EKSPLORIUM最新文献

{"title":"Geostatistics Application On Uranium Resources Classification: Case Study of Rabau Hulu Sector, Kalan, West Kalimantan","authors":"H. Syaeful, Suharji Suharji","doi":"10.17146/eksplorium.2018.39.2.4960","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.2.4960","url":null,"abstract":"ABSTRACT In resources estimation, geostatistics methods have been widely used with the benefit of additional attribute tools to classify resources category. However, inverse distance weighting (IDW) is the only method used previously for estimating the uranium resources in Indonesia. The IDW method provides no additional attribute that could be used to classify the resources category. The objective of research is to find the best practice on geostatistics application in uranium resource estimation adjusted with geological information and determination of acceptable geostatistics estimation attribute for resources categorization. Geostatistics analysis in Rabau Hulu Sector was started with correlation of the orebody between boreholes. The orebodies in Rabau Hulu Sectors are separated individual domain which further considered has the hard domain. The orebody-15 was selected for further geostatistics analysis due to its wide distribution and penetrated most by borehole. Stages in geostatistics analysis cover downhole composites, basic statistics analysis, outliers determination, variogram analysis, and calculation on the anisotropy ellipsoid. Geostatistics analysis shows the availability of the application for two resources estimation attributes, which are kriging efficiency and kriging variance. Based on technical judgment of the orebody continuity versus the borehole intensity, the kriging efficiency is considered compatible with geological information and could be used as parameter for determination of the resources category. ABSTRAK Pada estimasi sumber daya, metode geostatistik telah banyak digunakan dengan kelebihan adanya alat atribut tambahan untuk mengklasifikasikan kategori sumber daya. Namun demikian, pembobotan inverse distance (IDW) adalah satu-satunya metode yang sebelumnya digunakan untuk mengestimasi sumber daya uranium di Indonesia. Metode IDW tidak memberikan tambahan atribut yang dapat digunakan dalam mengklasifikasikan kategori sumber daya. Tujuan dari penelitian adalah mendapatkan praktek terbaik untuk aplikasi geostatistik pada estimasi sumber daya disesuaikan dengan informasi geologi dan penentuan atribut geostatistik yang dapat digunakan untuk kategorisasi sumber daya. Analisis geostatistik di Sektor Rabau Hulu diawali dengan korelasi tubuh bijih antara lubang bor. Tubuh-tubuh bijih di Sektor Rabau Hulu merupakan domain individual yang selanjutnya dipertimbangkan memiliki domain tegas. Tubuh bijih-15 dipilih untuk digunakan pada analisis geostatistik selanjutnya karena distribusinya yang luas dan paling banyak dipenetrasi bor. Tahapan dalam analisis geostatistik mencakup komposit downhole, analisis statistik dasar, determinasi outliers, analisis variogram, dan perhitungan ellipsoid anisotropi. Analisis geostatistik menghasilkan kemungkinan aplikasi dua atribut estimasi sumber daya, yaitu kriging efisiensi dan kriging varians. Berdasarkan penilaian teknis kemenerusan tubuh bijih terhadap intensitas lubang bor, kriging efisien","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"569 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77616022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Subsurface S-type Granitoid Identification Based on Gravity and Seismic Tomography Models in Pacitan, East Java","authors":"J. Soesilo, I. R. Palupi, W. Raharjo, S. Sutanto, Faris Ahad Sulistyohariyanto, K. G. B. Ekaristi, Fandi Budi Stiawan","doi":"10.17146/eksplorium.2018.39.2.4954","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.2.4954","url":null,"abstract":"ABSTRACT Granitoid outcrop has been observed in Montongan, Tulakan Subdistrict, Pacitan District, East Java. Geochemically, granitoid shows