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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
Editor in Chief :
Volume & Issues
Volume 35, Issue 7 - Dec 2014
Volume 35, Issue 6 - Oct 2014
Volume 35, Issue 5 - Sep 2014
Volume 35, Issue 4 - Aug 2014
Volume 35, Issue 3 - Jun 2014
Volume 35, Issue 2 - Apr 2014
Volume 35, Issue 1 - Feb 2014
Selecting the target year
Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution
You, Don-Sang ; Park, Cheon-Young ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 401~411
DOI : 10.5467/JKESS.2014.35.6.401
In order to enhance the Au Ag leach rate, a mechanochemical activation process and a mixed thiourea-thiocyanate solution has been applied to Au concentrate. To achieve mechanochemical activation, the Au concentrate was mechanically ground using a dry and a wet process. The results of a particle size distribution analysis and an XRD analysis, average particle size and crystallite size were much smaller in the dry-sample than in the concentrate sample. As well the size was smaller in the wet-sample than in the dry-sample. In SEM and XRD analysis, the amorphization effect was observed in the wet-sample due to mechanochemical activation. Au Ag leaching experiments were carried out with a thiourea solution, a thiocyanate solution and a mixed thiourea-thiocyanate solution. The Au Ag leach rate was much greater in the dry-ground-sample than in the concentrate sample, and the leach rate was greater in the wet-ground-sample than in the dry-sample. The Au Ag leach rate was much greater in the thiocyanate solution than in the thiourea solution, and the leaching rate was much greater in the mixed thiourea-thiocyanate solution than in the thiocyanate solution. Up to a 99% leach rate for Au Ag were only achieved in the wet-sample using the mixed thiourea-thiocyanate leaching solution.
Mineral Potential Mapping of Gagok Mine Using 3D Geological Modeling
Park, Gyesoon ; Cho, Seong-Jun ; Oh, Hyun-Joo ; Lee, Chang-Won ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 412~421
DOI : 10.5467/JKESS.2014.35.6.412
In order to develop an effective mineral exploration technique, this study was carried out about the potential mapping of Gagok mine. The deposit model of Gagok mine is widely known. Based on the deposit model, we constructed mining indicator indices using related igneous rocks, faults, and carbonate rocks. By analyzing the spatial correlation between ore and indicator index structures, we decided the weighting values of indices according to the distance from the index structure. The 3D potential mapping was performed using 3D geological model and geological indices. The analyzed potential map verified that the locations and patterns of high potential regions of the results were well matched with those of the known ore bodies. Using the potential mapping results, we could effectively predict the location of a high potential area that has similar geological settings with ore.
Distribution of Fe-Mn Ore in Ugii Nuur, Mongolia Using Magnetic Data
Park, Gyesoon ; Lee, Bum-Han ; Kim, In-Joon ; Heo, Chul-Ho ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 422~428
DOI : 10.5467/JKESS.2014.35.6.422
Korea Institute of Geoscience and Mineral Resources (KIGAM) and Mineral Resources Authority of Mongolia (MRAM) performed a joint survey on Ugii Nuur Fe-Mn mineralized area. Following the survey, we carried out magnetic survey and 3D magnetic susceptibility inversion. Based on the inversion results, basic feasibility study and 3D imaging of Fe-Mn mineralized area were performed using 3D geological modeling technique. Using the distribution of total magnetic field data, we were confirmed for the possibility of horizontal extension of ore bodies from surface outcrops. The 3D magnetic susceptibility model, which is highly related with Fe content, analyzed by inversion shows that the ore bodies of Deposit 1 and Deposit 2 are extended to the underground and ore bodies that are not exposed on the surface are largely distributed in the underground. If we perform the integration analysis using this magnetic susceptibility model and the ore grade data analyzed by drilling survey, it is possible to carry out the effective potential evaluation of Ugii Nuur Fe-Mn ore deposit.
Analysis of Geomagnetic Variations Related to Earthquakes Occurred in and Around the Korean Peninsula from 2009 until 2011
Oh, Seokhoon ; Ji, Yoonsoo ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 429~438
DOI : 10.5467/JKESS.2014.35.6.429
Recent three years of geomagnetic data were analyzed using a method of Principal Component Analysis (PCA) and Wavelet Based Semblance Analysis to investigate any geomagnetic variation caused by earthquakes. This method predicts the geomagnetic variation using the PCA analysis of geomagnetic data, then compares the predicted geomagnetic field with the observation of finding any significant residual. Although it is well known that geomagnetic variation is related with earthquake, most analyses have been limited to some specific cases reflecting the correlation. In this study, we analyze seventeen cases of earthquakes that occurred in and around the Korean peninsula from 2009 to 2011 and that show the precursory and co-seismic relation between the earthquakes and geomagnetic variations.
