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Fort Knox Gold Mine
The Fort Knox Gold Mine is an open pit gold mine, east of Fox in the Fairbanks mining district of Alaska. It is owned and operated by Toronto-based Kinross Gold. Originally staked in 1913, after very minor mining at the location the property sat idle until being restaked in 1980. Following the initial exploration discovery in 1987, in 1992 the project was purchased by Amax Gold, which brought the mine to production. Amax Gold merged with Kinross Gold in 1998. History The land that the Fort Knox mine sits on was originally staked in 1913 when a bismuth-bearing, gold-quartz vein was located. Minor mining occurred with a small shaft and a three-head stamp mill. There had been placer mining in the area as early as 1903 and in 1980 local prospectors Joe Taylor and George Johnson worked the placer deposits. In 1986, the property was leased to various mining companies. In 1992, Amax Gold purchased the property. Construction began 1995 with the first gold pour at the end of 1996. In 199 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fox, Alaska
Fox is a census-designated place (CDP) in Fairbanks North Star Borough, Alaska, United States. It is part of the Fairbanks, Alaska Metropolitan Statistical Area. At the 2010 census the population was 417, up from 300 in 2000. Geography Fox is located at (64.953979, -147.628325), on the bank of Fox Creek as it enters Goldstream Creek Valley, northeast of Fairbanks. Steese Highway and Elliott Highway intersect in Fox. Established as a mining camp in the early 1900s, Fox functions as a bedroom community today and most residents work in nearby Fairbanks or at Fort Knox Gold Mine to the northeast. According to the United States Census Bureau, the CDP has a total area of , all of it land. Demographics Fox first appeared on the 1950 U.S. Census as an unincorporated village. It did not appear again until 1980 when it was made a census-designated place (CDP). As of 2007, there were 353 people, 119 households, and 71 families residing in the CDP. The population density was 22.1 pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...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 or 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, subdivisions, and transportation corridors) 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. This liquid often contains highly toxic metals, such as copper or iron. These, combined with reduced pH, have a detrimental impact on the streams aquatic environments. The same type of chemical reactions and pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stripping Ratio
In surface mining, stripping ratio or strip ratio refers to the amount of waste (or overburden) that must be removed to release a given ore quantity. It is a number or ratio that express how much waste is mined per unit of ore. The units of a stripping ratio can vary between mine types. For example, in coal mining the stripping ratio is commonly referred to as volume/weight., whereas in metal mining, stripping ratio is unitless and is expressed as weight/weight. A stripping ratio can be expressed as a ratio or as a number. Equations The equations for stripping ratio are, for coal: :\frac for metal: :\frac where volume is typically expressed as m3 or yd and weight is typically expressed as tonne or ton. Use It is common for the stripping ratio to be used as an indicator of economic value for an open pit mine. This is because removal of waste is a cost to the mine whereas mining ore leads to revenue. A stripping ratio is commonly used as a quick method to evaluate a mine’s or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinning Ore Crushers
Spin or spinning most often refers to: * Spinning (textiles), the creation of yarn or thread by twisting fibers together, traditionally by hand spinning * Spin, the rotation of an object around a central axis * Spin (propaganda), an intentionally biased portrayal of something Spin, spinning or spinnin may also refer to: Physics and mathematics * Spin, the rotation of an object around a central axis * Spin (physics) or particle spin, a fundamental property of elementary particles * Spin group, a particular double cover of the special orthogonal group SO(''n'') * Spin tensor, a tensor quantity for describing spinning motion in special relativity and general relativity * Spin (aerodynamics), autorotation of an aerodynamically stalled aeroplane * SPIN bibliographic database, an indexing and abstracting service focusing on physics research Textile arts * Spinning (polymers), a process for creating polymer fibres * Spinning (textiles), the creation of yarn or thread by twisting fibe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon Publications
Moon is a travel guidebook publisher founded in 1973 in Chico, California. The company started with travel guides to Asia and later also published guides to the Americas. The company is now based in Berkeley, California and published by Avalon Travel, a member of the Perseus Books Group Perseus Books Group was an American publishing company founded in 1996 by investor Frank Pearl. Perseus acquired the trade publishing division of Addison-Wesley (including the Merloyd Lawrence imprint) in 1997. It was named Publisher of the Ye .... External links Official Moon Travel Guidebooks website {{Perseus Books Group Travel guide books ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heap Leaching
Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials. Similar to in situ mining, heap leach mining differs in that it places ore on a liner, then adds the chemicals via drip systems to the ore, whereas ''in situ'' mining lacks these liners and pulls pregnant solution up to obtain the minerals. Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates at a lower cost compared to conventional processing methods such as flotation, agitation, and vat leaching. Additionally, dump leaching is an essential part of most copper mining operations and determines the quality grade of the produced material along with other factors Due to the profitability that the dump leaching has on the mining process, i.e. it can contribute substanti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral Processing
In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the process of separating commercially valuable minerals from their ores. History Before the advent of heavy machinery the raw ore was broken up using hammers wielded by hand, a process called "spalling". Before long, mechanical means were found to achieve this. For instance, stamp mills were used in Samarkand as early as 973. They were also in use in medieval Persia. By the 11th century, stamp mills were in widespread use throughout the medieval Islamic world, from Islamic Spain and North Africa in the west to Central Asia in the east. A later example was the Cornish stamps, consisting of a series of iron hammers mounted in a vertical frame, raised by cams on the shaft of a waterwheel and falling onto the ore under gravity. The simplest method of separating ore from gangue consists of picking out the individual crystals of each. This is a very tedious process, particularly when the in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fairbanks, Alaska
Fairbanks is a home rule city and the borough seat of the Fairbanks North Star Borough in the U.S. state of Alaska. Fairbanks is the largest city in the Interior region of Alaska and the second largest in the state. The 2020 Census put the population of the city proper at 32,515, and the population of the Fairbanks North Star Borough at 95,655 making it the second most populous metropolitan area in Alaska after Anchorage. The Metropolitan Statistical Area encompasses all of the Fairbanks North Star Borough and is the northernmost Metropolitan Statistical Area in the United States, located by road ( by air) south of the Arctic Circle. Fairbanks is home to the University of Alaska Fairbanks, the founding campus of the University of Alaska system. History Native American presence Athabascan peoples have used the area for thousands of years, although there is no known permanent Alaska Native settlement at the site of Fairbanks. An archaeological site excavated on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mineral Resource Classification
There are several classification systems for the economic evaluation of mineral deposits worldwide. The most commonly used schemes base on the International Reporting Template, developed by the CRIRSCO - Committee for Mineral Reserves International Reporting Standards, like the Australian Joint Ore Reserves Committee - JORC Code 2012, the Pan-European Reserves & Resources Reporting Committee' – PERC Reporting Standard from 2021, the Canadian Institute of Mining, Metallurgy and Petroleum - CIM classification and the South African Code for the Reporting of Mineral Resources and Mineral Reserves (SAMREC). A more detailed description of the historical development concerning reporting about mineral deposits can be found on the PERC web site. Mineral resources A 'Mineral Resource' is a concentration or occurrence of material of intrinsic economic interest in or on the earth's crust in such form, quality and quantity that there are reasonable prospects for eventual economic extraction. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pegmatite
A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer intermediate composition and mafic pegmatites are known. Many of the world's largest crystals are found within pegmatites. These include crystals of microcline, quartz, mica, spodumene, beryl, and tourmaline. Some individual crystals are over long. Most pegmatites are thought to form from the last fluid fraction of a large crystallizing magma body. This residual fluid is highly enriched in volatiles and trace elements, and its very low viscosity allows molecules to migrate rapidly to join an existing crystal rather than coming together to form new crystals. This allows a few very large crystals to form. While most pegmatites have a simple composition of minerals common in ordinary igneous rock, a few ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tellurium
Tellurium is a chemical element with the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionally found in native form as elemental crystals. Tellurium is far more common in the Universe as a whole than on Earth. Its extreme rarity in the Earth's crust, comparable to that of platinum, is due partly to its formation of a volatile hydride that caused tellurium to be lost to space as a gas during the hot nebular formation of Earth.Anderson, Don L.; "Chemical Composition of the Mantle" in ''Theory of the Earth'', pp. 147-175 Tellurium-bearing compounds were first discovered in 1782 in a gold mine in Kleinschlatten, Transylvania (now Zlatna, Romania) by Austrian mineralogist Franz-Joseph Müller von Reichenstein, although it was Martin Heinrich Klaproth who named the new element in 1798 after the Latin 'earth'. Gold telluride minerals ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
