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Sunshine Mine
The Sunshine Mine is located between the cities of Kellogg, Idaho, Kellogg and Wallace, Idaho, Wallace in northern Idaho. It has been one of the world's largest and most profitable silver mines, having produced over 360 million ounces of silver by 2001. A 2007 Canada, Canadian report by Behre Dolbear & Company estimated measured and indicated resources of 31.51 million ounces of silver in 1.43 million tons at 21.8 ounces of silver per ton and inferred resources of 231.5 million ounces of silver in 2.28 million tons at 101.6 ounces of silver per ton. The Behre Dolbear report is considered historic in nature and illustrates the resource potential of the Sunshine Mine. From historical records beginning in 1904, the Sunshine Mine has produced 364,893,421 ounces of silver from 12,953,045 tons of ore through 2001, when the mine was closed. From January 1, 1998, to January 1, 2004, the average reserves carried by the mine were 1.38 million tons, containing 32.20 million ounces of silv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Valley (Idaho)
The Silver Valley is a region in the northwest United States, in the Coeur d'Alene Mountains in northern Idaho. It is noted for its mining heritage, dating back to the 1880s. Geography Silver Valley is a narrow valley about in length, east of the city of Coeur d'Alene. The South Fork of the Coeur d'Alene River flows through the valley and Interstate 90 traverses the valley between Fourth of July Pass to the west and Lookout Pass on the Montana border. Several towns are located in the valley, all in Shoshone County. These include (from west to east) Pinehurst, Smelterville, Kellogg, Wardner, Osburn, Silverton, Wallace, and Mullan. The Silver Valley has also been referred to as the Coeur d'Alene Valley and the Coeur d'Alene Mining District. Geology The Coeur d'Alene (Silver Valley) Mining District is located in Proterozoic metasediments. The mined portion of the stratigraphic column in the Silver Valley, known as the Belt series, can be divided into six main fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williams Act
The Williams Act (USA) refers to 1968 amendments to the Securities Exchange Act of 1934 enacted in 1968 regarding tender offers. The legislation was proposed by Senator Harrison A. Williams of New Jersey. The Williams Act amended the Securities and Exchange Act of 1934 (15 U.S.C. § 78a et seq.) to require mandatory disclosure of information regarding cash tender offers. When an individual, group, or corporation seeks to acquire control of another corporation, it may make a tender offer. A tender offer is a proposal to buy shares of stock from the stockholders for cash or some type of corporate security of the acquiring company. Since the mid-1960s, cash tender offers for corporate takeovers have become favored over the traditional alternative, the proxy campaign. A proxy campaign is an attempt to obtain the votes of enough shareholders to gain control of the corporation's board of directors. Because of abuses with cash tender offers, Congress passed the Williams Act in 1968, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siderite
Siderite is a mineral composed of iron(II) carbonate (FeCO3). Its name comes from the Ancient Greek word (), meaning "iron". A valuable iron ore, it consists of 48% iron and lacks sulfur and phosphorus. Zinc, magnesium, and manganese commonly substitute for the iron, resulting in the siderite-smithsonite, siderite-magnesite, and siderite-rhodochrosite solid solution series. Siderite has Mohs hardness of 3.75 to 4.25, a specific gravity of 3.96, a white streak and a vitreous or pearly luster. Siderite is antiferromagnetic below its Néel temperature of that can assist in its identification. It crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces. It also occurs in masses. Color ranges from yellow to dark brown or black, the latter being due to the presence of manganese. Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It is also a common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike And Dip
In geology, strike and dip is a measurement convention used to describe the plane orientation or Attitude (geometry), attitude of a Plane (geometry), planar Geology, geologic feature. A feature's strike is the azimuth of an imagined horizontal line across the plane, and its dip is the angle of inclination (or depression angle) measured downward from horizontal. They are used together to measure and document a structure's characteristics for study or for use on a geological map. A feature's orientation can also be represented by dip and dip direction, using the azimuth of the dip rather than the strike value. Linear features are similarly measured with trend and plunge, where "trend" is analogous to dip direction and "plunge" is the dip angle. Strike and dip are measured using a compass and a clinometer. A compass is used to measure the feature's strike by holding the compass horizontally against the feature. A clinometer measures the feature's dip by recording the inclination pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vein (geology)
In geology, a vein is a distinct sheetlike body of crystallized minerals within a rock. Veins form when mineral constituents carried by an aqueous solution within the rock mass are deposited through precipitation. The hydraulic flow involved is usually due to hydrothermal circulation. Veins are classically thought of as being planar fractures in rocks, with the crystal growth occurring normal to the walls of the cavity, and the crystal protruding into open space. This certainly is the method for the formation of some veins. However, it is rare in geology for significant open space to remain open in large volumes of rock, especially several kilometers below the surface. Thus, there are two main mechanisms considered likely for the formation of veins: ''open-space filling'' and ''crack-seal growth''. Open space filling Open space filling is the hallmark of epithermal vein systems, such as a stockwork, in greisens or in certain skarn environments. For open space fillin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anticline
