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SAG Wismut
SAG/SDAG Wismut was a uranium mining company in East Germany during the time of the Cold War. It produced a total of 230,400 tonnes of uranium between 1947 and 1990 and made East Germany the fourth largest producer of uranium ore in the world at the time. It was the largest single producer of uranium ore in the entire sphere of control of the USSR. In 1991 after German reunification it was transformed into the Wismut GmbH company, owned by the Federal Republic of Germany, which is now responsible for the restoration and environmental cleanup of the former mining and milling areas. The head office of SDAG Wismut / Wismut GmbH is in Chemnitz-Siegmar. History The Ore Mountains (; ) in southern East Germany at the border with the Czech Republic are closely connected to the history of uranium exploitation. The metal was discovered in a sample from a silver mine in the mountain range, and uranium was produced first as a by-product in the early 19th century and later as a main produ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wismut SDAG Logo
Wismut is a German language, German name for bismuth. It may also refer to: * Wismut (company), an East German uranium mining company * Wismut Industrial Union, a trade union * BSG Wismut Gera, a football club in Gera, Thuringia * BSG Wismut Aue, former name of football club FC Erzgebirge Aue {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lavrentii Beria
Lavrentiy Pavlovich Beria ka, ლავრენტი პავლეს ძე ბერია} ''Lavrenti Pavles dze Beria'' ( – 23 December 1953) was a Soviet politician and one of the longest-serving and most influential of Joseph Stalin's secret police chiefs, serving as head of the People's Commissariat for Internal Affairs (NKVD) from 1938 to 1946, during the country's involvement in the Second World War. An ethnic Georgian, Beria enlisted in the Cheka in 1920, and quickly rose through its ranks. He transferred to Communist Party work in the Caucasus in the 1930s, and in 1938 was appointed head of the NKVD by Stalin. His ascent marked the end of the Stalinist Great Purge carried out by Nikolai Yezhov, whom Beria purged. After the Soviet invasion of Poland in 1939, Beria organized the Katyn massacre of 22,000 Polish officers and intelligentsia, and after the occupation of the Baltic states and parts of Romania in 1940, he oversaw the deportations of hundreds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth
Bismuth is a chemical element; it has symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs naturally, and its sulfide and oxide forms are important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery-white color when freshly produced. Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly iridescent appearance due to thin-film interference. Bismuth is both the most diamagnetic element and one of the least thermally conductive metals known. Bismuth was formerly understood to be the element with the highest atomic mass whose nuclei do not spontaneously decay. However, in 2003 it was found to be very slightly radioactive. The metal's only primordial isotope, bismuth-209, undergoes alpha decay with a half-l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver
Silver is a chemical element; it has Symbol (chemistry), symbol Ag () and atomic number 47. A soft, whitish-gray, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Silver is found in the Earth's crust in the pure, free elemental form ("native metal, native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc Refining (metallurgy), refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes bimetallism, alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BiCoNi
The BiCoNi Formation is a hydrothermal lode formation, in which bismuth, cobalt, nickel and uranium ores have coalesced. It occurs mainly in the Ore Mountains and is the youngest formation in the hydrothermal sequence (polymetalliferous (kb) formation, iron-barite (eba) formation, precious brownspar (eb) formation, fluorite-barite (fba) formation, BiCoNi formation). Due to its combination with uranium, it is occasionally also called the bismuth-cobalt-nickel-uranium formation. Genesis The BiCoNi Formation emerged during the contact metamorphic restructuring of sedimentary slate in the course of Variscan granite intrusions during the Subhercynian-Austrian (''Austrisch'') cycle about 100–80 million years ago. It is the product of an intracrustal, epithermal paragenesis. It runs in quartz lode types as the primary ores or cobalt and nickel, which usually occur together with arsenides, native bismuth and pitchblende. Use The BiCoNi Formation has been intensively mined since t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastern Ore Mountains
The Eastern Ore Mountains () form a natural region of Saxony that covers the eastern part (in area almost the eastern half) of the Saxon Ore Mountains range. Together with the Western and Central Ore Mountains, it is part of the larger Saxon Highlands and Uplands region. Its southern continuation beyond the German border covers an area of roughly the same extent in the Czech Republic. Geography The region is bounded in the west by the valley of the Flöha river, itself part of the Central Ore Mountains region. In the northeast it borders on Saxon Switzerland, the German (northern) side of the Elbe Sandstone Mountains, at Bad Gottleuba. The boundary with the Ore Mountain Foreland to the north is rather unclear, roughly running from the town of Flöha along the Tharandt Forest to Tharandt. In the south, the crest of the mountain range closely follows the state border with the Czech Republic. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Ore Mountains
