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Strip-mining
Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which the overlying rock is left in place, and the mineral is removed through shafts or tunnels. In North America, where the majority of surface coal mining occurs, this method began to be used in the mid-16th century and is practiced throughout the world in the mining of many different minerals. In North America, surface mining gained popularity throughout the 20th century, and surface mines now produce most of the coal mined in the United States. In most forms of surface mining, heavy equipment, such as earthmovers, first remove the overburden. Next, large machines, such as dragline excavators or bucket-wheel excavators, extract the mineral. The pros of surface mining are that it has a lower financial cost and is a lot safer than undergrou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dragline Excavator
A dragline excavator is a piece of heavy equipment used in civil engineering and surface mining. Draglines fall into two broad categories: those that are based on standard, lifting cranes, and the heavy units which have to be built on-site. Most crawler cranes, with an added winch drum on the front, can act as a dragline. These units (like other cranes) are designed to be dismantled and transported over the road on flatbed trailers. Draglines used in civil engineering are almost always of this smaller, crane type. These are used for road, port construction, pond and canal dredging, and as pile driving rigs. These types are built by crane manufacturers such as Link-Belt and Hyster. The much larger type which is built on site is commonly used in strip-mining operations to remove overburden above coal and more recently for oil sands mining. The largest heavy draglines are among the largest mobile land machines ever built. The smallest and most common of the heavy type weigh a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siilinjärvi Mine
Siilinjärvi () is a municipality of Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B .... It is located in Northern Savonia, north of the city of Kuopio, which largely surrounds Siilinjärvi. Another neighbour municipality with Kuopio is Lapinlahti. The name, in Finnish, apparently translates literally as "Hedgehog's Lake", although its etymology actually stems from a Sámi languages, Sámi word meaning winter dwelling. Lakes are essential part of the geography of Siilinjärvi. There are 123 lakes, and the biggest of them are Kallavesi and Juurusvesi–Akonvesi. Water area is 106.85 km2, which is 21% of the whole area of Siilinjärvi. The median age is relatively low; 23% of the population are under 15 years old. Siilinjärvi has eleven elementary schools and two second ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outcrop
An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. Features Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by soil and vegetation and cannot be seen or examined closely. However, in places where the overlying cover is removed through erosion or tectonic uplift, the rock may be exposed, or ''crop out''. Such exposure will happen most frequently in areas where erosion is rapid and exceeds the weathering rate such as on steep hillsides, mountain ridges and tops, river banks, and tectonically active areas. In Finland, glacial erosion during the last glacial maximum (ca. 11000 BC), followed by scouring by sea waves, followed by isostatic uplift has produced many smooth coastal and littoral outcrops. Bedrock and superficial deposits may also be exposed at the Earth's surface due to human excavations such as quarrying and build ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floyd County, Kentucky
Floyd County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 35,942. Its county seat is Prestonsburg. The county, founded in 1800, is named for Colonel John Floyd (1750–1783). History On December 13, 1799, the Kentucky General Assembly passed legislation to form Floyd County as the 40th county of Kentucky.Kleber, John E. ''The Kentucky Encyclodpedia'' (University Press of Kentucky), p. 330 The county was made from parts of Fleming, Montgomery, and Mason County, Kentucky. The legislation became effective on June 1, 1800. The county was named for James John Floyd, a pioneer surveyor who helped lay out the city of Louisville. The county seat was Preston's Station, later renamed Prestonsburg. The first court house burned down on April 8, 1808, destroying all the early records, so the earliest records of government activity do not date prior to 1808. Prestonsburg was used as a Confederate stronghold during the Civil War and two battl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mingo County, West Virginia
Mingo County is a county in the U.S. state of West Virginia. As of the 2020 census, the population was 23,568. Its county seat and largest city is Williamson. Created in 1895, Mingo is West Virginia's newest county, named for the historic Iroquoian Mingo people. (WV County Etymology) History Mingo County is West Virginia's newest county, formed by an act of the state legislature in 1895 from parts of Logan County. The county was named for the Mingo Indians. At the time of its creation, Mingo County was divided into magisterial districts, which the United States Census Bureau classifies as a type of non-functional subdivision serving purely administrative purposes.United States Census Bureau, U.S. Decennial Census, Tables of Minor Civil Divisions in West Virginia, 1870–2010. After West Virginia's establishment in 1863, its counties were initially divided into civil townships, with the intent to encourage local government. This proved impractical in the heavily rural state, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin County, Kentucky
