On the Ore Deposit of the Hanawa Mine as Related to the Structural features

Abstract

The Hanawa mine is situated at the western part of the so-called Towada basin, where it forms the Sotoyama local basin.
As the results of the geological survey, gravimetric survey and drilling, the writers conclude that the period of the Sotoyama basin's completion was the Funakawa age.
The ore deposit of the Hanawa mine belongs to the Kuroko type, and is divided into three main ore deposits, namely, the Motoyama, the Aketooshi and the Onnataira. Among them, the Motoyamaa ore deposit is peculiar in its vertical distribution of the unit ore bodies.
The results of the latest exploration revealed that the structure of the Motoyama ore deposit showing a deep trough accompanied by the inverted strata was shaped at the Funakawa age. Such a structure might be due to the movement which created the Sotoyama local basin.