Copper is a chemical element with symbol Cu and atomic number 29. It is a soft and ductile metal with 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, as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals; this led to early human use in several regions, from c. 8000 BC. Thousands of years it was the first metal to be smelted from sulfide ores, c. 5000 BC, the first metal to be cast into a shape in a mold, c. 4000 BC and the first metal to be purposefully alloyed with another metal, tin, to create bronze, c. 3500 BC. In the Roman era, copper was principally mined on Cyprus, the origin of the name of the metal, from aes сyprium corrupted to сuprum, from which the words derived and copper, first used around 1530.
The encountered compounds are copper salts, which impart blue or green colors to such minerals as azurite and turquoise, have been used and as pigments. Copper used in buildings for roofing, oxidizes to form a green verdigris. Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as bacteriostatic agents and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the iron-complexed hemoglobin in fish and other vertebrates. In humans, copper is found in the liver and bone; the adult body contains between 2.1 mg of copper per kilogram of body weight. Copper and gold are in group 11 of the periodic table; the filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds.
Unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are weak. This observation explains the low high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms; the softness of copper explains its high electrical conductivity and high thermal conductivity, second highest among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature originates from scattering of electrons on thermal vibrations of the lattice, which are weak in a soft metal; the maximum permissible current density of copper in open air is 3.1×106 A/m2 of cross-sectional area, above which it begins to heat excessively. Copper is one of a few metallic elements with a natural color other than silver.
Pure copper acquires a reddish tarnish when exposed to air. The characteristic color of copper results from the electronic transitions between the filled 3d and half-empty 4s atomic shells – the energy difference between these shells corresponds to orange light; as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. Copper does not react with water, but it does react with atmospheric oxygen to form a layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion. A green layer of verdigris can be seen on old copper structures, such as the roofing of many older buildings and the Statue of Liberty. Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising 69% of occurring copper. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours.
Seven metastable isotopes have been characterized. Isotopes with a mass number above 64 decay by β−, whereas those with a mass number below 64 decay by β+. 64Cu, which has a half-life of 12.7 hours, decays both ways.62Cu and 64Cu have significant applications. 62Cu is used in 62Cu-PTSM as a radioactive tracer for positron emission tomography. Copper is produced in massive stars and is present in the Earth's crust in a proportion of about 50 parts per million. In nature, copper occurs in a variety of minerals, including native copper, copper sulfides such as chalcopyrite, digenite and chalcocite, copper sulfosalts such as tetrahedite-tennantite, enargite, copper carbonates such as azurite and malachite, as copper or copper oxides such as cuprite and tenorite, respectively; the largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal
Modern United States commemorative coins
The United States resumed minting commemorative coins in 1982 for the 250th anniversary of the birth of George Washington. Modern commemoratives tend to be restricted to events and personalities of national or international importance. While silver dollars remain the traditional denomination, low-value circulating commemoratives have gained in popularity. 50 State Quarters Early United States commemorative coins "Coin Value Guide." Coins 60: 83-88 Category:Modern United States commemorative coins
The Louisiana Purchase was the acquisition of the Louisiana territory of New France by the United States from France in 1803. The U. S. paid fifty million francs and a cancellation of debts worth eighteen million francs for a total of sixty-eight million francs. The Louisiana territory included land from fifteen present U. S. states and two Canadian provinces. The territory contained land that forms Arkansas, Iowa, Oklahoma and Nebraska, its non-native population was around 60,000 inhabitants. The Kingdom of France controlled the Louisiana territory from 1699 until it was ceded to Spain in 1762. In 1800, Napoleon the First Consul of the French Republic, hoping to re-establish an empire in North America, regained ownership of Louisiana. However, France's failure to put down the revolt in Saint-Domingue, coupled with the prospect of renewed warfare with the United Kingdom, prompted Napoleon to sell Louisiana to the United States to fund his military; the Americans sought to purchase only the port city of New Orleans and its adjacent coastal lands, but accepted the bargain.
