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Soudan Iron Mine
The Lake Vermilion-Soudan Underground Mine State Park is a Minnesota state park at the site of the Soudan Underground Mine, on the south shore of Lake Vermilion, in the Vermilion Range (Minnesota). The mine is known as Minnesota's oldest, deepest, and richest iron mine, and now hosts the Soudan Underground Laboratory. As the Soudan Iron Mine, it has been designated a U.S. National Historic Landmark. History In the late 19th century, prospectors searching for gold in northern Minnesota discovered extremely rich veins of hematite at this site, often containing more than 65% iron. An open pit mine began operation in 1882, and moved to underground mining by 1900 for safety reasons. From 1901 until the end of active mining in 1962, the Soudan Mine was owned by the United States Steel Corporation's Oliver Iron Mining division. By 1912 the mine was at a depth of 1,250 feet (381 m). When the mine closed, level 27 was being developed at 2,341 feet (713.5 m) below the surface and the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Breitung Township, St
Breitung may refer to: * Edward Breitung, American politician * Breitung Township, Michigan * Breitung Township, Minnesota * Breitung Hotel See also * Breitungen, Thuringia, Germany * Breitungen, Saxony-Anhalt, Germany {{disambiguation, geo, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boundary Waters Canoe Area Wilderness
The Boundary Waters Canoe Area Wilderness (BWCAW or BWCA) is a wilderness area within the Superior National Forest in the northeastern part of the US state of Minnesota Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the 22nd most populous, with over 5.75 million residents. Minnesota is home to western prairies, now given over to ... under the administration of the United States Forest Service, U.S. Forest Service. A mixture of forests, glacial lakes, and streams, the BWCAW's preservation as a primitive wilderness began in the 1900s and culminated in the Boundary Waters Canoe Area Wilderness Act of 1978. It is a popular destination for canoeing, hiking, and fishing, and is one of the most visited wildernesses in the United States. Geography The BWCAW extends along of the U.S.–Canada border in the Arrowhead Region of Minnesota. The combined region of the BWCAW, Superior National Forest, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soudan 2
Soudan 2 was a particle detector located in the Soudan Mine in Northern Minnesota, United States, that operated from 1989 to 2001. It was a 960-ton iron tracking calorimeter whose primary purpose was to search for proton decay, although its data was also used to investigate the properties of neutrinos. It found no evidence of proton decay, but it did help confirm Super-Kamiokande's atmospheric neutrino result, supporting the theory of neutrino oscillation. The Soudan Mine is also home to the MINOS and CDMS detectors. History Soudan 2 was the successor to the Soudan 1, a similar 30 ton detector also intended to search for proton decay. The excavation for Soudan 2 was done in 1984–1985. Installation was started in 1986 and was completed in 1993. The experiment was run from April 1989 to June 2001, beginning with a partial detector of 275 tons.http://www.slac.stanford.edu/spires/find/experiments/www2?expt=SOUDAN "Results From The Soudan Prototype Proton Decay Experimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proton Decay
In particle physics, proton decay is a hypothetical form of particle decay in which the proton decays into lighter subatomic particles, such as a neutral pion and a positron. The proton decay hypothesis was first formulated by Andrei Sakharov in 1967. Despite significant experimental effort, proton decay has never been observed. If it does decay via a positron, the proton's half-life is constrained to be at least years. According to the Standard Model, the proton, a type of baryon, is stable because baryon number (quark number) is conserved (under normal circumstances; see chiral anomaly for an exception). Therefore, protons will not decay into other particles on their own, because they are the lightest (and therefore least energetic) baryon. Positron emission and electron capture – forms of radioactive decay which sees a proton become a neutron – are not proton decay, since the proton interacts with other particles within the atom. Some beyond-the-Standard Model gran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soudan 1
Soudan 1 was a particle detector located in the Soudan Mine in Northern Minnesota, United States, which operated for a year in 1981–82. It was a 30-ton tracking calorimeter whose primary purpose was to search for proton decay. It set a lower limit on the lifetime of the proton of 1.6×1030 years as well as upper limits on the density of magnetic monopoles. It also served as a prototype for the following Soudan 2 and MINOS experiments. Design and operation Soudan 1 was installed 590 meters below the surface and brought into routine operation in August 1981 by high-energy physics research groups from the University of Minnesota and Argonne National Laboratory. The detector was a 3×3×2m3 block of iron oxide-loaded concrete instrumented with 3456 gas proportional tubes. It was surrounded on five sides by a veto shield of solid scintillator, which was completed in October 1981. This allowed events which might otherwise have looked like proton decay, but were actually c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmic Rays
Cosmic rays are high-energy particles or clusters of particles (primarily represented by protons or atomic nuclei) that move through space at nearly the speed of light. They originate from the Sun, from outside of the Solar System in our own galaxy, and from distant galaxies. Upon impact with Earth's atmosphere, cosmic rays produce showers of secondary particles, some of which reach the surface, although the bulk is deflected off into space by the magnetosphere or the heliosphere. Cosmic rays were discovered by Victor Hess in 1912 in balloon experiments, for which he was awarded the 1936 Nobel Prize in Physics. Direct measurement of cosmic rays, especially at lower energies, has been possible since the launch of the first satellites in the late 1950s. Particle detectors similar to those used in nuclear and high-energy physics are used on satellites and space probes for research into cosmic rays. Data from the Fermi Space Telescope (2013) have been interpreted as evidence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Minnesota
