In following the seismic discontinuity under the Japanese arcs, the distribution of the Quaternary sulfur deposits, the Pliocene-Miocene gold-silver deposits, and the Miocene Kuroko and vein-type deposits are re-examined. The sulfur deposits show remarkable concentration at the intersections between the discontinuity and the present volcanic front. The gold and silver deposits seem to follow transverse faults. The base metal deposits are definitely related to the volcanic front of that age, and they seem to have some connection with the discontinuity. This study may be applicable for the exploration of blind ore deposits.

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