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KOTARO YONEZU Last modified date：2022.06.29

Associate Professor / Division of Earth System Engineering
Department of Earth Resources Engineering
Faculty of Engineering


Graduate School
Department of Earth Resources Engineering
Graduate School of Engineering
Undergraduate School
Department of Earth Resources,Marine and Civil Engineering
School of Engineering
Other Organization
Other
Research Center for Environmental Engineering


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Homepage
https://kyushu-u.pure.elsevier.com/en/persons/kotaro-yonezu
　Reseacher Profiling Tool　Kyushu University Pure
Phone
092-802-3313
Fax
092-802-3368
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
No
Field of Specialization
Geochemistry,Resources and Environmental Geology
Total Priod of education and research career in the foreign country
02years03months
Outline Activities
・Research topics
Formation mechanism of epithermal gold deposit
Effect of redox condition during the mineralization
Construction of recycle system for precious metals
Formation mechanism of rare earth elements deposit
Effective utilization of geothermal water as mineral sources
Prevention of silica scaling and monitoring of scale formation at geothermal power plant
Geochemical behavior of REE and PGE in laterite
Mineral and Geothermal Resources Exploration in Southeast Asia and North Africa
New Development of reference material for trace analysis
Exploration of sea floor mineral resources
Geothermal Geology
Experimental Geochemistry (e.g., Formation mechanism of BIF (banded Iron Formation))
Research
Research Interests
  • 1. Formation mechanism of epithermal gold deposit
    2. Construction of recycle system of precious metals
    3. Formation mechanism of rare earth elements deposit
    4. Effective utilization of geothermal water as mineral sources
    5. Prevention of silica scaling and monitoring technology development at geothermal power plant
    6. Metal resources and geothermal potential exploration in Asia-Africa area
    7. Geochemical behavior of REE and PGE in laterite
    8. Preparation of reference material for in situ trace analysis and redox condition
    9. Exploration of hydrothermal sea floor ore deposits
    10. Geochemical experiment of synthesis of ore deposit
    keyword : metal deposits, hydrothermal system, recycle, precious metals, rare metals, experimental geochemistry, laterite, hydrothermal sea floor deposit, redox, solubility, silica scale, geothermal geology
    2010.10～2023.03.
Current and Past Project
  • Collaboration research through human resource development under ASEAN University Network/Southeast Asia Engineering Education Development Network (AUN/SEED-Net)
Academic Activities
Books
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1. KOTARO YONEZU, Koichiro Watanabe, Aung Zaw Myint, Mat Thwe Aye, Proceedings of 7th Asia Africa Mineral Resources Conference, 2017.11.
2. KOTARO YONEZU, Koichiro Watanabe, Proceedings of 6th Asia Africa Mineral Resources Conference, 2016.09.
3. Carla Dimalanta, Betchaida Payot, Jillian Gabo, KOTARO YONEZU, Koichiro Watanabe, Proceedings of 5th Asia Africa Mineral Resources Conference, 2015.07.
4. KOTARO YONEZU, Koichiro Watanabe, Proceedings of 4th Asia Africa Mineral Resources Conference, 2014.10.
5. KOTARO YONEZU, Koichiro Watanabe, Proceedings of 3rd Asia Africa Mineral Resources Conference, 2013.09.
6. KOTARO YONEZU, Akihiro Yamashita, Koichiro Watanabe, Proceedings of 2nd Asia Africa Mineral Resources Conference, 2012.09.
7. Kotaro Yonezu, Akihiro Yamashita and Koichiro Watanabe, Proceedings of 1st Asia Africa Mineral Resources Conference, 2011.12.
Reports
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1. Hironori OHASHI, Kotaro YONEZU, Daisuke KAWAMOTO, and Takushi YOKOYAMA, Investigations on Adsorption of Inorganic Ions in Aqueous Solution to Some Metal Oxides, Hydroxides and a Carbonate by the X-Ray Spectroscopic Method, Analytical Science, 10.2116/analsci.20SAR20, 2021.10.
Papers
 Show All Papers >>
1. Juhri, S., Yonezu, K., Inoue, H., Kiyota, Y., Ohshima, S., Uemura, H., Uchiyama, N., Ueda, A., Yokoyama, T, Precipitation behavior of iron and silicic acid when mixing acidic and weakly alkaline geothermal waters at the Hatchobaru geothermal power plant, Oita, Japan, Geothermics, 104, 102470, 2022.09.
2. Tagomori, K., Kioka, A., Nakagawa, M., Ueda, A., Sato, K., Yonezu, K., Anzai, S, Air nanobubbles retard calcite crystal growth, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 648, 129319, 2022.05.
3. Ueda, A., Ozawa, A., Unami, S., Kusakabe, M., Hirayama, N., Mogi, K., Ikeda, M., Yokoyama, T., Yonezu, K., Recovery of silica from saline geothermal brine at the Yamagawa Power Plant for inhibition of scale formation by batch- and circulation-tests using cationic flocculant and quicklime, Geothermics, 99, 102312, 2022.02.
4. Youssouf SAMOD, Kotaro YONEZU, Thomas TINDELL, LINEAMENT EXTRACTION AND ANALYSIS USING REMOTE SENSING IN NORD-GHOUBBET GEOTHERMAL FIELD, DJIBOUTI, Proceedings of 43rd New Zealand Geothermal Workshop, 29, 2022.02.
5. K. Abe, M. Fujisaki, S. Taguchi, H. Chiba, Yi-Chia-Lu, Shen-Rong Song, Jiin-Fa Li, Po-Tsun Li, Chi-Hsuan Chen, K. Yonezu, Hydrothermal alteration of exploration wells SYK-01 and YMS-95-01 drilled in the Tatun Volcano Group, northern Taiwan, Proceedings of 1ST INTERNATIONAL SYMPOSIUM ON EARTH RESOURCES AND GEO-ENVIRONMENTAL TECHNOLOGY 2022 (EraGET2022) GEO-RESOURCES AND GEOSCIENCES, 2022.02.
6. K. Tsuru, S. Juhri, K. Yonezu, S. Miyabe, T. Yokoyama, A study on the inhibition of calcium-bearing scales in geothermal water, Proceedings of 1ST INTERNATIONAL SYMPOSIUM ON EARTH RESOURCES AND GEO-ENVIRONMENTAL TECHNOLOGY 2022 (EraGET2022) GEO-RESOURCES AND GEOSCIENCES, 2022.02.
7. Jinghua Wu, Hua Konga, Huan Li, Thomas J. Algeocde, Kotaro Yonezu, Biao Liu, Qianhong Wu, Dapeng Zhu, Hua Jianga, Multiple metal sources of coupled Cu-Sn deposits: Insights from the Tongshanling polymetallic deposit in the Nanling Range, South China, Ore Geology Reviews, https://doi.org/10.1016/j.oregeorev.2021.104521, 2021.12.
8. Pagna LIM, Akira IMAI, Kotaro YONEZU, Thomas TINDELL and Sitha KONG, Petrography and Fluid Inclusion Microthermometry of Skarn-type Copper Mineralization from STD-11 Drill Hole in the Phnom Malu Area, Northern Cambodia, Proceedings of International Symposium on Earth Science and Technology 2021, 33-38, 2021.11.
9. Manuel NOPEIA, Akira IMAI, Ryohei TAKAHASHI, Daúd JAMAL, Andrea AGANGI, Kotaro YONEZU and Thomas TINDELL, Host Rock and Ore Geochemistry of the Nanlia and Makorongo Gold Prospects, Mozambique Belt, Northeastern Mozambique: Implications for Ore Genesis, Proceedings of International Symposium on Earth Science and Technology 2021, 39-44, 2021.11.
10. Saefudin Juhri, Kotaro YONEZU, Agung HARIJOKO and Takushi YOKOYAMA, Kinetics of the Early-stage Deposition of Siliceous Scale on Cu/Ti Metal Plates: A Case Study at Dieng Geothermal Power Plant, Proceedings of International Symposium on Earth Science and Technology 2021, 153-158, 2021.11.
11. Samod Youssouf, Kotaro YONEZU, Gulf Basalt Mapping Using Sensitive Bands for Landsat 8 in Nord-Ghoubbet Geothermal Field, Proceedings of International Symposium on Earth Science and Technology 2021, 202-206, 2021.11.
12. Kov Rathanak, Sirisokha Seang, Kakda Kret, Oy Kimhouy, Sophea Boeut, Jaydee Ammugauan, Sitha Kong, Kotaro Yonezu, Koichiro Watanabe, Tola Sreu and Seangleng Hoeu, Preliminary Study on Lithology, and Geochemical Characteristics for Gold and Copper Deposits in Area 1, Phnom Sro Ngam, Kompot Province, Southwest Cambodia, Proceedings of International Symposium on Earth Science and Technology 2021, 330-333, 2021.11.
13. Suy try Ly, Sisisokha Seang, Kakda Kret, Oy Kimhouy, Sophea Boeut, Jaydee Ammugauan, Sitha Kong, Kotaro Yonezu, Koichiro Watanabe, Tola Sreu and Seangleng Hoeu, Preliminary Study on Lithology, Hydrothermal Alteration and Soil/Rock Geochemistry for Gold and Copper at Area 6, Phnom Sro Ngam Tenement, Chhouk District, Kampot Province, Cambodia, Proceedings of International Symposium on Earth Science and Technology 2021, 334-337, 2021.11.
14. Solomon Tekie, Kotaro YONEZU, Thomas TINDELL, Sachihiro TAGUCHI and Akira IMAI, Geochemical Characterization and Hydrothermal Alteration of Noya Geothermal Field in North-Eastern Kyushu, Japan, Proceedings of International Symposium on Earth Science and Technology 2021, 383-386, 2021.11.
15. Zhekai Zhou, Kotaro Yonezu, Akira Imai, Thomas Tindell, Huan Li, Jillian Aira Gabo-Ratio, Trace elements mineral chemistry of sulfides from the Woxi Au-Sb-W deposit, southern China, Resource Geology, https://doi.org/10.1111/rge.12279, 2021.09.
16. Jinghua Wu, Yuanlin Chen, Chaoyang Zheng, Huan Li, Kotaro Yonezu, Yuyu Tang, Qi Zong, Genesis of the Longkou–Tudui gold deposit, Jiaodong Peninsula, eastern China: Constraints from zircon U-Pb dating, fluid inclusion studies and C–H–O–S stable isotopes, Ore Geology Reviews, https://doi.org/10.1016/j.oregeorev.2021.104449, 2021.09.
17. Htet Sandar Aung, Kotaro Yonezu, Akira Imai, Thomas Tindell, Koichiro Watanabe, Gold mineralization of the Thone Myae Song area, Sagaing Region, northern Myanmar, Journal of Asian Earth Sciences, https://doi.org/10.1016/j.jseaes.2021.104749, 131, 2021.07.
18. Tomy Alvin Rivai, Syafrizal, Kotaro Yonezu, Kenzo Sanematsu and Koichiro Watanabe, Nature of Ore Fluid at the Sopokomil Zn-Pb Deposit, North Sumatra, Indonesia: Implications for Metal Transport and Sulfide Deposition, Geosciences, https://doi.org/10.3390/geosciences11070298, 11, 7, 298, 2021.07.
19. Omar B. Soberano, Jillian Aira S. Gabo-Ratio, Karlo L. Queaño, Carla B. Dimalanta, Graciano P. Yumul Jr., Eric S. Andal, KotaroYonezu, Adrian J. Boyce, Mineral chemistry, fluid inclusion and stable isotope studies of the Suyoc epithermal veins: Insights to Au-Cu mineralization in southern Mankayan Mineral District, Philippines, Ore Geology Reviews, https://doi.org/10.1016/j.oregeorev.2021.104035, 131, 2021.04.
20. Tatsuo Nozaki, Toshiro Nagase, Yutaro Takaya, Toru Yamasaki, Tsubasa Otake, Kotaro Yonezu, Kei Ikehata, Shuhei Totsuka, Kazuya Kitada, Yoshinori Sanada, Yasuhiro Yamada, Jun‑ichiro Ishibashi, Hidenori Kumagai, Lena Maeda & the D/V Chikyu Expedition 909 Scientists, Subseafloor sulphide deposit formed by pumice replacement mineralisation, Scientific Reports, https://doi.org/10.1038/s41598-021-87050-z, 11, 8809, 2021.04, Seafloor massive sulphide (SMS) deposits, modern analogues of volcanogenic massive sulphide (VMS) deposits on land, represent future resources of base and precious metals. Studies of VMS deposits have proposed two emplacement mechanisms for SMS deposits: exhalative deposition on the seafloor and mineral and void space replacement beneath the seafloor. The details of the latter mechanism are poorly characterised in detail, despite its potentially significant role in global metal cycling throughout Earth’s history, because in-situ studies require costly drilling campaigns to sample SMS deposits. Here, we interpret petrographic, geochemical and geophysical data from drill holes in a modern SMS deposit and demonstrate that it formed via subseafloor replacement of pumice. Samples from the sulphide body and overlying sediment at the Hakurei Site, Izena Hole, middle Okinawa Trough indicate that sulphides initially formed as aggregates of framboidal pyrite and matured into colloform and euhedral
pyrite, which were replaced by chalcopyrite, sphalerite and galena. The initial framboidal pyrite is closely associated with altered material derived from pumice, and alternating layers of pumiceous and hemipelagic sediments functioned as a factory of sulphide mineralisation. We infer that anhydrite rich layers within the hemipelagic sediment forced hydrothermal fluids to flow laterally, controlling precipitation of a sulphide body extending hundreds of meters..
21. Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas David Tindell, Kenzo Sanematsu, Koichiro Watanabe, Controls on the disseminated Ni-Cu-PGE sulfide mineralization at the Tubane section, northern Molopo Farms Complex, Botswana
Implications for the formation of conduit style magmatic sulfide ores, Ore Geology Reviews, 10.1016/j.oregeorev.2020.103731, 126, 2020.11, The Molopo Farms Complex (MFC) is located near the western margin of the Archean Kaapvaal Craton, in southern Botswana. The complex hosts low grade disseminated Ni-Cu and platinum group elements (PGE) mineralization restricted to the lower ultramafic cumulates, notably in the feldspathic orthopyroxenites. The mineralized feldspathic orthopyroxenites contain up to 0.47 ppm Pt + Pd + Au manifested in the form of platinum group mineral (PGM) assemblages dominated by PGE bismuthotellurides, asernides and minor Au and Ag alloys. The PGM encountered are froodite (PdBi2), moncheite (PtTe2), michenerite (PdBiTe), sperrylite (PtAs2) largely associated with altered silicates and sulfide minerals. The association of PGM with sulfides suggests that they were originally concentrated by sulfide melt, while late stage reaction of sulfides with hydrothermal fluids resulted in the observed spatial proximity of PGM with altered silicates. The Cu/Pd ratios of most of the rocks fall within the primitive mantle range. However, the Cu/Pd ratios of the feldspathic orthopyroxenites are more variable, with few samples falling above and below the primitive mantle range suggesting the prior sulfide extraction from the magmas and the presence of cumulus sulfides. This is supported by the Cu/Zr ratios of these rocks which are also variable above and below unity. Trace element ratios on the (Th/Yb) PM versus (Nb/Th) PM plot indicate strong crustal contamination across all units including those not in proximity to the country rocks. The δ34S of the magmatic rocks are variable between −6.3‰ and −11.4‰. In contrast, the δ34S of dolomitic siltstones of the Transvaal Supergroup which constitute the immediate country rocks vary from −4.1‰ to +0.6‰. These data indicate that crustal contamination largely occurred prior to magma emplacement. It is inferred that the most important contaminant and source of crustal S were the Ramotswa and Ditlhojana Formations that include sulfidic shales at depth. We consider that magnesian basaltic magmas of B1 Bushveld magma composition underwent crustal contamination, assimilation of crustal S and segregation of sulfide melt in the feeder conduit or staging-chamber prior to final magma emplacement. The feeder conduit or staging-chamber was subsequently invaded by further B1 magma. This magma entrained some of the sulfides lodged in the plumbing system and flushed them to the final MFC chamber studied here. After the staging-chamber had already partially solidified, it was invaded by yet another influx of magma, possibly even more primitive than the B1 Bushveld magma. Being a crystal mush, this magma assimilated and entrained some of the previously formed orthopyroxenites manifested by fragments of orthopyroxenite in the harzburgites of the final MFC chamber. The presence of centimeter-sized globular sulfides and fragments of orthopyroxenite within harzburgites suggests that the complex was emplaced as separate pulses of magmas. Therefore, it is considered that sulfide accumulations may remain undiscovered in the feeder zones or the staging-chamber..
22. Onchanok Juntarasakul, Kotaro Yonezu, Daisuke Kawamoto, Hironori Ohashi, Yasuhiro Kobayashi, Takeharu Sugiyama, Koichiro Watanabe and Takushi Yokoyama, Chemical state of Fe3+ in a Fe3+-type cation exchange resin for the removal and recovery of phosphate ions and the adsorption mechanism of phosphate ion to the resin, Colloids and Surfaces A: Physicochemical and Engineering Aspects, https://doi.org/10.1016/j.colsurfa.2020.125314, 605, 2020.11.
23. Kentaro ABE, Genshi TOYOTA, Myo Kyaw HLAING, Sai Pyae SONE and Kotaro YONEZU, Mineralization and Alteration in Mahar San Prospect, Sagaing Region, Northern Myanmar, Proceedings of International Symposium on Earth Science and Technology 2020, 43-48, 2020.11.
24. Yushi SEKIYA, Nobuhiro MUKAE, Kotaro YONEZU, Thomas D. TINDELL, Jun-ichiro ISHIBASHI, Tatsuo NOZAKI and Akira IMAI, Formation Condition of Submarine Hydrothermal Ore Deposits Revealed by Fluid Inclusions Microthermometry and Mineral Assemblage at the Hakurei Site, Izena Hole, Middle Okinawa Trough, Proceedings of International Symposium on Earth Science and Technology 2020, 55-59, 2020.11.
25. Yuji GONOI, Akira IMAI, Kotaro YONEZU, Thomas D. TINDELL, Jun-ichiro ISHIBASHI and Koichiro WATANABE, Chemical Properties of Epidote and Prehnite in the Sanjin Deposit, Hishikari Mine, Japan, Proceedings of International Symposium on Earth Science and Technology 2020, 61-65, 2020.11.
26. Youssouf SAMOD, Kotaro YONEZU and Nureddin SAADI, Hydrothermal Alteration Mapping Using Landsat 8 Image in Hanle Geothermal Prospect, Djibouti, Proceedings of International Symposium on Earth Science and Technology 2020, 90-95, 2020.11.
27. Saefudin JUHRI, Kotaro YONEZU, Agung HARIJOKO and Takushi YOKOYAMA, Study on the Removal of Silicic Acid as Silica from Geothermal Water: A Case Study at Dieng Geothermal Power Plant, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2020, 96-101, 2020.11.
28. Zhekai ZHOU, Kotaro YONEZU, Akira IMAI, Thomas D. TINDELL and Huan Li, Trace Elements Mineral Chemistry of the Sulfides from the Woxi Au-Sb-W Deposit, Southern China, Proceedings of International Symposium on Earth Science and Technology 2020, 125-130, 2020.11.
29. Myo kyaw HLAING, Kotaro YONEZU, May Thwe AYE and Koichiro WATANABE, The Ore Mineralogy of the Thae Phyu Chaung Au-Ag-Bi-Te Mineralization in the Kyaikhto District, Mon State, Southern Myanmar, Proceedings of International Symposium on Earth Science and Technology 2020, 348-353, 2020.11.
30. Myo kyaw HLAING, Kotaro YONEZU, May Thwe AYE and Koichiro WATANABE, Nature of Ore-forming Fluids and P-T Conditions of the Thae Phyu Chaung Au-Ag-Bi-Te Mineralization in the Kyaikhto District, Mon State, Southern Myanmar, Proceedings of International Symposium on Earth Science and Technology 2020, 354-359, 2020.11.
31. Kohei TSURU, Kotaro YONEZU and Takushi YOKOYAMA, Study on Silica Scale Behavior and Suppression in Geothermal Water by Acidification: A Case Study at Yamagawa Geothermal Power Plant, Japan, Proceedings of International Symposium on Earth Science and Technology 2020, 466-471, 2020.11.
32. Karl D. Jabagat, Jillian Aira Gabo-Ratio,Karlo L. Queaño, Kotaro Yonezu, Carla B. Dimalanta, Yuan-Hsi Lee and Graciano P. Yumul Jr., Petrogenetic constraints on magma fertility in the Baguio Mineral District, Philippines: Probing the mineralization potential of the igneous host rocks in the Sangilo epithermal deposit, Ore Geology Reviews, https://doi.org/10.1016/j.oregeorev.2020.103703, 125, 2020.10.
33. Sachi Kawamoto Masunaga, Yuki Tasaka, Hitoshi Inoue, Kotaro Yonezu, Yumi Kiyota, Koichiro Watanabe and Takushi Yokoyama, Chemical State of Aluminum in Geothermal Water, Proceedings of World Geothermal Congress 2020, 2020.04.
34. Saefudin Juhri, Kotaro Yonezu, Takushi Yokoyama, Agung Harijoko, Muhammad Istiawan Nurpratama , Study on Silica Scaling at Open Canal System, Dieng Geothermal Power Plant, Indonesia , Proceedings of World Geothermal Congress 2020, 2020.04.
35. Agung Harijoko, Saefudin Juhri, Sachihiro Taguchi, Kotaro Yonezu, Koichiro Watanabe, Geochemical indication of formation water influx to the volcanic hosted hot springs of Slamet Volcano, Indonesia, Indonesian Journal on Geoscience, 10.17014/IJOG.7.1.1-14, 7, 1, 1-14, 2020.04, The Slamet Volcano is an active volcano lying above a sedimentary rock substratum with three complexes of geothermal manifestations: Baturaden, Guci, and Paguyangan. In order to understand the characteristic and origin of the geothermal fluid related to the Slamet volcanic system emphasizing the identification of formation water influx represented by sea water signature in the thermal fluid, the water chemistry has been analyzed including stable isotopes of the hot springs, cold springs, shallow groundwater, rainwater, and river water surrounding the Slamet Volcano. The temperature of manifestations is in the range of 42-72°C, while the chloride concentration of the geothermal water is ranging from 17 to 754 mg/L. Specifically, the manifestations in Baturaden are distinctively featured by a huge travertine deposit. The values of Cl/B ratio and non-equilibrium state of the reactive elements indicate the existence of two main geothermal fluid flows discharging as hot springs at Baturaden, Paguyangan, and Guci complexes. Guci hot spring complex shows a similar characteristic as fumarole condensate water from the summit of Slamet Volcano which has been diluted by meteoric water. On the other hand, Baturaden hot spring complex appears to be affected not only by fumarole condensate, but also by the contribution of formation water from marine sedimentary rock. Meanwhile, Paguyangan hot spring is more likely as the outflow of a geothermal reservoir which has also been interacting with marine sedimentary rock. Furthermore, the signature of stable isotope of δ18O and δ2Η shows a significant portion of meteoric water contributing in the dilution of thermal waters..
36. Jerali D. Rodrigo, Jillian Aira S. Gabo‐Ratio, Karlo L. Queaño, Allan Gil S. Fernando, Leopoldo P. de Silva Jr, Kotaro Yonezu, Yu Zhang, Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic, The Deposition Record, https://doi.org/10.1002/dep2.103, 6, 2, 309-330, 2020.01.
37. Myo Kyaw Hlaing, Kotaro Yonezu, May Thwe Aye, Day Wa Aung and Koichiro Watanabe, Geology and Fluid Inclusion Studies on the Shwetagun Gold Mineralization at Yamethin Township, Mandalay Region, Central Myanmar, Proceedings of International Symposium on Earth Science and Technology 2019, 537-541, 2019.12.
38. Sachi Masunaga, Kotaro Yonezu, Koichiro Watanabbe and Takushi Yokoyama, Aluminum Species in Acidic and Neutral pH Geothermal Water, Proceedings of International Symposium on Earth Science and Technology 2019, 520-524, 2019.12.
39. Takaaki Chuuman, Kinnosuke Eguchi, Marina Akinaga, Daisuke Kawamoto, Kotaro Yonezu, Koichiro Watanabbe and Takushi Yokoyama, Polymerization State of Silicic Acid Adsorbed on Anion Exchange Resin 29Si MAS NMR Relaxation Time, Proceedings of International Symposium on Earth Science and Technology 2019, 455-457, 2019.12.
40. Naoto Kugizaki, Kotaro Yonezu, Akira Imai, Jillian Aira S. Gabo-Ratio and Eric S. Andal, Characteristic of Gold Mineralization of the Santoy Vein, Sangilo Mine, Baguio Mineral District, Philippines, Proceedings of International Symposium on Earth Science and Technology 2019, 197-200, 2019.12.
41. Sai Pyae Sone, Kotaro Yonezu, Akira Imai, Koichiro Watanabe and Kenzo Sanematsu, Mineralogy and Geochemistry of Tagun-Khin-Dan Gold Mineralization Area in Slate Belt of Central Myanmar, Proceedings of International Symposium on Earth Science and Technology 2019, 72-77, 2019.12.
42. Htet Sandar Aung, Kotaro Yonezu, Akira Imai, Thomas Tindell, Koichiro Watanabe and May Thwe Aye, Mineralization and Fluid Inclusion Microthermometry in EE3 Gold Prospect, Sagaing Region, Northern Myanmar, Proceedings of International Symposium on Earth Science and Technology 2019, 67-71, 2019.12.
43. Bilegsaikhan Bolor-Erdene, Kotaro Yonezu, Akira Imai, Thomas Tindell and Jargalan Sereenen, Geochemistry, Mineralization and Fluid Inclusion Study of The Bayan-Uul Porphyry Cu-Au-Mo Deposit, Central Mongolia, Proceedings of International Symposium on Earth Science and Technology 2019, 63-66, 2019.12.
44. Yuuki Tada, Kotaro Yonezu, Thomas Tindell, Shu-hei Totsuka, Akira Miyamoto, Jun-Ichiro Ishibashi, Junichi Miyazaki, Ryo Okumura, Yuto Iinuma and Koichi Takamiya, Mineralogical Study of Chimney and Mound Sulfide Ore at the Gondo Hydrothermal Field in the Okinawa Trough, Proceedings of International Symposium on Earth Science and Technology 2019, 59-62, 2019.12.
45. Tomiyuki Yamada, Kotaro Yonezu, Jillian Aira S. Gabo-Ration, R. A. Santos, Marc Raymund L. Zamora, Relation between Concentration of Sc and Ni and Bedrock in Ni Laterite Deposit, Berong in Palawan Island, Philippines, Proceedings of International Symposium on Earth Science and Technology 2019, 55-58, 2019.12.
46. Hiroki Kinoshita, Kyaw Thu Htun, Kotaro Yonezu and Akira Imai, Petrography and Mineralogy of Tin Pegmatite Deposit in the Yamon-kazat Area, Southern Myanmar, Proceedings of International Symposium on Earth Science and Technology 2019, 51-54, 2019.12.
47. Yushi Sekiya, Nobuhiro Mukae, Kotaro Yonezu, Thomas Tindell, Jun-Ichiro Ishibashi, Tatsuo Nozaki and Akira Imai, Characteristics of Ore-forming Fluids at the Hakurei Site, Izena Hole, Middle Okinawa Trough, Proceedings of International Symposium on Earth Science and Technology 2019, 47-50, 2019.12.
48. Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas Tindell, Kenzo Sanematsu and Koichiro Watanabe, Mineralogy and Mineral Associations of Platinum Group Elements in the Ultramafic Cumulates of Molopo Farms Complex at the Tubane Area, Southern Botswana, Proceedings of International Symposium on Earth Science and Technology 2019, 42-46, 2019.12.
49. ＠Kotaro Yonezu, Hitoshi Inoue, Sachi K. Masunaga, Yumi Kiyota, Koichiro Watanabe and Takushi Yokoyama, TWO VIEWPOINTS FOR REMOVAL OF SILICIC ACID FROM GEOTHERMAL WATER TO PREVENT SILICA SCALING, Proceedings of 41st New Zealand Geothermal Workshop, 29, 2019.11.
50. Mohamed Abdillahi Aden, Akira Imai, Kotaro Yonezu, Thomas Tindell, Koichiro Watanabe, SUBSURFACE ALTERATION AND 3D MODELLING IN ASAL-RIFT GEOTHERMAL FIELD, DJIBOUTI., Proceedings of 41st New Zealand Geothermal Workshop, 46, 2019.11.
51. Mizuki Fujisaki, Sachihiro Taguchi, Hitoshi Chiba, Yi-Chia Lu, Shen-Rong Song, Koichiro Watanabe, Kotaro Yonezu, THE CHARACTERISTICS OF HYDROTHERMAL ALTERATION AT STEAMING GROUND IN THE NORTHEASTERN PART OF TATUN VOLCANO GROUP, TAIWAN, Proceedings of 41st New Zealand Geothermal Workshop, 48, 2019.11.
