SUPPORT THE WORK

GetWiki

gold

ARTICLE SUBJECTS
aesthetics  →
being  →
complexity  →
database  →
enterprise  →
ethics  →
fiction  →
history  →
internet  →
knowledge  →
language  →
licensing  →
linux  →
logic  →
method  →
news  →
perception  →
philosophy  →
policy  →
purpose  →
religion  →
science  →
sociology  →
software  →
truth  →
unix  →
wiki  →
ARTICLE TYPES
essay  →
feed  →
help  →
system  →
wiki  →
ARTICLE ORIGINS
critical  →
discussion  →
forked  →
imported  →
original  →
gold
[ temporary import ]
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
{{about|the element}}{{redirect|Element 79|the anthology|Element 79 (anthology)}}{{pp-vandalism|small=yes}}{{pp-move-indef}}{{short description|chemical element with atomic number 79}}{{Use dmy dates|date=May 2019}}







factoids
Gold is a chemical element with the symbol Au (from ) and atomic number 79, making it one of the higher atomic number elements that occur naturally. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. 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) form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum) and also naturally alloyed with copper and palladium. 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, 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 also dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction.A relatively rare element,BOOK, Routledge, Duckenfield, Mark, 2016, The Monetary History of Gold: A Documentary History, 1660–1999,weblink 4, Its scarcity makes it a useful store of value; however, its relative rarity reduced its utility as a currency, especially for transactions in small denominations., 9781315476124, BOOK, Smithsonian Books, Pearce, Susan M., 1993, Museums, Objects, and Collections: A Cultural Study,weblink 53, Its scarcity makes it a useful store of value; however, its relative rarity reduced its utility as a currency, especially for transactions in small denominations. ... Rarity is, nevertheless, in itself a source of value, and so is the degree of difficulty which surrounds the winning of the raw material, especially if it is exotic and has to be brought some distance. Gold is, geologically, a relatively rare material on earth and occurs only in specific places which are remote from most other places., 9781588345172, gold is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history. In the past, a gold standard was often implemented as a monetary policy, but gold coins ceased to be minted as a circulating currency in the 1930s, and 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|lc=y}}.WEB,weblink Gold supply, 26 December 2016, gold.org, The world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry.NEWS, Andy, Soos, Gold Mining Boom Increasing Mercury Pollution Risk, 6 January 2011, Oilprice.com,weblink Advanced Media Solutions, Inc., 26 March 2011, Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, colored-glass production, gold leafing, and 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.

Characteristics

(File:Au atomic wire.jpg|thumb|left|Gold can be drawn into a monoatomic wire, and then stretched more before it breaks.)File:Small gold nugget 5mm dia and corresponding foil surface of half sq meter.jpg|thumb|left|A gold nugget of {{convert|0.5|cm|abbr=on}} in size can be hammered into a 0.5|sqm|abbr=on}} area. Gold is the most malleable of all metals. It can be drawn into a monoatomic wire, and then stretched about twice before it breaks.BOOK, 10.5772/62288, 978-953-51-2252-4, Combined Transmission Electron Microscopy – In situ Observation of the Formation Process and Measurement of Physical Properties for Single Atomic-Sized Metallic Wires, Masuda, Hideki, Modern Electron Microscopy in Physical and Life Sciences, Janecek, Milos, Kral, Robert, InTech, 2016, Such nanowires distort via formation, reorientation and migration of dislocations and crystal twins without noticeable hardening.JOURNAL, 10.1080/14686996.2019.1585145, 30956731, 6442207, Synthesis and modelling of the mechanical properties of Ag, Au and Cu nanowires, Sci. Technol. Adv. Mater., 2019, 20, 1, 225–261, Che Lah, Nurul Akmal and Trigueros, Sonia, A single gram of gold can be beaten into a sheet of 1 square meter, and 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 strongly reflects yellow and red.WEB,weblink Gold: causes of color, 6 June 2009, Such semi-transparent sheets also strongly reflect infrared light, making them useful as infrared (radiant heat) shields in visors of heat-resistant suits, and in sun-visors for spacesuits.BOOK, Suiting up for space: the evolution of the space suit, Mallan, Lloyd, 1971, John Day Co., 978-0-381-98150-1, 216, Gold is a good conductor of heat and electricity.Gold has a density of 19.3 g/cm3, almost identical to that of tungsten at 19.25 g/cm3; as such, tungsten has been used in counterfeiting of gold bars, such as by plating a tungsten bar with gold,MAGAZINE,weblink How to Make Convincing Fake-Gold Bars, Gray, Theo, 14 March 2008, Popular Science, 18 June 2008, Willie, Jim (18 November 2009) "Zinc Dimes, Tungsten Gold & Lost Respect". KitcoWEB,weblink Largest Private Refinery Discovers Gold-Plated Tungsten Bar | Coin Update, news.coinupdate.com, NEWS, Reuters, Austrians Seize False Gold Tied to London Bullion Theft, The New York Times, 25 March 2012, 22 December 1983,weblink or taking an existing gold bar, drilling holes, and replacing the removed gold with tungsten rods.Tungsten filled Gold bars, ABC Bullion, Thursday, 22 March 2012 By comparison, the density of lead is 11.34 g/cm3, and that of the densest element, osmium, is {{val|22.588|0.015|u=g/cm3}}.JOURNAL, Arblaster, J. W., Osmium, the Densest Metal Known, Platinum Metals Review, 39, 4, 1995, 164,weblink

Color

File:Ag-Au-Cu-colours-english.svg|thumb|left|Different colors of Ag–Au–Cu alloys]]Whereas most metals are gray or silvery white, gold is slightly reddish-yellow.BOOK, Encyclopædia of Chemistry, Theoretical, Practical, and Analytical, as Applied to the Arts and Manufacturers: Glass-zinc,weblink 1880, J.B. Lippincott & Company, 70–, 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.WEB,weblink Relativity in Chemistry, Math.ucr.edu, 5 April 2009, JOURNAL, Hubert, Schmidbaur, Stephanie, Cronje, Bratislav, Djordjevic, Oliver, Schuster, Chemical Physics, 311, 151–161, Understanding gold chemistry through relativity, 10.1016/j.chemphys.2004.09.023, 2005, 1–2, 2005CP....311..151S, 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 also important in commercial jewelry as these produce white gold alloys. Fourteen-karat gold-copper alloy is nearly identical in color to certain bronze alloys, and both may be used to produce police and other badges. White gold alloys can be made with palladium or 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, and purple gold can be made by alloying with aluminium. Less commonly, addition of manganese, aluminium, indium and other elements can produce more unusual colors of gold for various applications.Colloidal gold, used by electron-microscopists, is red if the particles are small; larger particles of colloidal gold are blue.BOOK,weblink Electron Microscopy in Microbiology, 1988, Academic Press, 978-0-08-086049-7,

Isotopes

Gold has only one stable isotope, {{chem|197|Au}}, which is also its only naturally 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 {{chem|195|Au}} with a half-life of 186.1 days. The least stable is {{chem|171|Au}}, which decays by proton emission with a half-life of 30 µs. Most of gold's radioisotopes with atomic masses below 197 decay by some combination of proton emission, α decay, and β+ decay. The exceptions are {{chem|195|Au}}, which decays by electron capture, and {{chem|196|Au}}, which decays most often by electron capture (93%) with a minor β− decay path (7%).WEB,weblink National Nuclear Data Center, Nudat 2, 12 April 2012, All of gold's radioisotopes with atomic masses above 197 decay by β− decay.{{NUBASE 2003}}At least 32 nuclear isomers have also been characterized, ranging in atomic mass from 170 to 200. Within that range, only {{chem|178|Au}}, {{chem|180|Au}}, {{chem|181|Au}}, {{chem|182|Au}}, and {{chem|188|Au}} do not have isomers. Gold's most stable isomer is {{chem|198m2|Au}} with a half-life of 2.27 days. Gold's least stable isomer is {{chem|177m2|Au}} with a half-life of only 7 ns. {{chem|184m1|Au}} has three decay paths: β+ decay, isomeric transition, and alpha decay. No other isomer or isotope of gold has three decay paths.

Synthesis

The production of gold from a more common element, such as lead, has long been a subject of human inquiry, and the ancient and medieval discipline of alchemy often focused on it; however, the transmutation of the chemical elements did not become possible until the understanding of nuclear physics in the 20th century. The first synthesis of gold was conducted by Japanese physicist Hantaro Nagaoka, who synthesized gold from mercury in 1924 by neutron bombardment.JOURNAL, Miethe, A., Der Zerfall des Quecksilberatoms, 10.1007/BF01505547, Die Naturwissenschaften, 12, 29, 597–598, 1924, 1924NW.....12..597M, An American team, working without knowledge of Nagaoka's prior study, conducted the same experiment in 1941, achieving the same result and showing that the isotopes of gold produced by it were all radioactive.JOURNAL, Sherr, R., K. T., Bainbridge, H. H., Anderson, yes, Transmutation of Mercury by Fast Neutrons, 1941, Physical Review, 60, 7, 473–479, 10.1103/PhysRev.60.473, 1941PhRv...60..473S, Gold can currently be manufactured in a nuclear reactor by irradiation either of platinum or mercury.Only the mercury isotope 196Hg, which occurs with a frequency of 0.15% in natural mercury, can be converted to gold by neutron capture, and following electron capture-decay into 197Au with slow neutrons. Other mercury isotopes are converted when irradiated with slow neutrons into one another, or formed mercury isotopes which beta decay into thallium.Using fast neutrons, the mercury isotope 198Hg, which composes 9.97% of natural mercury, can be converted by splitting off a neutron and becoming 197Hg, which then disintegrates to stable gold. This reaction, however, possesses a smaller activation cross-section and is feasible only with un-moderated reactors.It is also possible to eject several neutrons with very high energy into the other mercury isotopes in order to form 197Hg. However, such high-energy neutrons can be produced only by particle accelerators.{{Clarify|reason=eject from what substance, and why can't this be done with a nuclear reactor?|date=March 2011}}{{clear}}

