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124-591: Bernhardt Otto Holtermann (29 April 1838 – 29 April 1885) was a successful gold miner, businessman, politician and photographer in Australia. Perhaps his greatest claim to fame is his association with the Holtermann Nugget, the largest gold specimen ever found, 59 inches (1.5 m) long, weighing 630 pounds (290 kg) and with an estimated gold content of 3,000 troy ounces (93 kg), found at Hill End , near Bathurst, New South Wales . This gave him
248-399: A fault . Water often lubricates faults, filling in fractures and jogs. About 10 kilometres (6.2 mi) below the surface, under very high 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
372-718: A southerly buster , a powerful southerly that brings gale winds and a rapid fall in temperature. Since Sydney is downwind of the Great Dividing Range , it occasionally experiences dry, westerly foehn winds typically in winter and early spring (which are the reason for its warm maximum temperatures). Westerly winds are intense when the Roaring Forties (or the Southern Annular Mode ) shift towards southeastern Australia, where they may damage homes and affect flights , in addition to making
496-483: A dilute solution of gold(III) chloride or chlorauric acid . Unlike sulfur, phosphorus reacts directly with gold at elevated temperatures to produce gold phosphide (Au 2 P 3 ). 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
620-519: A feature of Sydney's topography. After Phillip's departure in December 1792, the colony's military officers began acquiring land and importing consumer goods from visiting ships. Former convicts engaged in trade and opened small businesses. Soldiers and former convicts built houses on Crown land, with or without official permission, in what was now commonly called Sydney town. Governor William Bligh (1806–08) imposed restrictions on commerce and ordered
744-696: A few areas of wet sclerophyll forests in the wetter, elevated areas in the north and northeast . These forests are defined by straight, tall tree canopies with a moist understory of soft-leaved shrubs, tree ferns and herbs. The predominant vegetation community in Sydney is the Cumberland Plain Woodland in Western Sydney ( Cumberland Plain ), followed by the Sydney Turpentine-Ironbark Forest in
868-511: A fresh water supply and a safe harbour, which Philip described as "the finest Harbour in the World ... Here a Thousand Sail of the Line may ride in the most perfect Security". The settlement was planned to be a self-sufficient penal colony based on subsistence agriculture. Trade and shipbuilding were banned in order to keep the convicts isolated. However, the soil around the settlement proved poor and
992-579: A gold-from-seawater swindle in the United States in the 1890s, as did an English fraudster in the early 1900s. 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 . 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 ended
1116-830: 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 . 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 , indium , and other elements can produce more unusual colors of gold for various applications. Colloidal gold , used by electron-microscopists,
1240-567: A large alluvial deposit. The mines at Roşia 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
1364-462: A novel type of metal-halide perovskite material consisting of Au and Au cations in its crystal structure has been found. It has been shown to be unexpectedly stable at normal conditions. Gold pentafluoride , along with its derivative anion, AuF − 6 , and its difluorine complex , gold heptafluoride , is the sole example of gold(V), the highest verified oxidation state. Some gold compounds exhibit aurophilic bonding , which describes
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#17327934874361488-607: A pattern of resistance that was to be repeated as the colonial frontier expanded . A military garrison was established on the Hawkesbury in 1795. The death toll from 1794 to 1800 was 26 settlers and up to 200 Darug. Conflict again erupted from 1814 to 1816 with the expansion of the colony into Dharawal country in the Nepean region south-west of Sydney. Following the deaths of several settlers, Governor Macquarie dispatched three military detachments into Dharawal lands, culminating in
1612-486: A planner to design the street layout of Sydney and commissioned the construction of roads, wharves, churches, and public buildings. Parramatta Road , linking Sydney and Parramatta, was opened in 1811, and a road across the Blue Mountains was completed in 1815, opening the way for large-scale farming and grazing west of the Great Dividing Range . Following the departure of Macquarie, official policy encouraged
1736-423: A rich ceremonial life, part of a belief system centring on ancestral, totemic and supernatural beings. People from different clans and language groups came together to participate in initiation and other ceremonies. These occasions fostered trade, marriages and clan alliances. The earliest British settlers recorded the word ' Eora ' as an Aboriginal term meaning either 'people' or 'from this place'. The clans of
1860-561: A severe dust storm towards the city . The Greater Sydney Commission divides Sydney into three "cities" and five "districts" based on the 33 LGAs in the metropolitan area. The "metropolis of three cities" comprises Eastern Harbour City , Central River City and Western Parkland City . The Australian Bureau of Statistics also includes City of Central Coast (the former Gosford City and Wyong Shire) as part of Greater Sydney for population counts, adding 330,000 people. The CBD extends about 3 km (1.9 mi) south from Sydney Cove . It
