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Covia
Unimin (known as Covia since 2018) Corporation is a wholly owned subsidiary of global industrial minerals company SCR- of Belgium. Unimin operates 44 mining and mineral processing facilities in the United States, Mexico and Canada. In Mexico, the company operates as Grupo Materias Primas de México and in Canada as Unimin Canada Ltd/Ltee. Executive offices are located in New Canaan, Connecticut with technology, analytical and sales service centers situated throughout North America. Unimin has over 2,400 employees located in 19 states in the U.S., Canada and Mexico. In 2018, Unimin merged with Santrol to become Covia. History Founded in 1970, Unimin is one of North America's largest producers of non-metallic industrial minerals. Unimin is the world's leading producer of quartz proppants (frac sand) and a major producer of resin coated sand proppants for oil and natural gas stimulation and recovery, and the largest producer of low-iron nepheline syenite for glass, ceramic, pain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Private Company
A privately held company (or simply a private company) is a company whose shares and related rights or obligations are not offered for public subscription or publicly negotiated in the respective listed markets, but rather the company's stock is offered, owned, traded, exchanged privately, or Over-the-counter (finance), over-the-counter. In the case of a closed corporation, there are a relatively small number of shareholders or company members. Related terms are closely-held corporation, unquoted company, and unlisted company. Though less visible than their public company, publicly traded counterparts, private companies have major importance in the world's economy. In 2008, the 441 list of largest private non-governmental companies by revenue, largest private companies in the United States accounted for ($1.8 trillion) in revenues and employed 6.2 million people, according to ''Forbes''. In 2005, using a substantially smaller pool size (22.7%) for comparison, the 339 companies on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Canaan, Connecticut
New Canaan () is a town in Fairfield County, Connecticut, United States. The population was 20,622 according to the 2020 census. About an hour from Manhattan by train, the town is considered part of Connecticut's Gold Coast. The town is bounded on the south by Darien, on west by Stamford, on the east by Wilton, on the southeast by Norwalk, and on the north by Lewisboro and Pound Ridge in Westchester County, New York. New Canaan is known for its architecture and public parks such as Waveny Park, and a town center with boutiques. Residents sing carols on God's Acre every Christmas Eve, a town tradition since 1916. Additionally, New Canaan is one of the wealthiest towns in the country, appearing in multiple rankings of the nation’s richest zip codes. It is also known for its public school system, which in 2018 was ranked as the top public school system in Connecticut, and in 2008 the third-best in the country. History In 1731, Connecticut's colonial legislature establish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Fracturing Proppants
A proppant is a solid material, typically sand, treated sand or man-made ceramic materials, designed to keep an induced hydraulic fracture open, during or following a fracturing treatment, most commonly for unconventional reservoirs. It is added to a ''fracking fluid'' which may vary in composition depending on the type of fracturing used, and can be gel, foam or slickwater–based. In addition, there may be unconventional fracking fluids. Fluids make tradeoffs in such material properties as viscosity, where more viscous fluids can carry more concentrated proppant; the energy or pressure demands to maintain a certain flux pump rate (flow velocity) that will conduct the proppant appropriately; pH, various rheological factors, among others. In addition, fluids may be used in low-volume well stimulation of high-permeability sandstone wells (20k to 80k gallons per well) to the high-volume operations such as shale gas and tight gas that use millions of gallons of water per well. Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nepheline Syenite
Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. Phonolite is the fine-grained extrusive equivalent. Petrology Nepheline syenites are silica-undersaturated and some are peralkaline (terms discussed in igneous rock). Nepheline is a feldspathoid, a solid-solution mineral, that does not coexist with quartz; rather, nepheline would react with quartz to produce alkali feldspar. They are distinguished from ordinary basic syenites not only by the presence of nepheline but also by the occurrence of many other minerals rich in alkalis and in rare earths and other incompatible elements. Alkali feldspar dominates, commonly represented by orthoclase and the exsolved lamellar albite, form perthite. In some rocks the potash feldspar, in others the soda feldspar predominates. Fresh clear m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at . Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold. There are many different varieties of quartz, several of which are classified as gemstones. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Eurasia. Quartz is the mineral defining the val ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South China Morning Post