peralluminous S-type granitoid which consists of comparable plagioclase and potassium feldspar leading to adamelite and granodiorite variety with andalusite, fine size corundum and cordierite inside. These modal minerals are consistent with its bulk chemical analysis result that shows alumina rich rock. Highly weathered spotted pinkish soil with remaining quartz gravels characterizes its surface. Lateritic pink soil up to more than 25 meters thick covers the granitoid body and this feature is indicative to locate its surface distribution, while its subsurface distribution is remain uncertain. The research aimed to identify granitoid subsurface distribution. To identify the subsurface body, gravity and seismic tomography models were used. According gravity model, the pluton body is 5 km wide which is rootless downward and seems extends eastward. Meanwhile, the north-south seismic tomographic model across Pacitan Region indicates dense solid body override the recent Java subduction zone. The body is assumed to have correlation with surface granitic rock. It supports an idea that there is a micro continent trapped beneath Southern Mountain of East Java. ABSTRAK Singkapan granitoid telah teramati di daerah Montongan, Kecamatan Tulakan, Kabupaten Pacitan, Jawa Timur. Secara geokimia, granitoid Pacitan memperlihatkan granitoid peralumina tipe-S yang tersusun berdasarkan perbandingan plagioklas dan kalium felspar menunjuk pada varian adamelit dan granodiorit dengan andalusit, korundum halus dan kordierit di dalamnya. Mineral modal tersebut konsisten dengan hasil analisis kimia total yang menunjukkan batuan kaya alumina. Tanah berwarna merah muda yang sangat lapuk dengan kerikil sisa kuarsa menjadi ciri khas di permukaannya. Tanah laterit merah muda yang tebalnya lebih dari 25 meter menutupi tubuh granitoid tersebut dan menjadi petunjuk penyebaranya di permukaan, namun penyebaran di bawah permukaannya masih belum pasti. Penelitian ini bertujuan untuk mengetahui penyebaran granitoid di bawah permukaan. Untuk mengidentifikasi tubuh bawah permukaannya, digunakan pemodelan gravitasi dan tomografi seismik. Menurut model gravitasi tubuh pluton mempunyai lebar 5 km dan tampak memanjang ke arah timur yang tidak menentu ke bawahnya. Sementara itu, model tomografi seismik utara-selatan yang memotong wilayah Pacitan, menunjukkan suatu tubuh padat keras berada di atas zona subduksi Jawa saat ini. Tubuh tersebut diasumsikan memiliki hubungan dengan batuan granitik di permukaan. Hal tersebut mendukung ide bahwa terdapat mikro-kontinen terperangkap di bawah Pegunungan Selatan Jawa Timur.","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78312486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pelindian Natrium Zirkonat Menggunakan Asam Klorida Secara Catu","authors":"Sajima Sajima","doi":"10.17146/EKSPLORIUM.2018.39.1.4369","DOIUrl":"https://doi.org/10.17146/EKSPLORIUM.2018.39.1.4369","url":null,"abstract":"Penelitian tentang teknologi pengolahan zircon terus dilakukan untuk mengikuti kebutuhan industri pasar. Pengolahan natrium zirkonat dengan pelindian menggunakan asam klorida sebagai pelarut telah dilkukan. Penelitian ini bertujuan mempelajari pengaruh ukuran butir, temperatur, dan kecepatan pengadukan terhadap zirkon terambil. Penelitian dilakukan dengan memasukkan pelarut (asam klorida 4 N) ke dalam reaktor, kemudian pelarut tersebut dipanaskan sambil diaduk. Umpan dengan ukuran butir tertentu dimasukkan ke dalam reaktor. Kondisi temperatur dan kecepatan pengadukan dijaga tetap. Setelah kondisi operasi tercapai, proses dihentikan kemudian disaring. Hasil penelitian dengan analisis XRF menunjukkan bahwa kondisi proses optimum dicapai pada ukuran butir 90 µm, temperatur 80 oC dan kecepatan pengadukan 200 rpm. Pada kondisi tersebut zirkon terambil sebesar 84.50 %.  