Chemistry

(File:Gold(III) chloride solution.jpg|thumb|right|Gold(III) chloride solution in water)Although gold is the most noble of the noble metals,JOURNAL, 10.1038/376238a0, Why gold is the noblest of all the metals, 1995, Hammer, B., Norskov, J. K., Nature, 376, 6537, 238–240, 1995Natur.376..238H, JOURNAL, 10.1103/PhysRevB.6.4370, Optical Constants of the Noble Metals, 1972, Johnson, P. B., Christy, R. W., Physical Review B, 6, 12, 4370–4379, 1972PhRvB...6.4370J, it still forms many diverse compounds. The oxidation state of gold in its compounds ranges from −1 to +5, but Au(I) and Au(III) dominate its chemistry. Au(I), referred to as the aurous ion, is the most common oxidation state with soft ligands such as thioethers, thiolates, and tertiary phosphines. Au(I) compounds are typically linear. A good example is Au(CN)2−, which is the soluble form of gold encountered in mining. The binary gold halides, such as AuCl, form zigzag polymeric chains, again featuring linear coordination at Au. Most drugs based on gold are Au(I) derivatives.JOURNAL, Shaw III, C. F., Gold-Based Medicinal Agents, Chemical Reviews, 1999, 99, 9, 2589–2600, 10.1021/cr980431o, 11749494, Au(III) (auric) is a common oxidation state, and is illustrated by gold(III) chloride, Au2Cl6. The gold atom centers in Au(III) complexes, like other d8 compounds, are typically square planar, with chemical bonds that have both covalent and ionic character.Gold does not react with oxygen at any temperatureWEB,weblink Chemistry of Oxygen, Chemwiki UC Davis, 1 May 2016, 2 October 2013, and, up to 100 Â°C, is resistant to attack from ozone.BOOK, Craig, B. D., Anderson, D. B., Handbook of Corrosion Data, 1995, ASM International, Materials Park, Ohio, 978-0-87170-518-1, 587, Some free halogens react with gold.BOOK, Wiberg, Egon, Wiberg, Nils, Holleman, Arnold Frederick, yes, 2001, Inorganic Chemistry, 101st, Academic Press, 978-0-12-352651-9, 1286, harv, Gold is strongly attacked by fluorine at dull-red heatBOOK,weblink Inorganic Chemistry, Wiberg, Egon, Wiberg, Nils, 2001, Academic Press, 978-0-12-352651-9, 404, to form gold(III) fluoride. Powdered gold reacts with chlorine at 180 Â°C to form AuCl3.{{harvnb|Wiberg|Wiberg|Holleman|2001|pp=1286–1287}} Gold reacts with bromine at 140 Â°C to form gold(III) bromide, but reacts only very slowly with iodine to form the monoiodide.Gold does not react with sulfur directly,WEB,weblink Wayback Machine, 10 November 2004, bot: unknown,weblink" title="web.archive.org/web/20041110193206weblink">weblink 10 November 2004, but gold(III) sulfide can be made by passing hydrogen sulfide through a dilute solution of gold(III) chloride or chlorauric acid.Gold readily dissolves in mercury at room temperature to form an amalgam, and forms alloys with many other metals at higher temperatures. These alloys can be produced to modify the hardness and other metallurgical properties, to control melting point or to create exotic colors.Gold is unaffected by most acids. It does not react with hydrofluoric, hydrochloric, hydrobromic, hydriodic, sulfuric, or nitric acid. It does react with selenic acid, and is dissolved by aqua regia, a 1:3 mixture of nitric acid and hydrochloric acid. Nitric acid oxidizes the metal to +3 ions, but only in minute amounts, typically undetectable in the pure acid because of the chemical equilibrium of the reaction. However, the ions are removed from the equilibrium by hydrochloric acid, forming AuCl4− ions, or chloroauric acid, thereby enabling further oxidation.Gold is similarly unaffected by most bases. It does not react with aqueous, solid, or molten sodium or potassium hydroxide. It does however, react with sodium or potassium cyanide under alkaline conditions when oxygen is present to form soluble complexes.Common oxidation states of gold include +1 (gold(I) or aurous compounds) and +3 (gold(III) or auric compounds). Gold ions in solution are readily reduced and precipitated as metal by adding any other metal as the reducing agent. The added metal is oxidized and dissolves, allowing the gold to be displaced from solution and be recovered as a solid precipitate.

Rare oxidation states

Less common oxidation states of gold include −1, +2, and +5.The −1 oxidation state occurs in aurides, compounds containing the Au− anion. Caesium auride (CsAu), for example, crystallizes in the caesium chloride motif;JOURNAL, Effects of relativistic motion of electrons on the chemistry of gold and platinum, Martin, Jansen, Solid State Sciences, 7, 12, 2005, 10.1016/j.solidstatesciences.2005.06.015, 1464–1474, 2005SSSci...7.1464J, rubidium, potassium, and tetramethylammonium aurides are also known.BOOK, Holleman, A. F., Wiberg, E., Inorganic Chemistry, Academic Press, San Diego, 2001, 978-0-12-352651-9, Gold has the highest electron affinity of any metal, at 222.8 kJ/mol, making Au− a stable species.JOURNAL, Jansen, Martin, The chemistry of gold as an anion, Chemical Society Reviews, 2008, 37, 9, 1826–1835, 10.1039/b708844m, 18762832, Gold(II) compounds are usually diamagnetic with Au–Au bonds such as [Au(CH2)2P(C6H5)2]2Cl2. The evaporation of a solution of {{chem|Au(OH)|3}} in concentrated {{chem|H|2|SO|4}} produces red crystals of gold(II) sulfate, Au2(SO4)2. Originally thought to be a mixed-valence compound, it has been shown to contain {{chem|Au|2|4+}} cations, analogous to the better-known mercury(I) ion, {{chem|Hg|2|2+}} .JOURNAL, Wickleder, Mathias S., 10.1002/1521-3749(200109)627:93.0.CO;2-2, 2001, AuSO4: A True Gold(II) Sulfate with an Au24+ Ion, Journal of Inorganic and General Chemistry, 627, 2112–2114, 9, BOOK, Wickleder, Mathias S., Handbook of chalcogen chemistry: new perspectives in sulfur, selenium and tellurium, Francesco A., Devillanova, Royal Society of Chemistry, 2007, 978-0-85404-366-8, 359–361,weblink A gold(II) complex, the tetraxenonogold(II) cation, which contains xenon as a ligand, occurs in [AuXe4](Sb2F11)2.JOURNAL, Seidel, S., Seppelt, K., Xenon as a Complex Ligand: The Tetra Xenono Gold(II) Cation in AuXe42+(Sb2F11−)2, Science, 2000, 290, 5489, 117–118, 10.1126/science.290.5489.117, 11021792, 2000Sci...290..117S, Gold pentafluoride, along with its derivative anion, {{chem|AuF|6|-}}, and its difluorine complex, gold heptafluoride, is the sole example of gold(V), the highest verified oxidation state.JOURNAL, Riedel, S., Kaupp, M., Revising the Highest Oxidation States of the 5d Elements: The Case of Iridium(+VII), Angewandte Chemie International Edition, 2006, 45, 22, 16639770, 3708–3711, 10.1002/anie.200600274, Some gold compounds exhibit aurophilic bonding, which describes the tendency of gold ions to interact at distances that are too long to be a conventional Au–Au bond but shorter than van der Waals bonding. The interaction is estimated to be comparable in strength to that of a hydrogen bond.Well-defined cluster compounds are numerous. In such cases, gold has a fractional oxidation state. A representative example is the octahedral species {Au(P(C6H5)3)}62+. Gold chalcogenides, such as gold sulfide, feature equal amounts of Au(I) and Au(III).

Medicinal uses

Medicinal applications of gold and its complexes have a long history dating back thousands of years.BOOK, Berners-Price, Susan J., 2011, 2011, Gold-Based Therapeutic Agents: A New Perspective, Alessio, E., Bioinorganic Medicinal Chemistry, Weinheim, Wiley-VCH Verlag GmbH, 2011, 197–221, 10.1002/9783527633104.ch7, 9783527633104, Several gold complexes have been applied to treat rheumatoid arthritis, the most frequently used being aurothiomalate, aurothioglucose, and auranofin. Both gold(I) and gold(III) compounds have been investigated as possible anti-cancer drugs. For gold(III) complexes, reduction to gold(0/I) under physiological conditions has to be considered. Stable complexes can be generated using different types of bi-, tri-, and tetradentate ligand systems, and their efficacy has been demonstrated in vitro and in vivo.BOOK, Casini, Angela, Angela Casini, Wai-Yin-Sun, Raymond, Ott, Ingo! Country !! 2009 !! 2010 !! 2011 !! 2012 !! 2013
editor1-first=Astrideditor2-first=Helmuteditor3-first=Evaeditor4-first=Roland K. O.journal=Metal Ions in Life Sciencesvolume= 18pmid=29394026pages=199–217, 9783110470734,