The ''South China Morning Post'' (''SCMP''), with its Sunday edition, the ''Sunday Morning Post'', is a Hong Kong-based English-language newspaper owned by Alibaba Group. Founded in 1903 by Tse Tsan-tai and Alfred Cunningham, it has remained Hong Kong's newspaper of record since British colonial rule. Editor-in-chief Tammy Tam succeeded Wang Xiangwei in 2016. The ''SCMP'' prints paper editions in Hong Kong and operates an online news website. The newspaper's circulation has been relatively stable for years—the average daily circulation stood at 100,000 in 2016. In a 2019 survey by the Chinese University of Hong Kong, the ''SCMP'' was regarded relatively as the most credible paid newspaper in Hong Kong. The ''SCMP'' was owned by Rupert Murdoch's News Corporation from 1986 until it was acquired by Malaysian real estate tycoon Robert Kuok in 1993. On 5 April 2016, Alibaba Group acquired the media properties of the SCMP Group, including the ''SCMP''. In January 2017, former D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Feldspar
Feldspars are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagioclase'' (sodium-calcium) feldspars and the ''alkali'' (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust, and 41% of the Earth's continental crust by weight. Feldspars crystalize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks. Compositions The feldspar group of minerals consists of tectosilicates, silicate minerals in which silicon ions are linked by shared oxygen ions to form a three-dimensional network. Compositions of major elements in common feldspars can be expressed in terms of three endmembers: * potassium feldspar (K-spar) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaolinite
Kaolinite ( ) is a clay mineral, with the chemical composition Al2 Si2 O5( OH)4. It is an important industrial mineral. It is a layered silicate mineral, with one tetrahedral sheet of silica () linked through oxygen atoms to one octahedral sheet of alumina () octahedra. Rocks that are rich in kaolinite are known as kaolin () or china clay. Kaolin is occasionally referred to by the antiquated term lithomarge, from the Ancient Greek ''litho-'' and Latin ''marga'', meaning 'stone of marl'. Presently the name lithomarge can refer to a compacted, massive form of kaolin. The name ''kaolin'' is derived from Gaoling (), a Chinese village near Jingdezhen in southeastern China's Jiangxi Province. The name entered English in 1727 from the French version of the word: , following François Xavier d'Entrecolles's reports on the making of Jingdezhen porcelain. Kaolinite has a low shrink–swell capacity and a low cation-exchange capacity (1–15 meq/100 g). It is a soft, earthy, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foundry
A foundry is a factory that produces metal castings. Metals are cast into shapes by melting them into a liquid, pouring the metal into a mold, and removing the mold material after the metal has solidified as it cools. The most common metals processed are aluminum and cast iron. However, other metals, such as bronze, brass, steel, magnesium, and zinc, are also used to produce castings in foundries. In this process, parts of desired shapes and sizes can be formed. Foundries are one of the largest contributors to the manufacturing recycling movement, melting and recasting millions of tons of scrap metal every year to create new durable goods. Moreover, many foundries use sand in their molding process. These foundries often use, recondition, and reuse sand, which is another form of recycling. Process In metalworking, casting involves pouring liquid metal into a mold, which contains a hollow cavity of the desired shape, and then allowing it to cool and solidify. The solidified pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mine Safety And Health Administration
The Mine Safety and Health Administration (MSHA) () is a large agency of the United States Department of Labor which administers the provisions of the Federal Mine Safety and Health Act of 1977 (Mine Act) to enforce compliance with mandatory safety and health standards as a means to eliminate fatal accidents, to reduce the frequency and severity of nonfatal accidents, to minimize health hazards, and to promote improved safety and health conditions in the nation's mines. MSHA carries out the mandates of the Mine Act at all mining and mineral processing operations in the United States, regardless of size, number of employees, commodity mined, or method of extraction. David Zatezalo was sworn in as Assistant Secretary of Labor for Mine Safety and Health, and head of MSHA, on November 30, 2017. He served until January 20, 2021. Jeannette Galanais served as Acting Assistant Secretary by President Joe Biden on February 1, 2021 until Christopher Williamson took office on April 11, 2022. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Mining Association
The National Mining Association (NMA) is a United States trade organization that lists itself as the voice of the mining industry in Washington, D.C. NMA was formed in 1995, and has more than 300 corporate members. History The National Mining Association was created in 1995. The organization was formed through the merger of the National Coal Association (NCA) and the American Mining Congress (AMC). These two organizations had represented the mining industry since 1897 (AMC) and 1917 (NCA).National Mining AssociatioAbout NMA. Official website of the National Mining Association. Mission and objectives The NMA's mission is "to create and maintain a broad base of political support for the mining industry and to help the nation realize the economic and national security benefits of America's domestic mining capability." The objective of the NMA is "to engage in and influence the public policy process on the most significant and timely issues that impact our ability to locate, permit, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
