA TENGGARA TIMUR: ANALYSIS OF ANOMALY LAND SURFACE TEMPERATURE USING LANDSAT 8 SATELLITE IMAGERY TO IDENTIFY GEOTHERMAL PROSPECT OF MOUNT SIRUNG IN ALOR REGENCY, EAST NUSA TENGGARA PROVINCE Annisha Bunga Fathya; Husin Nugraha; Alvira Gusti Ranti; Rina Wahyuningsih
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): 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.v18i1.367

Abstract

High anomaly analysis of Land Surface Temperature (LST) on Landsat 8 imagery is a remote sensing method to detect the presence of geothermal prospects. This analysis is carried out through the presence of ground surface temperature anomalies. This study aims to identify the indication of Mount Sirung geothermal prospect in Alor Regency, East Nusa Tenggara Province through high LST anomaly analysis which is useful for determining more specific areas for field survey locations. The research method used is LST with a single-channel algorithm using Landsat 8 imagery and determination of high temperature indications based on LST anomalies with natural breaks classification, percentiles, and classical statistics. The Thermal Infrared Sensor (TIRS) band of Landsat 8 imagery could be a cheap and fast alternative for estimating land surface temperature analysis using the LST anomaly determination method which is useful for determining the boundaries of geothermal prospect indication areas prior to field surveys. This is evidenced by the suitability between the LST high anomaly area and the geothermal prospect area resulting from a field survey. The classification method for determining anomaly values ​​using the natural break and percentile approaches is better than the Classic Statistics approach (mean + 2 Standard Deviation) because the natural breaks and percentile approaches are more robust to the shape of the data distribution, therefore the resulting high anomaly areas becomes detailed and specific.
PENGUKURAN RADIOAKTIVITAS DAN ESTIMASI SUMBER DAYA TORIUM DI DAERAH BATUBESI, BELITUNG TIMUR: RADIOACTIVITY MEASUREMENT AND RESOURCE ESTIMATION OF THORIUM IN BATUBESI AREA, EAST BELITUNG Rachman Fauzi; Adhika Junara Karunianto; Ersina Rakhma; Ngadenin Ngadenin; Frederikus Dian Indrastomo; Tukijo Tukijo
Buletin Sumber Daya Geologi Vol. 18 No. 2 (2023): 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.v18i2.380

Abstract

Thorium is radioactive element which can be used as the main element of nuclear fuel beside of uranium. Belitung island is located at The Southeast Asian Tin Belt where it has much radioactive mineral potential. The purpose of this study is to conduct radioactivity measurement and inferred resource estimation of thorium (Th) in study area. The lithology of study area consists of meta-sandstone unit, biotite-granite unit, and hornblenda-granite unit. Contact zones between these lithological units have become radioactive anomaly area which have dose rate of 300-360 nSv/hour, eU grade of 12-18 ppm, eTh grade of 48-96 ppm, and eK grade of 1.5-1.8%. XRF analyses show that grades of U and Th are 0.7-51.8 ppm and 0.8-344.8 ppm, respectively. Based on estimation result it is shown that the value of inferred resource of thorium at Block I-V in study area is 197.448 tonnes. In order to enhance geological assurance of the category of those resources, it is necessary to implement more detail and systematic exploration methods.
KARAKTERISTIK MINERALISASI CEBAKAN AU±LOGAM DASAR DI TAMILOUW – HAYA, PULAU SERAM, MALUKU: MINERALIZATION CHARACTERISTIC OF AU±BASE METAL DEPOSIT AT TAMILOUW - HAYA, SERAM ISLAND, MALUKU Herfien Samalehu; Arifudin Idrus; Nugroho Imam Setiawan
Buletin Sumber Daya Geologi Vol. 18 No. 1 (2023): 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.v18i1.400

Abstract

The research area is located in the southern part of Seram Island, Maluku, which is at an elevation of 3 to 675 meters above sea level; is composed of metapelites to low-grade metamorphic rocks, coralline limestone and alluvial deposits. The purpose of this investigation is to study geological control, mineralization characteristics and ore geochemistry of Au±basemetal deposit in Tamilouw – Haya. Investigation activities began with literature review, field investigations for sampling, geological mapping, alteration & mineralization and laboratory analysis which including polish sections and ore geochemistry (FA/AAS). Based on the results of investigation, it shows that mineralization in Tamilouw - Haya is associated with 3 type of veins, namely quartz veins (V1) that parallel to the foliation plane (concordant), quartz veins that cutting through foliation plane (V2) and third generation veins (V3) are quartz ±carbonate veins associated with breccia - stockwork and formed at the end of veins formation. Massive texture is found in most of the veins, especially those with relatively large dimensions. Vein filling minerals are dominated by quartz, sulfide minerals and precious metals while dominant sulfide veins consist of pyrite and arsenopyrite. Metal sulfide mineralizations at Tamilouw – Haya are pyrite, gold, chalcopyrite, sphalerite, galena, pyrhotite, tetrahydrite, tenantite, marcasite, arsenopyrite, sinabar, kalininite and realgar. Gold grades reaching 0.006 to 7.45 ppm.
PEMBUATAN BAHAN ACUAN BAKU UNTUK ANALISIS SAMPEL BATUBARA: PRODUCTION OF STANDARD REFERENCE MATERIALS FOR COAL SAMPLE ANALYSIS Firdaus Djabar; Fitro Zamani; Herry Rodiana Eddy
Buletin Sumber Daya Geologi Vol. 18 No. 2 (2023): 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.v18i2.419