The Central or Middle Ore Mountains ( or ''Mittelerzgebirge'') is a natural region that forms the central-western part of the Ore Mountains in the German federal state of Saxony. It is part of the overarching unit, the Saxon Highlands and Uplands. It forms the eastern part of the former major units, the Lower Western Ore Mountains (''Unteres Westerzgebirge'', 423) and Upper Western Ore Mountains (''Oberes Westerzgebirge'', 421) and is separated from the Eastern Ore Mountains in the east by the (included) valley of the Flöha, and from the Western Ore Mountains in the west by the (excluded) valley of the Schwarzwasser and, below its mouth, by the Zwickauer Mulde.Map of natural regions in Saxony at www.umwelt.sachsen.de (pdf, 859 kB) The upper regions of the Central Or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Ore Mountains
The Western Ore Mountains () is a natural region that forms the westernmost part of the Ore Mountains in the German state of Saxony. It is also part of the major landscape unit known as the Saxon Highlands and Uplands. It extends eastwards to include the valley of the Schwarzwasser, and, below its mouth, that of the Zwickauer Mulde, and incorporates the western parts of the former major units known as the Lower and Upper Western Ore Mountains (''Unteres und Oberes Westerzgebirge''), no. 423, as well as the Southern Slopes of the Ore Mountains (''Südabdachung des Erzgebirges''), no. 420. In the current classification system of natural regions, the Western Ore Mountains only covers the western part of the region that bore the same name in the preceding system, whilst the eastern part of that region is now part of the Central Ore Mountains. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acid Mine Drainage
Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) is the outflow of acidic water from metal mines and coal mines. Acid rock drainage occurs naturally within some environments as part of the rock weathering process but is exacerbated by large-scale earth disturbances characteristic of mining and other large construction activities, usually within rocks containing an abundance of sulfide minerals. Areas where the earth has been disturbed (e.g. construction sites or highway construction) may create acid rock drainage. In many localities, the liquid that drains from coal stocks, coal handling facilities, coal washeries, and coal waste tips can be highly acidic, and in such cases it is treated as acid rock drainage. These, combined with reduced pH, have a detrimental impact on the streams' aquatic environments. The same type of chemical reactions and processes may occur through the disturbance of acid sulfate soils formed under coastal or ... [...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] |
Elbe Sandstone Mountains
The Elbe Sandstone Mountains, also called the Elbe Sandstone Highlands (, ; , ), are a mountain range straddling the border between the state of Saxony in southeastern Germany and the North Bohemian region of the Czech Republic, with about three-quarters of the area lying on the German side. In both countries, core parts of the mountain range have been declared a national park. The name derives from the sandstone which was carved by erosion. The river Elbe breaks through the mountain range in a steep and narrow valley. The Saxon Switzerland and Bohemian Switzerland national parks, known also as Saxon-Bohemian Switzerland, are located within the territory of Elbe Sandstone Mountains. Geography Extent The Elbe Sandstone Mountains extend on both sides of the Elbe from the Saxon town of Pirna in the northwest toward Bohemian Děčín in the southeast. Their highest peak with is the Děčínský Sněžník in Bohemian Switzerland on the left bank of the river in Bohemian Switzerl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adit
An adit (from Latin ''aditus'', entrance) or stulm is a horizontal or nearly horizontal passage to an underground mine. Miners can use adits for access, drainage, ventilation, and extracting minerals at the lowest convenient level. Adits are also used to explore for mineral veins. Although most strongly associated with mining, the term ''adit'' is sometimes also used in the context of underground excavation for non-mining purposes; for example, to refer to smaller underground passageways excavated for underground metro systems, to provide pedestrian access to stations (pedestrian adits), and for access required during construction (construction adits). Construction Adits are driven into the side of a hill or mountain, and are often used when an ore body is located inside the mountain but above the adjacent valley floor or coastal plain. In cases where the mineral vein outcrops at the surface, the adit may follow the lode or vein until it is worked out, in which case the ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
