Fly ash and bottom ash (FABA) is defined as waste residu that is produced from coal combustion process in electric power plant. Its production will increase due to high demand of electric energy. It commonly consists of silica, alumina, ferric oxide, and others oxide. Coal ash is also an economically promising resource for extraction of several valuable elements, including Ge, Ga...
The weathering process occurs on the Earth's surface, especially in tropical climates, and causes the parent rock's mobilization of elements. Weathering is interesting because it is often associated with the enrichment of economic materials such as iron, alumina, and REEs. The weathering profile of Tertiary volcanic rocks is spread across tropical Sumatra. This study aims to...
Oil shales is defined as fine sedimentary rock that contains organic material and can produce oil when extracted. The Sinamar Formation in the study area is thought to be a carrier for oil shales. This formation is located in the western and southeastern parts of the study area and is thought to have age of Oligocene. Based on BRP-02 well data, lithology of the study area...
South Sumatra Basin is the second largest resource of coal basin in Indonesia. The abundance of coal in this basin has opened up opportunities to exploring coal bed methane. Gas content and permeability affect the potential of coal bed methane in an area. Coal permeability is highly controlled by the cleat system that develops in the coal seam. Studies on cleat characterization...
Magnetotelluric (MT) method can determine conductivity structure in geothermal area which could be interpretated as smectite clay (clay cap) is commonly used to help target geothermal wells and assess resource capacity. In order to process MT data, we can do 1-D, 2-D, and 3-D inversion modelling to produce a realistic MT model data. 1-D inversion is very easy to do, where this...
Graphite can be applied in various uses for example as a heat resistant materials, batteries, and electrodes. Graphite material can be obtained from synthetic graphite which produced from anthracite coal that is heated at 2000ºC or above. Naturally heat affected coal can be found in Tambang Air Laya (TAL), Tanjung Enim, South Sumatra where the coal is affected by the presence of...
Sorik Marapi geothermal area in Mandailing Natal Regency, North Sumatra Province has a high-temperature geothermal system that is interpreted from the chemical characteristics of hot springs. The presence of alteration minerals such as epidot in exploration well cutting samples strengthens the estimated reservoir temperature reaches 235⁰C. The presence of hot water are more...
Indonesia is a country that has a lot of coal deposits, and one of the largest deposits is in Sumatra Island. The Bukit Asam coal mine has had a long history beginning with the Dutch colonial period. Administratively, location of the studied area is located in the area of Bukit Asam coal mine, Tanjung Enim area, Muara Enim Regency, South Sumatra Province. This paper provides the...
Barani Pit is part of the PT Agincourt Resources Contract of Work, located in Aek Pining Village, Batangtoru District, South Tapanuli Regency, North Sumatra. The Barani Pit is an open pit mine, with epithermal deposit type in the form of veins which host for more concentration of metal elements. This study aims to find out the alteration characteristics and texture variations of...
The Ulusuliti and Tanjung Lima Kapas area, Koto Parik Gadang Diateh District, South Solok Regency, West Sumatra Province has a potential of iron ore form mineralization zone which is formed from the limestone formation intruded by granodiorite. Induced polarization method measurement was carried out in time domain using a dipole-dipole configuration with a space between the...
Sokoria Geothermal Field is located at Sokoria Village, Ende Regency, Nusa Tenggara Timur Province. Petrographic analysis and Methylene Blue test (MeB) were carried out to estimate the illite-smectite ratio and occurence of other alteration minerals as indicator for cap rock, transition and reservoir zones. Pressure and temperature test (P&T test) was also performed to determine...
High to low volatile bituminous coals of Tanjung Formation in Central Kalimantan Province is known to be potentially used as a metallurgical or coking coal. Coal maximum fluidity is one important parameter which is strongly connected to the quality of the coke produced. This study aims to determine the relationship between coal maximum fluidity and its volatile matter and ash...
Indonesia has the largest peat area in the tropical zone, which represents 70% of the peat area in Southeast Asia and 50% of the world's tropical peatlands. At present, the utilization of peat is still relatively low and its likelihood to cause major fires during dry season is still of great concern in Indonesia. On the other hand, peat has potential to be used as natural...
The Geothermal fluid has a very high content of dissolved elements. Geochemical methods are used to determine the potential indication of dissolved economic elements. Geothermal exploration has been carried out throughout Indonesia, mainly by the Geological Agency. The exploration result in the existence of hot spring data by analyzing SiO2, Al, Fe, Ca, Mg, Na, K, Li, As, NH4, B...