1984-401: A sheet of 1 square metre (11 sq ft), and an avoirdupois ounce into 28 square metres (300 sq ft). Gold leaf can be beaten thin enough to become semi-transparent. The transmitted light appears greenish-blue because gold strongly reflects yellow and red. Such semi-transparent sheets also strongly reflect infrared light, making them useful as infrared (radiant heat) shields in
2108-520: A solution of Au(OH) 3 in concentrated H 2 SO 4 produces red crystals of gold(II) sulfate , Au 2 (SO 4 ) 2 . Originally thought to be a mixed-valence compound, it has been shown to contain Au 4+ 2 cations, analogous to the better-known mercury(I) ion, Hg 2+ 2 . A gold(II) complex, the tetraxenonogold(II) cation, which contains xenon as a ligand, occurs in [AuXe 4 ](Sb 2 F 11 ) 2 . In September 2023,
2232-739: A year have temperatures at or above 30 °C (86 °F) in the central business district (CBD). In contrast, the metropolitan area averages between 35 and 65 days, depending on the suburb. The hottest day in the metropolitan area occurred in Penrith on 4 January 2020, where a high of 48.9 °C (120.0 °F) was recorded. The average annual temperature of the sea ranges from 18.5 °C (65.3 °F) in September to 23.7 °C (74.7 °F) in February. Sydney has an average of 7.2 hours of sunshine per day and 109.5 clear days annually. Due to
2356-470: Is Au with a half-life of 2.27 days. Gold's least stable isomer is Au with a half-life of only 7 ns. Au has three decay paths: β decay, isomeric transition , and alpha decay. No other isomer or isotope of gold has three decay paths. The possible 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,
2480-696: Is 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 Au , which decays by electron capture, and Au , which decays most often by electron capture (93%) with a minor β decay path (7%). All of gold's radioisotopes with atomic masses above 197 decay by β decay. At least 32 nuclear isomers have also been characterized, ranging in atomic mass from 170 to 200. Within that range, only Au , Au , Au , Au , and Au do not have isomers. Gold's most stable isomer
2604-648: Is also known, an example of a mixed-valence complex . Gold does not react with oxygen at any temperature and, up to 100 °C, is resistant to attack from ozone: Au + O 2 ⟶ ( no reaction ) {\displaystyle {\ce {Au + O2 ->}}({\text{no reaction}})} Au + O 3 → t < 100 ∘ C ( no reaction ) {\displaystyle {\ce {Au{}+O3->[{} \atop {t<100^{\circ }{\text{C}}}]}}({\text{no reaction}})} Some free halogens react to form
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#17327934874362728-520: Is also used in infrared shielding, the production of colored glass , gold leafing , and tooth restoration . Certain gold salts are still used as anti-inflammatory agents in medicine. Gold is the most malleable of all metals. It can be drawn into a wire of single-atom width, and then stretched considerably before it breaks. Such nanowires distort via the formation, reorientation, and migration of dislocations and crystal twins without noticeable hardening. A single gram of gold can be beaten into
2852-427: Is always richer at the exposed surface of gold-bearing veins, owing to the oxidation of accompanying minerals followed by weathering; and by 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
2976-517: Is attributed to wind-blown dust or rivers. At 10 parts per quadrillion, the Earth's oceans would hold 15,000 tonnes of gold. 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
3100-540: Is bordered by Farm Cove within the Royal Botanic Garden to the east and Darling Harbour to the west. Suburbs surrounding the CBD include Woolloomooloo and Potts Point to the east, Surry Hills and Darlinghurst to the south, Pyrmont and Ultimo to the west, and Millers Point and The Rocks to the north. Most of these suburbs measure less than 1 km (0.4 sq mi) in area. The Sydney CBD
3224-451: Is characterised by narrow streets and thoroughfares, created in its convict beginnings. Several localities, distinct from suburbs, exist throughout Sydney's inner reaches. Central and Circular Quay are transport hubs with ferry, rail, and bus interchanges. Chinatown , Darling Harbour, and Kings Cross are important locations for culture, tourism, and recreation. The Strand Arcade , located between Pitt Street Mall and George Street ,
3348-470: 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, and is commonly known as white gold . Electrum's color runs from golden-silvery to silvery, dependent upon
3472-740: Is housed in the State Library of New South Wales and presented in Gulgong Holtermann Museum . When the Hill End Borough Council was constituted on 6 August 1873, Holtermann was elected an alderman of the first council. In October 1874, Holtermann was elected an alderman in a special election for the Belmore Ward of the Borough of St Leonards . In 1882, on his third try, Holtermann was elected to
3596-472: Is most often called the oldest since this treasure is the largest and most diverse. Gold artifacts probably made their first appearance in Ancient Egypt at the very beginning of the pre-dynastic period, 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
3720-542: Is now questioned. The gold-bearing Witwatersrand rocks were laid down between 700 and 950 million years before the Vredefort impact. 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, and thus the gold did not actually arrive in the asteroid/meteorite. What the Vredefort impact achieved, however,