The Louisiana Purchase occurred during the term of the third President of the United States, Thomas Jefferson. Before the purchase was finalized, the decision faced Federalist Party opposition. Jefferson agreed that the U. S. Constitution did not contain explicit provisions for acquiring territory, but he asserted that his constitutional power to negotiate treaties was sufficient. Throughout the second half of the 18th century, Louisiana was a pawn on the chessboard of European politics, it was controlled by the French, who had a few small settlements along the Mississippi and other main rivers. France ceded the territory to Spain in the secret Treaty of Fontainebleau. Following French defeat in the Seven Years' War, Spain gained control of the territory west of the Mississippi and the British the territory to the east of the river. Following the establishment of the United States, the Americans controlled the area east of the Mississippi and north of New Orleans; the main issue for the Americans was free transit of the Mississippi to the sea.
As the lands were being settled by a few American migrants, many Americans, including Jefferson, assumed that the territory would be acquired "piece by piece." The risk of another power taking it from a weakened Spain made a "profound reconsideration" of this policy necessary. New Orleans was important for shipping agricultural goods to and from the areas of the United States west of the Appalachian Mountains. Pinckney's Treaty, signed with Spain on October 27, 1795, gave American merchants "right of deposit" in New Orleans, granting them use of the port to store goods for export. Americans used this right to transport products such as flour, pork, lard, cider and cheese; the treaty recognized American rights to navigate the entire Mississippi, which had become vital to the growing trade of the western territories. In 1798, Spain revoked the treaty allowing American use of New Orleans upsetting Americans. In 1801, Spanish Governor Don Juan Manuel de Salcedo took over from the Marquess of Casa Calvo, restored the American right to deposit goods.
However, in 1800 Spain had ceded the Louisiana territory back to France as part of Napoleon's secret Third Treaty of San Ildefonso. The territory nominally remained under Spanish control, until a transfer of power to France on November 30, 1803, just three weeks before the formal cession of the territory to the United States on December 20, 1803. A further ceremony was held in Upper Louisiana regarding the New Orleans formalities; the March 9–10, 1804 event is remembered as Three Flags Day. James Monroe and Robert R. Livingston had traveled to Paris to negotiate the purchase of New Orleans in January 1803, their instructions were to purchase control of New Orleans and its environs. The Louisiana Purchase was by far the largest territorial gain in U. S. history. Stretching from the Mississippi River to the Rocky Mountains, the purchase doubled the size of the United States. Before 1803, Louisiana had been under Spanish control for forty years. Although Spain aided the rebels in the American Revolutionary War, the Spanish didn't want the Americans to settle in their territory.
Although the purchase was thought of by some as unjust and unconstitutional, Jefferson determined that his constitutional power to negotiate treaties allowed the purchase of what became fifteen states. In hindsight, the Louisiana Purchase could be considered one of his greatest contributions to the United States. On April 18, 1802, Jefferson penned a letter to United States Ambassador to France Robert Livingston, it was an intentional exhortation to make this mild diplomat warn the French of their perilous course. The letter began: The cession of Louisiana and the Floridas by Spain to France works most sorely on the U. S. On this subject the Secretary of State has written to you fully, yet I cannot forbear recurring to it s
Gold is a chemical element with symbol Au and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright reddish yellow, soft and ductile metal. Chemically, gold is a group 11 element, it is solid under standard conditions. Gold occurs in free elemental form, as nuggets or grains, in rocks, in veins, in alluvial deposits, it occurs in a solid solution series with the native element silver and naturally alloyed with copper and palladium. Less it occurs in minerals as gold compounds with tellurium. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of nitric acid and hydrochloric acid, which forms a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid, which dissolves silver and base metals, a property that has long been used to refine gold and to confirm the presence of gold in metallic objects, giving rise to the term acid test. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating.
