抄録
The ore deposits of the Noda-Tamagawa mine have become famous for their wealth of mineral species, the production of high grade manganese ores, and also the recent discovery of uranium ores. More than seventy minerals have been found in this mining area including such rare minerals as pyrochroite, manganosite, vredenburgite, yoshimuraite (a new mineral of Ba, Sr, Mn, Ti-silicate), etc.
The ore deposits of this mine may be classified into the following types:
(A) The contact-metamorphosed bedded manganese deposits in metamorphosed roof pendant in the batholithic mass of granitic rocks.
(B) (1) The uranium-bearing veins.
(2) The cobalt-nickel-molybdenum-bearing uranium deposits associated with pelitic hornfels.
(C) Pyrometasomatic copper-bearing pyrrhotite deposits found in limestone.
(D) Gold-silver-bearing quartz-arsenopyrite veins.
Among them manganese deposits are economically the most important ones. The geology and ore deposits of the mine are briefly described. The mineral parageneses of ores and country rocks are shown in Tables 1 and 2.