Celestial origin theories

File:Vredefort crater cross section 2.png|thumb|upright=1.8|Schematic of a NE (left) to SW (right) cross-section through the 2.020 billion year old Vredefort impact crater in South Africa and how it distorted the contemporary geological structures. The present erosion level is shown. Johannesburg is located where the Witwatersrand BasinWitwatersrand BasinGold is thought to have been produced in supernova nucleosynthesis, and from the collision of neutron stars,NEWS,weblink Earth's Gold Came from Colliding Dead Stars, David A. Aguilar & Christine Pulliam, cfa.harvard.edu, 17 July 2013, 18 February 2018, and to have been present in the dust from which the Solar System formed.JOURNAL, 10.1086/190111, Nucleosynthesis of Heavy Elements by Neutron Capture, 1965, Seeger, Philip A., Fowler, William A., Clayton, Donald D., The Astrophysical Journal Supplement Series, 11, 121, 1965ApJS...11..121S,weblink Because the Earth was molten when it was formed, almost all of the gold present in the early Earth probably sank into the planetary core. Therefore, most of the gold that is in the Earth's crust and mantle is thought to have been delivered to Earth later, by asteroid impacts during the Late Heavy Bombardment, about 4 billion years ago.JOURNAL, Elliott, Tim, Moorbath, Stephen, 2011, The tungsten isotopic composition of the Earth's mantle before the terminal bombardment, Nature, 477, 7363, 195–8, 2011Natur.477..195W, 10.1038/nature10399, 21901010, Willbold, Matthias, NEWS,weblink Meteorites delivered gold to Earth, Battison, Leila, 8 September 2011, BBC, In 2017, an international group of scientists, established that gold "came to the Earth's surface from the deepest regions of our planet,"WEB, University of Granada, Scientists reveals the mystery about the origin of gold, ScienceDaily, 21 November 2017, 27 March 2018,weblink Earth's mantle, evidenced by their findings at Deseado Massif in the Argentinian Patagonia.JOURNAL, Tassara, Santiago, González-Jiménez, José M., Reich, Martin, Schilling, Manuel E., Morata, Diego, Begg, Graham, Saunders, Edward, Griffin, William L., O’Reilly, Suzanne Y., Grégoire, Michel, Barra, Fernando, Corgne, Alexandre, Plume-subduction interaction forms large auriferous provinces, Nature Communications, 8, 1, 843, 2017, 2041-1723, 10.1038/s41467-017-00821-z, 29018198, 5634996, 2017NatCo...8..843T, {{clarify|reason=this directly contradicts the first paragraph of the next section|date=April 2019}}Traditionally, gold is thought to have formed by the r-process (rapid neutron capture) in supernova nucleosynthesis,WEB,weblink Supernovas & Supernova Remnants, Chandra X-ray Observatory, 28 February 2014, but more recently it has been suggested that gold and other elements heavier than iron may also be produced in quantity by the r-process in the collision of neutron stars.JOURNAL, Berger, E., W., Fong, R., Chornock, 2013, An r-process Kilonova Associated with the Short-hard GRB 130603B, The Astrophysical Journal Letters, 774, 2, 4, 10.1088/2041-8205/774/2/L23, 1306.3960, 2013ApJ...774L..23B, In both cases, satellite spectrometers only indirectly detected the resulting gold: "we have no spectroscopic evidence that [such] elements have truly been produced," wrote author Stephan Rosswog.JOURNAL, Rosswog, Stephan, 29 August 2013, Astrophysics: Radioactive glow as a smoking gun, Nature (journal), Nature, 500, 7464, 535–536, 10.1038/500535a, 2013Natur.500..535R, 23985867, However, in August 2017, the signatures of heavy elements, including gold, were observed by gravitational wave detectors and other electromagnetic observatories in the GW170817 neutron star merger event.NEWS, LIGO and Virgo make first detection of gravitational waves produced by colliding neutron stars,weblink LIGO & Virgo interferometer, Virgo collaborations, 16 October 2017, 15 February 2018, Current astrophysical models suggest that a single neutron star merger event generated between 3 and 13 Earth masses of gold.NEWS, Neutron star mergers may create much of the universe’s gold, Sid Perkins, Science AAAS,weblink 20 March 2018, 24 March 2018, The asteroid that formed Vredefort crater 2.020 billion years ago is often credited with seeding the Witwatersrand basin in South Africa with the richest gold deposits on earth.WEB,weblink Mangalisa Project, Superior Mining International Corporation, 29 December 2014, JOURNAL, Therriault, A. M., R. A. F., Grieve, W. U., Reimold, Original size of the Vredefort Structure: Implications for the geological evolution of the Witwatersrand Basin, Meteoritics, 32, 71–77, 1997, 1997M&PS...32...71T, yes, 10.1111/j.1945-5100.1997.tb01242.x, weblink" title="web.archive.org/web/20120327184158weblink">Meteor craters may hold untapped wealth. Cosmos Magazine (28 July 2008). Retrieved on 12 September 2013.JOURNAL, Corner, B., Durrheim, R. J., Nicolaysen, L. O., Relationships between the Vredefort structure and the Witwatersrand basin within the tectonic framework of the Kaapvaal craton as interpreted from regional gravity and aeromagnetic data, 10.1016/0040-1951(90)90089-Q, Tectonophysics, 171, 1, 49–61, 1990, 1990Tectp.171...49C, However, the gold-bearing Witwatersrand rocks were laid down between 700 and 950 million years before the Vredefort impact.McCarthy, T., Rubridge, B. (2005). The Story of Earth and Life. Struik Publishers, Cape Town. pp. 89–90, 102–107, 134–136. {{ISBN|1 77007 148 2}}Norman, N., Whitfield, G. (2006) Geological Journeys. Struik Publishers, Cape Town. pp. 38–49, 60–61. {{ISBN|9781770070622}} These gold-bearing rocks had furthermore been covered by a thick layer of Ventersdorp lavas and the Transvaal Supergroup of rocks before the meteor struck. What the Vredefort impact achieved, however, was to distort the Witwatersrand basin in such a way that the gold-bearing rocks were brought to the present erosion surface in Johannesburg, on the Witwatersrand, just inside the rim of the original 300 km diameter crater caused by the meteor strike. The discovery of the deposit in 1886 launched the Witwatersrand Gold Rush. Some 22% of all the gold that is ascertained to exist today on Earth has been extracted from these Witwatersrand rocks.

Occurrence

On Earth, gold is found in ores in rock formed from the Precambrian time onward. It most often occurs as a native metal, typically in a metal solid solution with silver (i.e. as a gold silver alloy). Such alloys usually have a silver content of 8–10%. Electrum is elemental gold with more than 20% silver. Electrum's color runs from golden-silvery to silvery, dependent upon the silver content. The more silver, the lower the specific gravity.Native gold occurs as very small to microscopic particles embedded in rock, often together with quartz or sulfide minerals such as "Fool's Gold", which is a pyrite.WEB,weblink Formation of Lode Gold Deposits, Heike, Brian, bot: unknown,weblink" title="web.archive.org/web/20130122100747weblink">weblink 22 January 2013, Arizona Gold Prospectors, These are called lode deposits. The metal in a native state is also found in the form of free flakes, grains or larger nuggets that have been eroded from rocks and end up in alluvial deposits called placer deposits. Such free gold is always richer at the surface of gold-bearing veins{{clarify| reason = Richer than where? Than deeper in the veins? Than in some other place on the surface?|date=May 2012}} owing to the oxidation of accompanying minerals followed by weathering, and washing of the dust into streams and rivers, where it collects and can be welded by water action to form nuggets.Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite (see telluride minerals), and as the rare bismuthide maldonite (Au2Bi) and antimonide aurostibite (AuSb2). Gold also occurs in rare alloys with copper, lead, and mercury: the minerals auricupride (Cu3Au), novodneprite (AuPb3) and weishanite ((Au, Ag)3Hg2).Recent research suggests that microbes can sometimes play an important role in forming gold deposits, transporting and precipitating gold to form grains and nuggets that collect in alluvial deposits.WEB,weblink Environment & Nature News â€“ Bugs grow gold that looks like coral, 28 January 2004, 22 July 2006, abc.net.au, This is doctoral research undertaken by Frank Reith at the Australian National University, published 2004.Another recent study has claimed water in faults vaporizes during an earthquake, depositing gold. When an earthquake strikes, it moves along a fault. Water often lubricates faults, filling in fractures and jogs. About 6 miles (10 kilometers) below the surface, under incredible temperatures and pressures, the water carries high concentrations of carbon dioxide, silica, and gold. During an earthquake, the fault jog suddenly opens wider. The water inside the void instantly vaporizes, flashing to steam and forcing silica, which forms the mineral quartz, and gold out of the fluids and onto nearby surfaces.WEB,weblink Earthquakes Turn Water into Gold|18 March 2013, 18 March 2013,

Seawater

The world's oceans contain gold. Measured concentrations of gold in the Atlantic and Northeast Pacific are 50–150 femtomol/L or 10–30 parts per quadrillion (about 10–30 g/km3). In general, gold concentrations for south Atlantic and central Pacific samples are the same (~50 femtomol/L) but less certain. Mediterranean deep waters contain slightly higher concentrations of gold (100–150 femtomol/L) attributed to wind-blown dust and/or rivers. At 10 parts per quadrillion the Earth's oceans would hold 15,000 tonnes of gold.JOURNAL, 10.1016/0012-821X(90)90060-B, Gold in seawater, K., Kenison Falkner, Earth and Planetary Science Letters, 98, 1990, 208–221, Edmond, J., 2, 1990E&PSL..98..208K, These figures are three orders of magnitude less than reported in the literature prior to 1988, indicating contamination problems with the earlier data.A number of people have claimed to be able to economically recover gold from sea water, but they were either mistaken or acted in an intentional deception. Prescott Jernegan ran a gold-from-seawater swindle in the United States in the 1890s, as did an English fraudster in the early 1900s.Plazak, Dan A Hole in the Ground with a Liar at the Top (Salt Lake: Univ. of Utah Press, 2006) {{ISBN|0-87480-840-5}} (contains a chapter on gold-from seawater swindles) Fritz Haber did research on the extraction of gold from sea water in an effort to help pay Germany's reparations following World War I.JOURNAL, Das Gold im Meerwasser, F., Haber, 40, 11, 1927, 10.1002/ange.19270401103, 303–314, Zeitschrift für Angewandte Chemie, Based on the published values of 2 to 64 ppb of gold in seawater a commercially successful extraction seemed possible. After analysis of 4,000 water samples yielding an average of 0.004 ppb it became clear that extraction would not be possible and he stopped the project.JOURNAL, 10.1016/0375-6742(88)90051-9, Concentration of gold in natural waters, J. B., McHugh, Journal of Geochemical Exploration, 30, 1988, 85–94, 1–3,weblink