52. Yuji Gonoi, Akira Imai, Kotaro Yonezu, Thomas Tindell, Koichiro Watanabe , NEW IMPLICATION OF WALL ROCK ALTERATION MINERALOGY IN THE HISHIKARI EPITHERMAL GOLD DEPOSIT, JAPAN, Proceedings of 41st New Zealand Geothermal Workshop, 78, 2019.11.
53. Saefudin Juhri, Kotaro Yonezu, Takushi Yokoyama, M Istiawan Nurpratama, Agung Harijoko, FORMATION MECHANISM OF SILICA SCALE IN DIENG GEOTHERMAL POWER PLANT, INDONESIA
, Proceedings of 41st New Zealand Geothermal Workshop, 82, 2019.11.
54. Kawamoto D, Yamanishi Y, Ohashi H, Yonezu K, Honma T, Sugiyama T, Kobayashi Y, Okaue Y, Miyazaki A, Yokoyama T, A new and practical Se(IV) removal method using Fe3+ type cation exchange resin, Journal of Hazardous Materials, 378, 2019.10.
55. Ryo Tamura, Hitoshi Inoue, Eri Hanajima, Risa Ikeda, Yuji Osaka, Takumi Yanaze, Minoru Kusakabe, Kotaro Yonezu, Takushi Yokoyama, Katsuo Tsukamoto, Katsumi Marumo, Akira Ueda, In situ observations of silica nanoparticle growth in geothermal brine at the Sumikawa geothermal station, Japan, by dynamic light scattering, Geothermics, 10.1016/j.geothermics.2018.10.008, 77, 304-312, 2019.01, Silica nanoparticle growth in geothermal brine was examined during the polymerization of silicic acid by observation with dynamic light scattering (DLS) at the Sumikawa geothermal station, examining raw (pH 6.6), pH adjusted (pH 8), and diluted brines (100 to 60%). The monosilicic acid concentration rapidly decreased over time in the raw brine but was almost constant in the samples with lower silicic acid concentrations. The average polysilicic acid particle diameter in the raw brine rapidly increased, from 1 to 6 nm, within 5 min (stage I) and then was almost constant at 7 nm for the subsequent 30 min (stage II)..
56. Takaaki Chuuman, Kinnosuke Eguchi, Marina Akinaga, Daisuke Kawamoto, Shigeki Horii, Kotaro Yonezu, Koichiro Watanabe, Takushi Yokoyama, Inhibition of silicic acid elution during the regeneration of strong base anion exchange resin column, Bulletin of the Chemical Society of Japan, 10.1246/bcsj.20180265, 92, 4, 869-874, 2019.01, To determine why silicic acid elution is often incomplete during regeneration of strong base anion exchange resin columns, an OH
-
type anion exchange resin (OH
-
type resin) adsorbing silicic acid was prepared and the desorption (elution) behavior of silicic acid adsorbed to the resin was examined by batch and column experiments. It was first found that silicic acid adsorbed to an OH
-
type resin polymerizes to form polysilicic acids (Q
1
, Q
2
and Q
3
structures) even when a smaller amount of silicic acid than the ion exchange capacity was adsorbed (unsaturated adsorption). Consequently, elution of silicic acid from the OH
-
type resin column is most likely caused by hydrolytic decomposition of polysilicic acid. Silicic acids with Q
0
, Q
1
and Q
2
structures can be easily desorbed from the OH
-
type resin by immersing them in a 1% NaOH solution for 5min. On the other hand, silicic acid with the Q
3
structure is barely desorbed. In this study, incomplete elution of silicic acid from OH
-
type resin columns has been found to be caused by polymerization of adsorbed silicic acid and the elution behavior may depend on the polymerization mode..
57. Hitoshi Inoue, Kotaro Yonezu, Koichiro Watanabe and Takushi Yokoyama, Removal of Slilicic Acid and Aluminum from Geothermal Water by Adding Calcium Ion, International Symposium on Earth Science and Technology 2018, 23-26, 2018.12.
58. Mohamed Abdillahi Aden, Koichiro Watanabe, Akira Imai, Kotaro Yonezu and Thomas Tindell, Sub-surface Geology of Hydrothermal Alteration and 3D Modelling of the Wells GLC-1, ASAL-3, 4 and 5 in Asal Rift Geothermal, Djibouti, International Symposium on Earth Science and Technology 2018, 33-37, 2018.12.
59. Seang Sirisokha, Tetsuya Nakanishi, Akira Imai, Kotaro Yonezu, Thomas Tindell and Koichiro Watanabe, Hydrothermal Alteration, Mineralization and Fluid Inclusion of the Halo Porphyry Copper-Molybdenum Deposit, Northeastern Cambodia, International Symposium on Earth Science and Technology 2018, 54-60, 2018.12.
60. Kyaw Thu Htun, Kotaro Yonezu, Aung Zaw Myint, Akira Imai, Thomas Tindell and Koichiro Watanabe, Geology, Mineralization, and Fluid Inclusion Characteristics of Sn-W Deposit of the Tagu Area, Myeik, Southern Myanmar, International Symposium on Earth Science and Technology 2018, 64-69, 2018.12.
61. Shota Nakao, Kotaro Yonezu, Thomas Tindell, Mega Fatimah Rosana and Benny Bensaman, Characteristics of Ore-forming Fluid and Mineralization Styles of the DMLZ Skarn Deposit, Ertsberg Mining District, Papua, Indonesia, International Symposium on Earth Science and Technology 2018, 70-75, 2018.12.
62. Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas Tindell and Koichiro Watanabe, Petrology and Mineralization from the Tubane Area, Northern Lobe of Malopo Farms Complex Layered Intrusion Botswana, International Symposium on Earth Science and Technology 2018, 76-81, 2018.12.
63. Shota Inoue, Kotaro Yonezu, Hironori Ohashi and Takushi Yokoyama, Evaluation of Silica Glass Containing Rare Earth Elements as Reference Material: Determination for Geochemical Samples by LAICPMS, International Symposium on Earth Science and Technology 2018, 82-85, 2018.12.
64. Tomiyuki Yamada, Kotaro Yonezu, Jillian A. S. Gabo-Ratio, R. A. Santos, Amilo C. Milaor, and Angilhiza M. Francisco, Geochemical Association between Sc Concentration Mechanism and Bedrock in Nickel Laterite Deposit, Central Dinagat Island, Philippines, International Symposium on Earth Science and Technology 2018, 86-90, 2018.12.
65. Hiroki Kinoshita, Kyaw Thu Htun, Kotaro Yonezu and Akira Imai, Geochemical and Mineralogical Research of Tin Pegmatite in Yamon-Kasat Area, Southern Part of Myanmar, International Symposium on Earth Science and Technology 2018, 91-94, 2018.12.
66. Naoto Kugizaki, Kotaro Yonezu, Akira Imai, Jillian A. S. Gabo-Ratio, Eric S. Andal and Adrian Boyce, Physicochemical Condition of Epithermal Gold Mineralization of the Sesame Vein, Sangilo Mine, Baguio Mineral District, Philippines, International Symposium on Earth Science and Technology 2018, 99-102, 2018.12.
67. Onchanok Juntarasakul, Kotaro Yonezu, Takushi Yokoyama and Koichiro Watanabe, Adsorption Mechanism of Phosphate Ions by Ferric Iron Decorated Cation Exchange Resin, International Symposium on Earth Science and Technology 2018, 103-105, 2018.12.
68. Albano Mahecha, Yutaro Umetsu, Nurredin Saadi, Thomas Tindell, Kotaro Yonezu, Akira Imai and Koichiro Watanabe, Assessment of Carbon Dioxide Flux in Relation to Permeable Structures at Meru Volcano, northern Tanzania, International Symposium on Earth Science and Technology 2018, 206-210, 2018.12.
69. Juhri Saefudin, Kotaro Yonezu, Takushi Yokoyama, Agung Harijoko, Nurpratama, M. I, Deposition Behavior of Silica Scale at Open Canal System, Dieng Geothermal Power Plant, Indonesia, International Symposium on Earth Science and Technology 2018, 373-376, 2018.12.
70. Htet Sandar Aung, Kotaro Yonezu, Akira Imai, Koichiro Watanabe, Thomas Tindell and May Thwe Aye, Preliminary Investigation of Host Rock Geochemistry and Gold Mineralization in EE3 Gold Prospect, Sagaing Region, Northern Myanmar, International Symposium on Earth Science and Technology 2018, 589-594, 2018.12.
71. Sai Pyae Sone, Kotaro Yonezu, Akira Imai and Koichiro Watanabe, The Mineralogical Characteristics of Gold Mineralization in Tagun-Khin-Dan Area in Slate Belt of Central Myanmar, International Symposium on Earth Science and Technology 2018, 595-598, 2018.12.
72. Mizuki. Fujisaki, Sachihiro Taguchi, Hitoshi Chiba, Yi-Cia lu, Hei-Di Lin, Sheng-Rong Song, Po-Tsun Li, Chi-Hsuan Chen, Jiin-Fa Lee, Kotaro Yonezu, Koichiro Watanabe, Hydrothermal Alteration at the Shu-Huang-Ping and Huang-Shan Steaming Ground, Tatun Volcanic Group, Taiwan, International Symposium on Earth Science and Technology 2018, 614-617, 2018.12.
73. Thomas Tindell, Koichiro Watanabe, Akira Imai, Ryohei Takahashi, Adrian J. Boyce, Kotaro Yonezu, Anders Schersten, Laurence Page, Takeyuki Ogata, The Kago low-sulfidation gold and silver deposit
A peripheral mineralisation to the Nansatsu high-sulfidation system, southern Kyushu, Japan, Ore Geology Reviews, 10.1016/j.oregeorev.2017.10.027, 102, 951-966, 2018.11.
74. Guillaume D. Faye, Atsushi Yamaji, Kotaro Yonezu, Thomas Tindell, Koichiro Watanabe, Paleostress and fluid-pressure regimes inferred from the orientations of Hishikari low sulfidation epithermal gold veins in southern Japan, Journal of Structural Geology, 10.1016/j.jsg.2018.03.002, 110, 131-141, 2018.05.
75. Huan Li, Aung Zaw Myint, Kotaro Yonezu, Koichiro Watanabe, Thomas J. Algeo, Jing Hua Wu, Geochemistry and U–Pb geochronology of the Wagone and Hermyingyi A-type granites, southern Myanmar
Implications for tectonic setting, magma evolution and Sn–W mineralization, Ore Geology Reviews, 10.1016/j.oregeorev.2018.03.015, 95, 575-592, 2018.04.
76. Aung Zaw Myint, Kotaro Yonezu, Adrian J. Boyce, David Selby, Anders Scherstén, Thomas Tindell, Koichiro Watanabe, Ye Myint Swe, Stable isotope and geochronological study of the Mawchi Sn-W deposit, Myanmar
Implications for timing of mineralization and ore genesis, Ore Geology Reviews, 10.1016/j.oregeorev.2018.03.014, 95, 663-679, 2018.04.
77. Barbie Ross B. Villaplaza, Alfred Elmer Buena, Nichole Anthony D. Pacle, Betchaida D. Payot, Jillian Aira S. Gabo-Ratio, Noelynna T. Ramos, Carla B. Dimalanta, Decibel V. Faustino-Eslava, Karlo L. Queaño, Graciano P. Yumul, Kotaro Yonezu, Alteration and lithogeochemistry in the Masara gold District, Eastern Mindanao, Philippines, as tools for exploration targeting, Ore Geology Reviews, 10.1016/j.oregeorev.2017.09.004, 91, 530-540, 2017.12.
78. Mourad CHERBAL, Kotaro YONEZU, D. E. AISSA, Thomas D. TINDELL and Koichiro WATANABE, Rare Earth Elements Geochemistry and Mineralogy of Amesmessa Carbonatite from Western Hogger, Southern Algeria

, International Symposium on Earth Science and Technology 2017, 92-97, 2017.12.
79. Yudai HIRANO, Thomas D. TINDELL, Kotaro YONEZU, Koichiro WATANABE and SYAFRIZAL , Ore Mineralogy and Fluid Inclusion Microthermometry of the Talang Santo Low-Sulfidation Deposit, South Sumatra, Indonesia, International Symposium on Earth Science and Technology 2017, 245-250, 2017.12.
80. Shinji KAWAGUCHI, Kotaro YONEZU, Thomas D. TINDELL, Koichiro WATANABE, Jun-ichiro ISHIBASHI, Kazushiro SHIMADA and Tatsuo NOZAKI, The Two Types of Silver Mineralization Processes during Chimney Ore Formation at the Bayonnaise Knoll, Izu-Bonin Arc
, International Symposium on Earth Science and Technology 2017, 251-255, 2017.12.
81. Nobuhiro MUKAE, Kotaro YONEZU, Thomas D. TINDELL, Jun-ichiro ISHIBASHI and Tatsuo NOZAKI , Characteristics of Ore-forming Fluids in Izena Hole, Okinawa Trough, International Symposium on Earth Science and Technology 2017, 262-265, 2017.12.
82. Katsuhito TERASHIMA, Kotaro YONEZU, Thomas D. TINDELL, Adrian BOYCE, Mega F. ROSANA and Benny BENSAMAN, Mineralization Characteristics of the Grasberg Porphyry Cu-Au Deposit, Indonesia: Implication for Ore-forming Fluid Evolution
, International Symposium on Earth Science and Technology 2017, 266-270, 2017.12.
83. Nyein Nyein SINT, Kotaro YONEZU, Thomas D. TINDELL, May Thwe AYE and Koichiro WATANABE , Alteration and Mineralization of Copper-gold Skarn Deposit in Shwe Min Bon Area, Kalaw Township, Southern Shan State, Myanmar, International Symposium on Earth Science and Technology 2017, 281-286, 2017.12.
84. Edward GICHUKI, Kotaro YONEZU and Koichiro WATANABE , Prospecting for Permeable Zones by Spatial Analysis of Radon and CO2 in Soil Gas in the Menengai Geothermal Field, Kenya, International Symposium on Earth Science and Technology 2017, 293-298, 2017.12.
85. Hitoshi INOUE, Kotaro YONEZU, Koichiro WATANABE and Takushi YOKOYAMA , Polymerization of Silicic Acid in Geothermal Water: Bahavior of Aluminum, International Symposium on Earth Science and Technology 2017, 305-310, 2017.12.
86. Yoki KITAYAMA, Kotaro YONEZU, Jillian A. GABO-RATIO, Adrian BOYCE, Jayvhel GUZMAN, Edna LAGUERTA and Rogel SANTOS , Investigation of Sc Hosting Minerals and O and H isotope Analysis for Goethite in Nickel Laterite Deposits, Carrascal and Southern Dinagat Island, Philippines, International Symposium on Earth Science and Technology 2017, 411-415, 2017.12.