Research on zircone processing technology has been continued to follow industrial market needed. Treatment of sodium zirconate with leaching process using hydrochloric acid as solvent has been conducted. The aim of the study is to evaluate the effect of grain size, temperature, and speed of stirring on the extracted zircon. The research starting with introduced the solvent (chloride acid 4 N) into the reactor, then heated while stirring. The feed with a certain grain size was introduced into the reactor. The temperature and stirring conditions were kept steady. Once the operating conditions are reached, the process is stopped and then filtered. The results with XRF analysis showed that the optimum process conditions were achieved on 90 μm grain size, the temperature of 80oC, and stirring speed of 200 rpm. The amount of zircon that taken out were 84.50% on this conditions.","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76025375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studi Keterdapatan Torium Pada Endapan Laterit Bauksit di Pulau Singkep Dalam Rangka Pengembangan Eksplorasi Torium di Wilayah Granit Jalur Timah","authors":"Ngadenin Ngadenin, K. Widana, Adhika Junara Karunianto","doi":"10.17146/eksplorium.2018.39.1.4258","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.1.4258","url":null,"abstract":"Eksplorasi torium di wilayah granit jalur timah pada lima tahun terakhir ditargetkan pada keterdapatan torium di cebakan timah primer maupun sekunder. Pulau Singkep adalah bagian dari Granit Jalur Timah, yang potensial terhadap keberadaan torium, sebagai cebakan primer maupun sekunder. Penelitian ini bertujuan untuk mengetahui karakteristik keterdapatan torium pada laterit bauksit menyangkut kadar torium dan kaitannya dengan keterdapatan mineral radioaktif dan kandungan cerium (Ce), lantanum (La), itrium (Y), dan zirkon (Zr) pada laterit bauksit. Data yang diperoleh dari penelitian ini akan digunakan sebagai bahan evaluasi untuk pengembangan eksplorasi torium pada cebakan laterit bauksit di Indonesia. Metode yang digunakan adalah pemetaan geologi, pengukuran kadar torium, dan pengambilan sampel konsentrat dulang untuk analisis mineral butir dan analisis kadar Ce, La, Y, dan Zr. Litologi yang menyusun daerah penelitian terdiri atas granit lapuk yang telah terubah menjadi laterit bauksit dengan kadar torium berkisar antara 25,9 hingga 177,8 ppm eTh. Konsentrat hasil pendulangan adalah konsentrat zirkon-ilmenit dengan kandungan mineral radioaktif terdiri dari zirkon, monasit, dan anatas. Kadar lantanum pada konsentrat zirkon-ilmenit adalah 0–412 ppm, cerium 0–80 ppm, itrium 27–82 ppm, dan zirkon 9.420–100.000 ppm. Keterdapatan torium pada endapan laterit bauksit di Pulau Singkep berhubungan erat dengan keterdapatan mineral zirkon, monasit, dan anatas. Karakterisrik keterdapatan torium pada endapan laterit bauksit mempunyai kemiripan dengan karakteristik keterdapatan torium pada cebakan timah primer dan sekunder. The thorium exploration in the last five years in the granite tin belt region is targeted at thorium availability in primary and secondary tin deposits. Singkep island is the part of granite tin belt which potential for thorium occurences either primer or secondary deposits. The purpose of this study was to determine the characteristics of thorium availability in bauxite laterite deposits concerning thorium content and its relation to the availability of radioactive minerals and cerium (Ce), lanthanum (La), Yttrium (Y), and zircon (Zr) contents on the bauxite laterite deposit. The data obtained from this study will be used as an evaluation material for the development of thorium exploration in bauxite laterite deposits in Indonesia. The methods used are geological mapping, thorium concentration measurements, and sampling of pan concentrate for mineral grain analysis and analysis of Ce, La, Y, and Zr contens. The lithology of the study area was granite that had weathered and turned into bauxite laterite deposit with thorium content ranging from 25.9 to 177.8 ppm eTh. The concentrate of the repeating result is zircon-ilmenite concentrate with radioactive mineral content composed