History

File:Indian gold tribute donor Apadana.jpg|thumb|upright|An Indian tribute-bearer at Apadana, from the Achaemenid satrapy of HindushHindushFile:Gold Museum, Bogota (36145671394).jpg|thumb|right|Muisca raft, between circa 600-1600 AD. The figure refers to the ceremony of the legend of El Dorado. The zipa used to cover his body in gold dust, and from his raft, he offered treasures to the Guatavita goddess in the middle of the sacred lake. This old Muisca tradition became the origin of the legend of El Dorado.This Muisca raft figure is on display in the Gold Museum, BogotáGold Museum, BogotáThe earliest recorded metal employed by humans appears to be gold, which can be found free or "native". Small amounts of natural gold have been found in Spanish caves used during the late Paleolithic period, c. 40,000 BC.WEB,weblink History of Gold, Gold Digest, 2007-02-04, Gold artifacts made their first appearance at the very beginning of the pre-dynastic period in Egypt, at the end of the fifth millennium BC and the start of the fourth, and smelting was developed during the course of the 4th millennium; gold artifacts appear in the archeology of Lower Mesopotamia during the early 4th millennium.Sutherland, C.H.V, Gold (London, Thames & Hudson, 1959) p 27 ff. Gold artifacts in the Balkans appear from the 4th millennium BC, such as those found in the Varna Necropolis near Lake Varna in Bulgaria, thought by one source (La Niece 2009) to be the earliest "well-dated" find of gold artifacts.BOOK, La Niece, Susan (senior metallurgist in the British Museum Department of Conservation and Scientific Research),weblink Gold, 10, Harvard University Press, 10 April 2012, 978-0-674-03590-4, 15 December 2009, As of 1990, gold artifacts found at the Nahal Qana cave cemetery of the 4th millennium BC in Palestine (occupied West Bank) were the earliest from the Levant.JOURNAL, Gopher, A., T., Tsuk, S., Shalev, R., Gophna, yes, Earliest Gold Artifacts in the Levant, August–October 1990, Current Anthropology, 31, 4, 436–443, 2743275, 10.1086/203868, Gold artifacts such as the golden hats and the Nebra disk appeared in Central Europe from the 2nd millennium BC Bronze Age.The oldest known map of a gold mine was drawn in the 19th Dynasty of Ancient Egypt (1320–1200 BC), whereas the first written reference to gold was recorded in the 12th Dynasty around 1900 BC.Pohl, Walter L. (2011) Economic Geology Principles and Practice. Wiley. p. 208. {{DOI|10.1002/9781444394870.ch2}}. {{ISBN|9781444394870 }} Egyptian hieroglyphs from as early as 2600 BC describe gold, which King Tushratta of the Mitanni claimed was "more plentiful than dirt" in Egypt.BOOK, Montserrat, Dominic,weblink Akhenaten: History, Fantasy and Ancient Egypt, 978-0-415-30186-2, 21 February 2003, Egypt and especially Nubia had the resources to make them major gold-producing areas for much of history. One of the earliest known maps, known as the Turin Papyrus Map, shows the plan of a gold mine in Nubia together with indications of the local geology. The primitive working methods are described by both Strabo and Diodorus Siculus, and included fire-setting. Large mines were also present across the Red Sea in what is now Saudi Arabia.File:Golden crown Armento Staatliche Antikensammlungen 01.jpg|thumb|left|Ancient golden Kritonios Crown, funerary or marriage material, 370–360 BC. From a grave in Armento, CampaniaCampaniaGold is mentioned in the Amarna letters numbered 19Moran, William L., 1987, 1992. The Amarna Letters, pp. 43–46. and 26Moran, William L. 1987, 1992. The Amarna Letters. EA 245, "To the Queen Mother: Some Missing Gold Statues", pp. 84–86. from around the 14th century BC."Akhenaten". Encyclopaedia BritannicaDodson, Aidan and Hilton, Dyan (2004). The Complete Royal Families of Ancient Egypt. Thames & Hudson. {{ISBN|0-500-05128-3}}Gold is mentioned frequently in the Old Testament, starting with Genesis 2:11 (at Havilah), the story of the golden calf, and many parts of the temple including the Menorah and the golden altar. In the New Testament, it is included with the gifts of the magi in the first chapters of Matthew. The Book of Revelation 21:21 describes the city of New Jerusalem as having streets "made of pure gold, clear as crystal". Exploitation of gold in the south-east corner of the Black Sea is said to date from the time of Midas, and this gold was important in the establishment of what is probably the world's earliest coinage in Lydia around 610 BC. The legend of the golden fleece dating from eighth century BCE may refer to the use of fleeces to trap gold dust from placer deposits in the ancient world. From the 6th or 5th century BC, the Chu (state) circulated the Ying Yuan, one kind of square gold coin.In Roman metallurgy, new methods for extracting gold on a large scale were developed by introducing hydraulic mining methods, especially in Hispania from 25 BC onwards and in Dacia from 106 AD onwards. One of their largest mines was at Las Medulas in León, where seven long aqueducts enabled them to sluice most of a large alluvial deposit. The mines at RoÅŸia Montană in Transylvania were also very large, and until very recently, still mined by opencast methods. They also exploited smaller deposits in Britain, such as placer and hard-rock deposits at Dolaucothi. The various methods they used are well described by Pliny the Elder in his encyclopedia Naturalis Historia written towards the end of the first century AD.During Mansa Musa's (ruler of the Mali Empire from 1312 to 1337) hajj to Mecca in 1324, he passed through Cairo in July 1324, and was reportedly accompanied by a camel train that included thousands of people and nearly a hundred camels where he gave away so much gold that it depressed the price in Egypt for over a decade, causing high inflation.weblink" title="web.archive.org/web/20060524015912weblink">Mansa Musa. Black History Pages A contemporary Arab historian remarked:}}File:Monnaie de Bactriane, Eucratide I, 2 faces.jpg|thumb|Gold coin of Eucratides I (171–145 BC), one of the Hellenistic rulers of ancient (Ai-Khanoum]]. This is the largest known gold coin minted in antiquity (169,20 g; 58 mm).BOOK, Monnaie, Eucratide I. (roi de Bactriane) Autorité émettrice de, [Monnaie : 20 Statères, Or, Incertain, Bactriane, Eucratide I],weblink )The European exploration of the Americas was fueled in no small part by reports of the gold ornaments displayed in great profusion by Native American peoples, especially in Mesoamerica, Peru, Ecuador and Colombia. The Aztecs regarded gold as the product of the gods, calling it literally "god excrement" (teocuitlatl in Nahuatl), and after Moctezuma II was killed, most of this gold was shipped to Spain.BOOK, Frances, Berdan, Patricia Rieff, Anawalt, The Codex Mendoza, 2, 151, University of California Press, 1992, 978-0-520-06234-4, However, for the indigenous peoples of North America gold was considered useless and they saw much greater value in other minerals which were directly related to their utility, such as obsidian, flint, and slate.weblink" title="web.archive.org/web/20120112010110weblink">Sierra Nevada Virtual Museum. Sierra Nevada Virtual Museum. Retrieved on 4 May 2012. El Dorado is applied to a legendary story in which precious stones were found in fabulous abundance along with gold coins. The concept of El Dorado underwent several transformations, and eventually accounts of the previous myth were also combined with those of a legendary lost city. El Dorado, was the term used by the Spanish Empire to describe a mythical tribal chief (zipa) of the Muisca native people in Colombia, who, as an initiation rite, covered himself with gold dust and submerged in Lake Guatavita. The legends surrounding El Dorado changed over time, as it went from being a man, to a city, to a kingdom, and then finally to an empire.Gold played a role in western culture, as a cause for desire and of corruption, as told in children's fables such as Rumpelstiltskin—where Rumpelstiltskin turns hay into gold for the peasant's daughter in return for her child when she becomes a princess—and the stealing of the hen that lays golden eggs in Jack and the Beanstalk.The top prize at the Olympic Games and many other sports competitions is the gold medal.75% of the presently accounted for gold has been extracted since 1910. It has been estimated that the currently known amount of gold internationally would form a single cube 20 m (66 ft) on a side (equivalent to 8,000 m3).WEB,weblink Yearly Gold Production in metric tonnes (1900–2004), Goldsheet Mining Directory,weblink" title="web.archive.org/web/20060612223615weblink">weblink 12 June 2006, 22 July 2006, One main goal of the alchemists was to produce gold from other substances, such as lead â€” presumably by the interaction with a mythical substance called the philosopher's stone. Although they never succeeded in this attempt, the alchemists did promote an interest in systematically finding out what can be done with substances, and this laid the foundation for today's chemistry. Their symbol for gold was the circle with a point at its center (☉), which was also the astrological symbol and the ancient Chinese character for the Sun.The Dome of the Rock is covered with an ultra-thin golden glassier. The Sikh Golden temple, the Harmandir Sahib, is a building covered with gold. Similarly the Wat Phra Kaew emerald Buddhist temple (wat) in Thailand has ornamental gold-leafed statues and roofs. Some European king and queen's crowns were made of gold, and gold was used for the bridal crown since antiquity. An ancient Talmudic text circa 100 AD describes Rachel, wife of Rabbi Akiva, receiving a "Jerusalem of Gold" (diadem). A Greek burial crown made of gold was found in a grave circa 370 BC.

Etymology

File:Beowulf - gold.jpg|thumb|An early mention of gold in the BeowulfBeowulf"Gold" is cognate with similar words in many Germanic languages, deriving via Proto-Germanic (wikt:Appendix:Proto-Germanic/gulþą|*gulþą) from Proto-Indo-European (wikt:Appendix:Proto-Indo-European/ǵʰelh₃-|*ǵʰelh₃-) ("to shine, to gleam; to be yellow or green").{{OEtymD|gold}}Hesse, R W. (2007) Jewelrymaking Through History: An Encyclopedia, Greenwood Publishing Group. {{ISBN|0313335079}}The symbol Au is from the , the Latin word for "gold".Notre Dame University Latin Dictionary Retrieved 7 June 2012 The Proto-Indo-European ancestor of aurum was *h₂é-hâ‚‚us-o-, meaning "glow". This word is derived from the same root (Proto-Indo-European *hâ‚‚u̯es- "to dawn") as (wikt:Appendix:Proto-Indo-European/h₂éwsōs|*h₂éu̯sōs), the ancestor of the Latin word Aurora, "dawn".BOOK, de Vaan, Michel, Etymological Dictionary of Latin and the other Italic languages, 2008, Brill, Leiden: Boston, 978-90-04-16797-1, 63, This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant "shining dawn".Christie, A and Brathwaite, R. (Last updated 2 November 2011) weblink" title="web.archive.org/web/20130208092020weblink">Mineral Commodity Report 14 — Gold, Institute of geological and Nuclear sciences Ltd â€“ Retrieved 7 June 2012

Culture

{{more citations needed section|small=yes|date=February 2014}}Outside chemistry, gold is mentioned in a variety of expressions, most often associated with intrinsic worth. Great human achievements are frequently rewarded with gold, in the form of gold medals, gold trophies and other decorations. Winners of athletic events and other graded competitions are usually awarded a gold medal. Many awards such as the Nobel Prize are made from gold as well. Other award statues and prizes are depicted in gold or are gold plated (such as the Academy Awards, the Golden Globe Awards, the Emmy Awards, the Palme d'Or, and the British Academy Film Awards).Aristotle in his ethics used gold symbolism when referring to what is now known as the golden mean. Similarly, gold is associated with perfect or divine principles, such as in the case of the golden ratio and the golden rule.Gold is further associated with the wisdom of aging and fruition. The fiftieth wedding anniversary is golden. A person's most valued or most successful latter years are sometimes considered "golden years". The height of a civilization is referred to as a golden age.In some forms of Christianity and Judaism, gold has been associated both with holiness and evil. In the Book of Exodus, the Golden Calf is a symbol of idolatry, while in the Book of Genesis, Abraham was said to be rich in gold and silver, and Moses was instructed to cover the Mercy Seat of the Ark of the Covenant with pure gold. In Byzantine iconography the halos of Christ, Mary and the Christian saints are often golden.According to Christopher Columbus, those who had something of gold were in possession of something of great value on Earth and a substance to even help souls to paradise.BOOK, Bernstein, Peter L.,weblink The Power of Gold: The History of an Obsession, 2004, John Wiley & Sons, 978-0-471-43659-1, 1, Wedding rings are typically made of gold. It is long lasting and unaffected by the passage of time and may aid in the ring symbolism of eternal vows before God and the perfection the marriage signifies. In Orthodox Christian wedding ceremonies, the wedded couple is adorned with a golden crown (though some opt for wreaths, instead) during the ceremony, an amalgamation of symbolic rites.

