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Hosokura Mine
The was one of the largest lead and zinc mines in Japan. The mine was located in the town of Uguisuzawa, Miyagi Prefecture in the Tohoku region of northern Japan, in what is now the city of Kurihara. The mine had production of 26 million tonnes of ore grading 1.59% lead, 4.12% zinc and 12.8 million oz of silver before closing in 1987. Background The Hosokura mine was located in the Ōu Mountains the northwest part of Miyagi prefecture. The mine extended for about 5 kilometers east-west and about 3 kilometers north and south and had ten major veins and over 150 minor veins of mineral deposits, with the vein width ranging from 12 meters to 15 meters at maximum, but on average 1.3 meters. Major minerals include galena, zinc blende and pyrite, along with smaller amounts of silver, copper, bismuth, cadmium, and gold. History According to tradition, the mine was discovered in the 9th century, making it one of the oldest in Japan. However, historical records are almost non-existent unt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kurihara, Miyagi
Kurihara City Hall is a city located in Miyagi Prefecture, Japan. , the city had an estimated population of 66,565, and a population density of 83 persons per km2 in 24,994 households. The total area of the city is . Parts of the city are within the borders of the Kurikoma Quasi-National Park. Geography Kurihara covers a part of the northwestern corner of Miyagi Prefecture. It is mostly rice farmland, and small mountain ridges, the largest of which cluster around Mount Kurikoma, the tallest mountain in Kurihara, which is located at the furthest northwestern point of Miyagi Prefecture. In summer, the lotus on Lake Izunuma bloom. In fall, Mount Kurikoma is covered in fall colors and in winter migrating swans and geese come in flocks to spend the season on Kurihara's lakes. Neighboring municipalities Miyagi Prefecture * Tome * Ōsaki Akita Prefecture * Yuzawa * Higashinaruse Iwate Prefecture *Ichinoseki Climate The climate of Kurihara is classified as humid subtropical (Cfa) per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copper
Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in a directly usable metallic form ( native metals). This led to very early human use in several regions, from circa 8000 BC. Thousands of years later, it was the first metal to be smelted from sulfide ores, circa 5000 BC; the first metal to be cast into a shape in a mold, c. 4000 BC; and the first metal to be purposely alloyed with another metal, tin, to create ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lead And Zinc Mines In Japan
Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is toxic, even in small amounts, especially to children. Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases, and it tends to form covalent bonds. Compounds of lead are usually found in the +2 oxidation state rather than the +4 state common with lighter members of the carbon group. Exceptions are mostly limited to organolead compounds. Like the lighter members of the group, lea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Former Mines In Japan
A former is an object, such as a template, gauge or cutting die, which is used to form something such as a boat's hull. Typically, a former gives shape to a structure that may have complex curvature. A former may become an integral part of the finished structure, as in an aircraft fuselage, or it may be removable, being using in the construction process and then discarded or re-used. Aircraft formers Formers are used in the construction of aircraft fuselage, of which a typical fuselage has a series from the nose to the empennage, typically perpendicular to the longitudinal axis of the aircraft. The primary purpose of formers is to establish the shape of the fuselage and reduce the column length of stringers to prevent instability. Formers are typically attached to longerons, which support the skin of the aircraft. The "former-and-longeron" technique (also called stations and stringers) was adopted from boat construction, and was typical of light aircraft built until the ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies and the Axis powers. World War II was a total war that directly involved more than 100 million personnel from more than 30 countries. The major participants in the war threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and deploying the only two nuclear weapons ever used in war. World War II was by far the deadliest conflict in human history; it resulted in 70 to 85 million fatalities, mostly among civilians. Tens of millions died due to genocides (including the Holocaust), starvation, ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meiji Restoration