of zircon, monazite, and anatase. La concentration on zircon-ilmenite concentrate is 0–412 ppm, Ce is 0–80 ppm, Y is 27–82 ppm and zircon is 9,420–100,000 ppm. Avaibil","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82701195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studi Karakteristik Air-Tanah di Kawasan Nuklir Pasar Jumat (KNPJ) dengan Metode Hidrokimia dan Isotop Alam","authors":"Neneng Laksminingpuri Sanusi, Nurfadhlini Nurfadhlini, Satrio Satrio","doi":"10.17146/EKSPLORIUM.2018.39.1.4100","DOIUrl":"https://doi.org/10.17146/EKSPLORIUM.2018.39.1.4100","url":null,"abstract":"Telah dilakukan penelitian air-tanah di Kawasan Nuklir Pasar Jumat (KNPJ) menggunakan metode hidrokimia dan isotop alam. Penelitian dilakukan dengan mengambil sejumlah sampel air di beberapa kawasan KNPJ dan sekitarnya. Sampel air tersebut kemudian dianalisis konsentrasi kimia airnya (anion-kation) dan konsentrasi isotop alam d2H dan d18O menggunakan alat lasser counter. Analisis kimia air dilakukan menggunakan metode ion kromatografi dan titrasi. Tujuan penelitian ini, yaitu untuk mengetahui karakteristik air-tanah terhadap kemungkinan interaksi dengan air permukaan sekitarnya. Berdasarkan hasil analisis hidrokimia (anion-kation) dan isotop alam (d2H, d18O) menunjukkan bahwa air-tanah dalam masih mencerminkan karakter sebagai air-tanah segar atau freshwater. Air-tanah akuifer dalam juga terindikasi tidak berhubungan dengan air-tanah akuifer dangkal yang berada di atasnya. Air-tanah dangkal, sebagian besar masih menunjukkan karakter air-tanah segar dan sebagian lainnya, yaitu SB-8, SB-9, dan SB-10, air-tanahnya mengalami pertukaran ion dan interaksi dengan air permukaan. Air permukaan untuk SB-8 diperkirakan berasal dari rembesan larutan pupuk tanaman sedangkan untuk SB-9 dan SB-10 air permukaan diperkirakan berasal dari rembesan tanki kotoran (septic tank). Groundwater research has been conducted in Nuclear Area of Pasar Jumat (KNPJ) using hydrochemical data and natural isotopes methods. The research was conducted by taking a number of water samples in some areas of KNPJ and also its surrounding areas. The water samples were then analyzed its hydrochemical concentration (anion-cation) and natural isotope concentration d2H and d18O using lasser counter device. Water chemical analysis was conducted by using ion chromatography and titration methods. The purpose of this research is to know the characteristics of groundwater to the possibility of its interaction with the surrounding surface water. Based on the results of hydrochemical analysis (anion-cation) and natural isotopes (d2H, d18O) indicates that groundwater still reflects the character as fresh groundwater or freshwater. The deep aquifer groundwater is also indicated to be unrelated to groundwater of shallow aquifers located above it. While most shallow groundwater still show the character of fresh groundwater, and some others namely SB-8, SB-9, and SB-10, the groundwater undergo ion exchanges and interact with surface water. Surface water for SB-8 is estimated come from the seepage of the liquid plant fertilizer, whereas for SB-9 and SB-10 surface water is estimated come from septic tank seepage.","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"518 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85650647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laju Sedimentasi di Dataran Banjir Sungai Ciujung Hulu Berdasarkan Profil Pb-210 Excess","authors":"B. Aliyanta, Nita Suhartini","doi":"10.17146/eksplorium.2018.39.1.4165","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.1.4165","url":null,"abstract":"Laju deposisi sedimen di dataran banjir merupakan salah satu komponen dalam budget sedimen daerah aliran sungai (DAS). Oleh karena itu, perlu dilakukan perhitungan estimasi laju deposisi sedimen di dua lokasi dataran banjir berdasarkan penanggalan umur sedimen dengan teknik Pb-210 excess. Core sedimen diambil di dataran banjir Sungai Ciujung Hulu tiap interval