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Silver orebody has been found in the southeast part of the Mozumi mine. This silver orebody is located in the silicified zone on the top of the South No. 8 lead-zinc orebody, which is composed of normal Mokuji-type ore in the lower part.<BR>Silver minerals recognized under microscope are native silver, argentite, canheldite and small amount of pyrargyrite and silver-bearing tetrahedrite. Tin minerals as cassiterite and stannitea re notably associated with these silver minerals.<BR>By the detailed mapping of the -320 M sublevel, rocks exposed were divided into several geological units and they were checked with chemical analysis. It has turned out that the parts called "grey quartz" have high grade silver content.<BR>Further exploration is still on the way but total about 24, 000 tons of the silver ore reserve containing Ag: 178 g/t, Pb: 0.79% and Zn: 4.3% have been already estimated.<BR>Characters of mineralization of this silver ores are left for further study, but at least it can be said for the exploration that every top of any lead-zinc orebody should be checked for silver mineralization especially in case silicification is recognized.
資源地質学会の論文