NASA: USA - Rio Tinto Borax Mine - 11.11.13
Posted by Ricardo Marcenaro | Posted in NASA: USA - Rio Tinto Borax Mine - 11.11.13 | Posted on 16:11
This photograph from an astronaut on
the International Space Station features the former U.S. Borax mine,
located to the northwest of Boron, California. Now owned by the Rio Tinto Group, it is the largest open-pit mine in California and is among the largest borate mines in the world.
Borates are chemical compounds that include the element boron (B) and
are important as providers of an essential plant micronutrient, for
metallurgical applications, and as components of specialized types of
glass, anticorrosive coatings, fire retardants, and detergents.
Borate minerals such as borax, kernite, and ulexite
are found in the deposits at the Rio Tinto mine. The geologic setting
is a structural, nonmarine basin—a permanent shallow lake—fed by thermal
springs rich in sodium and boron that existed approximately 16 million
years ago. The first mining claim in the area was filed in 1913
following the discovery of boron-bearing nodules during well drilling.
Much of the mine workings were underground until 1957, when U.S. Borax
changed to open-pit mining.
The open pit spreads across approximately 54 square kilometers (21
square miles). Concentric benches along the pit wall are accentuated by
shadows and mark successive levels of material extraction. Mine tailings
are visible as stacked terraces along the northern boundary of the
mine. Ore processing facilities occupy a relatively small percentage of
the area, and are located directly to the west of the open pit.
The Rio Tinto mine is one of Earth’s richest borate deposits.
Together with mines in Argentina, they produce almost 40 percent of the
world’s supply of industrial borate minerals.
Astronaut photograph ISS037-E-22990
was acquired on October 30, 2013, with a Nikon D3X digital camera using
a 1000 millimeter lens, and is provided by the ISS Crew Earth
Observations experiment and Image Science & Analysis Laboratory,
Johnson Space Center. The image was taken by the Expedition 37 crew. It has been cropped and enhanced to improve contrast, and lens artifacts have been removed. The International Space Station Program supports the laboratory as part of the ISS National Lab
to help astronauts take pictures of Earth that will be of the greatest
value to scientists and the public, and to make those images freely
available on the Internet. Additional images taken by astronauts and
cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by William L. Stefanov, Jacobs at NASA-JSC.
- Instrument:
- ISS - Digital Camera
NASA: USA - Rio Tinto Borax Mine - 11.11.13
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