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Aluchin Horst
The Aluchin Horst (Aluchinskii Massif) is a mountainous geological formation in the Siberian Far East. It is located right below the Arctic Circle, close to the Baimka River, a left tributary of the Bolshoy Anyui River, about 180 km southwest of Bilibino. This horst belongs to the Chukotka Autonomous Okrug administrative division of Russia. There are very significant gold placers and platinum group minerals (PGM) in the Baimka basin, in the immediate vicinity of the Aluchin Horst. References * Geological map of the Aluchin Horst* Gold placer at the Aluchin Horst* Platinum group minerals (PGM) at the Aluchin Horst sites See also * Aluchin (volcano) Aluchin is a volcano along the Aluchin River in the Chukotka Autonomous Okrug of Russia. The volcano was discovered in 1956–1957 by G.K. Kleshchev. Description The volcano is formed by three cones, named Alpha, Beta and Gamma, which occur along ... Mountain ranges of Russia Landforms of Chukotka Autonomous Okrug Horst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siberia
Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a part of Russia since the latter half of the 16th century, after the Russians conquered lands east of the Ural Mountains. Siberia is vast and sparsely populated, covering an area of over , but home to merely one-fifth of Russia's population. Novosibirsk, Krasnoyarsk and Omsk are the largest cities in the region. Because Siberia is a geographic and historic region and not a political entity, there is no single precise definition of its territorial borders. Traditionally, Siberia extends eastwards from the Ural Mountains to the Pacific Ocean, and includes most of the drainage basin of the Arctic Ocean. The river Yenisey divides Siberia into two parts, Western and Eastern. Siberia stretches southwards from the Arctic Ocean to the hills of north-ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arctic Circle
The Arctic Circle is one of the two polar circles, and the most northerly of the five major circles of latitude as shown on maps of Earth. Its southern equivalent is the Antarctic Circle. The Arctic Circle marks the southernmost latitude at which, on the December solstice, the shortest day of the year in the northern hemisphere, the sun will not rise all day, and on the June solstice, the longest day of the year in the northern hemisphere, the sun will not set. These phenomena are referred to as polar night and midnight sun respectively, and the further north one progresses, the more pronounced these effects become. For example, in the Russian port city of Murmansk, three degrees above the Arctic Circle, the sun does not rise for 40 successive days in midwinter. The position of the Arctic Circle is not fixed and currently runs north of the Equator. Its latitude depends on the Earth's axial tilt, which fluctuates within a margin of more than 2° over a 41,000-year period, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bolshoy Anyui River
The Bolshoy Anyuy (russian: Большой Анюй; "Great Anyuy") is a river in the Kolyma basin in Far East Siberia. Administratively most of the basin of the Bolshoy Anyuy and its tributaries belong to the Chukotka Autonomous Okrug of Russia. Geography It flows roughly westwards and passes through the sparsely populated areas of Chukotka, its valley forming the southern border of the Anyuy Range. The Maly Anyuy joins it from the north near the Sakha Republic border and the combined river (now called the Anyuy) properly flows about to meet the Kolyma at Nizhnekolymsk. Its length is and its basin area . [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bilibino
Bilibino (russian: Били́бино) is a town and the administrative center of Bilibinsky District in Chukotka Autonomous Okrug, Russia. It is located northwest of Anadyr, the administrative center of the autonomous okrug. It is the second largest town in the autonomous okrug after Anadyr. Population: Geography The town of Bilibino was built at the confluence of the Karalveyem and Bolshoy Keperveyem Rivers (Kolyma's basin). Bilibino is on the transition zone between the conifer forest and the tundra of the East Siberian Mountains, southeast of the Pyrkanay Range (Горы Пырканай), southwest of the Rauchuan Range (Раучуанский хребет) and north of the Kyrganay Range and the Chuvan Mountains. History As with much of the rest of Chukotka, the earliest human remains found in the region around Bilibino have been dated to the Early Neolithic, with camp sites having been excavated at Orlovka 2, a site on the banks of the Orlovka River, as well as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horst (geology)
