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Chat (mining)
Chat is a local term in the Tri-State Mining District for gravel-like waste created by ore crushing in lead-zinc mining operations there in the late 1800s and mid-1900s. Chat is mainly composed of chert, dolomite, and sulfide minerals, but is contaminated with lead, zinc, cadmium, and other metals. The contamination of chat piles varies, lessening each time the pile is re-milled. Most of the heavy metals are present in fine particles in the chat, rather than the gravel-sized stones which are what it is mostly sold for. These fine particles can be blown by wind (20% of fine particles were subject to wind transport in one Oklahoma town studied). Once airborne, they can be inhaled by humans (6% were of appropriate size in that town) or deposited into soil or water. As of 2006, about 100 million tons of chat were present in the Oklahoma, Kansas, and Missouri tri-state mining region. A 2020 study of showed that Picher, a town surrounded by chat piles but not currently engaging in i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chat Pile Near Picher, Okla
Chat or chats may refer to: Communication * Conversation, particularly casual * Online chat, text message communication over the Internet in real-time * Synchronous conferencing, a formal term for online chat * SMS chat, a form of text messaging * A popular term for internet relay chat * Chat room or group chat * Video chat * Text messaging, person-to-person chat, i.e. non group chat * Instant messaging Entertainment * ''Chat'' (magazine), a British weekly women's magazine * CHAT-FM, a radio station (94.5 FM) licensed to Medicine Hat, Alberta, Canada * CHAT-TV, a television station (channel 6) licensed to Medicine Hat, Alberta, Canada * ''Le Chat'', a Belgian comic strip * Sophia "Chat" Sanduval, a Marvel Comics character * '' Chat Chat'', a 1995 album by Takako Minekawa * Chat show, a radio and television format Places * Chat, Iran, a village in Iran * Chat, Kyrgyzstan, a village in Kyrgyzstan * Chat, Turkmenistan, a Russian fort at the mouth of the Sumbar River in 1879 * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lead Belt
The Southeast Missouri Lead District, commonly called the Lead Belt, is a lead mining district in the southeastern part of Missouri. Counties in the Lead Belt include Saint Francois County, Missouri, Saint Francois, Crawford County, Missouri, Crawford, Dent County, Missouri, Dent, Iron County, Missouri, Iron, Madison County, Missouri, Madison, Reynolds County, Missouri, Reynolds, and Washington County, Missouri, Washington. This mining district is the most important and critical lead producer in the United States.http://pubs.usgs.gov/sir/2008/5140/pdf/Chapter1.pdf Seeger, Cheryl M., ''History of Mining in the Southeast Missouri Lead District and Description of Mine Processes, Regulatory Controls, Environmental Effects, and Mine Facilities in the Viburnum Trend Subdistrict'' in Kleeschulte, M.J., ed., 2008, Hydrologic investigations concerning lead mining issues in southeastern Missouri: U.S. Geological Survey Scientific Investigations Report 2008–5140, Chapter 1 History ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Broadcasting Service
The Public Broadcasting Service (PBS) is an American public broadcaster and non-commercial, free-to-air television network based in Arlington, Virginia Arlington County, or simply Arlington, is a County (United States), county in the U.S. state of Virginia. The county is located in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C., the nati .... PBS is a publicly funded nonprofit organization and the most prominent provider of educational television, educational programs to public television stations in the United States, distributing shows such as ''Nature (TV program), Nature'', ''Nova (American TV program), Nova'', ''Frontline (American TV program), Frontline'', ''PBS News Hour'', ''Masterpiece (TV series), Masterpiece'', ''Mister Rogers' Neighborhood'', ''Sesame Street'', ''Barney & Friends'', ''Arthur (TV series), ''Arthur'''' and ''American Experience''. Certain stations also provide spillover service to Canada. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Independent Lens
''Independent Lens'' is a weekly television series airing on PBS featuring documentary films made by independent filmmakers. Past seasons of ''Independent Lens'' were hosted by Angela Bassett, Don Cheadle, Susan Sarandon, Edie Falco, Terrence Howard, Maggie Gyllenhaal, America Ferrera, Mary-Louise Parker, and Stanley Tucci, who served two stints as host from 2012-2014. The series began in 1999 and for three years aired 10 episodes each fall season. In 2002, PBS announced that in 2003 the series would relaunch with ITVS as the production company, under the leadership of Sally Jo Fifer and Lois Vossen, and would expand to 29 primetime episodes a year. The 2019-20 season is regarded as the 18th season for the series. ''Independent Lens'' has won six Primetime Emmy Awards and 20 films have won News & Documentary Emmy Awards. In 2012, " Have You Heard From Johannesburg?" won for Exceptional Merit in Documentary Filmmaking; in 2007, '' A Lion in the House'' won for Excepti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Construction Aggregate
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction. Traditionally, it includes natural materials such as sand, gravel, crushed stone. As with other types of aggregates, it is a component of composite materials, particularly concrete and asphalt. Aggregates are the most mined materials in the world,Introduction (1): What are Aggregates? « Herefordshire & Worcestershire Earth Heritage TrustIntroduction (1): What are Aggregates? « Herefordshire & Worcestershire Earth Heritage Trust, accessdate: March 23, 2017Define Aggregate at Dictionary.comaggregate accessdate: March 23, 2017 being a significant part of 6 billion tons of concrete produced per year. Aggregate serves as reinforcement to add strength to the resulting material. Due to the relatively high hydraulic conductivity as compared to most soil types, aggregates are widely used in drainage applications such as foundation and French drain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traction (engineering)