kedalaman 10 cm sampai kedalaman 120 cm. Sedimen yang didapat dikeringkan, diayak, ditimbang 150–300 gr, ditempatkan dalam wadah khusus dan ditutup rapat. Setelah sebulan dalam kondisi tertutup rapat, sampel diukur dengan spektrometer gamma Multichannel analyzer (MCA) untuk mengetahui aktivitas Pb-210 total dan Pb-210 supported. Berdasarkan data Pb-210 total dan Pb-210 supported, terdapat tiga cara berbeda untuk mendapatkan profil Pb-210 excess. Data Pb-210 excess yang diperoleh digunakan untuk menghitung umur sedimen berdasarkan metode constant of the rate of supply (CRS). Melalui umur tiap perlapisan sedimen ini, dapat diketahui adanya zona peralihan laju deposisi sedimen di kedua lokasi. Laju sedimentasi berkisar 1,028 cm/tahun dari tahun 1968 s/d 1987, dan naik menjadi sekitar 2,83 cm/tahun dari tahun 1987–2016 (28,95 tahun) di lokasi 1. Di lokasi 2, laju sedimentasi berkisar 0,676 cm/tahun dari tahun 1950–1993, dan naik menjadi kisaran 3,231 cm/tahun dari kurun waktu tahun 1993–2016 (23 tahun). The rate of deposition of sediment on the floodplain area is one of the constituent component of the sediment budget in watersheds. Therefore, the sedimentation rate estimation has been made in two locations of the floodplains based on the age sediment obtained using Pb-210 excess technique. Sediment cores were taken in the Ciujung Hulu River floodplain every 10 cm depth intervals up to a depth of 120 cm. Sediment was obtained then dried, disaggregated, sifted, weighing 150–300 gr, placed into the special containers and tightly closed. After a month in a sealed condition, samples were measured using gamma spectrometer Multichannel analyzer (MCA) to find out the activity of Pb-210 total and Pb-210 supported. Based on the data of Pb-210 total and Pb-210 supported, there are three different ways to get Pb-210 excess profiles. Obtained Pb-210 excess data is used to calculate the age of the sediments on the basis of the method of constant rate of supply (CRS). Through the age of sediment layers, can be recognized the existence of transitional zone of sediment deposition rate at both locations. The rate of sedimentation ranged from 1.028 cm/year from the years 1968–1987, and rose to about 2.83 cm/year from the years 1987–2016 (28.95 years) at location 1. While in location 2, the rate of sedimentation ranged 0.676 cm/year from the years 1950–1993, and rose to about 3.231 cm/year from the years 1993–2016 (2 years).","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80589497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Penurunan Kadar Torium dan Radioaktivitas dalam Limbah Cair Proses Pengolahan Monasit PLUTHO Menggunakan Koagulan FeSO4","authors":"Dany Poltak Marisi, S. Suprihatin, Andes Ismayana","doi":"10.17146/eksplorium.2018.39.1.4276","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.1.4276","url":null,"abstract":"Pemisahan unsur radioaktif dan logam tanah jarang yang dilakukan di PLUTHO menghasilkan limbah yang masih mengandung torium dan uranium. Limbah yang dihasilkan memerlukan pengolahan lanjutan agar ramah lingkungan. Tujuan penelitian adalah menurunkan kadar torium dan radioaktivitas dalam limbah cair proses pengolahan monasit pilot plant PLUTHO menggunakan koagulan fero sulfat. Pilot Plant PLUTHO merupakan suatu fasilitas yang didirikan untuk untuk memisahkan uranium, torium, dan logam tanah jarang (LTJ) dari mineral monasit dan mineral lainnya dalam skala pilot. Perlakuan variasi yang dilakukan pada penelitian adalah dosis koagulan dan pH. Pengukuran kadar torium dilakukan dengan metode Spektrofotometer UV-Vis, sedangkan pengukuran radioaktivitas dilakukan dengan alat ukur radiasi Ludlum Model 1000 Scaler. Hasil penelitian menunjukkan kondisi optimum koagulasi pada pH 8,0 dengan dosis koagulan FeSO4 225 mg/L yang dapat menurunkan kadar torium sebesar 45,20 % dan menurunkan radioaktivitas sebesar 100 % dari kadar torium dan radioaktivitas awal yaitu 0,73 mg/L dan 1,35 Bq/g. The separation of radioactive and rare