In physical geography and geology, a horst is a raised fault block bounded by Fault (geology), normal faults. Horsts are typically found together with Graben, grabens. While a horst lifted or remains stationary, the grabens on either side Subsidence, subside. This is often caused by Extensional tectonics, extensional forces pulling apart the crust. Horsts may represent features such as plateaus, mountains, or ridges on either side of a valley. Horsts can range in size from small fault-blocks, up to large regions of stable continent that have not been not folded or warped by tectonic forces. The word ''Horst'' in German language, German means "mass" or "heap," and was first used in the geological sense in 1883 by Eduard Suess in ''The Face of the Earth.''Originally published in 1883 in German as "Das Antlitz der Erde", translated and published in English in 1904 Geomorphology Horsts may have either symmetrical or asymmetrical cross-sections. If the normal faults to either side ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chukotka Autonomous Okrug
Chukotka (russian: Чуко́тка), officially the Chukotka Autonomous Okrug,, ''Čukotkakèn avtonomnykèn okrug'', is the easternmost federal subjects of Russia, federal subject of Russia. It is an autonomous okrug situated in the Russian Far East, and shares a border with the Sakha, Sakha Republic to the west, Magadan Oblast to the south-west, and Kamchatka Krai to the south. Anadyr (town), Anadyr is the largest types of inhabited localities in Russia, town and the administrative center, capital, and the easternmost settlement to have town status in Russia. Chukotka is primarily populated by ethnic Russians, Chukchi people, Chukchi, and other Indigenous peoples of Siberia, indigenous peoples. It is the only autonomous okrug in Russia that is not included in, or subordinate to, another federal subject, having separated from Magadan Oblast in 1992. It is home to Lake Elgygytgyn, an impact crater lake, and Anyuyskiy, an extinct volcano. The village of Uelen is the easternmos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the world, with its internationally recognised territory covering , and encompassing one-eighth of Earth's inhabitable landmass. Russia extends across Time in Russia, eleven time zones and shares Borders of Russia, land boundaries with fourteen countries, more than List of countries and territories by land borders, any other country but China. It is the List of countries and dependencies by population, world's ninth-most populous country and List of European countries by population, Europe's most populous country, with a population of 146 million people. The country's capital and List of cities and towns in Russia by population, largest city is Moscow, the List of European cities by population within city limits, largest city entirely within E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold
Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in a pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental ( native state), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placer Deposit
In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word ''placer'', meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. Placer materials must be both dense and resistant to weathering processes. To accumulate in placers, mineral particles must have a specific gravity above 2.58. Placer environments typically contain black sand, a conspicuous shiny black mixture of iron oxides, mostly magnetite with variable amounts of ilmenite and hematite. Valuable mineral components often occurring with black sands are monazite, rutile, zircon, chromite, wolframite, and cassiterite. Early mining operations were likely a result ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platinum
Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver". Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes. It is one of the rarer elements in Earth's crust, with an average abundance of approximately 5 μg/kg. It occurs in some nickel and copper ores along with some native deposits, mostly in South Africa, which accounts for ~80% of the world production. Because of its scarcity in Earth's crust, only a few hundred tonnes are produced annually, and given its important uses, it is highly valuable and is a major precious metal commodity. Platinum is one of the least reactive metals. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. Consequent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluchin (volcano)
Aluchin is a volcano along the Aluchin River in the Chukotka Autonomous Okrug of Russia. The volcano was discovered in 1956–1957 by G.K. Kleshchev. Description The volcano is formed by three cones, named Alpha, Beta and Gamma, which occur along a fissure. Alpha, the main cone, formed within a river valley. It is high and has a diameter of . A crater wide and deep caps the cone. Beta, a smaller cone formed by lava and scoria, grew on the southeastern side of Alpha. It ejected lava bombs with sizes of up to that landed in the surrounding valleys. Beta is partially degraded, high and has a wide crater. Gamma is formed by agglomerates. Because the poorly indurated agglomerates are subject to rapid erosion the cone's structure has been heavily degraded. It is high with no recognizable crater and a base size of . Volcanic activity has generated lava flows that fill a valley. These flows cover a surface area of and reach a length of . The total volume reached by the flows is , o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
