File:Rossing mine and vicinity 2013.jpg
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DescriptionRossing mine and vicinity 2013.jpg |
English: The Erongo region is home to Rössing mine, the oldest and third-largest producer of uranium in the world. Situated about 70 kilometers (40 miles) northeast of the coastal city of Swakopmund, the mine is located near the ephemeral Khan River. The Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite acquired this image of the mine and surrounding landscape on March 8, 2013.
Roessing’s 400-meter (1,300-foot) deep pit and a large processing facility north of it are the dominant features in the bottom image. The pit taps into layers of metasedimentary rock that contain intrusions of a type of coarse-grained igneous rock called pegmatite. Pegmatite often contains rare minerals and forms when magma slowly cools and hardens beneath the surface. The mine sustains the small satellite town (population 7,600) of Arandis, which is visible near the top of the image. Roads and rail connect Arandis to Swakopmond, and there is a small airport south of Arandis. The dried channel of the Khan River is visible near the bottom of the image. While the surrounding landscape is largely devoid of vegetation, groundwater beneath the channel sustains some shrubs, trees, and grasses. The patches of green within and around the river channel in the top image are vegetation. Some Namibians and environmental groups have raised concerns that water samples from the Khan River channel showed elevated uranium levels. Uranium carried in wastewater from the mine may be reaching groundwater and increasing uranium levels near the river. However, a study led by Michael Schubert, a scientist from the Helmholtz Center for Environmental Research, found that uranium also occurs naturally in the channel sediments. His team found no evidence that water contaminated by the mine had seeped into the groundwater. |
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Date | acquired March 8, 2013 | ||||||
Source | http://earthobservatory.nasa.gov/IOTD/view.php?id=80714&eocn=related_to&eoci=related_image | ||||||
Author | NASA Earth Observatory image by Jesse Allen and Robert Simmon, using EO-1 ALI data | ||||||
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current | 03:32, 30 July 2014 | 720 × 720 (147 KB) | Tillman (talk | contribs) | {{Information |Description ={{en|1=The Erongo region is home to Rössing mine, the oldest and third-largest producer of uranium in the world. Situated about 70 kilometers (40 miles) northeast of the coastal city of Swakopmund, the mine is located ne... |
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Width | 5,671 px |
Height | 10,621 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 100 dpi |
Vertical resolution | 100 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS6 (Macintosh) |
File change date and time | 14:35, 22 March 2013 |
Color space | Uncalibrated |
Date and time of digitizing | 06:33, 11 March 2013 |
Date metadata was last modified | 10:35, 22 March 2013 |
Unique ID of original document | xmp.did:04801174072068118083ABB8915DDE67 |