Nikon D3 PhotoPlus Expo 2007 B&H Show Report
The new full-frame D3 from Nikon was a must-see camera at the PhotoPlus Expo 2007 show. We speak with Lindsay Silverman, senior technical manager ...
Nearby Tucson mines as seen from space
Posted by Erin Jordan - email
TUCSON, AZ (KOLD) - Copper is a good conductor of electricity and heat, and it is a vital element of virtually all modern electronic devices.
Arizona is the United States' largest source of copper, primarily mined from a type of ore body known as porphyry copper deposits.
The most common approach to extracting metal-bearing ore from a porphyry copper deposit is by open-pit mining, although such mines also typically include some underground activities.
The astronaut photograph accompanying this story illustrates three open-pit mines located west-northwest of the town of Green Valley, just south of Tucson.
While the mines appear to be close to each other, each exploits a separate porphyry copper deposit.
A porphyry copper deposit forms when crystal-rich magma moves upwards through pre-existing rock layers.
As the magma cools and crystallizes, it forms an igneous rock with large crystals embedded in a fine-grained matrix, known as porphyry.
Brand New Nikon D3 12.1MP DSLR Camera +Nikon AF-S Nikkor 24-70mm f ...
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