Traction, traction force or tractive force is a force used to generate Motion (physics), motion between a body and a tangential surface, through the use of either dry friction or shear force. It has important applications in vehicles, as in ''tractive effort''. ''Traction'' can also refer to the ''maximum'' tractive force between a body and a surface, as limited by available friction; when this is the case, traction is often expressed as the ratio of the maximum tractive force to the normal force and is termed the ''coefficient of traction'' (similar to coefficient of friction). It is the force which makes an object move over the surface by overcoming all the resisting forces like friction, normal loads (load acting on the tiers in negative ''Z'' axis), air resistance, rolling resistance, etc. Definitions Traction can be defined as: In vehicle dynamics, tractive force is closely related to the terms tractive effort and drawbar pull, though all three terms have different definit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heavy Metals
upright=1.2, Crystals of lead.html" ;"title="osmium, a heavy metal nearly twice as dense as lead">osmium, a heavy metal nearly twice as dense as lead Heavy metals is a controversial and ambiguous term for metallic elements with relatively high density, densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary depending on the author and context and it has been argued that the term "heavy metal" should be avoided. A heavy metal may be defined on the basis of density, atomic number or chemical behaviour. More specific definitions have been published, none of which have been widely accepted. The definitions surveyed in this article encompass up to 96 out of the 118 known chemical elements; only mercury, lead and bismuth meet all of them. Despite this lack of agreement, the term (plural or singular) is widely used in science. A density of more than 5 g/cm3 is sometimes quoted as a commonly used criterion and is used in the b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tailings
In mining, tailings or tails are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are different from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed. Waste valorization is the evaluation of waste and residues from an economic process in order to determine their value in reuse or recycling, as what was gangue at the time of separation may increase with time or more sophisticated recovery processes. The extraction of minerals from ore can be done two ways: placer mining, which uses water and gravity to concentrate the valuable minerals, or hard rock mining, which pulverizes the rock containing the ore and then relies on chemical reactions to concentrate the sought-after material. In the latter, the extraction of minerals from ore requires comminution, i.e., grinding the ore into fine partic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tailing Ponds
In mining, tailings or tails are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are different from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed. Waste valorization is the evaluation of waste and residues from an economic process in order to determine their value in reuse or recycling, as what was gangue at the time of separation may increase with time or more sophisticated recovery processes. The extraction of minerals from ore can be done two ways: placer mining, which uses water and gravity to concentrate the valuable minerals, or hard rock mining, which pulverizes the rock containing the ore and then relies on chemical reactions to concentrate the sought-after material. In the latter, the extraction of minerals from ore requires comminution, i.e., grinding the ore into fine particles t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cadmium
Cadmium is a chemical element; it has chemical symbol, symbol Cd and atomic number 48. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12 element, group 12, zinc and mercury (element), mercury. Like zinc, it demonstrates oxidation state +2 in most of its compounds, and like mercury, it has a lower melting point than the transition metals in group 3 element, groups 3 through group 11 element, 11. Cadmium and its Congener (chemistry), congeners in group 12 are often not considered transition metals, in that they do not have partly filled ''d'' or ''f'' electron shells in the elemental or common oxidation states. The average concentration of cadmium in Earth's crust is between 0.1 and 0.5 parts per million (ppm). It was discovered in 1817 simultaneously by Friedrich Stromeyer, Stromeyer and Karl Samuel Leberecht Hermann, Hermann, both in Germany, as an impurity in zinc carbonate. Cadmium occurs as a minor component in most zinc ores and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Environmental Protection Agency
The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. The order establishing the EPA was ratified by committee hearings in the House and Senate. The agency is led by its administrator, who is appointed by the president and approved by the Senate. The current administrator is Lee Zeldin. The EPA is not a Cabinet department, but the administrator is normally given cabinet rank. The EPA has its headquarters in Washington, D.C. There are regional offices for each of the agency's ten regions, as well as 27 laboratories around the country. The agency conducts environmental assessment, research, and education. It has the responsibility of maintaining and enforcing national standards under a variety of environmental laws, in consultat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viburnum, Missouri
Viburnum is a city in Iron County, Missouri, United States. The population was 667 at the 2020 census. The city is located in the New Lead Belt. The Mayor of Viburnum is Johnny Setzer. History A post office called Viburnum was established in 1907, and remained in operation until 1955. The city was named for the genus ''Viburnum'', commonly known as the black haw and arrowwood. Geography Viburnum is four miles north of Bixby and 20 miles west of Belgrade. According to the United States Census Bureau, the city has a total area of , of which is land and is water. Demographics 2010 census As of the census of 2010, there were 693 people, 278 households, and 199 families living in the city. The population density was . There were 328 housing units at an average density of . The racial makeup of the city was 98.12% White, 0.43% Black or African American, 0.58% Native American, 0.14% from other races, and 0.72% from two or more races. Hispanic or Latino of any race were 1.15% ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