earth mineral carried out in PLUTHO produces waste that still contains thorium and uranium. The resulting waste requires further processing to be environmentally friendly. The purpose of study is to reduce thorium content and radioactivity in liquid waste of PLUTHO monazite treatment process using ferro sulphate coagulant. PLUTHO Pilot Plant is one of facility that built to dissociate uranium, thorium and light rare earth from mineral of monazite. Variations of treatments applied in the research are coagulant dosage and pH. Thorium content is measured by Spectrophotometer UV-Vis method, whereas radioactivity is measured by radiation counting meter Ludlum Model 1000 Scaler. The result shows that the optimum condition of coagulation is in pH 8,0 with concentration of ferro sulphate 225 mg/L which may reduce thorium content up to 45,20 % and reduce radioactivity to 100 % out of its initial thorium content and radioactivity as much as 0,73 mg/L and 1,35 Bq/g, respectively.","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"55 5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79554524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thorium and Total REE Correlation in Stream Sediment Samples from Lingga Regency","authors":"Ronaldo Irzon","doi":"10.17146/eksplorium.2018.39.1.3558","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.1.3558","url":null,"abstract":"Rare Earth Elements (REE) are found in variety of minerals, which are mobilized by weathering from adjacent watersheds into streambeds and affect the chemical content. A study of stream sediments is useful to trace the source of metals, as they are representative of the composition of the drainage basin. This study describes trace and rare earth elements geochemistry composition of selected nine stream sediment samples from two major Islands in Lingga Regency, namely Singkep and Lingga. Moreover, the associations of rare earth elements abundance to other elements in selected samples are used on tracing the most possible mineral as REE source. Nine selected stream sediments were identified megascopically and measured for the trace and rare earth elements composition by inductively coupled plasma – mass spectrometry (ICP-MS). The selected samples from Lingga yielded very strong average Zr, Mn, Ba, and Rb compositions of 246 ppm, 172 ppm, 126 ppm, and 84 ppm, respectively. On the other hand, Zr, Mn, Cr, and Rb are the top four abundant trace elements from Singkep with consecutive median value of 486 ppm, 305 ppm, 145 ppm, and 85 ppm. Feltilizer for agricultural area at Lingga most posibly contain As and Rb upon these elements abundances and association. Tin mine activity was found to influence the streambeds composition with low Rb-Cs composition but high Zr-REE abundance. Very strong Th to ∑REE association suggests that thorium-bearing mineral, especially monazite-La, is the main REE source of the selected samples. All of the studied samples exhibit Eu negative anomaly to imply the absence of either detrital apatite or chemical weathering of apatite. Moreover, REE of Lingga stream sediments is averagely more fractionated than Singkep. Unsur Tanah Jarang (UTJ) terkandung dalam berbagai jenis mineral yang dapat termobilisasi akibat pelapukan dari daerah aliran sungai terdekat, terendapkan, dan mempengaruhi kandungan kimianya. Studi mengenai sedimen sungai dapat dimanfaatkan untuk menelusuri sumber logam, sebagaimana sedimen tersebut merupakan bahan penyusun dasar sungai. Penelitian ini menerangkan kandungan geokimia unsur jejak dan tanah jarang dari sembilan contoh sedimen sungai terpilih dari dua pulau besar di Kabupaten Lingga, yaitu: Singkep dan Lingga. Selanjutnya, asosiasi kelimpahan unsur tanah jarang terhadap unsur lain dipergunakan untuk menelusuri mineral yang paling mungkin sebagai sumber UTJ. Sembilan contoh sedimen sungai terpilih telah dideskripsi secara megaskopis dan diukur kandungan unsur jejak dan tanah jarangnya menggunakan inductively coupled