Gold dissolves in mercury, forming amalgam alloys. A rare element, gold is a precious metal, used for coinage and other arts throughout recorded history. In the past, a gold standard was implemented as a monetary policy, but gold coins ceased to be minted as a circulating currency in the 1930s, the world gold standard was abandoned for a fiat currency system after 1971. A total of 186,700 tonnes of gold exists above ground, as of 2015; the world consumption of new gold produced is about 50% in jewelry, 40% in investments, 10% in industry. Gold's high malleability, resistance to corrosion and most other chemical reactions, conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices. Gold is used in infrared shielding, colored-glass production, gold leafing, tooth restoration. Certain gold salts are still used as anti-inflammatories in medicine; as of 2017, the world's largest gold producer by far was China with 440 tonnes per year.
Gold is the most malleable of all metals. It can be drawn into a monoatomic wire, stretched about twice before it breaks; such nanowires distort via formation and migration of dislocations and crystal twins without noticeable hardening. A single gram of gold can be beaten into a sheet of 1 square meter, an avoirdupois ounce into 300 square feet. Gold leaf can be beaten thin enough to become semi-transparent; the transmitted light appears greenish blue, because gold reflects yellow and red. Such semi-transparent sheets strongly reflect infrared light, making them useful as infrared shields in visors of heat-resistant suits, in sun-visors for spacesuits. Gold is a good conductor of electricity. Gold has a density of 19.3 g/cm3 identical to that of tungsten at 19.25 g/cm3. By comparison, the density of lead is 11.34 g/cm3, that of the densest element, osmium, is 22.588±0.015 g/cm3. Whereas most metals are gray or silvery white, gold is reddish-yellow; this color is determined by the frequency of plasma oscillations among the metal's valence electrons, in the ultraviolet range for most metals but in the visible range for gold due to relativistic effects affecting the orbitals around gold atoms.
Similar effects impart a golden hue to metallic caesium. Common colored gold alloys include the distinctive eighteen-karat rose gold created by the addition of copper. Alloys containing palladium or nickel are important in commercial jewelry as these produce white gold alloys. Fourteen-karat gold-copper alloy is nearly identical in color to certain bronze alloys, both may be used to produce police and other badges. White gold alloys can be made with nickel. Fourteen- and eighteen-karat gold alloys with silver alone appear greenish-yellow and are referred to as green gold. Blue gold can be made by alloying with iron, purple gold can be made by alloying with aluminium. Less addition of manganese, aluminium and other elements can produce more unusual colors of gold for various applications. Colloidal gold, used by electron-microscopists, is red. Gold has only one stable isotope, 197Au, its only occurring isotope, so gold is both a mononuclidic and monoisotopic element. Thirty-six radioisotopes have been synthesized, ranging in atomic mass from 169 to 205.
The most stable of these is 195Au with a half-life of 186.1 days. The least stable is 171Au. Most of gold's radioisotopes with atomic masses below 197 decay by some combination of proton emission, α decay, β+ decay; the exceptions are 195Au, which decays by electron capture, 196Au, which decays most by electron capture with a minor β− decay path. All of gold's radioisotopes with atomic masses above 197 decay by β− decay. At least 32 nuclear isomers have been characterized, ranging in atomic mass from 170 to 200. Within that range, only 178Au, 180Au, 181Au, 182Au, 188Au do not have isomers. Gold's most stable isomer is 198m2Au with a half-life of 2.27 days. Gold's least stable isomer is 177m2Au with a half-life of only 7 ns. 184m1Au has three decay paths: β+ decay, isomeric
United States Mint
The United States Mint is a unit of the Department of Treasury responsible for producing coinage for the United States to conduct its trade and commerce, as well as controlling the movement of bullion. It does not produce paper money; the Mint was created in Philadelphia in 1792, soon joined by other centers, whose coins were identified by their own mint marks. There are four active coin-producing mints: Philadelphia, San Francisco, West Point; the Mint was created by Congress with the Coinage Act of 1792, placed within the Department of State. Per the terms of the Coinage Act, the first Mint building was in Philadelphia, the capital of the United States. Today, the Mint's headquarters are in Washington D. C.. It operates mint facilities in Philadelphia, San Francisco, West Point, New York and a bullion depository at Fort Knox, Kentucky. Official Mints were once located in Carson City, Nevada. Part of the State Department, the Mint was made an independent agency in 1799, it converted precious metals into standard coin for anyone's account with no seigniorage charge beyond the refining costs.