3844-571: Is now the Sydney Church of England Grammar School . He invested wisely and kept his wealth, allowing him to take up his true passion of photography. Holtermann financed and possibly participated in Beaufoy Merlin 's project to photograph New South Wales and exhibit the results abroad to encourage immigration. The work was taken up after Merlin's death in 1873 by his assistant, Charles Bayliss . In 1875, Holtermann and Bayliss produced
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3968-427: Is red if the particles are small; larger particles of colloidal gold are blue. Gold has only one stable isotope , 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 Au with a half-life of 186.1 days. The least stable
4092-553: Is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid ), forming a soluble tetrachloroaurate anion . Gold is insoluble in nitric acid alone, which dissolves silver and base metals , a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term ' acid test '. Gold dissolves in alkaline solutions of cyanide , which are used in mining and electroplating . Gold also dissolves in mercury , forming amalgam alloys, and as
4216-484: 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
4340-589: 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. Au(III) (referred to as auric) is a common oxidation state, and is illustrated by gold(III) chloride , Au 2 Cl 6 . The gold atom centers in Au(III) complexes, like other d compounds, are typically square planar , with chemical bonds that have both covalent and ionic character. Gold(I,III) chloride
4464-657: Is thought to have been delivered to Earth by asteroid impacts during the Late Heavy Bombardment , about 4 billion years ago. Gold which is reachable by humans has, in one case, been associated with a particular asteroid impact. The asteroid that formed Vredefort impact structure 2.020 billion years ago is often credited with seeding the Witwatersrand basin in South Africa with the richest gold deposits on earth. However, this scenario
4588-511: Is thought to have been produced in supernova nucleosynthesis , and from the collision of neutron stars , and to have been present in the dust from which the Solar System formed. Traditionally, gold in the universe is thought to have formed by the r-process (rapid neutron capture) in supernova nucleosynthesis , but more recently it has been suggested that gold and other elements heavier than iron may also be produced in quantity by
4712-416: 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
4836-523: The Appin massacre (April 1816) in which at least 14 Aboriginal people were killed. The New South Wales Legislative Council became a semi-elected body in 1842. Sydney was declared a city the same year, and a governing council established, elected on a restrictive property franchise. The discovery of gold in New South Wales and Victoria in 1851 initially caused economic disruption as men moved to
4960-461: The Australian raven , Australian magpie , crested pigeon , noisy miner and the pied currawong . Introduced bird species ubiquitously found in Sydney are the common myna , common starling , house sparrow and the spotted dove . Reptile species are also numerous and predominantly include skinks . Sydney has a few mammal and spider species, such as the grey-headed flying fox and
5084-666: 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
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5208-465: The Cooks River into Botany Bay. There is no single definition of the boundaries of Sydney. The Australian Statistical Geography Standard definition of Greater Sydney covers 12,369 km (4,776 sq mi) and includes the local government areas of Central Coast in the north, Hawkesbury in the north-west, Blue Mountains in the west, Sutherland Shire in the south, and Wollondilly in
5332-698: The Emerald City and the Harbour City . Aboriginal Australians have inhabited the Greater Sydney region for at least 30,000 years, and their engravings and cultural sites are common. The traditional custodians of the land on which modern Sydney stands are the clans of the Darug , Dharawal and Eora peoples. During his first Pacific voyage in 1770, James Cook charted the eastern coast of Australia, making landfall at Botany Bay . In 1788,
5456-609: The First Fleet of convicts , led by Arthur Phillip , founded Sydney as a British penal colony , the first European settlement in Australia. After World War II, Sydney experienced mass migration and by 2021 over 40 per cent of the population was born overseas. Foreign countries of birth with the greatest representation are mainland China, India, the United Kingdom, Vietnam and the Philippines. Despite being one of
5580-496: The Garden Island Tunnel System , the only tunnel warfare complex in Sydney, and the heritage-listed military fortification systems Bradleys Head Fortification Complex and Middle Head Fortifications , which were part of a total defence system for Sydney Harbour . A post-war immigration and baby boom saw a rapid increase in Sydney's population and the spread of low-density housing in suburbs throughout
5704-589: The Hawkesbury River in the north and north-west, to the Royal National Park and Macarthur in the south and south-west. Greater Sydney consists of 658 suburbs, spread across 33 local government areas. Residents of the city are colloquially known as "Sydneysiders". The estimated population in June 2023 was 5,450,496, which is about 66% of the state's population. The city's nicknames include