Production

(File:Gold - world production trend.svg|thumb|lang=en|Time trend of gold production)The World Gold Council states that as of the end of 2017, "there were 187,200 tonnes of stocks in existence above ground". This can be represented by a cube with an edge length of about 21 meters.WEB,weblink Gold Supply – Mining & Recycling, World Gold Council, At $1,349 per troy ounce, 187,200 metric tonnes of gold would have a value of $8.9 trillion. According to the United States Geological Survey in 2016, about {{convert|5,726,000,000|ozt|t}} of gold has been produced since the beginning of civilization, of which 85% remains in use.REPORT, John L., Munteen, David A., Davis, Bridget, Ayling, 2017, The Nevada Mineral Industry 2016,weblink University of Nevada, Reno, 9 February 2019, 1061602920, In 2017, the world's largest gold producer by far was China with 440 tonnes. The second-largest producer, Australia, mined 300 tonnes in the same year, followed by Russia with 255 tonnes.

Mining and prospecting

File:Miner underground at Pumsaint gold mine (1294028).jpg|thumb|A miner underground at Pumsaint gold mine, WalesWalesSince the 1880s, South Africa has been the source of a large proportion of the world's gold supply, and about 22% of the gold presently accounted is from South Africa. Production in 1970 accounted for 79% of the world supply, about 1,480 tonnes. In 2007 China (with 276 tonnes) overtook South Africa as the world's largest gold producer, the first time since 1905 that South Africa has not been the largest.WEB, Mandaro, Laura,weblink China now world's largest gold producer; foreign miners at door, MarketWatch, 17 January 2008, 5 April 2009, {{as of|2017}}, China was the world's leading gold-mining country, followed in order by Australia, Russia, the United States, Canada, and Peru. South Africa, which had dominated world gold production for most of the 20th century, had declined to sixth place.WEB,weblink Gold, U.S. Geological Survey, Mineral Commodity Summaries, 2018, Other major producers are the Ghana, Burkina Faso, Mali, Indonesia and Uzbekistan.File:Gold 30g for a 860kg rock.jpg|thumb|Relative sizes of an 860 kg block of gold ore, and the 30 g of gold that can be extracted from it. Toi gold mine, JapanJapanIn South America, the controversial project Pascua Lama aims at exploitation of rich fields in the high mountains of Atacama Desert, at the border between Chile and Argentina.Today about one-quarter of the world gold output is estimated to originate from artisanal or small scale mining.JOURNAL, Removal of Barriers to the Abatement of Global Mercury Pollution from Artisanal Gold Mining,weblink Beinhoff, Christian, 29 December 2014, dead,weblink" title="web.archive.org/web/20160126032505weblink">weblink 26 January 2016, The city of Johannesburg located in South Africa was founded as a result of the Witwatersrand Gold Rush which resulted in the discovery of some of the largest natural gold deposits in recorded history. The gold fields are confined to the northern and north-western edges of the Witwatersrand basin, which is a 5–7 km thick layer of archean rocks located, in most places, deep under the Free State, Gauteng and surrounding provinces.Truswell, J.F. (1977). The Geological Evolution of South Africa. pp. 21–28. Purnell, Cape Town. {{ISBN|9780360002906}} These Witwatersrand rocks are exposed at the surface on the Witwatersrand, in and around Johannesburg, but also in isolated patches to the south-east and south-west of Johannesburg, as well as in an arc around the Vredefort Dome which lies close to the center of the Witwatersrand basin. From these surface exposures the basin dips extensively, requiring some of the mining to occur at depths of nearly 4000 m, making them, especially the Savuka and TauTona mines to the south-west of Johannesburg, the deepest mines on earth. The gold is found only in six areas where archean rivers from the north and north-west formed extensive pebbly Braided river deltas before draining into the "Witwatersrand sea" where the rest of the Witwatersrand sediments were deposited.The Second Boer War of 1899–1901 between the British Empire and the Afrikaner Boers was at least partly over the rights of miners and possession of the gold wealth in South Africa.During the 19th century, gold rushes occurred whenever large gold deposits were discovered. The first documented discovery of gold in the United States was at the Reed Gold Mine near Georgeville, North Carolina in 1803.WEB,weblink" title="web.archive.org/web/20120115012324weblink">weblink Reed Gold Mine State Historic Site, Moore, Mark A., 2006, North Carolina Office of Archives and History, 13 December 2008, The first major gold strike in the United States occurred in a small north Georgia town called Dahlonega.WEB, Road to adventure, Georgia Magazine, Garvey, Jane A.,weblink 2006, 23 January 2007, dead,weblink" title="web.archive.org/web/20070302212304weblink">weblink 2 March 2007, Further gold rushes occurred in California, Colorado, the Black Hills, Otago in New Zealand, Australia, Witwatersrand in South Africa, and the Klondike in Canada.

Extraction and refining {| style" text-align:right;float:right" class"wikitable sortable"

weblink" title="web.archive.org/web/20120112003914weblink">weblink 12 January 2012, Gold jewellery consumption by country, 28 February 2011, Reuters, WEB,weblink Gold Demand Trends | Investment | World Gold Council, Gold.org, 12 September 2013, WEB,weblink Gold Demand Trends, 12 November 2015,
{{flag| 974
{{flag| 1120.1
{{flag| 190
{{flag| 175.2
{{flag| 72.2
{{flag| 73.3
{{flag| 77.1
{{flag| 57.3
{{flag| 68
{{flag| 23.4
Other Persian Gulf Countries 24.10 21.97 22 19.9 24.6
{{flag| 21.3
{{flag| 17.5
{{flag| 92.2
{{flag| 140.1
Total 1508.70 1805.60
Other Countries 251.6 254.0 390.4 393.5 450.7
World Total 1760.3 2059.6 3487.5 3163.6 3863.5
Gold extraction is most economical in large, easily mined deposits. Ore grades as little as 0.5 parts per million (ppm) can be economical. Typical ore grades in open-pit mines are 1–5 ppm; ore grades in underground or hard rock mines are usually at least 3 ppm. Because ore grades of 30 ppm are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.The average gold mining and extraction costs were about $317 per troy ounce in 2007, but these can vary widely depending on mining type and ore quality; global mine production amounted to 2,471.1 tonnes.NEWS, O'Connell, Rhona, 13 April 2007, Gold mine production costs up by 17% in 2006 while output fell,weblink dead,weblink" title="web.archive.org/web/20141006084904weblink">weblink 6 October 2014, After initial production, gold is often subsequently refined industrially by the Wohlwill process which is based on electrolysis or by the Miller process, that is chlorination in the melt. The Wohlwill process results in higher purity, but is more complex and is only applied in small-scale installations.BOOK, Noyes, Robert,weblink 342, Pollution prevention technology handbook, William Andrew, 1993, 978-0-8155-1311-7, BOOK, Pletcher, Derek, Frank, Walsh,weblink 244, Industrial electrochemistry, yes, Springer, 1990, 978-0-412-30410-1, Other methods of assaying and purifying smaller amounts of gold include parting and inquartation as well as cupellation, or refining methods based on the dissolution of gold in aqua regia.BOOK, Marczenko, Zygmunt, María, Balcerzak,weblink 210, Separation, preconcentration, and spectrophotometry in inorganic analysis, yes, Elsevier, 2000, 978-0-444-50524-8,

Consumption

The consumption of gold produced in the world is about 50% in jewelry, 40% in investments, and 10% in industry.WEB,weblink Country wise gold demand, 2 October 2015, According to World Gold Council, China is the world's largest single consumer of gold in 2013 and toppled India for the first time with Chinese consumption increasing by 32 percent in a year, while that of India only rose by 13 percent and world consumption rose by 21 percent. Unlike India where gold is mainly used for jewelry, China uses gold for manufacturing and retail.WEB, Harjani, Ansuya,weblink It's official: China overtakes India as top consumer of gold, 2 July 2014, 18 February 2014,

Pollution

{{further|Mercury cycle|International Cyanide Management Code}}Gold production is associated with contribution to hazardous pollution.JOURNAL, Ameer, Marikar, Fouzul, Abdul-Wahab, Sabah Ahmed, The environmental impact of gold mines: pollution by heavy metals, Central European Journal of Engineering, 24 October 2011, 2, 2, 304–313, 10.2478/s13531-011-0052-3, 2012CEJE....2..304A, Summit declaration, Peoples' Gold summit, San Juan Ridge, California in June 1999. Scribd.com (22 February 2012). Retrieved on 4 May 2012.Low-grade gold ore may contain less than one ppm gold metal; such ore is ground and mixed with sodium cyanide to dissolve the gold. Cyanide is a highly poisonous chemical, which can kill living creatures when exposed in minute quantities. Many cyanide spillsCyanide spills from gold mine compared to Chernobyls nuclear disaster. Deseretnews.com (14 February 2000). Retrieved on 4 May 2012. from gold mines have occurred in both developed and developing countries which killed aquatic life in long stretches of affected rivers. Environmentalists consider these events major environmental disasters.Death of a river. BBC News (15 February 2000). Retrieved on 4 May 2012.Cyanide spill second only to Chernobyl. Abc.net.au. 11 February 2000. Retrieved on 4 May 2012. Thirty tons of used ore is dumped as waste for producing one troy ounce of gold.Behind gold's glitter, torn lands and pointed questions, New York Times, 24 October 2005 Gold ore dumps are the source of many heavy elements such as cadmium, lead, zinc, copper, arsenic, selenium and mercury. When sulfide-bearing minerals in these ore dumps are exposed to air and water, the sulfide transforms into sulfuric acid which in turn dissolves these heavy metals facilitating their passage into surface water and ground water. This process is called acid mine drainage. These gold ore dumps are long term, highly hazardous wastes second only to nuclear waste dumps.It was once common to use mercury to recover gold from ore, but today the use of mercury is largely limited to small-scale individual miners.WEB,weblink Pollution from Artisanal Gold Mining, Blacksmith Institute Report 2012, 22 September 2015, Minute quantities of mercury compounds can reach water bodies, causing heavy metal contamination. Mercury can then enter into the human food chain in the form of methylmercury. Mercury poisoning in humans causes incurable brain function damage and severe retardation.Gold extraction is also a highly energy intensive industry, extracting ore from deep mines and grinding the large quantity of ore for further chemical extraction requires nearly 25 kWh of electricity per gram of gold produced.JOURNAL, 10.1016/j.jclepro.2012.01.042, Using life cycle assessment to evaluate some environmental impacts of gold, 2012, Norgate, Terry, Haque, Nawshad, Journal of Cleaner Production, 29–30, 53–63,