Under the Coinage Act of 1873, the Mint became part of the Department of the Treasury. It was placed under the auspices of the Treasurer of the United States in 1981. Legal tender coins of today are minted for the Treasury's account; the first Director of the United States Mint was renowned scientist David Rittenhouse from 1792 to 1795. The position was held most by Edmund C. Moy until his resignation effective January 9, 2011; the position was left vacant until April 2018. Henry Voigt was the first Superintendent and Chief Coiner, is credited with some of the first U. S. coin designs. Another important position at the Mint is that of Chief Engraver, held by such men as Frank Gasparro, William Barber, Charles E. Barber, James B. Longacre, Christian Gobrecht; the Mint has operated several branch facilities throughout the United States since the Philadelphia Mint opened in 1792, in a building known as "Ye Olde Mint". With the opening of branch mints came the need for mint marks, an identifying feature on the coin to show its facility of origin.
The first of these branch mints were the Charlotte, North Carolina, Dahlonega and New Orleans, Louisiana branches. Both the Charlotte and Dahlonega Mints were opened to facilitate the conversion of local gold deposits into coinage, minted only gold coins; the Civil War closed both these facilities permanently. The New Orleans Mint closed at the beginning of the Civil War and did not re-open until the end of Reconstruction in 1879. During its two stints as a minting facility, it produced both gold and silver coinage in eleven different denominations, though only ten denominations were minted there at one time. A new branch facility was opened in Carson City, Nevada, in 1870. Like the Charlotte and Dahlonega branches, the Carson City Mint was opened to take advantage of local precious metal deposits, in this case, a large vein of silver. Though gold coins were produced there, no base metal coins were. In 1911 the Mint had a female acting director, Margaret Kelly, at that point the highest paid woman on the government's payroll.
She stated that women were paid within the bureau. A branch of the U. S. mint was established in 1920 in Manila in the Philippines, a U. S. territory. To date, the Manila Mint is the only U. S. mint established outside the continental U. S. and was responsible for producing coins. This branch was in production from 1920 to 1922, again from 1925 through 1941. Coins struck by this mint bear either the M mintmark or none at all, similar to the Philadelphia mint at the time. A branch mint in The Dalles, was commissioned in 1864. Construction was halted in 1870, the facility never produced any coins, although the building still stands. There are four active coin-producing mints: Philadelphia, San Francisco, West Point; the Mint's largest facility is the Philadelphia Mint. The current facility, which opened in 1969, is the fourth Philadelphia Mint; the first was built in 1792, when Philadelphia was still the U. S. capital, began operation in 1793. Until 1980, coins minted at Philadelphia bore no mint mark, with the exceptions of the Susan B.
Anthony dollar and the wartime Jefferson nickel. In 1980, the P mint mark was added to all U. S. coinage except the cent. Until 1968, the Philadelphia Mint was responsible for nearly all official proof coinage. Philadelphia is the site of master die production for U. S. coinage, the engraving and design departments of the Mint are located there. The Denver branch began life in 1863 as the local assay office, just five years after gold was discovered in the area. By the turn of the century, the office was bringing in over $5 million in annual gold and silver deposits, in 1906, the Mint opened its new Denver branch. Denver uses a D mint mark and strikes coinage only for circulation, although it did strike, along with three other mints, the $10 gold 1984 Los Angeles Olympic Com
The Washington quarter is the present quarter dollar or 25-cent piece issued by the United States Mint. The coin was first struck in 1932; as the United States prepared to celebrate the 1932 bicentennial of the birth of its first president, George Washington, members of the bicentennial committee established by Congress sought a Washington half dollar. They wanted to displace; the committee had engaged sculptor Laura Gardin Fraser to design a commemorative medal, wanted her to adapt her design for the quarter. Although Fraser's work was supported by the Commission of Fine Arts and its chairman, Charles W. Moore, Treasury Secretary Andrew W. Mellon chose a design by Flanagan, Mellon's successor, Ogden L. Mills, refused to disturb the decision; the new silver quarters entered circulation on August 1, 1932. A special reverse commemorating the United States Bicentennial was used in 1975 and 1976, with all pieces bearing the double date 1776–1976. Since 1999, the original eagle reverse has not been used.