plasma – mass spectrometry (ICP-MS). Contoh terpilih dari Pulau Lingga tersusun atas sejumlah tinggi Zr, Mn, Ba, dan Rb, yaitu 246 ppm, 172 ppm, 126 ppm, and 84 ppm secara berurutan. Sementara itu, Zr, Mn, Cr, dan Rb merupakan unsur paling melimpah pada contoh dari Pulau Singkep dengan rataan kelimpahan masing-masing 486 ppm, 305 ppm, 145 ppm, and 85 ppm. Pupuk pertanian di Lingga kemungkinan ","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80176246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship Between Leadership and Commitment with Quality Performance on U-Th-REE Processing Pilot Plant Construction in BATAN","authors":"Nunik Madyaningarum, M. Berawi, P. Miraj","doi":"10.17146/eksplorium.2018.39.1.4161","DOIUrl":"https://doi.org/10.17146/eksplorium.2018.39.1.4161","url":null,"abstract":"Management area of leadership and commitment in the quality management system is a mean to achieve successful functions, even more on construction industry. The objective of this research is to analyze the correlation between leadership and commitment focus management area and quality performance as indicated by rework. Research location is uranium (U), thorium (Th), and rare earth elements (REE) processing pilot plant construction area in Center for Nuclear Minerals Technology-BATAN. Primary data were collected from the 36 of 37 submitted questionnaires, and representing 97 % response rate. The research used descriptive analysis, which depends on the poll and the use of Statistical Package for the Social Sciences (SPSS) main program for data analysis. The relationship between leadership and commitment and quality performance was analyzed using spearman rank correlation coefficient. Findings of research provide guideline and alert to project managers or management of organization where leadership, commitment, infrastructure, and environmental work have moderate to strong correlation to rework level. The results further revealed that there is no relationship between responsibility and authority for the management system and organizational policy and construction quality performance. The research provides evidence, in fact to achieve the quality performance of a pilot plant construction must be concerned with leadership attribute, maintaining commitment and provide support resources on the whole project cycle. Area manajemen kepemimpinan dan komitmen dalam sistem manajemen mutu adalah sarana untuk mencapai keberhasilan suatu pekerjaan, terlebih pada industri konstruksi. Tujuan dari penelitian ini adalah untuk menganalisis hubungan antara area fokus manajemen kepemimpinan, komitmen, dan kinerja kualitas yang ditunjukkan dengan pengerjaan ulang (rework). Lokasi penelitian adalah area kontruksi pilot plant pengolahan uranium (U), torium (Th), dan unsur logam tanah jarang (LTJ) di Pusat Teknologi Bahan Galian Nuklir-BATAN. Data primer merupakan hasil 36 dari 37 kuisioner yang dikirimkan, dan mewakili tingkat respons 97 %. Penelitian ini menggunakan analisis deskriptif, yang bergantung pada polling dan menggunakan program utama Paket Statistik untuk Ilmu Pengetahuan Sosial (SPSS) untuk analisis data. Hubungan antara kepemimpinan dan komitmen dan kinerja kualitas dianalisis dengan menggunakan koefisien korelasi pemeringkatan spearman. Hasil penelitian memberikan panduan dan peringatan kepada manajer proyek atau manajemen organisasi bahwa kepemimpinan, komitmen, dan infrastruktur serta lingkungan kerja memiliki korelasi menengah hingga sangat kuat terhadap tingkat pengerjaan ulang. Hasil lainnya mengungkapkan bahwa tidak ada hubungan antara tanggung jawab dan wewenang sistem manajemen serta kebijakan organisasi dengan kinerja kualitas konstruksi. Penelitian ini memberikan bukti bahwa sebenarnya untuk mencapai kinerja kualitas konstruksi pilot plant harus ","PeriodicalId":11616,"journal":{"name":"EKSPLORIUM","volume":"319 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77137015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}