抄録
In order to know In-concentration in skarn-type deposits, which have not been well studied relative to vein and massive sulfide types, sphalerite-rich tin skarn ores from the Hoei mine were analyzed. The In-contents vary from 1 to 496 ppm. In assuming that the indium is all substituted in sphalerite, Insp is calculated, which varies from 851 to 2198 and averaged as 1715 (n=7). This value is the same order of magnitude as that of zinc concentrates of the famed Toyoha mine (Insp=1431). Although indium concentration has been observed from high temperature exit of the ore fluid in the Toyoha Pb-Zn deposits to an epithermal gold environment at Nishizawa, economically important concentration can be expected in a hightemperature hydrothermal stage, including even skarn-type mineralization.
