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Photomicrograph showing zoned enclosures and vacuoles: euhedral quartz surrounded by fine-grained ankerite and chlorite. Empire mine, 7,000-foot level. Plain light. Nevada County, California. 1931. Plate 21-D, U.S.Geological Survey Professional paper 194. 1940.
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Topography in the vicinity of the upper ore bodies. Empire mine, Alder Creek district. Custer County, Idaho. 1912. Plate 6-B in U.S. Geological Survey. Professional paper 97. 1917.
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Strong Walls in granodiorite with interstitial breccia zone: Empire mine, 5,000-foot level. Nevada County, California. 1931. Plate 7-A, U.S.Geological Survey Professional paper 194. 1940.
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Feather quartz in crossing: Empire mine, 4,000-foot level, short drift on crosscut to X vein. Crossed nicols. Nevada County, California. 1931. Plate 23-B, U.S.Geological Survey Professional paper 194. 1940.
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Photomicrograph of brecciated quartz: cemented by ankerite, the black dots in the clear quartz are vacuoles., Newmont vein, 3,800-foot level: One nicol. Nevada County, California. 1931. Plate 20-A, U.S.Geological Survey Professional paper 194. 1940.
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Feather quartz in crossing: Empire mine, 3,000 foot-level, south drift. Crossed nicols. Nevada County, California. 1931. Plate 23-A, U.S.Geological Survey Professional paper 194. 1940.
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Photomicrograph of brecciated quartz: cemented by limonitic chalcedony (black), an earlier zone of shearing is marked by the fine-grained quartz. Empire mine, 1,300-foot level. Crossed nicols. Nevada County, California. 1931. Plate 20-C, U.S.Geological Survey Professional paper 194. 1940.


map background search result map search result map Strong Walls in granodiorite with interstitial breccia zone, Empire mine. Nevada County, California. 1931. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Photomicrograph of brecciated quartz,  Empire mine. Nevada County, California. 1931. Photomicrograph of brecciated quartz, Empire mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931. Empire Mine Underground 200 Level Empire, Tranquility, Silver Thread, and Contentment Mine 300 Level Empire Mine 200 Level Underground Map Empire Mine 300 Level Underground Map Empire Mine Extensive Underground and ABM Map with Geological Formation Empire Mine Topographic Map Tranquility Mine First Level Empire, Tranquility, and Silver Thread Mine Underground Workings Cross-Section Through Combination and Empire Anticlinals Empire Mine Underground Level Map Empire Mine Underground 200 Level Empire Mine Underground 200 Level Map Empire Mine Underground Level Map Strong Walls in granodiorite with interstitial breccia zone, Empire mine. Nevada County, California. 1931. Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931. Photomicrograph of brecciated quartz,  Empire mine. Nevada County, California. 1931. Photomicrograph of brecciated quartz, Empire mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931. Feather quartz in crossing, Empire mine. Nevada County, California. 1931.