The , referred to at the time as the , and also known as the Meiji Renovation, Revolution, Regeneration, Reform, or Renewal, was a political event that restored practical imperial rule to Japan in 1868 under Emperor Meiji. Although there were ruling emperors before the Meiji Restoration, the events restored practical abilities and consolidated the political system under the Emperor of Japan. The goals of the restored government were expressed by the new emperor in the Charter Oath. The Restoration led to enormous changes in Japan's political and social structure and spanned both the late Edo period (often called the Bakumatsu) and the beginning of the Meiji era, during which time Japan rapidly Industrialisation, industrialized and adopted Western culture, Western ideas and production methods. Foreign influence The Japanese knew they were behind the Western powers when US Commodore (United States), Commodore Matthew C. Perry came to Japan in 1853 in Black Ships, large warshi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edo Period
The or is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's 300 regional '' daimyo''. Emerging from the chaos of the Sengoku period, the Edo period was characterized by economic growth, strict social order, isolationist foreign policies, a stable population, perpetual peace, and popular enjoyment of arts and culture. The period derives its name from Edo (now Tokyo), where on March 24, 1603, the shogunate was officially established by Tokugawa Ieyasu. The period came to an end with the Meiji Restoration and the Boshin War, which restored imperial rule to Japan. Consolidation of the shogunate The Edo period or Tokugawa period is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's regional '' daimyo''. A revolution took place from the time of the Kamakura shogunate, which existed with the Tennō's court, to the Tok ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Date Clan
The is a Japanese samurai kin group. Papinot, Jacques Edmond Joseph. (1906). ''Dictionnaire d’histoire et de géographie du Japon''; Papinot, (2003)"Date", ''Nobiliare du Japon'', p. 5 retrieved 2013-5-5. History The Date family was founded in the early Kamakura period (1185–1333) by Isa Tomomune who originally came from the Isa district of Hitachi Province (now Ibaraki Prefecture), and was a descendant of Fujiwara no Uona (721–783) in the sixteenth generation. The family took its name from the Date district (now Date City in Fukushima Prefecture) of Mutsu Province which had been awarded in 1189 to Isa Tomomune by Minamoto no Yoritomo, the first Kamakura shōgun, for his assistance in the Genpei War and in Minamoto no Yoritomo's struggle for power with his brother, Minamoto no Yoshitsune. During the Nanboku-chō Wars in the 1330s, the Date supported the Imperial Southern Court of Emperor Go-Daigo through Kitabatake Akiie, who had been appointed Commander in Chief ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sendai Domain
The , also known as the , was a domain of the Tokugawa Shogunate of Japan during the Edo period from 1600 to 1871. The Sendai Domain was based at Aoba Castle in Mutsu Province, in the modern city of Sendai, located in the Tōhoku region of the island of Honshu. The Sendai Domain was ruled for its existence by the '' tozama'' ''daimyō'' of the Date, and under the ''kokudaka'' system its income rating at 625,000 ''koku'' was the third-largest domain in Japan after the Satsuma Domain and Kaga Domain. The Sendai Domain was geographically the largest domain in northern Japan with its mostly-contiguous holdings covering most of southern Mutsu Province, including all of present-day Miyagi Prefecture, parts of southern Iwate Prefecture and northeastern Fukushima Prefecture. The Sendai Domain was the focal member of the Ōuetsu Reppan Dōmei against the Meiji Restoration during the Boshin War. The Sendai Domain was dissolved in the abolition of the han system in 1871 by the Meiji governme ... [...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] |
Cadmium
Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and 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 groups 3 through 11. Cadmium and its 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 Stromeyer and Hermann, both in Germany, as an impurity in zinc carbonate. Cadmium occurs as a minor component in most zinc ores and is a byproduct of zinc production. Cadmium was used for a long time as a corrosion-resistant plating on steel, and cadmium compounds are used as red, orang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth
Bismuth is a chemical element with the Symbol (chemistry), 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. Passivation (chemistry), Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly Iridescence, iridescent appearance due to thin-film interference. Bismuth is both the most Diamagnetism, diamagnetic element and one of the least Thermal conductivity, thermally conductive metals known. Bismuth was long considered the element with the highest atomic mass whose nuclei do not spontaneously decay. However, in 2003 it was discovered to be extremely weakly radioactive. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
