東北日本羽越山塊の小国・金丸ウラン鉱床

抄録

Several uranium deposits of sedimentary type have been found in the Neogene Tertiary sediments of Uetsu Massif in Northeast Japan. Most of them, except the Oguni-Kanamaru deposits around the border of Niigata and Yamagata Pref., have not been so fully explored as to offer any information about their geological significance.
There are two types of uranium deposits in the Oguni-Kanamaru area, those in conglomerate and in arkose. The latter type deposits are tabular in form and more extensive and uniform in grade than the former. It may be inferred from their mode of occurrence and the texture of ore that the tabular deposits in arkose belong to the “water table type”.