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Cunningham Gulch, from the camp of the miners of the Mountaineer and North Star lodes, on the south side of the gulch, 1,000 feet above the valley. At the left is King Solomon Mountain, and on the right Green and Galena Mountains, with Rocky Gulch between, up which is the route of the Bakers Park and Del Norte wagon road. San Juan County, Colorado. 1875.
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Comb quartz and carbonates: polished section of vein composed of quartz and carbonates, North Star mine No. 2 vein, 8,600-foot level: Opposite saw-cut face of photo 81. Nevada County, California. 1931. Plate 18-A, U.S.Geological Survey Professional paper 194. 1940.
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Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein, 7,200-foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 9-F, U.S.Geological Survey Professional paper 194. 1940.
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Leo J. mine, formerly North Star mine, in Bradford Canyon, showing typical occurrence of a uranium-vanadium deposit in a prominent sandstone lens of the Salt Wash Member of the Morrison Formation. West water Canyon Member of the Morrison shown to left at top of photograph. San Juan County, Utah. ca. 1956. Figure 13 in U.S. Geological Survey. Bulletin 1190. 1965.
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Vein containing a single generation of homogeneous quartz, the inclusions rest on the footwall; scale is 6 inches long. North Star mine, North Star vein, 2,700 foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 8-A, U.S.Geological Survey Professional paper 194. 1940.
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Sheeted vein, North Star mine, No. 3 vein, 8,600-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10-B, U.S.Geological Survey Professional paper 194. 1940.
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Electrum (stippled) irregularly intergrown with sphalerite and quartz; the argentite shown in this photograph was probably formed by the replacement of (beta hypo gene) of galena all the other minerals, including the electrum, are believed to be alpha hypo gene; Photomicrograph of polished surface of ore from 1,050-foot level, Macdonald vein, North Star Mine. Nye County, Nevada. 1915.
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Comb quartz and carbonates: same section with carbonates dissolved by hydrochloric acid. The quartz shows comb structure and cavities, which existed prior to the introduction of the carbonates. North Star mine No. 2 vein, 8,600-foot level: Opposite saw-cut face of photo 82. Nevada County, California. 1931. Plate 18-A, U.S.Geological Survey Professional paper 194. 1940.
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Brecciated vein filling, North Star mine, A vein 4,000-foot level: Underground photograph of quartz veins. Nevada County, California. 1931. Plate 9-C, U.S.Geological Survey Professional paper 194. 1940.
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Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1 vein, 7,200-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10-A, U.S.Geological Survey Professional paper 194. 1940.
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Photomicrographs of sheared quartz: irregular granulation with development of mortar structure. North Star mine No. 2 vein, 8,200-foot level. Crossed nicols. Nevada County, California. 1931. Plate 19-C, U.S.Geological Survey Professional paper 194. 1940.
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Photographs of ore: Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1 vein, 8,200-foot level. Nevada County, California. 1931. Plate 11-A, U.S.Geological Survey Professional paper 194. 1940.
map background search result map search result map A mountain trail in Cunningham Gulch, leading from the camp to the mines of the Mountaineer, North Star, etc. San Juan County, Colorado. 1875. Cunningham Gulch, from the camp of the miners of the Mountaineer and North Star lodes. San Juan County, Colorado. 1875. Trail to the North Star mine up King Solomon Mountain, Cunningham Gulch. San Juan County, Colorado. 1875. Brecciated vein filling, North Star mine. Nevada County, California. 1931. Vein containing a single generation of homogeneous quartz. Nevada County, California. 1931. Sheeted vein, North Star mine, No. 3 vein. Nevada County, California. 1931. Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2. Nevada County, California. 1931. Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1. Nevada County, California. 1931. Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1. Nevada County, California. 1931. Photomicrographs of sheared quartz, North Star mine. Nevada County, California. 1931. North Star Mine, Long Section along Main Oreshoots North Star Mine, Geologic Assay Plan 2 Level North Star Mine, Cross Section A-A North Star Mine, Assay Plan North Star Mine, Geologic Assay Plan 3 Level Trail to the North Star mine up King Solomon Mountain, Cunningham Gulch. San Juan County, Colorado. 1875. A mountain trail in Cunningham Gulch, leading from the camp to the mines of the Mountaineer, North Star, etc. San Juan County, Colorado. 1875. Cunningham Gulch, from the camp of the miners of the Mountaineer and North Star lodes. San Juan County, Colorado. 1875. Brecciated vein filling, North Star mine. Nevada County, California. 1931. Vein containing a single generation of homogeneous quartz. Nevada County, California. 1931. Sheeted vein, North Star mine, No. 3 vein. Nevada County, California. 1931. Pinch in quartz vein from 24 to 6 inches, North Star mine, No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2 vein. Nevada County, California. 1931. Comb quartz and carbonates, North Star mine No. 2. Nevada County, California. 1931. Polished slab showing broken pyrite in vein quartz, North Star mine, No. 1. Nevada County, California. 1931. Polished slab of granodiorite showing sheeted zone of carbonate veinlets, North Star mine, No. 1. Nevada County, California. 1931. Photomicrographs of sheared quartz, North Star mine. Nevada County, California. 1931.