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Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Published by Badan Riset dan Inovasi Nasional
ISSN : 08541418     EISSN : 2503426X     DOI : https://doi.org/10.55981/eksplorium
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology
EKSPLORIUM is published to deliver the results of studies, research and development in the field of nuclear geology. The manuscripts are the result of study, research and development of nuclear geology with scope: geology, exploration, mining, nuclear minerals processing, safety and environment, and development of nuclear technology for the welfare.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 6 Documents
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Search results for , issue "Vol. 33 No. 2 (2012): NOVEMBER 2012" : 6 Documents clear
Prospek Thorium pada Endapan Aluvial di Daerah Koba dan Sekitarnya Ngadenin, Ngadenin; Indrastomo, Frederikus Dian; Widodo, Widodo
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2658

Abstract

The objective of the present study of the thorium in placer of Koba, Central Bangka District, Bangka Belitung Province and its surrounding is to find out thorium prospect in alluvial deposits. The study method are geological and radiometrical mapping, grain counting and thorium grade analysis of pan concentrated. Result of the research reveals that lithology of the investigation area compose of metasandstone unit with radiometric value of 35 c/s - 200 c/s, granite intrusion with radiometric value of 140-550 c/s and alluvial with radiometric value of 40-300 c/s SPP2NF. Content of monazite in the pan concentrated is approximately 7.54 %, content of thorium in pan concentrated of 1410 ppm, covered alluvial deposits of about 400 kilometers square with average thickness 3.77 meters. According to the study thorium prospect in Koba area is feasible to be Based on the type of deposit (placer) which are relatively easy to be mined at low cost, high content of monazite and thorium so that the prospect thorium Koba feasible to develop.
Structural Characteristics of The Semanggol Formation Along The East-West Highway Route 67 Baling Area, Kedah, Malaysia Ulfa, Yuniarti; Hafizzy , Mohd Hafiz; Farhan, Muhammad
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2659

Abstract

The amounts of structural data available from the East-West Highway Route 67 of Baling Area have been used to unravel the structural characteristics of the Semanggol Formation, which comprises black mudstone, sandstone, tuffaceous sandstone, tuff, paraconglomerate, siliceous shale and chert. The area was cut by two sets of faults trending NW-SE and NE-SW. The main fault in this area is known as Bok Bak fault that is trending NW-SE and have moderately to steeply dips (40o-88o) as compared to the conjugate faults. Two sets of folds trending NE-SW and NW-SE were also identified in this area, where most of them are symmetrical fold with gentle to open fold varies from non-plunging to nearly moderately plunging folds. Most of the faults have parallel orientation to the fold axis, indicated this pattern probably originated at the same period of deformation due to warping and uplifting.
Kajian Awal Prospek Bahan Galian Monasit di Kendawangan Kalimantan Barat Subiantoro, Lilik; Soetopo, Bambang; Haryanto, Dwi
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2660

Abstract

Kendawangan areas is included in the regional geological coverage area of Ketapang that is identified have monazite deposits with radioactive minerals contain is uranium (U), thorium (Th) and rare earth element (REE). Results of grain counting analysis shows the content of the mineral monazite and zircon in heavy mineral grains reached 63% to 40% (of total grains), the analysis of rock samples contained grains of 0.11% monazite. The study was conducted on secondary data covering aspects of geology, source rock, traps and interpretation of heavy mineral distribution placer contain monazite and zircon. Objectives to be obtained is information about the character of the geology and distribution of monazite mineral resources with Thorium-contain and zircon. Source rock of monazite minerals is a granite 77-150 million age (Jurassic - Late Cretaceous), including the S type of the alkaline granites, formed in pegmatitic stage which advanced differentiated at a temperature 550-6000C. The anomalous radioactivity of Granite has a value of 400 c/s-9200 c/s with the characterized minerals are K-feldspar, quartz and plagioclase, minerals accompanying the form as thorite, monazite, zircon and alanite. Uranium range of the granitic rocks is 2.5 ppm - 64.8 ppm. The lateral distribution of alluvial deposits containing monazite placer occupy at flood plains valley between of hilly land area 225,040 Ha, obeying the distribution pattern of granitic rocks. Monazite propek area lies in the valley flood plain of the watershed at Sungai Kendawangan (107,800 Ha), Sungai Airtanah dingin (27,610 Ha), Sungai Tapah (42,010 Ha) dan Sungai Naning (45,010 Ha).The potential is area target to ore deposit prospection at the next stage field investigation.
Pendeteksian Keberadaan Struktur Sesar pada Batuan Vulkanik dengan Metode Magnetik Suntoko, Hadi; Nurdin, Muhammad; Susilo, Yarianto Sugeng Budi; Hamzah, Imam
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2661

