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Crow Butte
Crow Butte is a uranium mining operation located southeast of the city of Crawford in Dawes County, Nebraska, United States. Cameco Corporation owns and operates Crow Butte through its wholly owned subsidiary, Crow Butte Resources, Inc. History Crow Butte was the first uranium mine developed in Nebraska. It was discovered in 1980 and begin production in April 1991. It is a roll-front uranium deposit, mined using in-situ recovery (ISR). Due to weakening of the uranium market, production ceased in 2018. The project is under care and maintenance pending an improvement in uranium prices. Description At Crow Butte, uranium ore is mined in place underground in well fields. Uranium is extracted from basal Chadron Formation sandstone aquifers below the surface by the in-situ recovery process. A solution of water, oxygen and sodium bicarbonate (baking soda) is injected into the orebody, which liberates the uranium from its sandstone host and allows recovery by production wells. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dawes County, Nebraska
Dawes County is a county in the U.S. state of Nebraska. As of the 2010 United States Census, the population was 9,182. Its county seat is Chadron. The county was formed in 1885; it was named for James W. Dawes, the Nebraska Governor at the time. In the Nebraska license-plate system, Dawes County is represented by the prefix 69 (it had the 69th-largest number of vehicles registered when the license-plate system was established in 1922). History Dawes County was a part of the unorganized area of northwestern Nebraska until February 19, 1877, when it became a part of Sioux County from which it was separated February 19, 1885 and was given its present name. Geography Dawes County lies on the north border of Nebraska. Its north boundary line abuts the south boundary line of the state of South Dakota. According to the US Census Bureau, the county has an area of , of which is land and (0.3%) is water. Since it lies in the western part of Nebraska, Dawes County residents observe M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chadron Formation
Chadron Formation is a rock formation in North Dakota, South Dakota, northwestern Nebraska, and eastern Wyoming. It is named after the town of Chadron, Nebraska. It was mapped out by Carl Vondra Carl may refer to: *Carl, Georgia, city in USA *Carl, West Virginia, an unincorporated community *Carl (name), includes info about the name, variations of the name, and a list of people with the name *Carl², a TV series * "Carl", an episode of tel ... in the 1950s. References Paleogene geology of North Dakota Paleogene geology of South Dakota Paleogene Colorado Paleogene geology of Nebraska Paleogene geology of Wyoming {{NorthDakota-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Nebraska
The geology of Nebraska is part of the broader geology of the Great Plains of the central United States. Nebraska's landscape is dominated by surface features, soil and aquifers in loosely compacted sediments, with areas of the state where thick layers of sedimentary rock outcrop. Nebraska's sediments and sedimentary rocks lie atop a basement of crystalline rock known only through drilling. Geologic history, bedrock geology and stratigraphy The land that is today Nebraska originated as a juvenile crust expansion of the continent Laurentia—today part of the North American Craton and the core of the North American continent—between 1.8 and 1.6 billion years ago (Ga). Tectonic models suggest that Laurentia was part of the supercontinent Columbia but returned to being an independent continent between 1.35 and 1.3 billion years ago after which it became joined first to Protorodinia and the supercontinent Rodinia by 1.07 Billion years ago (Ga). The Precambrian basement rocks of Ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uranium Mines In The United States
Uranium is a chemical element with the Symbol (chemistry), symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive decay, radioactive because all isotopes of uranium are unstable; the half-lives of its naturally occurring isotopes range between 159,200 years and 4.5 billion years. The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99% of uranium on Earth) and uranium-235 (which has 143 neutrons). Uranium has the highest atomic weight of the primordial nuclide, primordially occurring elements. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few Parts-per notation#Parts-per expressions, parts per million in soil, rock and water, and is commercially uranium mining, ext ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buildings And Structures In Dawes County, Nebraska
A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, land prices, ground conditions, specific uses, prestige, and aesthetic reasons. To better understand the term ''building'' compare the list of nonbuilding structures. Buildings serve several societal needs – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work. A building as a shelter represents a physical division of the human habitat (a place of comfort and safety) and the ''outside'' (a place that at times may be harsh and harmful). Ever since the first cave paintings, buildings have also become objects or canvasses of much artistic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oglala Sioux Tribe
The Oglala (pronounced , meaning "to scatter one's own" in Lakota language) are one of the seven subtribes of the Lakota people who, along with the Dakota, make up the Očhéthi Šakówiŋ (Seven Council Fires). A majority of the Oglala live on the Pine Ridge Indian Reservation in South Dakota, the eighth-largest Native American reservation in the United States. The Oglala are a federally recognized tribe whose official title is the Oglala Sioux Tribe (previously called the Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota). However, many Oglala reject the term "Sioux" due to the hypothesis (among other possible theories) that its origin may be a derogatory word meaning "snake" in the language of the Ojibwe, who were among the historical enemies of the Lakota. They are also known as Oglála Lakhóta Oyáte. History Oglala elders relate stories about the origin of the name "Oglala" and their emergence as a distinct group, probably sometime in the 18th century. C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Regulatory Commission
