<Original Papers>Some Tellurium-Bearing Minerals from Suwa Mine, Ibaragi Prefecture

Suwa Mine is situated about 4 km south of Hitachi Mine which is one of the mines famous for the deposit of copper in Japan. The deposits of this mine which belong to the banded cupriferous pyrite deposit have developed, in general, concordantly with the major structures of mother rock composed of green schist. The ores in this mine consist mainly of pyrite with a small quantity of chalcopyrite. Veinlets and lenses of quartz often occur in the gangue rock and near both wants of the pyritic ore. Recently some tellurium-bearing minerals was found in quartz veinlets at 250 m level of No.1 Maiyama ore body. The ores at this level consist of quartz, epidote, chlorite, pyrite, chalcopyrite, tellurobismuthite, altaite and tellurium-bearing galena with a small quantity of petzite, sylvanite, sphalerite and galena. The order of succession of these minerals are as follows : (1) Gangue mineral (2) Sulphide mineral (3) Tellurium mineral (4) Native gold In this report above-mentioned tellurium minerals are studied by means of microscopic, spectrographic and X-ray examinations and of chemical analysis