87. Seang SIRISOKHA, Tetsuya NAKANISHI, Kotaro YONEZU, Koichiro WATANABE and Bun Kim NGUN , Initial Study on Alteration, Mineralization and Fluid Inclusion Microthermometry in Oyadav South, Ratanakiri, Cambodia, International Symposium on Earth Science and Technology 2017, 421-425, 2017.12.
88. Tomy Alvin RIVAI, Kotaro YONEZU, SYAFRIZAL and Koichiro WATANABE , Preliminary Petrological and Mineralogical Study on Host Rocks and Orebodies in Dairi Zn-Pb±Ag Deposit, North Sumatra, Indonesia, International Symposium on Earth Science and Technology 2017, 426-431, 2017.12.
89. Kyaw Min KHAING, Kotaro YONEZU, May Thwe AYE, Tin Aung MYINT and Koichiro WATANABE , Geology and Mineralogical Characteristic of Wabo Gold Prospect Area, Singu Township, Mandalay Region, Myanmar, International Symposium on Earth Science and Technology 2017, 657-662, 2017.12.
90. Sai Pyae SONE, Kotaro YONEZU, Koichiro WATANABE and Kenzo SANEMATSU , The Characteristics of Epithermal Gold Mineralization at Mong Yu, Shan East, Myanmar, International Symposium on Earth Science and Technology 2017, 668-672, 2017.12.
91. Shota INOUE, Kotaro YONEZU, Hironori OHASHI and Takushi YOKOYAMA , Dispersibility of Rare Earth Elements Doped in Silica Glass: Effect of Total REE and Al, International Symposium on Earth Science and Technology 2017, 673-677, 2017.12.
92. Deris HENDRIAWAN, Kotaro YONEZU, Mega F. ROSANA, Noor Cahyo D. ARYANTO, Geochemical Characteristics of Unconsolidated Sediments in Shallow Marine Area Bangka Island, Indonesia: Implication for Sn Placer Deposit Exploration
, International Symposium on Earth Science and Technology 2017, 678-683, 2017.12.
93. Kyaw Thu HTUN, Kotaro YONEZU, Aung Zaw MYINT, Thomas D. TINDELL and Koichiro WATANABE , Petrological and Mineralogical Characteristics of Sn-W Mineralization in Tagu Prospect, Myeik District, Tanintharyi Region, Myanmar, International Symposium on Earth Science and Technology 2017, 698-701, 2017.12.
94. Fadiah PRATIWI, Kotaro YONEZU, Agung HARIJOKO, Koichiro WATANABE, M. Istiawan NURPRATAMA and ELFINA , Subsurface Hydrothermal Alteration at Patuha Geothermal Field, West Java, Indonesia: Insight from Well PT-1, International Symposium on Earth Science and Technology 2017, 702-705, 2017.12.
95. Kyaw Thu HTUN, Kotaro YONEZU, Aung Zaw MYINT, Thomas D. TINDELL and Koichiro WATANABE , Petrology and Geochemical Studies on Tin Granite in Tagu Prospect, Myeik District, Tanintharyi Region, Myanmar, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
96. Shota NAKAO, Kotaro YONEZU, Thomas D. TINDELL, Mega Fatimah ROSANA and Benny BENSAMAN , Fluid Evolution and Characteristics of Cu-Au Mineralization, DMLZ Deposit, Papua, Indonesia, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
97. Aung Zaw MYINT, Kotaro YONEZU and Koichiro WATANABE, Granite-related Sn-W Mineralization in Dawei, Southern Myanmar
, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
98. R. A. SANTOS, Kotaro YONEZU, J. A. GABO-RATIO, O. T. A. ALFONSO, M. B. M.C. JUMANGIT, A. V. DURAN, E. L. LAGUERTA-HAY and A. E. GABATA , Harzburgite, Serpentinization, and the Garnierite Formation, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
99. May Thwe AYE, Myo Kyaw HLAING, Deline ZAW, Koichiro WATANABE and Kotaro YONEZU , Fluid Inclusion Study of Shwegyin Gold Deposit, Bago Region, Myanmar, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
100. Yudai HIRANO, Thomas D. TINDELL, Kotaro YONEZU, Koichiro WATANABE and SYAFRIZAL , Exploration Indicator Based on Hydrothermal Alteration and Gold Mineralization in Talang Santo Epithermal Low-Sulfidation Deposito, Southern Sumatra, Indonesia, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
101. Katsuhito TERASHIMA, Kotaro YONEZU, Thomas D. TINDELL, Adrian BOYCE, Mega F. ROSANA and Benny BENSAMAN , Mafic Signature at the Grasberg Porphyry Deposit, Indonesia: Contribution for the Cu-Au Mineralization, 7th Asia Africa Mineral Resources Conference 2017, 2017.11.
102. Syafrizal, Tomy Alvin Rivai, Kotaro Yonezu, Damar Kusumanto, Koichiro Watanabe, Arie Naftali Hawu Hede, Characteristics of a low-sulfidation epithermal deposit in the River Reef Zone and the Watuputih Hill, the Poboya gold prospect, Central Sulawesi, Indonesia
Host rocks and hydrothermal alteration, Minerals, 10.3390/min7070124, 7, 7, 2017.07.
103. Huan Li, Kotaro Yonezu, Koichiro Watanabe, Thomas Tindell, Fluid origin and migration of the Huangshaping W–Mo polymetallic deposit, South China
Geochemistry and 40Ar/39Ar geochronology of hydrothermal K-feldspars, Ore Geology Reviews, 10.1016/j.oregeorev.2017.02.005, 86, 117-129, 2017.06.
104. Aung Zaw Myint, Khin Zaw, Ye Myint Swe, Kotaro Yonezu, Yue Cai, Takayuki Manaka, Koichiro Watanabe, Geochemistry and geochronology of granites hosting the Mawchi SN-W deposit, Myanmar
Implications for tectonic setting and emplacement, Geological Society Memoir, 10.1144/M48.17, 385-400, 2017.01.
105. G. Haganje, KOTARO YONEZU, Aacharya Sabita, Koichiro Watanabe, Takushi Yokoyama, Preliminary Research on the Role of Surfactant on the Polymerization of Monosilicic Acid: Implication to the Prevention of Silica Scaling from Geothermal Water, International Symposium on Earth Science and Technology 2016, 576-579, 2016.12.
106. K. Terashima, KOTARO YONEZU, T. Tindell, Ety Suryani, M. Rosana, Mineralization Characteristics of the Lebong Tambang Gold Deposit, Southern Sumatra, Indonesia, International Symposium on Earth Science and Technology 2016, 430-434, 2016.12.
107. Nyein Nyein Sint, KOTARO YONEZU, T. Tindell, M. T. Aye, Koichiro Watanabe, Geology and Mineralization of Skarn Deposits in Bwet Taung Prospect, Kalaw Township, Shan State, Myanmar, International Symposium on Earth Science and Technology 2016, 274-278, 2016.12.
108. W. S. Ibrahim, Koichiro Watanabe, Kotaro Yonezu, Structural and litho-tectonic controls on Neoproterozoic base metal sulfide and gold mineralization in North Hamisana shear zone, South Eastern Desert, Egypt
The integrated field, structural, Landsat 7 ETM+ and ASTER data approach, Ore Geology Reviews, 10.1016/j.oregeorev.2016.05.012, 79, 62-77, 2016.12.
109. Tomy RIVAI, KOTARO YONEZU, Syafrizal, Damar Kusumanto, Koichiro Watanabe, Preliminary Assessment on the Hydrothermal Alteration at the River Reef Zone, the Pobaya Gold Prostpect, Central Sulawesi, Indonesia, 6th Asia Africa Mineral Resources Conference 2016, 2016.09.
110. Yoki KITAYAMA, KOTARO YONEZU, Jillian GABO, Alfonso O, Duran A., Espallardo A, Santos R., Preliminary Geochemical Study on the Nickel Laterite Deposit, South Dinagat Island, Philippines, 6th Asia Africa Mineral Resources Conference 2016, 2016.09.
111. KOTARO YONEZU, Y. KAWAMOTO, Thomas Tindell, H. Ohashi, Takushi YOKOYAMA, Evaluation of Uniformity and Dispersibility of Synthesized Geo-reference Material: Rare Earth Eliments Doped Silica Glass, 6th Asia Africa Mineral Resources Conference 2016, 2016.09.
112. Adi Maulana, Akira Imai, Theo Van Leeuwen, Koichiro Watanabe, Kotaro Yonezu, Takanori Nakano, Adrian Boyce, Laurence Page, Anders Schersten, Origin and geodynamic setting of Late Cenozoic granitoids in Sulawesi, Indonesia, Journal of Asian Earth Sciences, 10.1016/j.jseaes.2016.04.018, 124, 102-125, 2016.07.
113. Mamiko Yamashita Maeno, Hironori Ohashi, Kotaro Yonezu, Akane Miyazaki, Yoshihiro Okaue, Koichiro Watanabe, Tamao Ishida, Makoto Tokunaga, Takushi Yokoyama, Sorption behavior of the Pt(II) complex anion on manganese dioxide (δ-MnO2)
a model reaction to elucidate the mechanism by which Pt is concentrated into a marine ferromanganese crust, Mineralium Deposita, 10.1007/s00126-015-0599-7, 51, 2, 211-218, 2016.02.
114. Agung Harijoko, Ryusuke Uruma, Haryo Edi Wibowo, Lucas Doni Setijadji, Akira Imai, Kotaro Yonezu, Koichiro Watanabe, Geochronology and magmatic evolution of the Dieng Volcanic Complex, Central Java, Indonesia and their relationships to geothermal resources, Journal of Volcanology and Geothermal Research, 10.1016/j.jvolgeores.2015.12.010, 310, 209-224, 2016.01.
115. A. Kuroda, KOTARO YONEZU, M. F. Rosana, S. PRIHATMOKO, Koichiro Watanabe, Laurence Page, Geochronological and Mineralogical Studies on Adularia-Quartz Vein of Kerta Area, Banten
Regency, Indonesia, International Symposium on Earth Science and Technology 2015, 2015.12.
116. Tomy Alvin Rivai, KOTARO YONEZU, Syafrizal, Koichiro Watanabe, Preliminary Investigation on the Quartz Veins and Host Rocks at the River Reef Zone, the Poboya
Gold Deposit, Central Sulawesi, Indonesia, International Symposium on Earth Science and Technology 2015, 2015.12.
117. Takashi Hase, KOTARO YONEZU, TINDELL THOMAS　DAVID, Syafrizal, Koichiro Watanabe, The Characteristics and Paragenesis of the Tellurium-bearing Au-Ag Kencana Deposit,
Halmahera Island, Indonesia, International Symposium on Earth Science and Technology 2015, 2015.12.
118. TINDELL THOMAS　DAVID, Takashi Hase, Syafrizal, KOTARO YONEZU, Au-Ag-Te mineralisation of the Kencana epithermal Deposit, Halmahera Island, Indonesia, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
119. Waleed Ibrahim, KOTARO YONEZU, Koichiro Watanabe, Controls on pegmatite hosting U-Th ± REE mineralization at North Hamasana Shear Zone South Eastern Desert, Egypt, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
120. TINDELL THOMAS　DAVID, Takashi Hase, Syafrizal, KOTARO YONEZU, Cd- and Te- mineralisation characteristics of the Kencana low-sulfidation epithermal deposit, Halmahera, Indonesia, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
121. Syafrizal, Jarot Wiratama, KOTARO YONEZU, Tomy Alvin Rivai, Preliminary Study on Hill Reef 1 and Hill Reef 2 Vein at the Pobaya Prospect, Based on Textural, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
122. Rogel Santos, Ramon Santos, KOTARO YONEZU, J.A.S. Gabo, Kosei Noda, Omar Theogenes Alfonso, E. Laguerta, Abigail P. Espallardo, Emmanuelle Villaflor, Antonio V. Duran, The limonite-saprolite boundary as "bonanza horizon" for metals in nickeliferous laterite, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
123. KOTARO YONEZU, Kosei Noda, J.A.S. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Initial geochemical research on scandium as by-product with MacroAsia's Infanta Ni Laterite Area, Southern Palawan, Philippines, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
124. J.A.S. Gabo, Kosei Noda, KOTARO YONEZU, Rogel Santos, Ramon Santos, E. Laguerta, B. Payot, Koichiro Watanabe, Preliminary LA-ICPMS results of nickel laterite profiles from the Infanta Laterite deposit, Palawan, Philippines: Insights into the geochemical behavior of Sc and other REE in weathered nickel laterite, 5th Asia Africa Mineral Resources Conference 2015, 2015.07.
125. W. S. Ibrahim, Koichiro Watanabe, M. E. Ibrahim, Kotaro Yonezu, Neoproterozoic Tectonic Evolution of Gabal Abu Houdied Area, South Eastern Desert, Egypt
As a Part of Arabian–Nubian Shield Tectonics, Arabian Journal for Science and Engineering, 10.1007/s13369-014-1521-9, 40, 7, 1947-1966, 2015.07.
126. Agus Didit Haryanto, Mega Rosana, TINDELL THOMAS　DAVID, Jillian Gabo, Haris Yusuf, KOTARO YONEZU, Alteration, Ore Mineralogy, and Fluid Inclusion Microthermometry of the Rorah Kadal Quartz Vein in Cibaliung Goldfield, Western Java, Indonesia, ASEAN ENGINEERING JOURNAL PART C, 4, 2, 53-67, 2015.06.
127. Zhivko D. Budinov, Kotaro Yonezu, Thomas Tindell, Jillian Aira Gabo-Ratio, Stanoje Milutinovic, Adrian J. Boyce, Koichiro Watanabe, Copper-Gold Skarn Mineralization at the Karavansalija Ore Zone, Rogozna Mountain, Southwestern Serbia, Resource Geology, 10.1111/rge.12075, 65, 4, 328-344, 2015.01.
128. A. Kuroda, KOTARO YONEZU, M. F. Rosana, S. PRIHATMOKO, Koichiro Watanabe, Characteristics of the Ore Forming Fluid of the Low-Sulfidation Epithermal Gold-Silver Mineralization of Kerta Area, Banten Regency, Indonesia, Proceedings of the International Symposium on Earth Science and Technology 2014, 2014.12.
129. Kosei Noda, KOTARO YONEZU, J.A.S. Gabo, Koichiro Watanabe, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Geochemical Characteristic of Scandium Based on Coprecipitation Experiment in Nickel-Laterite Deposit, South Part of Palawan, Philippines: An Initial Study, Proceedings of the International Symposium on Earth Science and Technology 2014, 2014.12.
