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Ore deposits of the Ôe mine are of epithermal fissure-filling vein type, ore of which consists mainly of rhodochrocite, sphalerite, galena, chalcopyrite and pyrite with small amount of native gold and silver minerals. On the basis of the alteration mineral assemblages, the alteration halo of the mineralization may be divided into the following four types inwardly from the halo rim. (I) Albite-chlorite-(sericite)-(calcite) (II) Chlorite-(sericite)-(quartz) (III) Sericite-(quartz)-(chlorite)-(kaolin) (IV) Quartz-sericite-(kaolin) It is one of the most important problems for the mining geologist to delimit the exploration target by paying attention to the alteration halo. In this meaning, the alteration type (III) and (IV), which are closely associated with the metallic mineralization, are quite noticeable. The type (III) having relatively wide distribution in contrast to the type (IV) can be the exploration target. Rocks in the type (III) are easily distinguished from others by their brittleness which is correlated with the RQD (Rock Quality Designation) value. RQD data on logging the drill core are thus found to be very useful to delimit the exploration target in this mining area.
資源地質学会の論文