Cibaliung is located in the Honje Igneous Complex, which is a Miocene volcanic complex, having two economically mineable quartz veins, i.e. Cikoneng and Cibitung veins. These veins have been mined and produced by PT Cibaliung Sumber Daya - subsidiary of PT Aneka Tambang Tbk. In the production process, the veins have reached the maximum limit. Therefore, a new reserve must...
One of the physical properties of rocks that can be used to analyze a geothermal system is the resistivity of rock. Magnetotelluric method is one method that can be used to determine the resistivity of rock. MT measurements are carried out at 30 measuring points with north-south directed paths and the distance between measuring points is around 2000 meters. This research aims to...
Thermoluminescence (TL) has now been applied as a dating method for rock age. In geothermal exploration information about the age of rocks / volcanic material is very important to reconstruct the geological history related to thermal activity. Determination of the estimated age of rocks as a source of heat in the Lejja Geothermal prospect in Soppeng Regency, South Sulawesi...
The Natar geothermal field is located in Natar District, which is approximately 10 km north of Bandar Lampung, Lampung Province. This geothermal area is unique because the manifestation of hot springs that appear on the surface is in a relatively flat area. Geological observations on outcrops to determine the geological structure that control the hot springs are difficult to...
Geochemical research used the analysis method of -80 mesh of active stream sediment samples is one of the early phase exploration specially in finding out metallic mineral deposits. Easternpart of Halmahera with its complex geologic setting and a metallogenic region is being potential to form metallic deposits, which create some variation and interesting geochemical performances...
The LW-1 and LW-2 geothermal wells are located in the depression zone between Mount Lawu and Mount Jabolorangan contain rocks that are hydrothermally alterated as indicated by the presence of alteration minerals that are classified as argillic to advanced argillic alteration. To determine the character of the altered minerals that were formed, especially the presence of clay...
Pantar berada pada lingkungan vulkanik Kuarter yang memiliki potensi panas bumi yang diindikasikan dengan adanya manifestasi panas bumi berupa fumarola, solfatara, tanah panas dan air panas. Survei geofisika magnetotelurik (MT) dan gaya berat dilakukan untuk mengklarifikasi sistem panas bumi di daerah ini. Teknik pemodelan data MT menggunakan inversi 3 dimensi (3-D) dengan dan...
Mineralisasi di wilayah Erelembang, Tombolo Pao, Kabupaten Gowa, Sulawesi Selatan merupakan salah satu tipe mineralisasi yang cukup menarik di kawasan ini. Penciri utama proses mineralisasi adalah munculnya alterasi silisifikasi, argilik-argilik lanjut, dan propilitik yang membentuk suatu zona. Kehadiran mineral alterasi spesifik yang teridentifikasi meliputi alunite, halloysite...
Batubara telah menjadi salah satu sumber alternatif unsur-unsur tanah jarang (UTJ) seiring dengan meningkatnya permintaan terhadap kebutuhan unsur-unsur tersebut. Kondisi geologis spesifik menyebabkan pengayaan konsentrasi UTJ pada batubara. Keterdapatan lapisan tipis material vulkanik (tonstein) pada Lapangan Batubara Muara Tiga Besar Utara, Formasi Muara Enim, Cekungan Sumatera...
Daerah penelitian secara administratif terletak di Kabupaten Blitar, Provinsi Jawa Timur. Secara geografis, daerah penelitian terletak pada koordinat 112°05’09”- 112°15’45” Bujur Timur dan 8°11’53”- 8°18’47” Lintang Selatan atau 619625 – 639039 mT dan 9080860 – 9093645 mU zona 49S datum WGS1984 dengan luas 248,5 km2. Menurut pembagian zona fisiografi Jawa Timur, daerah penelitian...
Sumber daya gambut di Indonesia cukup berlimpah. Terlepas dari pertentangan dalam pemanfaatannya, gambut dapat digunakan sebagai alternatif bahan bakar Pembangkit Listrik Tenaga Uap (PLTU), karena memiliki syarat yang bisa terpenuhi dan mempunyai karakteristik yang identik dengan batubara kalori rendah. Tujuan penelitian ini adalah untuk mengetahui jumlah potensi sumber daya...