130. Aung Zaw MYINT, Ryota Suzaki, KOTARO YONEZU, Koichiro Watanabe, Kyaw ZAYA, Geology of Dawei Sn-W District, Myanmar, Proceedings of the International Symposium on Earth Science and Technology 2014, 2014.12.
131. TINDELL THOMAS　DAVID, Takashi Hase, Syafrizal, KOTARO YONEZU, Au-Ag-Te mineralisation of the Kencana epithermal Deposit, Halmahera Island, Indonesia, 4th Asia Africa Mineral Resources Conference 2014, 2014.10.
132. Zhivko BUDINOV, KOTARO YONEZU, Koichiro Watanabe, Characteristics of the Sulfide Mineralization from the Skarns at Central Rogozna Mountain, Serbia, 4th Asia Africa Mineral Resources Conference 2014, 2014.10.
133. W. S. Ibrahim, Koichiro Watanabe, M. E. Ibrahim, Kotaro Yonezu, Controls on quartzite bearing base-metal sulfide and invisible gold mineralization at Gabal Abu Houdied area, South Eastern Desert, Egypt, Arabian Journal of Geosciences, 10.1007/s12517-014-1563-z, 8, 7, 4983-4997, 2014.07.
134. Huan Li, Koichiro Watanabe, Kotaro Yonezu, Geochemistry of A-type granites in the Huangshaping polymetallic deposit (South Hunan, China)
Implications for granite evolution and associated mineralization, Journal of Asian Earth Sciences, 10.1016/j.jseaes.2014.03.004, 88, 149-167, 2014.07.
135. Huan Li, Koichiro Watanabe, Kotaro Yonezu, Zircon morphology, geochronology and trace element geochemistry of the granites from the Huangshaping polymetallic deposit, South China
Implications for the magmatic evolution and mineralization processes, Ore Geology Reviews, 10.1016/j.oregeorev.2013.12.009, 60, 14-35, 2014.07.
136. Adi Maulana, Kotaro Yonezu, Koichiro Watanabe, Geochemistry of rare earth elements (REE) in the weathered crusts from the granitic rocks in Sulawesi Island, Indonesia, Journal of Earth Science, 10.1007/s12583-014-0449-z, 25, 3, 460-472, 2014.06.
137. S. AACHARYA, KOTARO YONEZU, N. Gaowa, Yoshihiro Okaue, Koichiro Watanabe, Takushi Yokoyama, Formation of Iron(III) oxyhydroxy sulfate mineral and mobilization of arsenic during oxidative decomposition of a natural pyrite (FeS2), International Journal of Global Science Research, 2, 3, 145-151, 2014.04.
138. KOTARO YONEZU, Kosei Noda, J. Gabo, J. JUANERIO, E. LAGUERTA, Ramon Santos, Rogel Santos, Preliminary research on geochemical behavior of REE and PGE with laterite of MacroAsia's
Infanta Nickel Area, Palawan, Philippines
, Proceedings of the International conference on geological engineering, JICA RC, 2013.12.
139. T. Matsushita, KOTARO YONEZU, Yudzuru Inoue, Koichiro Watanabe, Takushi Yokoyama, Adsorption characteristics of Lithium adsorbent aimed at recovery of Lithium from geothermal fluid, Proceedings of 35th New Zealand Geothermal Workshop, 2013.11.
140. K. Noda, KOTARO YONEZU, L. SETIDJAJI, Koichiro Watanabe, Geochemical behavior of REE into laterite, Western Kalimantan, Indonesia, Proceedings of the 3rd Asia Africa Mineral Resources Conference 2013, 2013.09.
141. Jyunya Kanemitsu, KOTARO YONEZU, Koichiro Watanabe, Takushi Yokoyama, Preparation of LREE doped aluminosilicate glass by sol-gel method　for geochemical trace analysis, Proceedings of the 3rd Asia Africa Mineral Resources Conference 2013, 120-123, 2013.09.
142. Sakiko Ikeda, M. Rosana, KOTARO YONEZU, A. HARIANT, Koichiro Watanabe, Gold Mineralization Characteristics of Cikoneng vein of the Cibaliung Gold Deposit in Western Java, Indonesia, Proceedings of the 3rd Asia Africa Mineral Resources Conference 2013, 2013.09.
143. Gaowa Naren, Akane Miyazaki, Motoyuki Matsuo, Shuqin Bai, Kotaro Yonezu, Yoshihiro Okaue, Takushi Yokoyama, A study on the interaction between ferric ion and silicic acid in hydrosphere
Si-containing ferruginous deposits formed in neutral hot spring waters, Acta Geochimica, 10.1007/s11631-013-0603-9, 32, 1, 27-34, 2013.03.
144. Akane Miyazaki, Mayumi Numata, Mayumi Etou, Kotaro Yonezu, Ioan Balint, Takushi Yokoyama, Evidence for tetrahedral AlO4 formation induced by Zn2+ adsorption onto Al(OH)3 gel, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2012.11.041, 420, 115-121, 2013.03.
145. Akira Imai, Kotaro Yonezu, Kenzo Sanematsu, Takashi Ikuno, Shingo Ishida, Koichiro Watanabe, Visut Pisutha-Arnond, Somchai Nakapadungrat, Jarupong Boosayasak, Rare Earth Elements in Hydrothermally Altered Granitic Rocks in the Ranong and Takua Pa Tin-Field, Southern Thailand, Resource Geology, 10.1111/j.1751-3928.2012.00212.x, 63, 1, 84-98, 2013.01.
146. Chisato Masuda, KOTARO YONEZU, Koichiro Watanabe, Takushi Yokoyama, Recovery of Platinum from Spent Reforming Catalyst by Acid Leaching and Coprecipitation, International Symposium on Earth Science and Technology 2012, 2012.09.
147. Agus Didit Haryanto, M. Rosana, KOTARO YONEZU, Koichiro Watanabe, Petrology of Rorah Kadal Host Rock in Cibaliung West Java: The Effect of Hydrothermal Activity, Proceedings of the 2nd Asia Africa Mineral Resources Conference 2012, 2012.09.
148. Ryohei Takahashi, Koichiro Watanabe, Akira Imai, KOTARO YONEZU, Anders Schersten, Laurence Page, Timing of Ore Formation and Mineralization Characteristics of the Seisen Veins in the Hishikari Mine, Kagoshima, Japan, Proceedings of the 2nd Asia Africa Mineral Resources Conference 2012, 2012.09.
149. KOTARO YONEZU, Masahiro Nishida, Koichiro Watanabe, Takushi Yokoyama, Adsorption Interaction between REE and Clay Minerals: Implication to the Formation of Ion-Adsorption REE Ore, Proceedings of the 2nd Asia Africa Mineral Resources Conference 2012, 2012.09.
150. Christopher Vehe SAGAPOA, Akira IMAI, Takeyuki OGATA, Kotaro YONEZU and Koichiro WATANABE, Lateritization Process of Peridotites in Siruka, Choiseul, Solomon Islands, Journal of Southeast Asian Applied Geology, 3, 2, 76-92, 2012.03.
151. Adi MAULANA, Koichiro WATANABE, Akira IMAI and Kotaro YONEZU, Petrology and Geochemistry of Granitic Rocks in South Sulawesi, Indonesia: Implication for Origin of Magma and Geodynamic Setting, International Journal of Civil and Geological Engineering, 6, 1-6, 2012.01.
152. Takuma SUGA, S. NISHIMURA, Akira IMAI, Ryohei TAKAHASHI, Takahiro TANAKA Kotaro YONEZU, Y. OKAUE and Koichiro WATANABE, Ore-forming Condition of the Keisen No.3-1 Vein in the Hishikari Gold Deposit, Kagoshima, Japan, 1st Asia Africa Mineral Resources Conference 2011, 2011.12.
153. Tatsuya SHINKAWA, Kotaro YONEZU, Koichiro WATANABE and M. El-Ahmady IBRAHIM, Investigation of REE bearing Lateritic Layer in Sinai Peninsula and South Eastern Desert, Egypt, 1st Asia Africa Mineral Resources Conference 2011, 2011.12.
154. Jun MATSUDA, Koichiro WATANABE, Akira IMAI, I. W. Warmada, Kotaro YONEZU, S. SREYMEAN, I. INTHAVONGSA and Adrian J. BOYCE, Mineralization Environment of the Metamorphic Rock-hosted Au Prospect at Kebutuhjurang, Banjamegara Regency, Central Java, Indonesia, 1st Asia Africa Mineral Resources Conference 2011, 2011.12.
155. Tomohiro MATSUSHITA, Kotaro YONEZU, Hironori OHASHI, Takushi YOKOYAMA and Koichiro WATANABE, The Effect of Local Structure to the Adsorption Performance of Lithium Adsorbent, International Symposium on Earth Science and Technology 2011, 461-464, 2011.12.
156. Akihiro YAMASHITA, Kotaro YONEZU, Agung HARIJOKO and Koichiro WATANABE, Petrologic and Geochemical Investigation of Geothermal Manifestation Area around Tampomas Volcano, Weat Java, Indonesia, International Symposium on Earth Science and Technology 2011, 423-428, 2011.12.
157. Masahiro NISHIDA, Kotaro YONEZU, Koichiro WATANABE, Akira IMAI and Takushi YOKOYAMA, Adsorption Mode of REE on Clay Minerals and Their Desorption Behavior by Sequential Extraction, International Symposium on Earth Science and Technology 2011, 401-406, 2011.12.
158. Pornthip Parinayok, Mamiko Yamashita, Kotaro Yonezu, Hironori Ohashi, Koichiro Watanabe, Yoshihiro Okaue, Takushi Yokoyama, Interaction of Au(III) and Pt(IV) complex ions with Fe(II) ions as a scavenging and a reducing agent
A basic study on the recovery of Au and Pt by a chemical method, Journal of Colloid and Interface Science, 10.1016/j.jcis.2011.07.038, 364, 1, 272-275, 2011.12.
159. Kotaro YONEZU, Takushi YOKOYAMA, Yuki SHIMADA, Yoshihiro OKAUE and Koichiro WATANABE, Concentration Mechanism of Rare Earth Elements in the Siliceous Deposits formed from Geothermal Water, Kyushu, Japan, 5th International Workshop and Conference on Earth Resources Technology , 20-23, 2011.05.
160. S. A. IDRUS, S. PRAMUMIJOYO, I W. WARMADA, K. YONEZU and Akira IMAI, Characterisation and Leaching Behavior of Minerals by Sulphuric Acid in the Soroako Nickeliferous Laterite Ores, Sulawesi, Indonesia, International Symposium on Earth Science and Technology 2010, 421-425, 2010.12.
161. T. IKUNO, A. IMAI, K. YONEZU, K. SANEMATSU, L. D. SETIJADJI, K. SITHA, A. DIMARA, V. PISTHA‐ARNORD and S. NAKAPADUNGRAT, Concentration and Geochemical Behavior of REE in Hydrothermally-Altered and Weathered
Granitic Rocks in Southern Thailand and Bangka Island, Indonesia
, International Symposium on Earth Science and Technology 2010, 269-274, 2010.12.
162. M. NISHIDA, K. YONEZU, K. WATANABE, A. IMAI and T. YOKOYAMA, Effect of Electrolytes in Adsorption of REE on Kaolin Minerals, International Symposium on Earth Science and Technology 2010, 185-188, 2010.12.
163. Yuki Tohma, Akira Imai, Kenzo Sanematsu, Kotaro Yonezu, Ryohei Takahashi, Masaaki Koyama, Ryota Sekine, Robert Duncan, Koichiro Watanabe, Characteristics and mineralization age of the fukusen no. 1 vein, hishikari epithermal gold deposits, southern Kyushu, Japan, Resource Geology, 10.1111/j.1751-3928.2010.00140.x, 60, 4, 348-358, 2010.12.
164. Y. KAWABATA, K. YONEZU, K. WATANABE and T. YOKOYAMA, Silicic Acid Removal as Magnesium Silicate and Removal of Hazardous Elements from Synthetic Geothermal Water, 3rd Regional Conference on Geological Engineering Research in ASEAN, 162-165, 2010.11.
165. K. YONEZU, T. YOKOYAMA, Y. SHIMADA, Y. OKAUE and K. WATANABE, Uptake of Rare Earth Elements (REE) in the Silica Scales from Geothermal Water in Kyushu, Japan, 3rd Regional Conference on Geological Engineering Research in ASEAN, 54-60, 2010.11.
166. K. YONEZU, H. PIAO, T. YOKOYAMA, A. IMAI, K. WATANABE, Contributing to the Comprehensive Utilization of Geothermal Resources: Lithium Recovery at Geothermal Power Plant, 4th International Workshop and Conference on Earth Resources Technology , CD-ROM, 2010.05.
167. K. YONEZU, S. SAKOMOTO, K. Watanabe, A. IMAI, T. YOKOYAMA, REMOVAL OF SILICIC ACID AS CALCIUM SILICATE AND UPTAKE BEHAVIOR OF TRACE ELEMENTS, 4th International Symposium on Novel Carbon Resources Sciences, CD-ROM, 2009.12.
168. K. YONEZU, T. YOKOYAMA, A. IMAI, K. WATANABE, Contents of rare earth elements of quartz veins in the Hishikari epithermal gold deposit: Preliminary investigation by laser ablation ICP-MS, International Symposium on Earth Science and Technology 2009, 125-128, 2009.12.
169. P. PARINAYOK, K. YONEZU, H. PIAO, T. YOKOYAMA, K. WATANABE, Preliminary Study on Platinum Recovery from Spent Reforming Catalysts, International Symposium on Earth Science and Technology 2009, 363-368, 2009.12.
170. K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Characteristics of rare earth elements in quartz veins of the Hishikari epithermal gold deposit, Japan: Comparison between bulk and local analyses, 3rd International Workshop and Conference on Earth Resources Technology, 49-58, 2009.05.
171. K. YONEZU，T. SHIBAO, T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Interaction between gold(I) complexes and the surface of metal sulfides(FeS2 and Ag2S), 2nd International Workshop and Conference on Earth Resources Technology, 131-138, 2008.04.
172. K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Coprecipitation of Au(I) Complex Anions by Aluminum Hydroxide, 5th International Symposium on Earth Science and Technology, 309-316, 2007.12.
173. S. SAKOMOTO, K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Uptake of boron and gold by calcium silicate hydrate (CSH): Application for effective utilization of geothermal energy at geothermal power plant and the recovery of rare metals from geothermal water, 5th International Symposium on Earth Science and Technology, 287-292, 2007.12.
