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collection:
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nasa new
collection
nasa new
collection
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mediatype:
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image
mediatype
image
mediatype
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collection:
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nasa
collection
nasa
collection
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collection:
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nasaimageofthedaygal lery
collection
nasaimageofthedaygal lery
collection
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title:
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Yuba Goldfields, California: Image of the Day
title
Yuba Goldfields, California: Image of the Day
title
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description:
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For hundreds of thousands of years, the Yuba River steadily washed sand and gravel out of the granite peaks of the Sierra Nevada and deposited it onto the flat floor of the Sacramento Valley. This gradual process changed abruptly when James Marshall discovered gold in the races of Sutter's Mill in 1848. Miners flooded the area, and the California Gold Rush -- and its controversial environmental legacy -- began. This image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard NASA's terra.nasa.gov/ Terra satellite shows the Yuba River Goldfields on August 29, 2001. The long gray shapes are hills of gravel interspersed with blue ponds. Bright green fields dominate the terrain on the west side of the image, while barren, non-irrigated land is to the east. The first Yuba-area miners panned for gold in stream beds in the valley, but within a decade large-scale industrial processes replaced solitary prospectors. Mining companies moved from the valley floor into the Sierra Nevada foothills, where miners blasted gravel hillsides with high-pressure jets of water -- a process called hydraulic mining. After the miners extracted gold in long wooden sluices, they dumped the gravel back into the mountain valleys. Rivers and streams carried the flood of sediment -- called slickens -- down to the Sacramento Valley. The volume of waste rock was incredible -- 685 million cubic feet of debris deposited in the Yuba River. The mine waste carried by the Yuba River ended up burying farms east of the town of Marysville, California. Lawsuits by farmers curtailed hydraulic mining in 1883, but the gravel remained behind in the Yuba Goldfields. In 1893, the California Debris Commission began to dredge the Yuba near Marysville to mitigate the environmental damage, and piled the gravel along the river's banks. In the twentieth century, a series of mining companies reprocessed the slickens, extracting gold that was increasing difficult to separate from the gravel. Even though the ore had already been processed, it was the principal source of gold in California for some time. By the 1970s, it was economically impossible to retrieve any more gold, and the debris became a source of aggregate, an essential ingredient of concrete. * www.newsreview.com/i ssues/sacto/2002-10- 24/cover.asp This Land Ain't Your Land (Sacramento News and Review) * www.ncgold.com/Histo ry/BecomingCA_Archiv e26.html Pressure Builds to End Hydraulic Gold Mining (Nevada County Gold)
description
For hundreds of thousands of years, the Yuba River steadily washed sand and gravel out of the granite peaks of the Sierra Nevada and deposited it onto the flat floor of the Sacramento Valley. This gradual process changed abruptly when James Marshall discovered gold in the races of Sutter's Mill in 1848. Miners flooded the area, and the California Gold Rush -- and its controversial environmental legacy -- began. This image from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard NASA's terra.nasa.gov/ Terra satellite shows the Yuba River Goldfields on August 29, 2001. The long gray shapes are hills of gravel interspersed with blue ponds. Bright green fields dominate the terrain on the west side of the image, while barren, non-irrigated land is to the east. The first Yuba-area miners panned for gold in stream beds in the valley, but within a decade large-scale industrial processes replaced solitary prospectors. Mining companies moved from the valley floor into the Sierra Nevada foothills, where miners blasted gravel hillsides with high-pressure jets of water -- a process called hydraulic mining. After the miners extracted gold in long wooden sluices, they dumped the gravel back into the mountain valleys. Rivers and streams carried the flood of sediment -- called slickens -- down to the Sacramento Valley. The volume of waste rock was incredible -- 685 million cubic feet of debris deposited in the Yuba River. The mine waste carried by the Yuba River ended up burying farms east of the town of Marysville, California. Lawsuits by farmers curtailed hydraulic mining in 1883, but the gravel remained behind in the Yuba Goldfields. In 1893, the California Debris Commission began to dredge the Yuba near Marysville to mitigate the environmental damage, and piled the gravel along the river's banks. In the twentieth century, a series of mining companies reprocessed the slickens, extracting gold that was increasing difficult to separate from the gravel. Even though the ore had already been processed, it was the principal source of gold in California for some time. By the 1970s, it was economically impossible to retrieve any more gold, and the debris became a source of aggregate, an essential ingredient of concrete. * www.newsreview.com/i ssues/sacto/2002-10- 24/cover.asp This Land Ain't Your Land (Sacramento News and Review) * www.ncgold.com/Histo ry/BecomingCA_Archiv e26.html Pressure Builds to End Hydraulic Gold Mining (Nevada County Gold)
description
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subject:
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Where -- California
subject
Where -- California
subject
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subject:
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What -- Terra
subject
What -- Terra
subject
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subject:
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What -- ASTER
subject
What -- ASTER
subject
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subject:
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Where -- Nevada
subject
Where -- Nevada
subject
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subject:
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What -- Advanced Spaceborne Thermal Emission and Reflection Radiometer
subject
What -- Advanced Spaceborne Thermal Emission and Reflection Radiometer
subject
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subject:
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Where -- The Valley
subject
Where -- The Valley
subject
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subject:
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Where -- Sacramento
subject
Where -- Sacramento
subject
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what:
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Terra
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what:
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ASTER
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what:
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Advanced Spaceborne Thermal Emission and Reflection Radiometer
what
Advanced Spaceborne Thermal Emission and Reflection Radiometer
what
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where:
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California
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where:
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Nevada
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where:
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The Valley
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where:
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Sacramento
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identifier:
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yuba_ast_2001241
identifier
yuba_ast_2001241
identifier
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uploader:
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gwilliam@archive.org
uploader
gwilliam@archive.org
uploader
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addeddate:
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2011-07-04 23:20:04
addeddate
2011-07-04 23:20:04
addeddate
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publicdate:
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2011-07-04 23:20:04
publicdate
2011-07-04 23:20:04
publicdate
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creator:
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NASA -- Image courtesy NASA/GSFC/METI/ERSDA C/JAROS, and U.S./Japan asterweb.jpl.nasa.go v/ ASTER Science Team
creator
NASA -- Image courtesy NASA/GSFC/METI/ERSDA C/JAROS, and U.S./Japan asterweb.jpl.nasa.go v/ ASTER Science Team
creator
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ImageUID:
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file:/home/lunaadmin /Source_download/201 107/1/yuba_ast_20012 41/yuba_ast_2001241_ lrg.jpg
ImageUID
file:/home/lunaadmin /Source_download/201 107/1/yuba_ast_20012 41/yuba_ast_2001241_ lrg.jpg
ImageUID
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filename:
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yuba_ast_2001241_lrg .jpg
filename
yuba_ast_2001241_lrg .jpg
filename
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date:
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2001-08-29
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rights:
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Public Domain
rights
Public Domain
rights
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source:
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year:
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2001
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language:
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eng
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