The bust of Washington was made smaller beginning in 1999. On December 2, 1924, Congress created the United States George Washington Bicentennial Commission; the 200th anniversary of the birth of Washington, the first President of the United States, would occur in 1932, Congress wished to plan for the event well in advance. President Calvin Coolidge was ex officio chairman of the commission, which included government officials as well as prominent private citizens such as automobile manufacturer Henry Ford. In 1929, the Secretary of Commerce, Herbert Hoover, succeeded Coolidge both as president and in his commission role. By that time, the commission had become inactive, doing little after sending out an initial flurry of press releases. A new group, the George Washington Bicentennial Committee was established by Act of Congress in February 1930. Hoover was concerned about the large numbers of designs used for commemorative coins in the 1920s; when a commemorative coin bill was sent to him by Congress, Hoover vetoed it on April 21, 1930.
In a lengthy veto message delivered to Congress with the returned bill, Hoover noted his counterfeiting concerns, stated that the coins were selling badly anyway—large quantities of Oregon Trail Memorial half dollars remained unsold. The Bicentennial Committee wanted a commemorative Washington half dollar, sought to assuage Hoover's concerns by proposing that all 1932 half dollars depict Washington instead of bearing the usual Walking Liberty design; the Depression had decreased demand for coin in commerce. Most commemorative coins at the time were struck in a quantity of a few thousand; the half dollar was seen as the largest and most prominent design—the Peace dollar was not being struck and did not circulate in much of the country. Other commemoratives had been sold at a premium, the Washington half dollar would, for one year, be the normal Mint issue. Although it had not yet received congressional approval, the committee went ahead and began a competition; the committee anticipated that the same artist would first design the committee's medal and the coin.
The obverse of both medal and coin were to be based on the well-known sculpture of Washington by French sculptor Jean-Antoine Houdon. By law, coinage designs were approved by the Secretary of the Treasury, at that time Andrew W. Mellon, a noted art collector and connoisseur. After reviewing the entries, both the Bicentennial Committee and Fine Arts Commission agreed on designs by Laura Gardin Fraser; the wife of James Earle Fraser, designer of the Buffalo nickel, Laura Fraser was a notable coin designer in her own right, having designed several commemorative coins, including the Oregon Trail Memorial pieces. With a right-facing Washington, Fraser's designs were to be used for the medal, and, as those involved expected, the half dollar as well. On February 9, 1931, New Jersey Representative Randolph Perkins introduced legislation for a Washington quarter, to the dismay of the Bicentennial Committee and Fine Arts Commission; the House of Representatives Committee on Coinage and Measures issued a memorandum stating that the design of the existing Standing Liberty quarter had been found to be unsatisfactory, that the new piece would not only be struck for 1932, it would permanently replace the older design.
Thus, a new quarter would both be a tribute to Washington on his bicentennial, relieve the Mint of the burden of having to coin a difficult-to-strike piece. On February 12, Fine Arts Commission Chairman Charles W. Moore wrote to the House Committee, objecting to the change of denomination, proposing that they mandate that Laura Fraser's design for the medal appear on the coin. Moore was ignored, Congress passed authorizing legislation for a Washington quarter on March 4, 1931; the act provided that Washington's image, to appear on the obverse, was to be based on the "celebrated bust" of the
Presidential $1 Coin Program
The Presidential $1 Coin Program was the release by the United States Mint of $1 coins with engravings of relief portraits of U. S. presidents on the obverse and the Statue of Liberty on the reverse. From 2007 to 2011, presidential $1 coins were minted for circulation in large numbers, resulting in a large stockpile of unused $1 coins. From 2012 to 2016, new coins in the series were minted only for collectors. S. 1047, the Presidential $1 Coin Act of 2005, was introduced on May 17, 2005, by Senator John E. Sununu with over 70 co-sponsors, it was reported favorably out of the U. S. Senate Committee on Banking and Urban Affairs without amendment on July 29, 2005; the Senate passed it with a technical amendment, by unanimous consent on November 18, 2005. The House of Representatives passed it on December 13, 2005; the engrossed bill was presented to president George W. Bush on December 15, 2005, he signed it into law on December 22, 2005; the program began on January 1, 2007, like the 50 State Quarters program, was not scheduled to end until every eligible subject was honored.
