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Part of north wall of great hydraulic mine at North Bloomfield. Except at the extreme right the mining operations ceased more than twenty years ago. The view illustrates the slowness with which vegetation reoccupies the surface, and also the sculpture of the gravel cliffs by atmospheric agencies. Nevada County, California. 1909.
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One of the largest hydraulic mines (1.6 km2) is located in California’s Sierra Nevada within the Humbug Creek watershed and Malakoff Diggins State Historic Park (MDSHP). MDSHP’s denuded and dissected landscape is composed of weathered Eocene auriferous sediments susceptible to chronic rill and gully erosion whereas block failures and debris flows occur in more cohesive terrain. This data release includes a 1992 digital surface model (DSM), 1992 orthophoto mosaic, masked orthophoto of the study area, 1992 ground cover classification, and 1992 pruned DSM with the vegetation bias removed. Stereo-photogrammetry was used to create a 1992 digital surface model (DSM) and orthophoto mosaic from archived 1992 aerial photographs....
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One of the largest hydraulic mines (1.6 km2) is located in California’s Sierra Nevada within the Humbug Creek watershed and Malakoff Diggins State Historic Park (MDSHP). MDSHP’s denuded and dissected landscape is composed of weathered Eocene auriferous sediments susceptible to chronic rill and gully erosion whereas block failures and debris flows occur in more cohesive terrain. This data release includes a 2014 digital elevation model (DEM), a study area boundary, and a geomorphic map. The 2014 DEM was derived from an available aerial LiDAR dataset collected in 2014 by the California Department of Conservation. The geomorphic map was derived for the study area from using a multi-scale spatial analysis. A topographic...
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Part of north wall of great hydraulic mine at North Bloomfield. Except at the extreme right the mining operations ceased more than twenty years ago. The view illustrates the slowness with which vegetation reoccupies the surface, and also the sculpture of the gravel cliffs by atmospheric agencies. Nevada County, California. 1909. Published as plate 10-B in U.S. Geological Survey Professional Paper 105. 1917.
    map background search result map search result map Part of north wall of great hydraulic mine at North Bloomfield. Nevada County, California. 1909. Part of north wall of great hydraulic mine at North Bloomfield. Nevada County, California. 1909. 1992 digital surface model and orthomosaic of Malakoff Diggins State Historic Park, California Geomorphic map of Malakoff Diggins State Historic Park, California Geomorphic map of Malakoff Diggins State Historic Park, California 1992 digital surface model and orthomosaic of Malakoff Diggins State Historic Park, California Part of north wall of great hydraulic mine at North Bloomfield. Nevada County, California. 1909. Part of north wall of great hydraulic mine at North Bloomfield. Nevada County, California. 1909.