174. Kotaro Yonezu, Takushi Yokoyama, Yoshihiro Okaue, Akira Imai, Koichiro Watanabe, Concentration of gold(I) Thiosulfate complex ions on the surface of alumina gel and their change in chemical state
Preliminary experiment in the elucidation of the formation mechanism of epithermal gold deposits, Resource Geology, 10.1111/j.1751-3928.2007.00035.x, 57, 4, 400-408, 2007.12, In order to elucidate the formation mechanism of low-sulfidation epithermal gold deposit, the adsorption of [Au(S2 O3)2]3- (a model compound for gold(I) complex ion) on alumina gel (a model compound for the aluminum-bearing minerals) and change in chemical state of [Au(S2 O3)2]3- after adsorption on the surface of alumina gel were investigated as a basic model experiment. In the pH range from 4 to 6, the amount of [Au(S2 O3)2]3- adsorbed on alumina gel decreased with increasing pH and decreased drastically between pH 6 and 7, and then approached zero above pH 8 at 30°C. At 60°C, the amount of gold adsorbed above pH 7 was enhanced compared with that at 30°C. This adsorption tendency indicates that [Au(S2O3)2]3- is mainly adsorbed by electrostatic interaction between negative charges of [Au(S2O3)2]3- and positive charges of alumina gel because of its isoelectric point around pH 9. The chemical state of gold after adsorption of [Au(S2 O3)2]3- on alumina gel was examined using X-ray absorption near edge structure (XANES). The result showed that [Au(S2O3)2]3- was spontaneously reduced to elemental gold even in the absence of specific reducing agents after adsorption on alumina gel. This reduction reaction might occur by two steps: (i) disproportionation of the adsorbed [Au(S2O3)2]3- at the surface of alumina gel, and (ii) spontaneous reduction of the resulting gold(III) complex ions on the surface of alumina gel. The experimental results suggest that aluminum plays an important role in the concentration of gold(I) complex ions and subsequent reduction of gold during the formation of low-sulfidation epithermal gold deposits..
175. K. YONEZU，T. YOKOYAMA, Y. MOTOMURA, A. IMAI, K. WATANABE, Study on the Determination of Trace Elements in Siliceous Deposit Formed from Hydrothermal Water by ICP-MS, International Workshop on Earth Resources Technology, 77-80, 2007.04.
176. S. SAKOMOTO, K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Adsorption Behavior of Gold(I)-thiosulfate Comple Anions onto the Surface of Manganese Dioxide; Approach the Recovery of Gold from Geothermal Waters, International Workshop on Earth Resources Technology, 105-110, 2007.04.
177. KOTARO YONEZU, Coprecipitation of Au(III) complex anions with hydrous iron(III) oxide and their spontaneous reduction: Application to recovery of gold from the wastes of electronic products, 4th International conference on gold science, technology and its applications, 2006.12.
178. K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Relationship between the Ag/Au ratio in ore fluid and ore mineral in epithermal environment using Ag(I) and Au(I) adsorption experiment on alumina, 3rd International Symposium & Exhibition on Earth Resources and Geological Engineering Education, 388-395, 2006.08.
179. K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Formation Mechanism of Low-Sulfidation Epithermal Gold-Silver Deposits; Adsorption Behavior of Gold(I) and Silver(I)-Thiosulfate Complex Anions on the Surface of Alumina and Silica Gels, 3rd international Workshop on Earth Science and Technology, 417-424, 2005.12.
180. K. YONEZU，T. YOKOYAMA, Y. OKAUE, A. IMAI, K. WATANABE, Adsorption behavior of Au(I)-thiosulfate complex anions on the surface of alumina and silica gels: Approach to the formation mechanism of low-sulfidation epithermal gold deposits, 26th New Zealand Geothermal Workshop 2004, 36-39, 2004.12.
Presentations
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1. Manuel Nopeia, Akira Imai, Ryohei Takahashi, Kotaro Yonezu, Daúd Jamal, Andrea Agangi, Pearlyn Manalo, Thomas Tindell, Hinako Sato, Geology and Geochemistry of the Namicupo Gold Prospect, Mozambique Belt, Northeastern Mozambique: Insights from Ore Mineralogy, Fluid inclusions and Stable isotopes, SEG 2022: Minerals For Our Future, 2022.08.
2. Kotaro YONEZU, Solomon MIRACH, Sachihiro TAGUCHI, Hydrothermal Alteration of Noya Geothermal Field, Northeastern Kyushu, Japan, AOGS 2022, 2022.08.
3. D. A. B. Unganai, A. Imai, K. Yonezu, L. Ashwal, R. Takahashi, A. Agangi, P. Manalo, H. Sato, D. L. Jamal, Geochemistry of Fe-Ti oxides and related Ni-Cu-Fe sulfides from the Tete Gabbro-Anorthosite Suite, Mozambique: Evidence for magmatic
evolution and ore genesis, Goldschmidt 2022, 2022.07.
4. S. Juhri, K. Yonezu, A. Harijoko, T. Yokoyama, Investigation on the early-stage formation mechanism of silica scale under acidic pH, Goldschmidt 2022, 2022.07.
5. Karl D. Jabagat, Jillian Aira S. Gabo-Ratio, Omar B. Soberano, Eric S. Andal, Karlo L. Queaño, Kotaro Yonezu, Carla B Dimalanta, Graciano P. Yumul Jr., Yuan-Hsi Lee, Episodes of Barren to Fertile Porphyry Copper Deposit Magmatism on a Complex Island Arc System: Insights from the Igneous Host Rocks of the Suyoc Epithermal Prospect, Northern Luzon, Philippines, Goldschmidt 2022, 2022.07.
6. D. Makwela, A. Imai, ＠K. Yonezu, Paragenetic stage of rare earth elements mineralisation at the Kangankunde and Tundulu carbonatites of the Chilwa Alkaline Province, Malawi, 資源地質学会第71回年会, 2022.06.
7. D. A. B. Unganai, A. Imai, ＠L. Ashwal，R. Takahashi，D. L. Jamal，A. Agangi, P. Manalo, H. Sato, ＠K. Yonezu, LA-ICP-MS trace elemental analysis of Fe-Ti oxides of the Tete Suite（Mozambique）: Insights into its nature and ore-forming processes, 資源地質学会第71回年会, 2022.06.
8. M. Aruga, A. Imai, ＠K. Yonezu, Mechanism of gold-silver mineralization at the Yamada deposit, Hishikari mine: Geochemical modelling approach, 資源地質学会第71回年会, 2022.06.
9. M. Nopeia, A. Imai, R. Takahashi, ＠K. Yonezu, D. Jamal, A. Agangi, Re-Os dating of sulfides associated with gold mineralization in the Nanlia and Makorongo prospects, Mozambique Belt, northeastern Mozambique, 資源地質学会第71回年会, 2022.06.
10. R. G. Ngwanaotsile, A. Imai, K. Yonezu , Characterization of gold mineralization in the Kraaipan Greenstone Belt, southeastern Botswana, 資源地質学会第71回年会, 2022.06.
11. Onameditse Lulu Seaba, Akira Imai, Kotaro Yonezu, Thomas Tindell, Kemmonye Baliki, Characterisation of Archean greenstone belt hosted gold mineralisation at the Mupane gold mine, Botswana, 日本地球惑星科学連合2022年大会, 2022.05.
12. Gabriela Nogo Retnaningtyas Bunga Naen, Atsushi Toramaru, Saefudin Juhri, Kotaro Yonezu, Haryo Edi Wibowo, Four distinct pumice populations of the Youngest Toba Tuff (YTT):
Evidence for multiple magma chambers during the YTT 74 ka super eruption, 日本地球惑星科学連合2022年大会, 2022.05.
13. Manuel Augusto Manuel Nopeia, Akira Imai, Ryohei Takahashi, Kotaro Yonezu, Daúd Jamal, Andrea Agangi, Thomas Tindell, Pearlyn Manalo, Hinako Sato, Mineralogy, fluid inclusion and sulfur isotope characteristics of the Namicupo gold prospect, Mozambique Belt, northeastern Mozambique, 日本地球惑星科学連合2022年大会, 2022.05.
14. Karl Dimarucut Jabagat, Jillian Aira S. Gabo-Ratio, Omar B. Soberano, Karlo L. Queaño, Eric S. Andal, Kotaro Yonezu, Carla B. Dimalanta, Graciano P Yumul Jr., Yuan-Hsi Lee, Episodes of Barren to Fertile Porphyry Copper Deposit Magmatism on a Complex Island Arc System: Insights from the Igneous Host Rocks of the Suyoc Epithermal Prospect, Northern Luzon, Philippines, 日本地球惑星科学連合2022年大会, 2022.05.
15. John Emmanuel S. Fungo, Jillian Aira Gabo-Ratio, Kotaro Yonezu, Karl D. Jabagat, Marco Alfredo J. Barrientos, Kyoichi Ito, Listwanite-hosted epithermal gold mineralization in an island arc: Insights from the Malabeg prospect, Cabangan, Zambales, Philippines, 16th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, 2022.03.
16. Yuji Gonoi, Akira Imai, Kotaro Yonezu, Thomas Tindell, Adrian J. Boyce, Jun-ichiro Ishibashi, Application of Chlorite Geothermometry to the Hishikari Gold Mine, Japan: Implication for the Upflow Zone in the Low-Sulfidation Epithermal System, 16th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, 2022.03.
17. Kotaro Yonezu, Yushi Sekiya, Nobuhiro Mukae, Thomas Tindell, Jun-Ichiro Ishibashi, Formation Mechanism and Temperature of Subseafloor Sulfide Deposits at the Hakurei Site, Izena Hole, middle Okinawa Trough, GEOSEA 2021, 2021.12.
18. Saefudin JUHRI, Kotaro YONEZU, Agung HARIJOKO, Takushi YOKOYAMA, Elemental correlation of the early-stage precipitation of silica scale at Dieng geothermal power plant, Indonesia, GEOSEA 2021, 2021.12.
19. Shunnosuke Omachi, Kotaro Yonezu, Thomas Tindell, M. Rosana, Akira Imai, Sulfidation state of copper-gold mineralization of the Heavy Sulfide Zone, Grasberg Deposit, Papua, Indonesia, GEOSEA 2021, 2021.12.
20. Kotaro Yonezu, Saefudin Juhri, Kaito Arisato, Takushi Yokoyama, New development of quick silica scale monitoring method by linking geochemical data of geothermal fluid with precipitates at early stage of siliceous deposit, 13TH AUN/SEED-NET GEOLOGICAL & GEO-RESOURCES ENGINEERING CONFERENCE, 2021.12.
21. Saefudin Juhri, Yonezu, K., Yokoyama, T. Harijoko, A., Investigation on the formation mechanism of siliceous scales at early stage from
geothermal water: A case study at Dieng geothermal power plant, Indonesia, 日本地熱学会令和三年学術講演会, 2021.10.
22. Solomon Mirach，Kotaro Yonezu，Thomas Tindell，Akira Imai，Sachihiro Taguchi, Geochemical characterization and hydrothermal alteration of Noya geothermal field in northeastern Kyushu, Japan, 日本地熱学会令和三年学術講演会, 2021.10.
23. Samod, Y., Yonezu, K, Mapping of Land Surface Temperature Using Landsat 8 Satellite Data in Nord-Ghoubbet Geothermal Field, Djibouti, 日本地熱学会令和三年学術講演会, 2021.10.
24. Z. Zhou, K. Yonezu, A. Imai, T. Tindell and H. Li, The evolution of Sb mineralization and the source of metal and sulfur isotope in Southern China: Evidence from the trace elements and in-situ S isotope of sulfides
, 資源地質学会第70回年会, 2021.06.
25. Kotaro Yonezu, Saefudin Juhri, Kohei Tsuru, Kaito Arisato, Takushi Yokoyama, New approach on the evaluation of silica scale formation potential, ASIA WEEK 2020 KU Geothermal resource symposium in Taiwan, SE Asia and Kyushu, 2020.12.
26. Kentaro Abe, Kotaro Yonezu, Koichiro Watanabe, Sachihiro Taguchi and Sheng-Rong Song, Hydrothermal alteration on central Tatun volcano-hydrothermal area, northern Taiwan, ASIA WEEK 2020 KU Geothermal resource symposium in Taiwan, SE Asia and Kyushu, 2020.12.
27. Yuji Gonoi, Akira Imai、Kotaro Yonezu、Thomas Tindell、Koichiro Watanabe, Variations in mineral assemblages and oxygen and hydrogen isotopes of wall rock alteration in the Hishikari epithermal gold deposit, Japan , 日本地球惑星科学連合2020年大会, 2020.07.
28. ＃TOMY ALVIN RIVAI, Kenzo Sanematsu, Kotaro Yonezu, Syafrizal Syafrizal, DAIRI: THE ONLY AVAILABLE EXAMPLE OF GIANT SEDEX Zn-Pb-Ag DEPOSIT IN SUMATRA, INDONESIA, 日本地球惑星科学連合2020年大会, 2020.07.
29. ＠Kotaro YONEZU, Koichiro Watanabe, Takushi Yokoyama , Silica scale prevention and utilization of acidic geothermal fluid, NTU-KU Colloquium on Researches of Geothermal Energy, 2020.06.
30. ＠Kotaro YONEZU, Koichiro Watanabe, Takushi Yokoyama, “Case study: acidic fluid utilization”, Geothermal resource symposium in Taiwan and Kyushu :Research collaboration between NTU and KU, 2019.12.
31. Saefudin Juhri, ＠Kotaro YONEZU, Koichiro Watanabe, Takushi Yokoyama, “Case study: Dieng Geothermal Power Plant, Indonesia”, Geothermal resource symposium in Taiwan and Kyushu :Research collaboration between NTU and KU, 2019.12.
32. Juhri Saefudin, Kotaro Yonezu, Takushi Yokoyama, Harijoko Agung, Nurpratama Muhammad, Approaches on the removal of silica from acidified geothermal water, Dieng geothermal power plant, Indonesia, 日本地熱学会令和元年熊本大会, 2019.11.
33. Mohamed Abdillahi Aden, Kotaro Yonezu, Akira Imai, Thomas Tindell, Lithogeochemical approaches and effect of alteration: An application to the Asal-rift geothermal field, Djibouti, 日本地熱学会令和元年熊本大会, 2019.11.
34. Onchanok Juntarasakul，米津幸太郎，川本大祐，大橋弘範，小林 康浩，渡邊公一郎，横山拓史, Interaction of phosphate ion with ferric ion adsorbed to cation exchange resin, 第55回X線分析討論会, 2019.10.
35. S. Sirisokha, K. Yonezu, K. Watanabe, T. Tindell and T. Nakanishi , Lithogeochemistry, Alteration and Mineralization in the Halo Porphyry Copper-Molybdenum Prospect, Northeast Cambodia, 11TH AUN/SEED-NET GEOLOGICAL & GEO-RESOURCES ENGINEERING CONFERENCE, 2019.10.
