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Album caption and index card: Gold mining in Borens Gluch. La Plata County, Colorado. 1875. Descriptive Catalog of the Photographs of the United States Geological Survey of the Territories, W. H. Jackson, Photographer, Second Edition, Illustrated, 1875 Series, page 78, No.272: Gold-mining in Boren's Gulch. Note: 02/07/2017 - verfied with NARA Still Picture Branch that this photograph's orientation is correct.
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Photomicrograph of polished sections of ore: supergene gold veinlets deposited in fractures in hessite. Surface etched with #1:1 HNO3; large area of white mineral unaffected by acid is coloradoite. Gangue is quartz; reflected light 157 x. Eagle Pass mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 12-D, in U.S.Geological Survey Professional paper 219. 1949.
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Album caption: Ignacio quadrangle, Colo. East slope valley of Vallecito River at about 8000 feet elevation, opposite Fish Hatchery, Looking west. Looking west across valley at the granite slopes of west Mountain:along east base runs great fault. Hermosa Carboniferous near Stream. Panoramic with 926. W. Cross, July 30, 1909. Ex. 1/4 sec. Stop 64, Light, bright (sun). Handwritten notes on album caption: La Plata Co. Inidex card: Panorama with 961. Note: Cross, C.W. photographs 45 through 1228 were transferred to National Archives and Records Administration on or about November 1, 1995. This duplicate album(s) is part of the permanent collection of the U.S. Geological Survey Library. Panorama with ccw00961.
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Album caption: Ignacio quadrangle, Colo. East slope valley of Vallecito River, at about 8000 feet opposite Fish Hatchery, looking north of west across valley. Beyond great fault is seen steeply upturned Ouray limestone, on granite. Panoramic with 926. W. Cross. July 30, 1909. Ex. 1/4 sec. Stop 64. Light, bright (Sun). Handwritten notes on album caption: La Plata Co. Index card: East slope of valley of Vallecito River. La P lata County, Colorado. 1909. Note: Cross, C.W. photographs 45 through 1228 were transferred to National Archives and Records Administration on or about November 1, 1995. This duplicate album(s) is part of the permanent collection of the U.S. Geological Survey Library.
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Album caption: Red Mesa quadrangle, Colorado. Camp at Red Mesa post office. Picture by R.W. Berry, topographer. 1911. Handwritten notes on album caption: La Plata County Index card: Geological Survey camp at Red Mesa. La Plata County, Colorado. 1911.
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Album caption and index card: View to the southeast looking across the Animas Canyon, near its mouth. Durango quadrangle. La Plata County, Colorado. October 30, 1897.
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Photomicrograph of polished sections of ore: subgraphic pattern of calaverite and sylvanite in hessite, Calaverite, sylvanite and hessite. These textures may indicate replacement of hessite by gold tellurides, but owing to its rarity, such replacement is not believed to be important in La Plata ores. Reflected light 250 x. Gold King mine. Photo by F.W. Galbraith. La Plata County, Colorado. Circa 1936. Plate 10-C, in U.S.Geological Survey Professional paper 219. 1949.
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Engine house, tipple and incline at the Perrine Peak Coal Mine, near Durango. La Plata County, Colorado. August 8, 1906.
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Album caption: Looking west across the La Plata from below Hesperus. To show terraces. La Plata quadrangle, La Plata County, Colorado. 1897. Note: Panorama with photograph number ccw00302. (Photo by Spencer). Handwritten note on album caption: See mounted photo in file.
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Typical exposure of Entrada sandstone on west side of Junction Creek, the thin Pony Express limestone member of the Wanakah formation caps the sandstone. This view also shows the character of the vegetation in much of the La Plata district; 2.5 miles below mouth of Castle Creek. La Plata County, Colorado. Circa 1936. Plate 3-A, in U.S.Geological Survey Professional Paper 219. 1949.
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Photomicrograph of polished sections of ore: hypogene chalcopyrite replaced by supergene bornite; Chalcopyrite, bornite; reflected light 175 x.
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View of western Cumberland basin, looking down Columbus basin, in the foreground a typical U-shaped glaciated valley, somewhat modified by talus accumulations. The Entrada sandstone forms Indian Trail Ridge in the background, Cumberland Basin is carved from unmetamorphosed red beds of the Cutler and Dolores formations, view from Columbus mine. La Plata County, Colorado. Circa 1936. Plate 5-C, in U.S.Geological Survey Professional paper 219. 1949.