In structural geology, an anticline is a type of Fold (geology), fold that is an arch-like shape and has its oldest Bed (geology), beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex curve, convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that Strike and dip, dip away from the hinge. Anticlines can be recognized and differentiated from antiforms by a sequence of rock layers that become progressively older toward the center of the fold. Therefore, if age relationships between various Stratum, rock strata are unknown, the term antiform should be used. The progressing age of the rock strata towards the core and uplifted center, are the trademark indications for evidence of anticlines on a geological map. These formations occur because anticlinal ridges typically develop above thrust faults during crustal deformations. The uplifted core of the fold cau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a Fracture (geology), planar fracture or discontinuity in a volume of Rock (geology), rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust (geology), crust result from the action of Plate tectonics, plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction, subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the Plane (geometry), plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Valley, Idaho
The Silver Valley is a region in the Pacific Northwest, northwest United States, in the Coeur d'Alene Mountains in Idaho Panhandle, northern Idaho. It is noted for its mining heritage, dating back to the 1880s. Geography Silver Valley is a narrow valley about in length, east of the city of Coeur d'Alene, Idaho, Coeur d'Alene. The South Fork of the Coeur d'Alene River flows through the valley and Interstate 90 in Idaho, Interstate 90 traverses the valley between Fourth of July Summit, Fourth of July Pass to the west and Lookout Pass on the Montana border. Several towns are located in the valley, all in Shoshone County, Idaho, Shoshone County. These include (from west to east) Pinehurst, Idaho, Pinehurst, Smelterville, Idaho, Smelterville, Kellogg, Idaho, Kellogg, Wardner, Idaho, Wardner, Osburn, Idaho, Osburn, Silverton, Idaho, Silverton, Wallace, Idaho, Wallace, and Mullan, Idaho, Mullan. The Silver Valley has also been referred to as the Coeur d'Alene Valley and the Coeur d' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belt Supergroup
The Belt Supergroup is an assemblage of primarily fine-grained sedimentary rocks and mafic intrusive rocks of late Precambrian (Mesoproterozoic) age. It is more than thick, covers an area of some 200,000 km2 (77,220 sq. mi), and is considered to be one of the world's best-exposed and most accessible sequences of Mesoproterozoic rocks. It was named after the Big Belt Mountains in west-central Montana. It is present in western Montana and northern Idaho, with minor occurrences in northeastern Washington (U.S. state), Washington and western Wyoming. It extends into Canada where the equivalent rocks, which are called the Purcell Supergroup, are exposed in southeastern British Columbia and southwestern Alberta. The rocks of the Belt Supergroup contain economically significant deposits of lead, zinc, silver, copper, gold, and other metals in a number of areas, and some of the Belt rocks contain fossil stromatolites. Spectacular outcrops of Belt rocks can be seen in Glacier National Par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Kaplan
Thomas Scott Kaplan (born September 14, 1962) is a Franco-American businessman, philanthropist and art collector. He is the world's largest private collector of Rembrandt's works. Kaplan is the chairman and chief investment officer of The Electrum Group LLC, a New York City-based investment, advisory and asset management firm with a focus on the natural resources sector. Since 2017, he has been the chairman of the International Alliance for the Protection of Heritage in Conflict Areas (ALIPH), a Geneva-based foundation established by France and the United Arab Emirates. Early life and education Born in New York City, Kaplan is the son of Lillian Jean Kaplan and Jason "Jay" Kaplan. He and his family are Jewish. In his youth, Kaplan developed a passion for wildlife conservation and for Rembrandt, which later inspired him to found the field conservation group Panthera and The Leiden Collection, the world's largest private grouping of works from the Dutch Golden Age. At Oxford ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margin Calls
In finance, margin is the collateral that a holder of a financial instrument has to deposit with a counterparty (most often their broker or an exchange) to cover some or all of the credit risk the holder poses for the counterparty. This risk can arise if the holder has done any of the following: * Borrowed cash from the counterparty to buy financial instruments, * Borrowed financial instruments to sell them short, * Entered into a derivative contract. The collateral for a margin account can be the cash deposited in the account or securities provided, and represents the funds available to the account holder for further share trading. On United States futures exchanges, margins were formerly called performance bonds. Most of the exchanges today use SPAN ("Standard Portfolio Analysis of Risk") methodology, which was developed by the Chicago Mercantile Exchange in 1988, for calculating margins for options and futures. Margin account A margin account is a loan account with a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Volcker
Paul Adolph Volcker Jr. (September 5, 1927 – December 8, 2019) was an American economist who served as the 12th chair of the Federal Reserve, chairman of the Federal Reserve from 1979 to 1987. During his tenure as chairman, Volcker was widely credited with having ended the high levels of inflation seen in the United States throughout the 1970s and early 1980s, with measures known as the ''Volcker shock''. He previously served as the List of presidents of the Federal Reserve Bank of New York, president of the Federal Reserve Bank of New York from 1975 to 1979. President Jimmy Carter nominated him to succeed G. William Miller as Fed chairman and President Ronald Reagan renominated him once. Volcker did not seek a third term at the Fed and was succeeded by Alan Greenspan. After his retirement from the Board, he chaired the Economic Recovery Advisory Board under President Barack Obama from 2009 to 2011 during the subprime mortgage crisis. Early life and education Volcker was born ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