Abstract

Banten NPP site is located in Kramatwatu-Bojonegara district, Serang, it has a surface fault indication in volcanic rock it known that to Northwest-Southeast trending. Indications of the satellite imagery analysis maps confirm the straightness (lineament) at Bojonegara-1 fault. A lineament as fault structures to be necessary to prove existence of magnetic method in order to determine the continuity of Bojonegara-1 fault in the subsurface. The purpose of the study is to know the Bojonegara fault in the subsurface. Through on interpretation and analysis of the earth's magnetic field on the scale of an object to be caused a variety of sources it can be detected by intensity magnetic as a total magnetic moment of unity volume to study the condition of the deformed rocks. The study used are G856-AX Proton Magnetometer precession magnetometer (PPM) over a stretch of 300 m and 10 m intervals for the fault lineament. The measurement system uses two sensors and observations, corrected magnetic field strength is ideal as a reference for the total magnetic field anomalies. Preliminary results show that the fault lineament is indicated at the observation point with a depth to unknown so that it still need more detailed. Magnetic method is very good for an early review of fault structures with fast and simple.
Pengendapan Unsur Tanah Jarang Hasil Digesti Monasit Bangka Menggunakan Asam Sulfat Anggraini, Mutia; Sumarni, Sumarni; Sumiarti, Sumiarti; Rusyidi, Rusyidi; Waluyo, Sugeng
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2662

Abstract

Rare earth elements are elements that widely used in many products. Rare earth elements nature are not found in a free state, but they are in the complex compounds, so that chemically processing is required to separate the Rare earth elements from their complex compounds. Monazite as by product of Bangka tin process contains several major elements, such as 0.298% uranium (U), 4.171% thorium (Th), 23.712% phosphat (P2O5) and 58.97% rare earth elements (REE) oxide. These elements can be individually separated through a process of precipitation stages. The separation process used in the study is the method of acid by using sulfat acid as reagen and filtrat digestion as feeds. The process of digestion dissolve the elements U, Th, RE and phosphate from the complex compound. Rare earth elements that are disolved can be separated from the complex compounds by using sulfat acid precipitation process. The objective of research is to set the optimal conditions for the Rare earth elements precipitation with sulfat acid. The result showed that the amount of sulphuric H2SO4 which added is 3.5 times volume of feed and precipitation time is 20 minutes, percentage of precipitation recovery is 61.21 % REE, 78.46 % U, and 93.56 % PO4.
Geologi dan Mineralisasi Uranium Sektor Nyaan Mahakam Hulu Kalimantan Timur Sukadana, I Gde
EKSPLORIUM Vol. 33 No. 2 (2012): NOVEMBER 2012
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2012.33.2.2663

Abstract

Nyaan Sector covered 0.5 km2 area. The aim of research is to understand the geological setting, mineralization and potency of uranium in Nyaan Sector. The research activities involved topography measurement, soil radioactivity measurement by grid of 20x20 m2, stratigraphic and detailed geological structure observation, the making of peels at any anomaly area and radioactivity anomaly area. There are 3 (three) significant radiometric anomaly locations at Nyaan Sector. They are anomaly Sungai Marta, Marta Hulu and Aloha with radiometric value ranges from 8000 c/s to > 15000 c/s with background value of 100 c/s. In these areas, the making of peels, trench and test pit were conducted by sampling mineralization using systematic channel sampling system by the sum of 15 channels sampling and 8 chieps sampling. The petrography and mineralogy analysis exhibited that mineralization of pitchblende, monazite, autunite were associated with bornite, chalcocite, chalcopyrite, lolingite, pyrite, sphalerite, ilmenite, limonite, magnetite, marchasite, rutile, malnicovite, hematite and iron oxide. Results of geochemical analysis for total uranium content in the rocks ranged between 345 to 11.425 ppm of uranium.

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