36. Kotaro Yonezu, Shota Nakao, Thomas Tindell, Benny Bensaman, Mega Fatimah Rosana , Geochemical Characteristics of Ore-forming Fluid and Skarn Mineralization at the DMLZ Deposit, Ertsberg Mining District, Papua, Indonesia, 11TH AUN/SEED-NET GEOLOGICAL & GEO-RESOURCES ENGINEERING CONFERENCE, 2019.10.
37. Zhou Zenkai, Kotaro Yonezu, Geochemistry and Geochronology of the Banxi Sb Deposit: Implications for Fluid Origin and the Evolution of Sb Mineralization in Central-Western Hunan, South China, 11TH AUN/SEED-NET GEOLOGICAL & GEO-RESOURCES ENGINEERING CONFERENCE, 2019.10.
38. Naoto Kugizaki, K. Yonezu, A. Imai, Jillian Aira S. Gabo-Ratio, Eric S. Andal , Characteristics of Gold Mineralization and related Hydrothermal Alteration in SesameVein, Sangilo Mine, Baguio Mineral District, Philippines, 11TH AUN/SEED-NET GEOLOGICAL & GEO-RESOURCES ENGINEERING CONFERENCE, 2019.10.
39. Masunaga S, Tasaka Y, Yonezu K, Kiyota Y, Watanabe K & Yokoyama T, Chemical State of Dissolved Aluminum in Silicic Acid Solution and its Adsorption Behavior to Silica,, Goldschmidt 2019, 2019.08.
40. Jacob Kaavera, Akira Imai, Kotaro Yonezu, Thomas Tindell, Koichiro Watanabe, Kenzo Sanematsu, Platinum-group mineralization at the Tubane area, northern Molopo Farms Complex, southern Botswana, 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, 2019.08.
41. Yuji Gonoi, Akira Imai, Kotaro Yonezu, Thomas Tindell, Koichiro Watanabe , Subdivision of wall rock alteration zoning in the Hishikari epithermal gold deposit, southern Kyushu, Japan, 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, 2019.08.
42. Tomy Alvin Rivai, Kotaro Yonezu, Thomas Tindell, Akira Imai, Koichiro Watanabe, Syafrizal, Adrian J. Boyce, Genesis of the Dairi Zn-Pb-Ag Deposit, North Sumatra, Indonesia, 15th Biennial Meeting of the Society for Geology Applied to Mineral Deposits, 2019.08.
43. Bolor-Erdene Bilegsaikhan, Akira Imai, Jargalan Sereenen, Kotaro Yonezu. Thomas Tindell, The Geochemistry, Mineralization and Fluid Inclusion Study of Bayan-Uul Porphyry Cu-Au-Mo Deposit, Central Mongolia , AOGS 2019, 2019.07.
44. Mizuki Fujisaki, Sheng-Rong Song, Kotaro Yonezu, Koichiro Watanabe, Yi-Chia Lu, Yu-Jie Lin, Po-Tsun Li, Guo-Teng Hong, Wei-Chia Chu, Chi-Hsuan Chen, Chih-Hao Yang, Chi-Wen Yu, Ming-Chien Chung, Chyi Wang, Jiin-Fa Lee, Sachihiro Taguchi, Hitoshi Chiba , Hypogene Acid Hydrothermal Alteration at the Sih-Huang-Ping and Huang-Shan Steaming Grounds, Tatun Volcanic Group, Taiwan, AOGS 2019, 2019.07.
45. Kyaw Thu Htun, Kotaro Yonezu, Aung Zaw Myint, Akira Imai, Thomas Tindell, Koichiro Watanabe, Mineralogy and Fluid Inclusion Studies of Sn-W Deposit of the Tagu Area, Myeik, Southern Myanmar , AOGS 2019, 2019.07.
46. Kanehiko Kawasaki, Kotaro Yonezu, Reza Al Furqan, Benny Bensaman, Mega Fatimah Rosana, Initial Study of Copper-Gold Mineralization in MGI in the Grasberg Mine, Papua, Indonesia: Insight from Drill Core AM30-08H-05 , AOGS 2019, 2019.07.
47. Yushi Sekiya, Akira Imai, Tatsuo Nozaki, Junichiro Ishibashi, Kotaro Yonezu, Thomas Tindell , Preliminary Quartz and Sphalerite Fluid Inclusion Microthermometry, Hakurei Site, Izena Hole, AOGS 2019, 2019.07.
48. Kotaro Yonezu, Shota Nakao, Thomas Tindell, Benny Bensaman, Mega Fatimah Rosana, Transition of Hydrothermal System Related with Skarn Evolution at the DMLZ Cu-Au Deposit, Ertsberg District, Papua, Indonesia, AOGS 2019, 2019.07.
49. B.-E. Bilegsaikhan, K. Yonezu, A. Imai, T. Tindell, J. Sereenen and O. Sarantuya, The geochemistry, mineralization and fluid inclusion study of Bayan-Uul
porphyry Cu-Au-Mo deposit, Central Mongolia, 資源地質学会第69回年会, 2019.06.
50. J. Kaavera, A. Imai, K. Yonezu, T. Tindell and K. Watanabe, Chemical composition of chromite in the Molopo Farms Complex, Tubane
area Botswana: A preliminary study, 資源地質学会第69回年会, 2019.06.
51. T. A. Rivai, K. Yonezu, T. Tindell, A. Imai, K. Watanabe, Syafrizal, A.J. Boyce and K. Sanematsu, The Dairi Zn-Pb-Ag SEDEX deposit: A novel mineralization style in
Sumatra, Indonesia, 資源地質学会第69回年会, 2019.06.
52. Htet Sandar Aung, A. Imai, K. Yonezu and T. Tindell, The geochemistry, mineralization and alteration study of gold mineralization at EE3
prospect, Sagaing region, Northern Myanmar, 資源地質学会第69回年会, 2019.06.
53. Sai Pyae Sone, K. Yonezu, A. Imai, K. Watanabe and K. Sanematsu, Geology, mineralogy and fluid inclusion study of gold mineralization in Tagun-Khin-Dan
area in Slate Belt of Central Myanmar, 資源地質学会第69回年会, 2019.06.
54. H. Hassan, K. Yonezu, A., Imai, T. Tindell and K. Watanabe, Petrography and geochemistry of copper mineralization in the Mbesa prospect, southern Tanzania, 資源地質学会第69回年会, 2019.06.
55. Kotaro Yonezu, Katsuhito Terashima, Thomas Tindell, Benny Bensaman, M. Rosana, Preliminary Fluid Inclusion and Mineralogica. Study to Understand Mafic Magma Effect on Porphyry Cu-Au Mineralization at the Grasberg Deposit, Indonesia, Mining & Exploration Symposium in Botswana, 2019.02.
56. Juhri, S., Yonezu, K.，Yokoyama, T.，Nurpratama, M.I., Silica Scale Characterization and Deposition Behavior Study at Open Canal System of Wellpad X of
Dieng Geothermal Power Plant, Indonesia, 日本地熱学会平成30年東京大会, 2018.11.
57. Albano Mahecha1，Nurredin Saadi，Kotaro Yonezu，Koichiro Watanabe, Alteration mineralogy of Meru Volcano, Tanzania and implication to geothermal exploration, 日本地熱学会平成30年東京大会, 2018.11.
58. Mohamed Abdillahi ADEN，WATANABA Koichiro，Akirai IMAI，Kotaro YONEZU，TINDELL Thomas, SUB-SURFACE GEOLOGY AND HYDROTHERMAL ALTERATION OF THE WELLS GLC1,
ASAL 3, 4 and 5 IN ASAL-RIFT GEOTHERMAL FIELD, DJIBOUTI., 日本地熱学会平成30年東京大会, 2018.11.
59. T. Yamada, K. Yonezu, Jillian Aira S. Gabo-Ratio, R. A. Santos, Arnilo C. Milaor, The importance of Bedrock for concentration of Sc in the Nickel Laterite
Deposit of Central Dinagat Island, Philippines, International Association on the Genesis of Ore Deposits 2018, 2018.08.
60. Kotaro Yonezu, Katsuhito Terashima, Thomas Tindell, Benny Bensaman, M. Rosana, Mafic Magma Signature from Co-Ni-Cu Sulfide on Porphyry Cu-Au Mineralization at the Grasberg Deposit, Papua, Indonesia, International Association on the Genesis of Ore Deposits 2018, 2018.08.
61. N. Kugizaki, K. Yonezu, A. Imai, Jillian Aira S. Gabo-Ratio, Eric S. Andal, Geochemical Investigation on Epithermal Gold Mineralization of Sesame Vein, Sangilo
Mine, Baguio Mineral District, Philippines., International Association on the Genesis of Ore Deposits 2018, 2018.08.
62. Kotaro Yonezu, Katsuhito Terashima, Thomas Tindell, Benny Bensaman, M. Rosana, Preliminary Study on Mafic Magma Contribution to Porphyry Cu-Au Mineralization at the Grasberg Deposit, Indonesia: Evidence from Co-Ni-Cu Sulfide, AOGS 2018, 2018.06.
63. Tomiyuki Yamada, Kotaro Yonezu, Rogel Santos, Jillian Aira Gabo-Ratio, Arnilo Milaor Cagdianao, Geochemical Association of Concentration of REE Including Sc and Bedrock in Nickel Laterite Deposit, Central Dinagat Island, Philippines, AOGS 2018, 2018.06.
64. Naoto Kugizaki, Kotaro Yonezu, Jillian Aira Gabo-Ratio, Eric Andal, Preliminary Ore Mineralogical Study of Sesame Vein, Sangilo Mine, Baguio Mineral District, Northern Luzon, Philippines, AOGS 2018, 2018.06.
65. S. Sirisokha, K. Yonezu, K. Watanabe, T. Tindell and T. Nakanishi, Alteration, mineralization and fluid inclusion microthermometry of Oyadav South porphyry molybdenum-copper deposit, Ratanakiri, Cambodia, 資源地質学会第68回年会, 2018.06.
66. T. A. Rivai, Syafrizal, K. Yonezu, T. Tindell,A. J. Boyce, K. Sanematsu and Koichiro Watanabe, Zn-Pb±Ag mineralization in the basement of North Sumatra: a case study from Dairi, Indonesia, 資源地質学会第68回年会, 2018.06.
67. G. D. Faye, A. Yamaji, K.Yonezu, T. D. Tindell, A. Imai and K. Watanabe, Structural and thermal controls on the formation of the Hishikari Low Sulfidation Epithermal Deposit (Southern Kyushu, Japan), 資源地質学会第68回年会, 2018.06.
68. L.Permata, K. Yonezu, A. Imai and Syafrizal, Distribution of surface hydrothermal alteration in Rawa Gabus epithermal goldprospect, Lampung province, Indonesia, 資源地質学会第68回年会, 2018.06.
69. K.M. Khaing, ＠K. Yonezu, ＠T. Tindell, ＠K. Watanabe and ＠A. Imai, Geology, ore mineralogy of Wabo gold mineralization, Singu Township, Mandalayregion, Central Myanmar, 資源地質学会第68回年会, 2018.06.
70. K. T. Htun, K. Yonezu, A. Z. Myint, T. Tindell, A. Imai and K. Watanabe, Geochemistry, mineralogy and fluid inclusion studies of vein type Sn-W deposit in Tagu, Myeik District, Myanmar, 資源地質学会第68回年会, 2018.06.
71. N. A. Pacle, K. Yonezu, J. A. Gabo-Ratio, T. Tindell, J. B. Demegillo, Akira Imai, Host rock petrology of the different copper prospects in Samar and Leyte Islands, Philippines, 資源地質学会第68回年会, 2018.06.
72. Deris Hendriawan, Kotaro Yonezu, Mega Fatimah Rosana, Noor Cahyo Dwi Aryanto, Heavy Mineral Composition from Marine Sediment, Bangka, Indonesia, 日本地球惑星科学連合2018年大会, 2018.05.
73. F. Pratiwi・K. Yonezu・K. Watanabe・A. Haridjoko, Geochemistry of Surface Thermal Manifestation at Patuha Geothermal Field, West Java, Indonesia
, 日本地熱学会平成29年函館大会, 2017.10.
74. Edward Gichuki・Kotaro Yonezu・Koichiro Watanabe, Joint utilization of Gravity and Soil gas analysis to reveal concealed permeable zones in the Menengai Geothermal field, Kenya
, 日本地熱学会平成29年函館大会, 2017.10.
75. Y. Hirano、T. Tindell, K. Yonezu、k. Watanabe、Syafrizal, Hydrothermal Alteration and Gold Mineralization in Talang Santo Deposit, Lampung Province, Indonesia, Fermor Meeting 2017: Factory Earth, 2017.09.
76. K. Terashima, K. Yonezu, Thomas Tindell, M. Rosana, Benny Bensaman, Cu-Au Mineralisation at the Grasberg Porphyry Deposit: Evidence of Mafic Signatures from Sulphides, Fermor Meeting 2017: Factory Earth, 2017.09.
77. Oyungerel Sarantuya, Tetsuya Nakanishi, Kotaro Yonezu, Thomas Tindell, Adrian Boyce, Koichiro Watanabe, Jargalan Sereenen, Ore mineralogy and fluid inclusion and stable isotope study of the Olon Ovoot gold deposit, southern Mongolia, Annual Meeting of Society of Economic Geologists, 2017.09.
78. 米津 幸太郎, Keisuke IKEDA, Nyein Nyein Sint, M. T. Aye, Koichiro Watanabe, Relationship Between Gold Mineralization And Skarn Formation In Luntho Gold Deposit, Shwe Min Bon Area, Kalaw, Central Myanmar , AOGS 2017, 2017.08.
79. 寺島克仁, 米津 幸太郎, Thomas Tindell, M. Rosana, Benny Bensaman, Preliminary study on Pd-Ni-Co mineralogy in the Grasberg Deposit, Indonesia: Implications for mafic magma contribution to porphyry Cu-Au mineralization, AOGS 2017, 2017.08.
80. Yonezu K, Ohashi R, Watanabe K, Aacharya S & Yokoyama T, Removal Mechanism of Al-Bearing Polysilicic Acid from Geothermal Water by CTAB for the Prevention of Silica Scaling,, Goldschmidt 2017, 2017.08.
81. Gabo-Ratio J. A, Aguilera Pradenas M. A, Yonezu K, Tindell T & Andal E　, Geology and Mineralization of the Sangilo Epithermal Gold Deposit, Baguio Mineral District, Philippines, Goldschmidt 2017, 2017.08.
82. Inoue H, Yonezu K, Ueda A, Itoi R, Watanabe K & Yokoyama T , A New Viewpoint on the Polymerization of Silicic Acid in Geothermal Water
, Goldschmidt 2017, 2017.08.