Abstract

A requirement in the ISO 17025-2017 quality control systems is the adaptation of standard reference materials to ensure measurement accuracy and validation. However, standard reference material is expensive with difficult procurement procedures and limited matrices. Therefore, it is necessary for laboratories to produce their own standard reference materials. This study aims to explain the production of internal standard materials of coal from PT Berau Coal concession area at Sambarata mining site, Tasuk Village, Gunung Tabur District, Berau Regency, East Kalimantan Province. The production stages of standard reference materials involve preparation, homogenization, parameter analysis, statistical tests, and sample packaging. The statistical calculations were performed using the F-test/ANOVA single factor/homogeneous sample, Dixon test and Z-Score. Coal samples were also analyzed at seven accredited coal laboratories in Indonesia. The chemical and physical analysis methods used American Standard Testing and Materials (ASTM) and BSI British Standards. The produced in-house standard reference material indicates ash content of 1.36 ± 0.23%, volatile matter of 45.03 ± 1.29%, total sulfur of 0.14 ± 0.07%, calorific value of 7,310 ± 67kal/gr, and specific gravity of 1.30 ± 0.06.
PENGARUH NILAI CADANGAN PANAS BUMI TERHADAP KELAYAKAN PROYEK PENGEBORAN SUMUR EKSPLORASI OLEH PEMERINTAH BERDASARKAN PERBANDINGAN BIAYA DAN PENDAPATAN NEGARA: STUDI KASUS PROYEK NAGE, KABUPATEN NGADA, PROVINSI NUSA TENGGARA TIMUR: GEOTHERMAL RESOURCES EFFECTS ON PROJECT FEASIBILITY OF EXPLORATION WELL DRILLING BY THE GOVERNMENT BASED ON STATE COST AND REVENUE COMPARISON: A STUDY CASE OF NAGE PROJECT, NGADA REGENCY, EAST NUSA TENGGARA PROVINCE Evi Octavia; Iman K Sinulingga; Fitri Purnamasari Liveta; Husin Setia Nugraha
Buletin Sumber Daya Geologi Vol. 18 No. 2 (2023): 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.v18i2.361

Abstract

The three main problems in Indonesia's geothermal development include selling price issues, working area tenders, and high upstream risks. These three will lead to one condition: geothermal projects cannot reach their economic level. The Government of Indonesia (GoI) has initiated the Government Drilling Program to reduce high upstream risks. In addition to the main objective of reducing geothermal upstream risk, this program can indirectly generate state revenue. It is necessary to evaluate the program not only from a technical perspective but also from a financial point of view. Stakeholders could consider the evaluation results when making decisions about the continuity of this program. This financial evaluation will assess whether the costs incurred as an investment generate the desired rate of return. In this case, it compares the costs incurred by the GoI from the state budget (APBN) and the revenues obtained by the GoI from tax and non-tax. The Indonesiaost ratio (BCR) value is a parameter indicator of its assessment. The study results show that the BCR value of the government's cash flow from the Nage Project is 2.1. This value indicates that every rupiah of costs incurred by the government in the project will generate more than twice as much state revenue. Using the rate of return parameter, namely the Internal rate of Return (IRR), this project produces a value almost double the rate of return determined if the project uses the state budget. In addition, the Nage Project's valuation based on the Net Present Value (NPV) shows a positive value (NPV> 0). Based on those three indicators, the Government Drilling Program, especially the Nage Project, is feasible to continue. However, when viewed from the developer's cash flow perspective, the Nage Project of 30 MWe is still not attractive to private developers in Indonesia because the value of the project feasibility indicator is negative or –the rate of return is still below the desired value (IRR < MARR - Minimum Attractive Rate of Return ). The project is still feasible to be continued by developers from state-owned enterprises (SOE), which usually have lower MARR values. In addition, SOE has privileges in loan and depreciation parameters compared to private developers.

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