Dolomite Deposits in Gifu Prefecture
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概要
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The dolomite deposits in Gifu Prefecture are found, from west to east, in Kasuga-mura and Tani-gumi, Kuze-mura of Ibi-gun, Miyama-cho of Yamagata-gun, and Mugi-mura of Mugi-gun, along with their outskirts. They are situated on an arc whose radius measures 50 to 60 km from Nagoya. City, its center. It should also be noted that pure limestone deposits like those known at Mino-Aaka-saka and Saraji are located inside the arc, almost parallel to the dolomite deposits. Many of these dolomite deposits are found in thick limestone beds as seen in Mt. Ibuki, Mt. Funafuse, Mt. Kita and so on, although some exceptions are found in smaller extensions and also in slate, chert and like, without being accompanied by limestone. The dolomite deposits are generally accompanied by the limestone beds of Parafusulina zones. Therefore, their geological age is Middle Permian.<BR>Staining test disclosed that crystals of the mineral are mostly 0.1 mm in size, a little larger than those found at Kuzuu, Tochigi Prefecture, although not a few are of the same size. Dolomite of Japan is somewhat different from that of foreign countries in that the interstices of crystals are filled up with calcite, and accordingly the dolomite is very compact. Some parts of the dolomite deposits in the Kasuga area, Gifu Prefecture, have undergone thermal metamorphism by the injection of later granite.<BR>Four mines are in operation now, each producing from about 2, 000 to 13, 000 tons per month Grade of the ore is 17 to 19% MgO and 0.5 to 1.5% SiO<SUB>2</SUB>.<BR>Attention should be paid to the fact that the dolomite from the Kasuga area contains the least amount of Fe<SUB>2</SUB>O<SUB>3</SUB> among Japanese dolomite ores 0.01% on an average. For this reason, it is great demand from glass industry. The mineral is mostly used as refractory material for steel works. Another recent use of the dolomite is agricultural dolomitic lime.
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