There are many gypsum mines in Tohoku District, the gypsum mines which are now working amount to 24, particularly there are only in Tohoku District 13 mines.
They are as follows ;
Fukushima Prefecture 6 mines, Akita Prefecture 2 mines, Iwate Prefecture 2 mines
Miyagi Prefecture 2 mines, Yamagata Prefecture 2 mines
These gypsum mines concentrate in Fukushima Prefecture and Akita Prefecture. From the structural point view, these mines are mostly at upheaval places, and they are arranged as follows from the north.
1) Mt. Mase-Lake Towada Line, 2) Hachirogata-Kitakami Line, 3) Mt. Chokai-Turukawa Line, 4) Mt. Asahi-Shiraishi Line, 5) Iide-Bandai Line, 6) The district of Mt. Asahi
Besides in the North-South of the center part, there is an unheaval place, which, I named the South-North Center Line, particularly the mines mass in the point of intersection of the unheaval places of N. S. structure and N.W. structure ; as follows :
Hanawa Mine District in Mt. Mase-Lake Towada Line, Okoku sine District in Hachirogata-
Kitakame Line, Hosokura, Miyazaki mine District in Mt. Chokai-Furukawa Line, Fukuoka
Mine District in Asahi-Shiraishi Line, Aizu Valley North District in Iide-Bandai Line
There are similar structures in the case of Akita Prefecture and Fukushima Prefecture, that is, the mines lie in the part of wings of the unheaval places. Moreover the gypsum mines are only in the green tuff district, which rise and fall slightly.
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