The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public university, public Land-grant university, land-grant research university in the Minneapolis–Saint Paul, Twin Cities of Minneapolis and Saint Paul, Minnesota, United States. The Twin Cities campus comprises locations in Minneapolis and Falcon Heights, Minnesota, Falcon Heights, a suburb of St. Paul, approximately apart. The Twin Cities campus is the oldest and largest in the University of Minnesota system and has the List of United States university campuses by enrollment, ninth-largest main campus student body in the United States, with 52,376 students at the start of the 2021–22 academic year. It is the Flagship#Colleges and universities in the United States, flagship institution of the University of Minnesota System, and is organized into 19 colleges, schools, and other major academic units. The Minnesota Territorial Legislature drafted a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaspilite Banded Iron Formation, Soudan Underground State Park
Jaspillite, or ''jaspilite'' also ''itabirite'', is a chemical rock formed similar to chert, but is generally quite iron rich. It is also known as ''jasper taconite''. Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic and Archaean age in the Canadian shield. Jaspillite is also formed as exhalative chemical sediments in certain lead-zinc ore deposits, and as a hydrothermal alteration facies In geology, a facies ( , ; same pronunciation and spelling in the plural) is a body of rock with specified characteristics, which can be any observable attribute of rocks (such as their overall appearance, composition, or condition of formatio ... around submarine volcanism. It is used as a gemstone.Gemstones of North America - Volume 1, John Sinkankas - 1959 p.345 References Jaspillite and Taconite etymology [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MINOS Project In Soudan Mine
In Greek mythology, Minos (; grc-gre, Μίνως, ) was a King of Crete, son of Zeus and Europa. Every nine years, he made King Aegeus pick seven young boys and seven young girls to be sent to Daedalus's creation, the labyrinth, to be eaten by the Minotaur. After his death, Minos became a judge of the dead in the underworld. The Minoan civilization of Crete was named after him by the archaeologist Sir Arthur Evans. Etymology "Minos" is often interpreted as the Cretan word for "king", or, by a euhemerist interpretation, the name of a particular king that was subsequently used as a title. According to La Marle's reading of Linear A, which has been heavily criticised as arbitrary, we should read ''mwi-nu ro-ja'' (Minos the king) on a Linear A tablet. La Marle suggests that the name'' mwi-nu'' (Minos) is expected to mean 'ascetic' as Sanskrit ''muni'', and fits this explanation to the legend about Minos sometimes living in caves on Crete. The royal title ''ro-ja'' is read o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MinnPost
''MinnPost'' is a nonprofit online newspaper in Minneapolis, founded in 2007, with a focus on Minnesota news. Funding ''MinnPost'''s initial funding of $850,000 came from four families: John and Sage Cowles, Lee Lynch and Terry Saario, Joel and Laurie Kramer, and David and Vicki Cox. The Knight Foundation in Miami, Florida initially donated US$250,000 and in 2008 subsequently granted additional funds to expand local reporting. Major foundation support has come from the Blandin Foundation, Otto Bremer Foundation, Bush Foundation, Carolyn Foundation, Central Corridor Funders Collaborative, Ethics and Excellence in Journalism Foundation, John S. and James L. Knight Foundation, Martin and Brown Foundation, Joyce Foundation, The McKnight Foundation, The Minneapolis Foundation, Pohlad Family Foundation, and The Saint Paul Foundation. In March 2014, ''MinnPost'' announced that, thanks to a grant from the John S. and James L. Knight Foundation, ''MinnPost'' and online news site Voice o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Tribune
The ''Star Tribune'' is the largest newspaper in Minnesota. It originated as the ''Minneapolis Tribune'' in 1867 and the competing ''Minneapolis Daily Star'' in 1920. During the 1930s and 1940s, Minneapolis's competing newspapers were consolidated, with the ''Tribune'' published in the morning and the ''Star'' in the evening. They merged in 1982, creating the ''Star and Tribune'', and it was renamed to ''Star Tribune'' in 1987. After a tumultuous period in which the newspaper was sold and re-sold and filed for bankruptcy protection in 2009, it was purchased by local businessman Glen Taylor in 2014. The ''Star Tribune'' serves Minneapolis and is distributed throughout the Minneapolis–Saint Paul metropolitan area, the state of Minnesota and the Upper Midwest. It typically contains a mixture of national, international and local news, sports, business and lifestyle content. Journalists from the ''Star Tribune'' and its predecessor newspapers have won seven Pulitzer Prizes. Histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stuntz Bay Boathouse Historic District
The Stuntz Bay Boathouse Historic District comprises a row of 143 boathouses on Lake Vermilion in Breitung Township, Minnesota, United States. They were mostly built in the first half of the 20th century by employees of the adjacent Soudan Iron Mine. The mining company provided the lots to employees as a reward for their years of service, and the miners did their own construction. Most of the boathouses were built with tamarack logs and scrap corrugated metal from the mine property. Boating and fishing were major pastimes for the mine employees and their families in their leisure hours, and the mining company promoted access to outdoor recreation as a perk of employment. With The Stuntz Bay Boathouses were listed as a historic district on the National Register of Historic Places in 2007 for their local significance in the themes of architecture, entertainment/recreation, industry, and social history. They were nominated for illustrating the personal lives of the mine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