Monetary use

File:Two 20kr gold coins.png|thumb|right|Two golden 20 kr coins from the Scandinavian Monetary Union, which was based on a gold standard. The coin to the left is Swedish and the right one is Danish.]]Gold has been widely used throughout the world as money,BOOK,weblink Man, Economy, and State, Scholar's Edition, Rothbard, Murray N., 2009, Ludwig von Mises Institute, 978-1-933550-99-2, for efficient indirect exchange (versus barter), and to store wealth in hoards. For exchange purposes, mints produce standardized gold bullion coins, bars and other units of fixed weight and purity.The first known coins containing gold were struck in Lydia, Asia Minor, around 600 BC.WEB,weblink A Case for the World's Oldest Coin: Lydian Lion, Rg.ancients.info, 2 October 2003, 27 October 2013, The talent coin of gold in use during the periods of Grecian history both before and during the time of the life of Homer weighed between 8.42 and 8.75 grams.BOOK, Seltman, C. T.,weblink Athens, Its History and Coinage Before the Persian Invasion, 4 June 2012, 978-0-87184-308-1, 1924, From an earlier preference in using silver, European economies re-established the minting of gold as coinage during the thirteenth and fourteenth centuries.BOOK, Postan, M. M., Miller, E.,weblink The Cambridge Economic History of Europe: Trade and industry in the Middle Ages, Cambridge University Press, 28 August 1987, 978-0-521-08709-4, 1967, Bills (that mature into gold coin) and gold certificates (convertible into gold coin at the issuing bank) added to the circulating stock of gold standard money in most 19th century industrial economies.In preparation for World War I the warring nations moved to fractional gold standards, inflating their currencies to finance the war effort.Post-war, the victorious countries, most notably Britain, gradually restored gold-convertibility, but international flows of gold via bills of exchange remained embargoed; international shipments were made exclusively for bilateral trades or to pay war reparations.After World War II gold was replaced by a system of nominally convertible currencies related by fixed exchange rates following the Bretton Woods system. Gold standards and the direct convertibility of currencies to gold have been abandoned by world governments, led in 1971 by the United States' refusal to redeem its dollars in gold. Fiat currency now fills most monetary roles. Switzerland was the last country to tie its currency to gold; it backed 40% of its value until the Swiss joined the International Monetary Fund in 1999.NEWS,weblink The New York Times, Swiss Narrowly Vote to Drop Gold Standard, 19 April 1999, Central banks continue to keep a portion of their liquid reserves as gold in some form, and metals exchanges such as the London Bullion Market Association still clear transactions denominated in gold, including future delivery contracts.Today, gold mining output is declining.WEB, King, Byron,weblinkweblink 15 May 2016, Gold mining decline, BullionVault.com, 20 July 2009, 23 November 2009, With the sharp growth of economies in the 20th century, and increasing foreign exchange, the world's gold reserves and their trading market have become a small fraction of all markets and fixed exchange rates of currencies to gold have been replaced by floating prices for gold and gold future contract.Though the gold stock grows by only 1 or 2% per year, very little metal is irretrievably consumed. Inventory above ground would satisfy many decades of industrial and even artisan uses at current prices.The gold proportion (fineness) of alloys is measured by karat (k). Pure gold (commercially termed fine gold) is designated as 24 karat, abbreviated 24k. English gold coins intended for circulation from 1526 into the 1930s were typically a standard 22k alloy called crown gold,BOOK, Lawrence, Thomas Edward,weblink 103, The Mint: A Day-book of the R.A.F. Depot Between August and December 1922, with Later Notes, 1948, for hardness (American gold coins for circulation after 1837 contain an alloy of 0.900 fine gold, or 21.6 kt).BOOK, Tucker, George,weblink 393, The theory of money and banks investigated, 1839, Although the prices of some platinum group metals can be much higher, gold has long been considered the most desirable of precious metals, and its value has been used as the standard for many currencies. Gold has been used as a symbol for purity, value, royalty, and particularly roles that combine these properties. Gold as a sign of wealth and prestige was ridiculed by Thomas More in his treatise Utopia. On that imaginary island, gold is so abundant that it is used to make chains for slaves, tableware, and lavatory seats. When ambassadors from other countries arrive, dressed in ostentatious gold jewels and badges, the Utopians mistake them for menial servants, paying homage instead to the most modestly dressed of their party.The ISO 4217 currency code of gold is XAU.WEB,weblink Currency codes – ISO 4217, International Organization for Standardization, 25 December 2014, Many holders of gold store it in form of bullion coins or bars as a hedge against inflation or other economic disruptions, though its efficacy as such has been questioned; historically, it has not proven itself reliable as a hedging instrument.WEB,weblink On hedging inflation with gold, Valenta, Philip, 22 June 2018, Medium, 30 November 2018, Modern bullion coins for investment or collector purposes do not require good mechanical wear properties; they are typically fine gold at 24k, although the American Gold Eagle and the British gold sovereign continue to be minted in 22k (0.92) metal in historical tradition, and the South African Krugerrand, first released in 1967, is also 22k (0.92).WEB,weblinkweblink" title="web.archive.org/web/20110203024339weblink">weblink 3 February 2011, The Ever Popular Krugerrand, 2010, americansilvereagletoday.com, 30 August 2011, The special issue Canadian Gold Maple Leaf coin contains the highest purity gold of any bullion coin, at 99.999% or 0.99999, while the popular issue Canadian Gold Maple Leaf coin has a purity of 99.99%. In 2006, the United States Mint began producing the American Buffalo gold bullion coin with a purity of 99.99%. The Australian Gold Kangaroos were first coined in 1986 as the Australian Gold Nugget but changed the reverse design in 1989. Other modern coins include the Austrian Vienna Philharmonic bullion coin and the Chinese Gold Panda.

Price

{{further|Gold as an investment}}(File:Gold price in USD.png|thumb|upright=1.35|Gold price history in 1960–2011){{as of|2017|September|}}, gold is valued at around $42 per gram ($1,300 per troy ounce).Like other precious metals, gold is measured by troy weight and by grams. The proportion of gold in the alloy is measured by karat (k), with 24 karat (24k) being pure gold, and lower karat numbers proportionally less. The purity of a gold bar or coin can also be expressed as a decimal figure ranging from 0 to 1, known as the millesimal fineness, such as 0.995 being nearly pure.The price of gold is determined through trading in the gold and derivatives markets, but a procedure known as the Gold Fixing in London, originating in September 1919, provides a daily benchmark price to the industry. The afternoon fixing was introduced in 1968 to provide a price when US markets are open.BOOK, Warwick-Ching, Tony,weblink 26, The International Gold Trade, 978-1-85573-072-4, 28 February 1993,

History

Historically gold coinage was widely used as currency; when paper money was introduced, it typically was a receipt redeemable for gold coin or bullion. In a monetary system known as the gold standard, a certain weight of gold was given the name of a unit of currency. For a long period, the United States government set the value of the US dollar so that one troy ounce was equal to $20.67 ($0.665 per gram), but in 1934 the dollar was devalued to $35.00 per troy ounce ($0.889/g). By 1961, it was becoming hard to maintain this price, and a pool of US and European banks agreed to manipulate the market to prevent further currency devaluation against increased gold demand.BOOK, Elwell,weblink 11–13, Brief History of the Gold Standard (GS) in the United States, 978-1-4379-8889-5, Craig K., 2011, On 17 March 1968, economic circumstances caused the collapse of the gold pool, and a two-tiered pricing scheme was established whereby gold was still used to settle international accounts at the old $35.00 per troy ounce ($1.13/g) but the price of gold on the private market was allowed to fluctuate; this two-tiered pricing system was abandoned in 1975 when the price of gold was left to find its free-market level.{{citation needed|date=February 2015}} Central banks still hold historical gold reserves as a store of value although the level has generally been declining.{{citation needed|date=February 2015}} The largest gold depository in the world is that of the U.S. Federal Reserve Bank in New York, which holds about 3%WEB, Christian, Perwass,weblinkweblink" title="web.archive.org/web/20120127152357weblink">weblink 27 January 2012, The hidden beauty of gold, 10 May 2011, Hitzer, Eckhard, 22 November 2006, Proceedings of the International Symposium on Advanced Mechanical and Power Engineering 2007 (ISAMPE 2007) between Pukyong National University (Korea), University of Fukui (Japan) and University of Shanghai for Science and Technology (China), 22–25 November 2006, hosted by the University of Fukui (Japan), pp. 157–167. (Figs 15,16,17,23 revised.), of the gold known to exist and accounted for today, as does the similarly laden U.S. Bullion Depository at Fort Knox.In 2005 the World Gold Council estimated total global gold supply to be 3,859 tonnes and demand to be 3,754 tonnes, giving a surplus of 105 tonnes.WEB,weblinkweblink" title="web.archive.org/web/20060719111349weblink">weblink 19 July 2006, World Gold Council > value > research & statistics > statistics > supply and demand statistics, 22 July 2006, After 15 August 1971 Nixon shock, the price began to greatly increase,WEB, kitco,weblink historical charts:gold – 1833–1999 yearly averages, 30 June 2012, and between 1968 and 2000 the price of gold ranged widely, from a high of $850 per troy ounce ($27.33/g) on 21 January 1980, to a low of $252.90 per troy ounce ($8.13/g) on 21 June 1999 (London Gold Fixing).Kitco.com, Gold â€“ London PM Fix 1975 â€“ present (GIF), Retrieved 22 July 2006. Prices increased rapidly from 2001, but the 1980 high was not exceeded until 3 January 2008, when a new maximum of $865.35 per troy ounce was set.WEB,weblinkweblink" title="web.archive.org/web/20090210035134weblink">weblink 10 February 2009, LBMA statistics, Lbma.org.uk, 31 December 2008, 5 April 2009, Another record price was set on 17 March 2008, at $1023.50 per troy ounce ($32.91/g).In late 2009, gold markets experienced renewed momentum upwards due to increased demand and a weakening US dollar.{{citation needed|date=February 2015}} On 2 December 2009, gold reached a new high closing at $1,217.23.NEWS,weblink Gold hits yet another record high, BBC News, 2 December 2009, 6 December 2009, Gold further rallied hitting new highs in May 2010 after the European Union debt crisis prompted further purchase of gold as a safe asset.NEWS, PRECIOUS METALS: Comex Gold Hits All-Time High, The Wall Street Journal, 11 May 2012,weblink 4 August 2010, {{dead link|date=June 2016|bot=medic}}{{cbignore|bot=medic}}WEB,weblink Gold futures hit closing record as investors fret rescue deal, Gibson, Kate, Chang, Sue, 11 May 2010, MarketWatch, 4 August 2010, On 1 March 2011, gold hit a new all-time high of $1432.57, based on investor concerns regarding ongoing unrest in North Africa as well as in the Middle East.NEWS,weblink Gold hits record, oil jumps with Libya unrest, Reuters, 1 March 2011, 1 March 2011, Caroline, Valetkevitch, From April 2001 to August 2011, spot gold prices more than quintupled in value against the US dollar, hitting a new all-time high of $1,913.50 on 23 August 2011,NEWS,weblink Gold Extends Biggest Decline in 18 Months After CME Raises Futures Margins, www.bloomberg.com, 23 August 2011, 30 August 2011, Glenys, Sim, bot: unknown,weblink" title="web.archive.org/web/20140110002029weblink">weblink 10 January 2014, prompting speculation that the long secular bear market had ended and a bull market had returned.WEB,weblinkweblink" title="web.archive.org/web/20090421094351weblink">weblink 21 April 2009, Financial Planning{{!, Gold starts 2006 well, but this is not a 25-year high! |publisher=Ameinfo.com|accessdate=5 April 2009}} However, the price then began a slow decline towards $1200 per troy ounce in late 2014 and 2015.

