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. departmental bulletin paper
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handle: 10232/0002000607
Argulus coregoni Thorell, 1864 was collected from two species of fishes in small mountain streams in Akita Prefecture, northern Honshu, Japan. The infected fishes are ayu Plecoglossus altivelis altivelis (Temminck and Schlegel, 1846) (Plecoglossidae) from the Nukazawa River and stream-resident masu salmon Oncorhynchus masou masou (Brevoort, 1856) (Salmonidae) in the Bussha Stream. These collections are the second records of A. coregoni from ayu and river-resident masu salmon, respectively, in Akita Prefecture. Both the Nukazawa River and the Bussha Stream belong to the Yoneshiro River system and represent new collection localities for A. coregoni. The collected specimens of the species are briefly described and particularly characterized by the presence of four or five plumose setae on the posterior margin of the coxa in the first legs. This feature is useful to distinguish A. coregoni from a morphologically similar species, Argulus japonicus Thiele, 1900, which also occurs in Akita Prefecture and has only one plumose seta on the coxa of the first legs. journal article
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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. departmental bulletin paper
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