南谷の層状含銅黄鉄鉱鉱床の下盤際・断層に沿い磁鉄鉱・磁硫鉄鉱石が産する。鎌ケ谷10坑・12坑,頌徳12坑,白岩谷上流の含銅黄鉄鉱鉱層は銅亜鉛石英脈に切られ,金木谷向600尺立入には層状含亜鉛磁硫鉄鉱鉱床が産出し,蝙蝠1坑・二本松坑旧坑では層状含銅磁鉄鉱鉱床が銅錫鉱脈に切られている。地質条件と鉱石の鉱物共生関係から,南谷・金木谷の場合には,黄鉄鉱質鉱石と斑糲岩貫入に由来する高温流動体との反応で形成され,蝙蝠・二本松の磁鉄鉱は菱鉄鉱と密接に共生し磁鉄鉱の形成は斑糲岩貫入の黄鉄鉱への作用ではない。含銅黄鉄鉱鉱石は熱水鉱液による著るしい変化を受けていない。蝙蝠1坑の交又部では磁鉄鉱鉱石と鉱液の反応により,斑銅鉱・銅藍が形成され,錫石・燐灰石を鉱染している。

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Naégi district, the southeastern margin of Gifu Prefecture, is one of the most famous localities for its pegmatite minerals. So-called Naégi mineralogical province includes many metallic ore deposits and pegmatites which distributions are zonally arranged.
Stannite and cassiterite are found in some Cu-Zn ore deposits belonged to the outermost zone of the district. Stannites occur mainly as unmixing minerals from chalcopyrite and sphalerite, but a little stannite are formed for reaction of cassiterite and chalcopyrite. In addition stannites are classified into four varieties by microscopic properties.

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The Kyoto basin, the Yamato basin and the Ikoma hilly land may be included in a trough running north to south, which is called as the Yamashiro-Yamato Trough after the provincial names of this district. The trough is defined by the Ikomagawa fault on the west, and the Kasuga-Obaku on the east, but northward by the Paleozoics on the north of the Kyoto basin, while southward by the Ryoke metamorphic rocks developed along the Median line. The Ikoma hilly land is a depressed block, cut off from the Ikoma metamorphosed granite running north to south, by the Ikomagawa fault, and partly covered by the Osaka series. It may be considered to have been sliced by the north south faults into many blocks which are dropped stepwise toward the central line from the two sides.
The Kyoto basin is the terminal of the Yamashiro-Yamato Trough which is delimited by the Nishiyama fault on the west and the Obaku on the east. The Hanaore fault runs northeast-ward and passes the western foot of Higashiyama. It is evident that more than half of southern depression of the Kyoto basin has occurred between the Nishiyama fault and the Higashiyama, but the remaining has occurred between the branching faults of the former and the Hanaore. The Yamashina basin may be a depression that occurred between the Obaku fault and the branch-ing fault of Higashiyama, running north to south through the eastern foot of Higashiyama.
The Ikoma and the Katsuragi are the horst ranges lying between Osaka Bay and the Yamashiro-Yamato Trough. The former presents steep cliffs to Osaka Bay, whereas the latter offers similar cliffs toward the Yamato Plain, Steep cliffts may be an indication of depression of great magnitude in Osaka Bay as well as in the Plain.
The Yamashiro Yamato Trough was produced by the pulling force of the Fossa Magna Disturbance during the Plio-Pleistocene times. Though the making of the Trough is on a small scale it may be applied to such a large Trough as Osaka Bay, Biwa Lake and Ise Bay which were built at the same time and of the same origin. The Fossa Magna Disturbance was brought about by the enormous force of the Pacific applied to the Fossa Magna in the Plio-Pleistocene times.

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