Filters: Tags: Johnston, W. D., Jr. Collection (X)
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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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
Photomicrograph showing zoned enclosures and vacuoles, Empire mine. Nevada County, California. 1931.
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Empire mine,
Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
Photographers,
Album caption: Mt. Lassen, Shasta Co, Calif. 1931. Index card: Mt. Lassen. Shasta County, California. 1931.
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
Vugs and comb quartz: Polished slab from vug, euhedral quartz crystals are coated with white ankerite. The vug is filled with a dark-green mixture of chlorite and mechanically ground quartz in a matrix of carbonates. Nevada County, California. 1931. Plate 15-B, U.S.Geological Survey Professional paper 194. 1940.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
Photographers,
Quartz,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Empire mine,
Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
Album caption: Lassen Naitonal Park, Shasta Co, Calif. 1931. Index card: Lassen National Park. Shasta County, California. 1931.
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
Album caption: Lassen Nal. Park, Shasta Co, Calif. Index card: Lassen National Park. Shasta County, California. 1931.
Photographs of ore: polished slab showing sheared quartz with carbonate, cement; North Star mine, No. 3 vein, 9,000-foot level. Nevada County, California. 1931. Plate 11-C, U.S.Geological Survey Professional paper 194. 1940.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Empire mine,
Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
Photographers,
Sheeted zone at intersection of two veins, North Star mine, No. 2 drift, 8,200-foot level: Underground photograph of sheeted veins. Nevada County, California. 1931. Plate 10- D, U.S.Geological Survey Professional paper 194. 1940.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Johnston, W. D., Jr. Collection,
Mills, Mines, Quarries,
Nevada County, California,
North Star Mine,
Photographers,
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