Martin County is a county located in the U.S. state of Kentucky. As of the 2010 census, the population was 12,929. Its county seat is Inez. The county was founded in 1870 and is named for Congressman John Preston Martin. Warfield, Kentucky, is the only non- dry city in the county. History Martin County was formed in 1870. The county was named after John Preston Martin. The first County Seat was located in Warfield KY. But it was moved to the current county seat of Inez (Eden at the time) Due to it being more centralized in the county. The Martin County Jail closed has a full service jail in 1988 and was a holdover facility until the late 90s. In 1964 President Lyndon Johnson visited Inez to start the war on poverty. He visited Tom Fletcher House in Unincorporated part of the county. A lot of the county for the longest time relied on the coal industry. But since the decline of the coal industry. County and state officials have tried to bring new industry to Martin County. Mart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Penitentiary, Big Sandy
The United States Penitentiary, Big Sandy (USP Big Sandy) is a high-security United States federal prison for male inmates in unincorporated Martin County, Kentucky, near the city of Inez. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has a satellite prison camp which houses minimum-security male inmates. USP Big Sandy is located in eastern Kentucky, approximately from Lexington, from Frankfort, and from Washington, DC. Facility USP Big Sandy is located both on a mountaintop removal mining site and a former underground coal mine. Due to the underground mine, the federal government spent $40 million to remediate the site before construction and had to spend additional millions after construction began to fix further issues, making the project the most expensive federal prison project at the time. Harvard University owned the oil and gas rights to the property and was leasing that property to Columbia G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Borrow Pit
Digging, also referred to as excavation, is the process of using some implement such as claws, hands, manual tools or heavy equipment, to remove material from a solid surface, usually soil, sand or rock on the surface of Earth. Digging is actually the combination of two processes, the first being the breaking or cutting of the surface, and the second being the removal and relocation of the material found there.Carl Dreher,The Right Way to Dig, ''Popular Science'' (March 1957), p. 179. In a simple digging situation, this may be accomplished in a single motion, with the digging implement being used to break the surface and immediately fling the material away from the hole or other structure being dug. Many kinds of animals engage in digging, either as part of burrowing behavior or to search for food or water under the surface of the ground.Zen Faulkes,Morphological Adaptations for Digging and Burrowing (2013), p. 276-295. Historically, humans have engaged in digging for both of thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minerals
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Minerals'; p. 1. In the series ''Geology: Landforms, Minerals, and Rocks''. Rosen Publishing Group. The geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or are organic compounds in the sense of chemistry (such as mellite). Moreover, living organisms often synthesize inorganic minerals (such as hydroxylapatite) that also occur in rocks. The concept of mineral is distinct from rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale. A rock may consist of one type of mineral, or may be an aggregate of two or more different types of minerals, spacially segregated into distinct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock (geology)
In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects. Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments, which in turn are formed by the weathering, transport, and deposition of existing ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Open-pit Mining
Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, is a surface mining technique of extracting rock or minerals from the earth from an open-air pit, sometimes known as a borrow. This form of mining differs from extractive methods that require tunnelling into the earth, such as long wall mining. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface. It is applied to ore or rocks found at the surface because the overburden is relatively thin or the material of interest is structurally unsuitable for tunnelling (as would be the case for cinder, sand, and gravel). In contrast, minerals that have been found underground but are difficult to retrieve due to hard rock, can be reached using a form of underground mining. To create an open-pit mine, the miners must determine the information of the ore that is underground. This is done through drilling of probe holes in the ground, then plotting ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