Other applications

Jewelry

File:MocheGoldNecklace.jpg|thumb|Moche gold necklace depicting feline heads. Larco Museum Collection, Lima, PeruLima, PeruBecause of the softness of pure (24k) gold, it is usually alloyed with base metals for use in jewelry, altering its hardness and ductility, melting point, color and other properties. Alloys with lower karat rating, typically 22k, 18k, 14k or 10k, contain higher percentages of copper or other base metals or silver or palladium in the alloy.weblink" title="web.archive.org/web/20080619061619weblink">Jewellery Alloys. World Gold Council Nickel is toxic, and its release from nickel white gold is controlled by legislation in Europe. Palladium-gold alloys are more expensive than those using nickel.BOOK,weblink Professional goldsmithing: a contemporary guide to traditional jewelry techniques, Revere, Alan, 1 May 1991, Van Nostrand Reinhold, 978-0-442-23898-8, High-karat white gold alloys are more resistant to corrosion than are either pure silver or sterling silver. The Japanese craft of Mokume-gane exploits the color contrasts between laminated colored gold alloys to produce decorative wood-grain effects.By 2014, the gold jewelry industry was escalating despite a dip in gold prices. Demand in the first quarter of 2014 pushed turnover to $23.7 billion according to a World Gold Council report.Gold solder is used for joining the components of gold jewelry by high-temperature hard soldering or brazing. If the work is to be of hallmarking quality, the gold solder alloy must match the fineness (purity) of the work, and alloy formulas are manufactured to color-match yellow and white gold. Gold solder is usually made in at least three melting-point ranges referred to as Easy, Medium and Hard. By using the hard, high-melting point solder first, followed by solders with progressively lower melting points, goldsmiths can assemble complex items with several separate soldered joints. Gold can also be made into thread and used in embroidery.

Electronics

Only 10% of the world consumption of new gold produced goes to industry, but by far the most important industrial use for new gold is in fabrication of corrosion-free electrical connectors in computers and other electrical devices. For example, according to the World Gold Council, a typical cell phone may contain 50 mg of gold, worth about 50 cents. But since nearly one billion cell phones are produced each year, a gold value of 50 cents in each phone adds to $500 million in gold from just this application.Uses of gold Accessed 4 November 2014Though gold is attacked by free chlorine, its good conductivity and general resistance to oxidation and corrosion in other environments (including resistance to non-chlorinated acids) has led to its widespread industrial use in the electronic era as a thin-layer coating on electrical connectors, thereby ensuring good connection. For example, gold is used in the connectors of the more expensive electronics cables, such as audio, video and USB cables. The benefit of using gold over other connector metals such as tin in these applications has been debated; gold connectors are often criticized by audio-visual experts as unnecessary for most consumers and seen as simply a marketing ploy. However, the use of gold in other applications in electronic sliding contacts in highly humid or corrosive atmospheres, and in use for contacts with a very high failure cost (certain computers, communications equipment, spacecraft, jet aircraft engines) remains very common.BOOK
, Krech III, Shepard
, Merchant, Carolyn
, McNeill, John Robert
, Encyclopedia of World Environmental History
, 2: F–N
, 2004
, Routledge
, 978-0-415-93734-4
, 597–
, {{google books, y, G7JrhAy5phoC, 597, }}
Besides sliding electrical contacts, gold is also used in electrical contacts because of its resistance to corrosion, electrical conductivity, ductility and lack of toxicity.WEB, General Electric Contact Materials, Electrical Contact Catalog (Material Catalog), Tanaka Precious Metals, 2005,weblinkweblink" title="web.archive.org/web/20010303213152weblink">weblink dead, 3 March 2001, 21 February 2007, Switch contacts are generally subjected to more intense corrosion stress than are sliding contacts. Fine gold wires are used to connect semiconductor devices to their packages through a process known as wire bonding.The concentration of free electrons in gold metal is 5.91×1022 cm−3.BOOK,weblink Electronic, Magnetic, and Optical Materials, Second Edition, Fulay, Pradeep, Lee, Jung-Kun, 2016, CRC Press, 978-1-4987-0173-0, Gold is highly conductive to electricity, and has been used for electrical wiring in some high-energy applications (only silver and copper are more conductive per volume, but gold has the advantage of corrosion resistance). For example, gold electrical wires were used during some of the Manhattan Project's atomic experiments, but large high-current silver wires were used in the calutron isotope separator magnets in the project.It is estimated that 16% of the world's gold and 22% of the world's silver is contained in electronic technology in Japan.NEWS,weblink Japan wants citizens to donate their old phone to make 2020 Olympics medals, TechRadar, 23 August 2016, Peckham, James,

Medicine

Metallic and gold compounds have long been used for medicinal purposes. Gold, usually as the metal, is perhaps the most anciently administered medicine (apparently by shamanic practitioners)JOURNAL, 10.1007/s10787-007-0021-x, Clinical pharmacology of gold, 2008, Kean, W. F., Kean, I. R. L., Inflammopharmacology, 16, 3, 112–25, 18523733, and known to Dioscorides.BOOK, Moir, David Macbeth,weblink Outlines of the ancient history of medicine, 1831, Mortier, Tom. An experimental study on the preparation of gold nanoparticles and their properties, PhD thesis, University of Leuven (May 2006) In medieval times, gold was often seen as beneficial for the health, in the belief that something so rare and beautiful could not be anything but healthy. Even some modern esotericists and forms of alternative medicine assign metallic gold a healing power.In the 19th century gold had a reputation as a "nervine", a therapy for nervous disorders. Depression, epilepsy, migraine, and glandular problems such as amenorrhea and impotence were treated, and most notably alcoholism (Keeley, 1897).JOURNAL, Richards, Douglas G., McMillin, David L., Mein, Eric A., Nelson, Carl D., yes, Gold and its relationship to neurological/glandular conditions, The International Journal of Neuroscience, 112, 1, 31–53, January 2002, 12152404, 10.1080/00207450212018, The apparent paradox of the actual toxicology of the substance suggests the possibility of serious gaps in the understanding of the action of gold in physiology.JOURNAL, 10.1006/biol.1997.0123, 9637749, Gold, the Noble Metal and the Paradoxes of its Toxicology, 1998, Merchant, B., Biologicals, 26, 49–59, 1, Only salts and radioisotopes of gold are of pharmacological value, since elemental (metallic) gold is inert to all chemicals it encounters inside the body (i.e., ingested gold cannot be attacked by stomach acid). Some gold salts do have anti-inflammatory properties and at present two are still used as pharmaceuticals in the treatment of arthritis and other similar conditions in the US (sodium aurothiomalate and auranofin). These drugs have been explored as a means to help to reduce the pain and swelling of rheumatoid arthritis, and also (historically) against tuberculosis and some parasites.BOOK, L., Messori, G., Marcon,weblink Gold Complexes in the treatment of Rheumatoid Arthritis, Metal ions and their complexes in medication, Sigel, Astrid, CRC Press, 2004, 978-0-8247-5351-1, 280–301, Gold alloys are used in restorative dentistry, especially in tooth restorations, such as crowns and permanent bridges. The gold alloys' slight malleability facilitates the creation of a superior molar mating surface with other teeth and produces results that are generally more satisfactory than those produced by the creation of porcelain crowns. The use of gold crowns in more prominent teeth such as incisors is favored in some cultures and discouraged in others.Colloidal gold preparations (suspensions of gold nanoparticles) in water are intensely red-colored, and can be made with tightly controlled particle sizes up to a few tens of nanometers across by reduction of gold chloride with citrate or ascorbate ions. Colloidal gold is used in research applications in medicine, biology and materials science. The technique of immunogold labeling exploits the ability of the gold particles to adsorb protein molecules onto their surfaces. Colloidal gold particles coated with specific antibodies can be used as probes for the presence and position of antigens on the surfaces of cells.JOURNAL, 10.1016/0019-2791(71)90496-4, 4110101, 1971, Faulk, W. P., Taylor, G. M., An immunocolloid method for the electron microscope, 8, 11, 1081–3, Immunochemistry, In ultrathin sections of tissues viewed by electron microscopy, the immunogold labels appear as extremely dense round spots at the position of the antigen.JOURNAL, 6153194, 1980, Roth, J., Bendayan, M., Orci, L., FITC-protein A-gold complex for light and electron microscopic immunocytochemistry, 28, 1, 55–7, Journal of Histochemistry and Cytochemistry, 10.1177/28.1.6153194, Gold, or alloys of gold and palladium, are applied as conductive coating to biological specimens and other non-conducting materials such as plastics and glass to be viewed in a scanning electron microscope. The coating, which is usually applied by sputtering with an argon plasma, has a triple role in this application. Gold's very high electrical conductivity drains electrical charge to earth, and its very high density provides stopping power for electrons in the electron beam, helping to limit the depth to which the electron beam penetrates the specimen. This improves definition of the position and topography of the specimen surface and increases the spatial resolution of the image. Gold also produces a high output of secondary electrons when irradiated by an electron beam, and these low-energy electrons are the most commonly used signal source used in the scanning electron microscope.BOOK, Bozzola, John J., Russell, Lonnie Dee,weblink 65, Electron microscopy: principles and techniques for biologists, yes, Jones & Bartlett Learning, 1999, 978-0-7637-0192-5, The isotope gold-198 (half-life 2.7 days) is used in nuclear medicine, in some cancer treatments and for treating other diseases.WEB,weblinkweblink" title="web.archive.org/web/20090314121232weblink">weblink 14 March 2009, Nanoscience and Nanotechnology in Nanomedicine: Hybrid Nanoparticles In Imaging and Therapy of Prostate Cancer, Radiopharmaceutical Sciences Institute, University of Missouri-Columbia, JOURNAL, 10.1211/jpp.60.8.0005, Radiotherapy enhancement with gold nanoparticles, 2008, Hainfeld, James F., Dilmanian, F. Avraham, Slatkin, Daniel N., Smilowitz, Henry M., Journal of Pharmacy and Pharmacology, 60, 8, 977–85, 18644191,