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Textures of intrusive breccias, composed of various rock fragments in a matrix of fine- grained rock: From Miller tunnel of Incas Mine, black fragments are Pony express limestone of Wanakah formation; light fragments are porphyry. Colorado. Circa 1936. Plate 5-A, in U.S.Geological Survey Professional paper 219. 1949.
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View south from the Sierra La Plata. The La Plata Mountains are a group by themselves, some distance to the south of the San Juan Peaks, and are coming into general notice from the great mineral wealth contained within them. Out view is from a point on the west bank of the Rio La Plata, and some 3,000 feet above it. The stream can be seen in the dim distance, meandering away to the plain of the San Juan River. The horizon extends over into New Mexico. La Plata County, Colorado. 1874.
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Photomicrograph of polished sections of ore. Boxwork structure of magnetite; chalcopyrite has filed in boxwork and veinlet of pyrite cuts magnetite. La Plata County, Colorado. 1936.
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Album caption: Ignacio quadrangle, Colo. From east slope valley of Vallecito River. At about 8000 feet elevation, looking north of west across valley. To show upturned Ouray limestone on granite, west side great north-south fault of west side Vallecito. Grante Cliffs of West Mountain. Same view as center part of No. 926. W. Cross, July 30, 1909. Ex. 1/4 sec. Stop 64, Light, bright (Sun). 14-inch lens. Handwritten notes on album caption: La Plata Co. No index card. Note: Cross, C.W. photographs 45 through 1228 were transferred to National Archives and Records Administration on or about November 1, 1995. This duplicate album(s) is part of the permanent collection of the U.S. Geological Survey Library.
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Album caption: Just above "McCormick's Ranch" in the Animas Valley. The plateau is to the southeast. 2 p.m., exposure 1/25, F8. La Plata County, Colorado. October 20, 1901. Index card: Animas valley and plateaus to southwest. La Plata County, Colorado 1901.


map background search result map search result map Typical exposure of Entrada sandstone on west side of Junction Creek. La Plata County, Colorado. circa 1936. View south from the Sierra La Plata. The La Plata Mountains are a group by themselves, some distance to the south of the San Juan Peaks, and are coming into general notice from the great mineral wealth contained within them. La Plata County, Colorado. 1874. Boren's cabin, the home of the hermit-like miner, who, though living alone, differs from the hermit inbeing very glad to see visitors. La Plata Mountains. La Plata County, Colorado. 1875. Gold mining, Borens Gulch, La Plata County, Colorado. 1875. Head of Borens Gulch, La Plata Mountains. La Plata County, Colorado. 1875. Post office and U.S. Geological Survey camp at Red Mesa, La Plata County, Colorado. 1911. Looking across the Animas Canyon. La Plata County, Colorado. 1897. Animas Valley. La Plata County, Colorado. 1901. East slope of valley of Vallecito River. La Plata County, Colorado. 1909. East slope valley of Vallecito River. La Plata County, Colorado. 1909. From east slope of valley of Vallecito River. La Plata County, Colorado. 1909. Looking west across the La Plata from below Hesperus.  La Plata County, Colorado. 1897. Typical exposure of Entrada sandstone on west side of Junction Creek. La Plata County, Colorado. circa 1936. Head of Borens Gulch, La Plata Mountains. La Plata County, Colorado. 1875. Post office and U.S. Geological Survey camp at Red Mesa, La Plata County, Colorado. 1911. Looking across the Animas Canyon. La Plata County, Colorado. 1897. Animas Valley. La Plata County, Colorado. 1901. East slope of valley of Vallecito River. La Plata County, Colorado. 1909. East slope valley of Vallecito River. La Plata County, Colorado. 1909. From east slope of valley of Vallecito River. La Plata County, Colorado. 1909. Looking west across the La Plata from below Hesperus.  La Plata County, Colorado. 1897. View south from the Sierra La Plata. The La Plata Mountains are a group by themselves, some distance to the south of the San Juan Peaks, and are coming into general notice from the great mineral wealth contained within them. La Plata County, Colorado. 1874. Boren's cabin, the home of the hermit-like miner, who, though living alone, differs from the hermit inbeing very glad to see visitors. La Plata Mountains. La Plata County, Colorado. 1875. Gold mining, Borens Gulch, La Plata County, Colorado. 1875.