. Bulletin - United States National Museum. Science. 29 30 Figs. 29-30.—Tetrahedrite. Uypotheek mine, Shoshone County of the Wallace formation, the Yankee Boy mine on Big Creek, and the Polaris mine in Polaris Gulch being the most exploited deposits of this type. The tetrahedrite, which is the most prominent ore mineral, is usually massive, although small crystals have been noted in vugs in ore from the Yankee Boy mine. The gangue is either quartz or coarse buff manganiferous siderite and the veins also con- tain some pyrite, specular hematite, galena, and a little proustite or pyrargyrite. Th
. Bulletin - United States National Museum. Science. 29 30 Figs. 29-30.—Tetrahedrite. Uypotheek mine, Shoshone County of the Wallace formation, the Yankee Boy mine on Big Creek, and the Polaris mine in Polaris Gulch being the most exploited deposits of this type. The tetrahedrite, which is the most prominent ore mineral, is usually massive, although small crystals have been noted in vugs in ore from the Yankee Boy mine. The gangue is either quartz or coarse buff manganiferous siderite and the veins also con- tain some pyrite, specular hematite, galena, and a little proustite or pyrargyrite. The mineral from these veins is usually highly argen- tiferous and is mined as a silver ore. There are a number of veins of the same general type between Kellogg and Wallace. The tetra- hedrite from the Polaris mine is said to be arsenic and mercury bearing. Closed tube tests did not indicate the presence of either of these elements in tetrahedrite from the Yankee Boy mine. Tetrahedrite occurs also in many of the lead-silver ores, having been especially noted in the Standard-Mammoth, Hercules, and Gold Hunter mines. There is reason to believe that the silver con- tent of the galena ores is more or less proportional to their tetrahe- drite content and the mineral probably occurs in microscopic grains in many ores in which it can not be recognized with the eye. Speci- 51 J. B. Umpleby. U. S. Qeol. Survey, Bull. 528, p. Ill, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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