The Nuclear Regulatory Commission (NRC) is an independent agency of the United States government tasked with protecting public health and safety related to nuclear energy. Established by the Energy Reorganization Act of 1974, the NRC began operations on January 19, 1975, as one of two successor agencies to the United States Atomic Energy Commission. Its functions include overseeing reactor safety and security, administering reactor licensing and renewal, licensing radioactive materials, radionuclide safety, and managing the storage, security, recycling, and disposal of spent fuel. History Prior to 1975 the Atomic Energy Commission was in charge of matters regarding radionuclides. The AEC was dissolved, because it was perceived as unduly favoring the industry it was charged with regulating.John Byrne and Steven M. Hoffman (1996). ''Governing the Atom: The Politics of Risk'', Transaction Publishers, p. 163. The NRC was formed as an independent commission to oversee nuclear ene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral Resource Classification
There are several classification systems for the economic evaluation of mineral deposits worldwide. The most commonly used schemes base on the International Reporting Template, developed by the CRIRSCO - Committee for Mineral Reserves International Reporting Standards, like the Australian Joint Ore Reserves Committee - JORC Code 2012, the Pan-European Reserves & Resources Reporting Committee' – PERC Reporting Standard from 2021, the Canadian Institute of Mining, Metallurgy and Petroleum - CIM classification and the South African Code for the Reporting of Mineral Resources and Mineral Reserves (SAMREC). A more detailed description of the historical development concerning reporting about mineral deposits can be found on the PERC web site. Mineral resources A 'Mineral Resource' is a concentration or occurrence of material of intrinsic economic interest in or on the earth's crust in such form, quality and quantity that there are reasonable prospects for eventual economic extraction. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sodium Bicarbonate
Sodium bicarbonate (IUPAC name: sodium hydrogencarbonate), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3. It is a salt composed of a sodium cation ( Na+) and a bicarbonate anion ( HCO3−). Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). The natural mineral form is nahcolite. It is a component of the mineral natron and is found dissolved in many mineral springs. Nomenclature Because it has long been known and widely used, the salt has many different names such as baking soda, bread soda, cooking soda, and bicarbonate of soda and can often be found near baking powder in stores. The term ''baking soda'' is more common in the United States, while ''bicarbonate of soda'' is more common in Australia, United Kingdom and Ireland. and in many northern/central European countries it is called ''Na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Care And Maintenance
Care and maintenance is a term used in the mining industry to describe processes and conditions on a closed minesite where there is potential to recommence operations at a later date. During a care and maintenance phase, production is stopped but the site is managed to ensure it remains in a safe and stable condition. Causes The mine might be considered to be temporarily unviable, due to current economic conditions or unfavourable resource prices, which are expected to improve at a later date. Declining ore grades at some mines can also be a reason for care and maintenance announcements. In some cases controlling interest companies decide not to further funding for subsidiary operations. During closure While the mine is closed, a care and maintenance program will manage environmental risks associated with tailings dumps, hazardous materials and open and underground pits. Care of idle plant and machinery will also be included in the program. Public health and safety consideratio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crawford, Nebraska
Crawford is a city in Dawes County, in the northwestern part of the state of Nebraska, in the Great Plains region of the United States. The population was 997 at the 2010 census. It was incorporated in 1886 and was named for the late Captain Emmet Crawford, who had been stationed at nearby Fort Robinson. History The Fremont, Elkhorn and Missouri Valley Railroad reached Fort Robinson in 1886 on its way to Wyoming. Several miles east of the Fort, the railroad passed through a tree claim belonging to William Annin (also spelled "Annon"), who sold his claim for a new townsite. The "tent city" that sprang up around the railroad was named after Lt. Emmet Crawford, who had been formerly stationed at Fort Robinson but was killed in Mexico in January 1886. The town's original plat was filed on June 21, 1886 by the Western Townsite Company. E.A. Thompson and William D. Edger (editor of the original '' Crawford Clipper'') circulated a petition for Crawford to become a village, but upon gett ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
In-situ Leach
In-situ leaching (ISL), also called in-situ recovery (ISR) or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, ''in situ''. In situ leach works by artificially dissolving minerals occurring naturally in a solid state. For recovery of material occurring naturally in solution, see: Brine mining. The process initially involves the drilling of holes into the ore deposit. Explosive or pathways in the deposit for solution to penetrate. Leaching solution is pumped into the deposit where it makes contact with the ore. The solution bearing the dissolved ore content is then pumped to the surface and processed. This process allows the extraction of metals and salts from an ore body without the need for conventional mining involving drill-and-blast, open-cut or underground mining. Process In-situ leach mining involves pumping of a lixiviant into the ore body via a borehole, which circulates through the porous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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