83. Seang Sirisokha, Tetsuya Nakanishi, Kotaro Yonezu and Koichiro Watanabe, Initial Study on Alteration and Fluid Inclusion Microthermometry in Oyadav South, Ratanakiri, Cambodia, 10TH AUN/SEED-NET GEOLOGICAL ENGINEERING CONFERENCE, 2017.08.
84. Nyein Nyein SINT, Kotaro YONEZU, Thomas D. TINDELL and Koichiro WATANABE, Skarn mineralization and late hydrothemal alteration in the Tiger-mouth prospect, Shwe Min Bon skarn deposit, Kalaw Township, Southern Shan State, Myanmar, 資源地質学会第67回年会, 2017.06.
85. Guillaume D. FAYE, Kotaro YONEZU, Thomas D. TINDELL, Koichiro WATANABE and Atsushi YAMAJI, Differential stress evolution between early and late stage mineralization in the Yamada sub-deposit, Hishikari epithermal deposit southern Kyushu, Japan , 資源地質学会第67回年会, 2017.06.
86. Tomy Alvin RIVAI, Kotaro YONEZU, SYAFRIZAL, Kenzo SANEMATSU, D. Kusumanto and Koichiro WATANABE , Characteristics of a low-intermediate sulfidation epithermal gold deposit in the River Reef zone, Poboya prospect, Central Sulawesi, Indonesia, 資源地質学会第67回年会, 2017.06.
87. M. Batjargal, T. Nakanishi, O. Sarantuya, K. Yonezu, K. Watanabe and J. Sereenen, Gold mineralization characteristics of Zuun Sarinal deposit, Southgobi, Mongolia, , 資源地質学会第67回年会, 2017.06.
88. S. P. Sone K. Yonezu, K. Watanabe and K. Sanematsu, , Ore mineralization and wall-rock alteration associated with the Mong Yu gold deposit, Shan East, Myanmar, 資源地質学会第67回年会, 2017.06.
89. A. A. Pradenas, J. A. S. Gabo-Ratio, K. Yonezu, T. Tindell and E. S. Andal, , Quartz textures, alteration and gold mineralization of the Sangilo epithermal gold deposit, Baguio district, Philippines, 資源地質学会第67回年会, 2017.06.
90. M. K. Hlaing, K. Yonezu, M. T. Aye and K. Watanabe, Geology and geochemical characteristics of gold mineralization at Thae Phyu Chaung prospect, KyeikHto township, Mon State, Southern Myanmar, 資源地質学会第67回年会, 2017.06.
91. 米津 幸太郎, 黒田敦弘, M. Rosana, Sukmandaru Prihatmoko, 渡邊 公一郎, Ore Mineralogy And Formation Condition Of Epithermal Au-ag Mineralization In Kerta Area, West Java, Indonesia, AOGS 2016, 2016.08.
92. Tomy RIVAI, 米津 幸太郎, Syafrizal, 実松健造, Damar KUSUMANTO, 渡邊 公一郎, Ore Mineralogy Study On Au-bearing Minerals At The River Reef Zone, The Poboya Prospect, Central Sulawesi, Indonesia, AOGS 2016, 2016.08.
93. Kotaro Yonezu, Kosei Noda, J. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Value Adding Elements To Ni Laterite Deposit: A Initial Case Study Of Southern Palawan And Nonoc Islands, Philippines , AOGS 2016, 2016.08.
94. Yoki Kitayama, Kotaro Yonezu, J. Gabo, Alfonso O., Duran A., Espallardo A., Rogel Santos, Extraction of Ree Concentrated Zone Constrained By Redox Conditions In Nickel Laterite Deposit: Case Study Of South Dinagat Island, Philippines, AOGS 2016, 2016.08.
95. 寺島克仁, 米津 幸太郎, Thomas Tindell, Ety SURYANI, M. Rosana, Characteristics Of Gold Mineralization Of Lebong Tambang Low-sulfidation Epithermal Gold Deposit, Southern Sumatra, Indonesia , AOGS 2016, 2016.08.
96. 合田明紘, Aung Zaw Myint, 米津 幸太郎, Preliminary study of the copper mineralization in the Sabe Taung Area, Central Myanmar, IGC2016, 2016.08.
97. Thomas Tindell, 長谷昂, Syafrizal, 米津 幸太郎, Mineralization Features of the Kencana Au-Ag-Te Epithermal Deposit, Gosowong Goldfield, Halmahera, Indonesia, IGC2016, 2016.08.
98. 米津 幸太郎, 黒田敦弘, M. Rosana, Sukmandaru Prihatmoko, 渡邊 公一郎, Mineralogical and Geochronological Study of Epithermal Gold Mineralization in Kerta, West Java, Indonesia, IGC2016, 2016.08.
99. 米津 幸太郎, Rare Earth Elements (REE)in Weathered Granite & Laterite, 9TH AUN/SEED-NET GEOLOGICAL ENGINEERING CONFERENCE, 2016.07.
100. 米津 幸太郎, 川本悠人, 大橋弘範, 川本 大祐, 本間徹生, Takushi Yokoyama, Preparation of Synthetic Gd and Dy-Doped Silica Glass for Geochemical Reference Material: A Preliminary Characterization, Goldschmidt 2016, 2016.07.
101. Aung Zaw Myint, 米津 幸太郎, Koichiro Watanabe, Sn-W Mineralization in the Central Granitoid Belt of Myanmar, 資源地質学会第66回年会, 2016.06.
102. T. A. RIVAI, 米津 幸太郎, Syafrizal, Damar Kusumanto, Koichiro Watanabe, Characteristics of the mineral assemblages and chemical composition of siliceous deposit at the Watuputih Hill, the Poboya Gold Prospect, Central Sulawesi, Indonesia: Initial study on the indicative paleowater table, 資源地質学会第66回年会, 2016.06.
103. 米津　幸太郎, 野田耕正, 水上友輔, Jillian Gabo, E. Laguerta, R. A. Santos, R. Santos, Our experience on value adding elements related to Ni laterite in Palawan & Nonoc islands, 2016 Hunt for Ore Deposits: Emerging Trends, 2016.01.
104. 北山陽喜, 米津　幸太郎, Jillian Gabo, Koichiro Watanabe, R. Santos, Preliminary Geochemical Study on REE Concentration In Nickel Laterite Deposit, Dinagat, Philippines, 2016 Hunt for Ore Deposits: Emerging Trends, 2016.01.
105. 寺島克人, 米津　幸太郎, TINDELL THOMAS　DAVID, Mega Rosana, Initial Study on Gold Mineralization of Lebong Tambang, Southern Sumatra, Indonesia, 2016 Hunt for Ore Deposits: Emerging Trends, 2016.01.
106. 黒田敦弘, 米津 幸太郎, M. Rosana, Sukmandaru Prihatmoko, 渡邊 公一郎, Characteristics of the Ore Forming Fluid of the Low-Sulfidation Epithermal Gold-Silver Mineralization of Kerta Area, Banten Regency, Indonesia
, AOGS 2015, 2015.08.
107. M. Rosana, 米津 幸太郎, Sakiko IKEDA, 渡邊 公一郎, Agus Didit Haryanto, Ore Mineralogy of Cikoneng and Cibitung Vein Cibaliung Gold Mine, Banten, Indonesia, AOGS 2015, 2015.08.
108. Kotaro Yonezu, Kosei Noda, J. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Preliminary geochemical research on the valuable by-product metals with laterite of MacroAsia's Infanta Ni area, Palawan, Philippines, GEOCON 2014, 2014.12.
109. Rogel Santos, 高橋亮平, Ramon Santos, Kotaro Yonezu, J. Gabo, Kosei Noda, M.B.M.C. Jumangit, Ultramafic rocks as carbon repositories:
Preliminary studies on carbon capture and sequestration experiment, GEOCON 2014, 2014.12.
110. Rogel Santos, Ramon Santos, M.B.M.C. Jumangit, J. Juanerio, E. Laguerta, Kotaro Yonezu, J. Gabo, Kosei Noda, A.P. Espallardo, A.P. Espallardo, Laterite geochemistry vs. pH-Eh values: Implications to nickeliferous laterite stratification, GEOCON 2014, 2014.12.
111. 野田耕正, 米津 幸太郎, J.A.S. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, An initial study on geochemical behavior of scandium associated with laterization in INFANTA nickel mine, Palawan, Philippine, IMA 2014, 2014.09.
112. 米津 幸太郎, 野田耕正, J.A.S. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Initial geochemical study on platinum associated with laterite of Macroasia's Infanta Nickel Area, Palawan, Philippines, IMA 2014, 2014.09.
113. TINDELL THOMAS　DAVID, 今井亮, 高橋亮平, 米津 幸太郎, A. J. Boyce, A. Schersten, 緒方武幸, 渡邊 公一郎, Investigation in mineralisation characteristics of the Kago low-sulfidation epithermal deposit, Nansastu District, Japan, IMA 2014, 2014.09.
114. 米津 幸太郎, 野田耕正, J.A.S. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Initial investigation on the concentration of REE and PGE with laterite of MacroAsia's infanta Ni area, Palawan, Philippines, 7TH AUN/SEED-NET GEOLOGICAL ENGINEERING CONFERENCE, 2014.09.
115. A.Z. Myint, 渡邊 公一郎, 米津 幸太郎, Mineralogy and Fluid Inclusion Study of the Mosakhee Tin-Tungsten Prospect: The First Stannite Occurrence of Myanmar
, 7TH AUN/SEED-NET GEOLOGICAL ENGINEERING CONFERENCE, 2014.09.
116. A.Z. Myint, 渡邊 公一郎, 米津 幸太郎, A Review of Tertiary Granitoids in Central Granitoid Belt, Myanmar: Implication for Tin Mineralization
, AOGS 2014, 2014.08.
117. A.Z. Myint, K Zaw, Y M Swe, 米津 幸太郎, 渡邊 公一郎, T. Manaka, Petrology, Geochemistry and Geochronology of Granites in Mawchi Sn-W Deposit, Myanmar: Implications for Petrogenesis and Tectonic Setting
, AOGS 2014, 2014.08.
118. 長谷 昂, 米津 幸太郎, 新川達也, I. Waleed, 渡邊 公一郎, I. Mohammed, REE Enriched Layer in Um Bogma Formation, Southwestern Sinai Peninsula, Egypt, AOGS 2014, 2014.08.
119. 黒田敦弘, 米津 幸太郎, M. Rosana, 渡邊 公一郎, Ore Mineralogy and Alteration Characteristics of the Low-sulfidation Epithermal Gold-silver Mineralization of Kerta Area, Banten Regency, Indonesia, AOGS 2014, 2014.08.
120. TINDELL THOMAS　DAVID, 今井亮, 高橋亮平, A. J. Boyce, A. Schersten, L. Page, 緒方武幸, 米津 幸太郎, 渡邊 公一郎, Investigation of the Au-Ag-Cu mineral systems of the Nansatsu District, Southern Japan, 資源地質学会第64回年会, 2014.06.
121. A.Z. Myint, 米津 幸太郎, 渡邊 公一郎, Significant REE and trace element pattern in cassiterite and wolframite
from Mawchi Sn-W polymetallic mineralization, Myanmar: insights
from EPMA and ICP-MS studies, 資源地質学会第64回年会, 2014.06.
122. Kotaro Yonezu, Syuhei Hara, Kosei Noda, J. Gabo, J. Juanerio, E. Laguerta, Ramon Santos, Rogel Santos, Preliminary study on PGE associated with laterite of MacroAsia's Infanta Nickel Area, Palawan, Philippines, GEOCON 2013, 2013.12.
123. Kotaro Yonezu, Masahiro Nishida, Koichiro Watanabe, Takushi Yokoyama, Adsorption Experiment of Rare Earth Elements on Clay Minerals: Implication to the Formation of Ion-Adsorption Type REE Deposit, 23rd V. M. Goldschmidt Conference, 2013.08.
124. KOTARO YONEZU, Koichiro Watanabe, Takushi Yokoyama, Experimental approach to the formation mechanism of epithermal gold deposit: Adsorption of gold(I) and (III) complexes on alumina, GOLD 2012, 6th International conference on gold science, technology and its applications, 2012.09.
125. KOTARO YONEZU, Tatsuya Shinkawa, Takuma Okito, Mohamed El-Ahmady IBRAHIM, Koichiro Watanabe, Rare Metals Resource Potential in South Eastern Desert, Egypt: REE bearing laterite in Wadi Natash and Nb and Ta in Abu Rusheid, Biennial meeting of Society of Economic Geologists 2012, 2012.09.
126. KOTARO YONEZU, Takuma Okito, Mohamed El-Ahmady IBRAHIM, Koichiro Watanabe, Niobium and Tantalum Mineral Resource Potential in Abu Rusheid, South Eastern Desert, Egypt, 34th International Geological Congress, 2012.08.
127. AKANE MIYAZAKI, MAYU NUMATA, MAYU ETOU, KOTARO YONEZU, Takushi Yokoyama, Adsorption and Sorption of Zn2+ on the Surface of Aluminum Hydroxide, Goldschmidt 2011, 2011.08.
128. A. SABITA, KOTARO YONEZU, Yoshihiro Okaue, Takushi Yokoyama, Arsenic in Siliceous Deposits Formed from Geothermal Water, Goldschmidt 2011, 2011.08.
129. KOTARO YONEZU, Yohei Kawabata, Koichiro Watanabe, Takushi Yokoyama, Silicic acid removal as calcium or magnesium silicate from geothermal water, Goldschmidt 2011, 2011.08.
Membership in Academic Society
  • The Geothermal Research Society of Japan
  • Asia Oceania Geosciences Society
  • Japan Geoscience Union
  • The mining and materials processing institute of Japan
  • Society of Resouce Geology
Educational
Educational Activities
Kikan Education Seminar
Field Geoscience Exercise
Earth System Exercise
Earth Resource Internship
Earth System Engineering Basic I and II
Resource Environmental Science
Resource Geology II
Resource Geology
Other Educational Activities
  • 2021.11.
  • 2022.01.
  • 2022.07.
  • 2021.01.
  • 2021.07.
  • 2020.07.
  • 2020.06.
  • 2019.10.
  • 2019.07.
  • 2019.07.
  • 2018.07.
  • 2018.07.
  • 2017.05.
  • 2017.07.
  • 2017.07.
  • 2016.07.
  • 2016.07.
  • 2015.07.
  • 2014.07.
  • 2013.07.
  • 2012.07.
  • 2011.07.
  • 2010.10.
Social
Professional and Outreach Activities
Lecturer in public seminar or for visiting engineer or government staff to teach earth resource engineering. Acceptance of foreign students or international collaborative research including industry..


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