The program was to issue coins featuring each of four presidents per year on the obverse, issuing one for three months before moving on to the next president in chronological order by term in office. To be eligible, a President must have been deceased for at least two years prior to the time of minting; the U. S. Mint called it the Presidential $1 Coin Program; the reverse of the coins bears the Statue of Liberty, the inscription "$1" and the inscription "United States of America". Inscribed along the edge of the coin is the year of minting or issuance of the coin, the mint mark, 13 stars, the legend E Pluribus Unum in the following arrangement: ★★★★★★★★★★ 2009 D ★★★ E PLURIBUS UNUM; the legend "Liberty" is absent from the coin altogether, since the decision was made that the image of the Statue of Liberty on the reverse of the coin was sufficient to convey the message of liberty. The text of the act does not specify the color of the coins, but per the U. S. Mint "the specifications will be identical to those used for the current Golden dollar".
The George Washington $1 coin was first available to the public on February 15, 2007, in honor of Presidents' Day, observed on February 19. This marked the first time since the St. Gaudens Double Eagle that the United States had issued a coin with edge lettering for circulation. Edge-lettered coins date back to the 1790s; the process was started to discourage the shaving of gold coin edges, a practice, used to cheat payees. In December 2007, Congress passed H. R. 2764, moving "In God We Trust" to either the reverse of the coins. This is the same bill that created a program that included quarters for Washington, D. C. Puerto Rico, Northern Mariana Islands, the U. S. Virgin Islands, American Samoa; the act had been introduced because of the failure of the Sacagawea $1 coin to gain widespread circulation in the United States. The act sympathized with the need of the nation's private sector for a $1 coin, expected that the appeal of changing the design would increase the public demand for new coins; the program was intended to help educate the public about the nation's presidents and their history.
In the event that the coins did not catch on with the general public, the Mint hoped that collectors would be as interested in the dollars as they were with the State Quarters, which generated about $4.6 billion in seigniorage between January 1999 and April 2005, according to a report by the Congressional Budget Office. Unlike the State Quarter program and the Westward Journey nickel series, which suspended the issuance of the current design during those programs, the act directed the Mint to continue to issue Sacagawea dollar coins during the presidential series; the law states. Furthermore, the Sacagawea design is required to continue; these requirements were added at the behest of the North Dakota congressional delegation to ensure that Sacagawea, whom North Dakotans consider to be one of their own remains on the dollar coin. However, Federal Reserve officials indicated to Congress that "if the Presidential $1 Coin Program does not stimulate substantial transactional demand for dollar coins, the requirement that the Mint nonetheless produce Sacagawea dollars would result in costs to the taxpayer without any offsetting benefits."
In that event, the Federal Reserve indicated that it would "strongly recommend that Congress reassess the one-third requirement." The one-third requirement was changed to one-fifth by the Native American $1 Coin Act, passed on September 20, 2007. Previous versions of the act called for removing from circulation dollar coins issued before the Sacagawea dollar, most notably the Susan B. Anthony dollar, but the version of the act which became law directs the Secretary of the Treasury to study the matter and report back to Congress; the act required federal government agencies, businesses operating on federal property, federally funded transit systems to accept and dispense dollar coins by January 2008, to post signs indicating that they do so. On March 8, 2007, the United States Mint announced, that on February 15, 2007, an unknown number of George Washington