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Sphalerite traversed by minute veinlets of chalcopyrite and polybasite; some of the veinlets in sphalerite are continuous with areas of the same minerals replacing galena this feature does not show in the picture. The veinlets are in the main formed by replacement, though possibly in small part fracture fillings. Photomicrograph of polished surface of ore from hanging-wall branch of Belmont vein, 1,200-foot level, Tonopah-Belmont mine. Nye County, Nevada. 1915. Plate 8-A, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Irregular fine aggregates of carbonate, argentite, and chalcopyrite intergrown with ore minerals in larger grains; photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine. Nye County, Nevada. 1915. Plate 6-B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Partial replacement of galena by fine aggregate of a light-colored carbonate, argentite and some chalcopyrite; there has been a slight replacement of the quartz. Photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine, depth uncertain. Nye County, Nevada. 1915. Plate 9-A in U.S. Geological Survey. Professional paper 104. 1918.
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Transition from areas wholly galena into areas that are mainly galena with some carbonate (rough dark gray) and argentite and finally into areas that are mainly carbonate with some argentite, galena, chalcopyrite, and electrum, named in order of abundance; photomicrograph of polished surface of ore from 1,000-foot level, Favorite vein, Tonopah-Belmont mine. Nye County, Nevada. 1915. Plate 7-A, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.