An Analysis of Oceanic Current Maps of the Yellow Sea and the East China Sea in Secondary School Science Textbooks
Park, Kyung-Ae ; Park, Ji-Eun ; Choi, Byoung-Ju ; Lee, Sang-Ho ; Lee, Eunil ; Byun, Do-Seong ; Kim, Young-Taeg ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 439~466
DOI : 10.5467/JKESS.2014.35.6.439
Since the unification of the diverse oceanic current maps of the East Sea in secondary school science textbooks has recently been accomplished, there have been increasing requirements for the production of a current map of the Yellow Sea (YS) and the East China Sea (ECS). This study, as its first attempt, facilitated the prospective production process of the unified oceanic current maps in YS and ECS by analyzing the maps of scientific articles and those of the present textbooks as of 2014. First of all, the analogue current maps of the textbooks and scientific articles were digitalized to retrieve the characteristics of current maps quantitatively and to make intercomparison of the maps. The currents of both YS and ECS such as the Kuroshio Current, the Taiwan Warm Current, the Tsushima Warm Current, the Yellow Sea Warm Current, the Chinese Coastal Current, the Korea Coastal Current, and the Changjiang River Flow were selected and analyzed. We made 18 items to investigate the paths of the currents. Analyses of the oceanic current maps of secondary school science textbooks and scientific articles with respect to the selected criteria revealed that the current maps of the textbooks were considerably different from the up-to-date knowledge of the current maps acquired from the scientific articles. In addition, since the currents of YS and ECS have strong seasonality, we suggest that they should be presented with at least two current maps for summer and winter in the textbooks, which may go through active discussions among experts.
The Classification Ability with Naked Eyes According to the Understanding Level about Rocks of Pre-service Science Teachers
Park, Kyeong-Jin ; Cho, Kyu-Seong ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 467~483
DOI : 10.5467/JKESS.2014.35.6.467
This study aimed to investigate the classification ability with naked eyes according to the understanding level about rocks of pre-service science teachers. We developed a questionnaire concerning misconception about minerals and rocks. The participants were 132 pre-service science teachers. Data were analyzed using Rasch model. Participants were divided into a master group and a novice group according to their understanding level. Seventeen rocks samples (6 igneous, 5 sedimentary, and 6 metamorphic rocks) were presented to pre-service science teachers to examine their classification ability, and they classified the rocks according to the criteria we provided. The study revealed three major findings. First, the pre-service science teachers mainly classified rocks according to textures, color, and grain size. Second, while they relatively easily classified igneous rocks, participants were confused when distinguishing sedimentary and metamorphic rocks from one another by using the same classification criteria. On the other hand, the understanding level of rocks has shown a statistically significant correlation with the classification ability in terms of the formation mechanism of rocks, whereas there was no statistically significant relationship found with determination of correct name of rocks. However, this study found that there was a statistically significant relationship between the classification ability with regard to formation mechanism of rocks and the determination of correct name of rocks.
The Analysis of High School Students' Conceptions on Plate Tectonics
Lee, Mi-Suk ; Jeong, Jin-Woo ; Kim, Hyoungbum ;
Journal of the Korean earth science society, volume 35, issue 6, 2014, Pages 484~497
DOI : 10.5467/JKESS.2014.35.6.484
This study aimed to investigate high school students' conceptions of plate tectonics. Seventy students (N=70) in their 2 year of high schools in the province of Chungcheong-do participated in this study, and they took a conception test of visual representation. We conducted a semi-structured interview with 10 volunteering participants out of seventy. After learning about the concept of plate tectonics, this study found that participants ended up having alternative conceptions relating to terminology, meaning of colors, plates' movement, plates' boundaries, position and cause of melting, mantle's physical conditions, and driving forces of plate motion. The conceptions that the participants held after class were organically related, which included the meaning of colors, mantle's physical characteristic, and driving forces of plate movement. In addition, the visual representation used for teaching plate tectonics influenced the students' understanding about terminologies, plates' boundaries, position of melting, and the physical characteristic of mantle. The study found that there were the factors of visual representation that caused the learners to create alternative conceptions in learning about plate tectonics.