@article{oai:ir.kagoshima-u.ac.jp:02000140,
 author = {礼満, ハフィーズ and Rehman, Hafiz U. and ⼭⽥, 玲菜 and Yamada, Rena and 有川, 博幸 and Arikawa, Hiroyuki},
 journal = {鹿児島大学理学部紀要, Reports of the Faculty of Science, Kagoshima University},
 month = {Dec},
 note = {This study presents preliminary results of the field, petrographic and geochemical analysis of gold- and silver-bearing quartz veins exposed at the Yuki Gold mine, Hita city, Oita prefecture, western Japan. A preliminary field survey conducted at the Yuki Gold mine showed the exposures of vertical to sub-vertical ore-bearing quartz veins that cut across the volcanic rocks in the area. From the vein, eight rock samples were collected and investigated for petrological and geochemical studies. Petrological observations showed that majority of the samples were leucocratic and mainly composed of quartz with rare melanocratic or dark-colored patches or layers, comprising the non-silica but metallic or ore minerals of very fine-grained size. Geochemical analysis, conducted on cut and polished slabs/chips from the collected samples showed > 99 weight % SiO2 from the leucocratic domains and around 80 weight % SiO2 from the darker domains. In addition, some samples, showed Au from 10 to 13 μg/g (10〜13 g/ton） and Ag contents ranging from 23〜58 μg/g (23 〜 58 g/ton). These results indicate higher prospects of gold and silver contents in the Yuki Gold mine, showing a potential source for economical ore deposit. Further and detailed studies in the area will help in estimating the potential reserves of precious metals in the study area.},
 pages = {1--8},
 title = {大分県日田市柚木金山の岩石試料の岩石学的及び地球科学的研究},
 volume = {56},
 year = {2023}
}