Cuisine

missing image!
- Cake with pure gold (3038005040).jpg -
Cake with gold decoration served at the Amstel Hotel, Amsterdam
  • Gold can be used in food and has the E number 175.NEWS,weblink Current EU approved additives and their E Numbers, 27 July 2007, Food Standards Agency, UK, In 2016, the European Food Safety Authority published an opinion on the re-evaluation of gold as a food additive. Concerns included the possible presence of minute amounts of gold nanoparticles in the food additive, and that gold nanoparticles have been shown to be genotoxic in mammalian cells in vitro.JOURNAL, Scientific Opinion on the re-evaluation of gold (E 175) as a food additive, EFSA Journal, 14, 1, 2016, 1831-4732, 10.2903/j.efsa.2016.4362, 4362,
  • Gold leaf, flake or dust is used on and in some gourmet foods, notably sweets and drinks as decorative ingredient.WEB, The Food Dictionary: Varak, Barron's Educational Services, Inc., 1995,weblinkweblink" title="web.archive.org/web/20060523014547weblink">weblink 23 May 2006, 27 May 2007, Gold flake was used by the nobility in medieval Europe as a decoration in food and drinks,BOOK,weblink Commensality: From Everyday Food to Feast, Kerner, Susanne, Chou, Cynthia, Warmind, Morten, 94, 2015, Bloomsbury Publishing, 978-0-85785-719-4, in the form of leaf, flakes or dust, either to demonstrate the host's wealth or in the belief that something that valuable and rare must be beneficial for one's health.{{Citation needed|date=December 2016}}
  • Danziger Goldwasser (German: Gold water of Danzig) or Goldwasser () is a traditional German herbal liqueurBOOK,weblink Deutschland nebst Theilen der angrenzenden Länder, Danzig, Karl, Baedeker, 1865, Karl Baedeker, German, produced in what is today GdaÅ„sk, Poland, and Schwabach, Germany, and contains flakes of gold leaf. There are also some expensive (c. $1000) cocktails which contain flakes of gold leaf. However, since metallic gold is inert to all body chemistry, it has no taste, it provides no nutrition, and it leaves the body unaltered.WEB,weblink The Many Uses of Gold, 6 June 2009, King, Hobart M., geology.com,
  • Vark is a foil composed of a pure metal that is sometimes gold,Gold in Gastronomy. deLafee, Switzerland (2008) and is used for garnishing sweets in South Asian cuisine.

Miscellanea

File:James Webb Space Telescope Mirror33.jpg|thumb|Mirror for the James Webb Space TelescopeJames Webb Space Telescope
  • Gold produces a deep, intense red color when used as a coloring agent in cranberry glass.
  • In photography, gold toners are used to shift the color of silver bromide black-and-white prints towards brown or blue tones, or to increase their stability. Used on sepia-toned prints, gold toners produce red tones. Kodak published formulas for several types of gold toners, which use gold as the chloride.weblink" title="web.archive.org/web/20160817134815weblink">Toning black-and-white materials. Kodak Technical Data/Reference sheet G-23, May 2006.
  • Gold is a good reflector of electromagnetic radiation such as infrared and visible light, as well as radio waves. It is used for the protective coatings on many artificial satellites, in infrared protective faceplates in thermal-protection suits and astronauts' helmets, and in electronic warfare planes such as the EA-6B Prowler.
  • Gold is used as the reflective layer on some high-end CDs.
  • Automobiles may use gold for heat shielding. McLaren uses gold foil in the engine compartment of its F1 model.BOOK, Martin, Keith,weblink 1997 McLaren F1,
  • Gold can be manufactured so thin that it appears semi-transparent. It is used in some aircraft cockpit windows for de-icing or anti-icing by passing electricity through it. The heat produced by the resistance of the gold is enough to prevent ice from forming.NEWS,weblinkweblink" title="web.archive.org/web/20110726122946weblink">weblink 26 July 2011, The Demand for Gold by Industry, Gold bulletin, 6 June 2009,
  • Gold is attacked by and dissolves in alkaline solutions of potassium or sodium cyanide, to form the salt gold cyanide—a technique that has been used in extracting metallic gold from ores in the cyanide process. Gold cyanide is the electrolyte used in commercial electroplating of gold onto base metals and electroforming.
  • Gold chloride (chloroauric acid) solutions are used to make colloidal gold by reduction with citrate or ascorbate ions. Gold chloride and gold oxide are used to make cranberry or red-colored glass, which, like colloidal gold suspensions, contains evenly sized spherical gold nanoparticles.WEB,weblink Colored glass chemistry, 6 June 2009,
  • Gold, when dispersed in nanoparticles, can act as a heterogeneous catalyst of chemical reactions.

Toxicity

Pure metallic (elemental) gold is non-toxic and non-irritating when ingestedWEB, Dierks, S., Gold MSDS,weblink" title="web.archive.org/web/20061110104358weblink">weblink's/gold.htm, Electronic Space Products International, May 2005, and is sometimes used as a food decoration in the form of gold leaf.BOOK,weblink Gold Nanoparticles for Physics, Chemistry and Biology, Louis, Catherine, Pluchery, Olivier, 2012, World Scientific, 978-1-84816-807-7, Metallic gold is also a component of the alcoholic drinks Goldschläger, Gold Strike, and Goldwasser. Metallic gold is approved as a food additive in the EU (E175 in the Codex Alimentarius). Although the gold ion is toxic, the acceptance of metallic gold as a food additive is due to its relative chemical inertness, and resistance to being corroded or transformed into soluble salts (gold compounds) by any known chemical process which would be encountered in the human body.Soluble compounds (gold salts) such as gold chloride are toxic to the liver and kidneys. Common cyanide salts of gold such as potassium gold cyanide, used in gold electroplating, are toxic by virtue of both their cyanide and gold content. There are rare cases of lethal gold poisoning from potassium gold cyanide.JOURNAL, Wright, I. H., J. C., Vesey, 1986, Acute poisoning with gold cyanide, Anaesthesia, 41, 79, 936–939, 10.1111/j.1365-2044.1986.tb12920.x, 3022615, JOURNAL, Wu, Ming-Ling, Wei-Jen, Tsai, Jiin, Ger, Jou-Fang, Deng, Tsay, Shyh-Haw, 5, Yang, Mo-Hsiung, Clinical Toxicology, 2001, 39, 7, 739–743, Cholestatic Hepatitis Caused by Acute Gold Potassium Cyanide Poisoning, 10.1081/CLT-100108516, 11778673, Gold toxicity can be ameliorated with chelation therapy with an agent such as dimercaprol.Gold metal was voted Allergen of the Year in 2001 by the American Contact Dermatitis Society; gold contact allergies affect mostly women.JOURNAL, Tsuruta, Kyoko, Matsunaga, Kayoko, Suzuki, Kayoko, Suzuki, Rie, Akita, Hirotaka, Washimi, Yasuko, Tomitaka, Akiko, Ueda, Hiroshi, Female predominance of gold allergy, Contact Dermatitis, 44, 1, 2001, 48–49, 10.1034/j.1600-0536.2001.440107-22.x, Despite this, gold is a relatively non-potent contact allergen, in comparison with metals like nickel.NEWS, Brunk, Doug,weblinkweblink" title="web.archive.org/web/20110624033428weblink">weblink dead, 24 June 2011, Ubiquitous nickel wins skin contact allergy award for 2008, 15 February 2008, A sample of the fungus Aspergillus niger was found growing from gold mining solution; and was found to contain cyano metal complexes, such as gold, silver, copper iron and zinc. The fungus also plays a role in the solubilization of heavy metal sulfides.BOOK, Singh, Harbhajan,weblink Mycoremediation: Fungal Bioremediation, 509, 978-0-470-05058-3, 2006,

See also

{{Colbegin|colwidth=20em}} {{colend}}

References

{{Reflist|30em}}

External links

{{Commons|Gold}}{{Wiktionary|gold}} {{Compact periodic table}}{{Gold compounds}}{{Jewellery}}{{Authority control}}

- content above as imported from Wikipedia
- "gold" does not exist on GetWiki (yet)
- time: 9:20am EDT - Mon, Sep 23 2019
[ this remote article is provided by Wikipedia ]
LATEST EDITS [ see all ]
GETWIKI 09 JUL 2019
Eastern Philosophy
History of Philosophy
GETWIKI 09 MAY 2016
GETWIKI 18 OCT 2015
M.R.M. Parrott
Biographies
GETWIKI 20 AUG 2014
GETWIKI 19 AUG 2014
CONNECT