5828-659: The Middle East and Africa becoming major sources. By 2021, the population of Sydney was over 5.2 million, with 40% of the population born overseas. China and India overtook England as the largest source countries for overseas-born residents. Sydney is a coastal basin with the Tasman Sea to the east, the Blue Mountains to the west, the Hawkesbury River to the north, and the Woronora Plateau to
5952-599: The New South Wales Legislative Assembly for St Leonards , which he served until his death. Holtermann was also interested in patent medicine . He was proud of having cured fellow passengers on his 1858 sea voyage to Australia. After he retired from mining, he wrote papers and devised formulae for medicines, and promoted and sold "Holtermann's Life Preserving Drops". He died in Sydney , Australia on his birthday, 29 April 1885, of " cancer of
6076-602: 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
6200-610: The Sydney funnel-web , respectively, and has a huge diversity of marine species inhabiting its harbour and beaches. Under the Köppen–Geiger classification , Sydney has a humid subtropical climate ( Cfa ) with "warm, sometimes hot" summers and "generally mild", to "cool" winters. The El Niño–Southern Oscillation , the Indian Ocean Dipole and the Southern Annular Mode play an important role in determining Sydney's weather patterns: drought and bushfire on
6324-645: The University of New South Wales are ranked 18th and 19th in the world respectively. Sydney has hosted major international sporting events such as the 2000 Summer Olympics , the 2003 Rugby World Cup Final , and the 2023 FIFA Women's World Cup Final . The city is among the top fifteen most-visited, with millions of tourists coming each year to see the city's landmarks. The city has over 1,000,000 ha (2,500,000 acres) of nature reserves and parks , and its notable natural features include Sydney Harbour and Royal National Park . The Sydney Harbour Bridge and
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#17327934874366448-624: The University of Sydney (1854–61), the Australian Museum (1858–66), the Town Hall (1868–88), and the General Post Office (1866–92). Elaborate coffee palaces and hotels were erected. Daylight bathing at Sydney's beaches was banned, but segregated bathing at designated ocean baths was popular. Drought, the winding down of public works and a financial crisis led to economic depression in Sydney throughout most of
6572-658: The Varna Necropolis near Lake Varna and the Black Sea coast, thought to be the earliest "well-dated" finding of gold artifacts in history. Several prehistoric Bulgarian finds are considered no less old – the golden treasures of Hotnitsa, Durankulak , artifacts from the Kurgan settlement of Yunatsite near Pazardzhik , the golden treasure Sakar, as well as beads and gold jewelry found in the Kurgan settlement of Provadia – Solnitsata ("salt pit"). However, Varna gold
6696-611: The noble metals . It is one of the least reactive chemical elements, being the second-lowest in the reactivity series . It is solid under standard conditions . Gold often occurs in free elemental ( native state ), as nuggets or grains, in rocks , veins , and alluvial deposits . It occurs in a solid solution series with the native element silver (as in electrum ), naturally alloyed with other metals like copper and palladium , and mineral inclusions such as within pyrite . Less commonly, it occurs in minerals as gold compounds, often with tellurium ( gold tellurides ). Gold
6820-470: 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. 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; rubidium, potassium, and tetramethylammonium aurides are also known. Gold has
6944-593: The "Aborigines of Australia" declared 26 January "A Day of Mourning " for "the whiteman's seizure of our country." With the outbreak of Second World War in 1939, Sydney experienced a surge in industrial development. Unemployment virtually disappeared and women moved into jobs previously typically reserved for males. Sydney was attacked by Japanese submarines in May and June 1942 with 21 killed. Households built air raid shelters and performed drills. Military establishments in response to World War II in Australia included
7068-627: The 1890s. Meanwhile, the Sydney-based premier of New South Wales, George Reid , became a key figure in the process of federation. When the six colonies federated on 1 January 1901, Sydney became the capital of the State of New South Wales. The spread of bubonic plague in 1900 prompted the state government to modernise the wharves and demolish inner-city slums. The outbreak of the First World War in 1914 saw more Sydney males volunteer for
7192-462: The 2017 gold price), but was turned down, and it was sent away to have the gold extracted. Disheartened, he resigned from the company in February 1873. He built a large mansion, "The Towers" in North Sydney , complete with a stained glass window depicting himself and the specimen. Located at a panoramic location near Blue and William streets, he resided there until his death in 1885 and its site
7316-569: The CBD. In the warm season black nor'easters are usually the cause of heavy rain events, though other forms of low-pressure areas , including remnants of ex-cyclones , may also bring heavy deluge and afternoon thunderstorms. 'Snow' was last alleged in 1836, more than likely a fall of graupel , or soft hail; and in July 2008 the Upper North Shore saw a fall of graupel that was mistaken by many for 'snow'. In 2009, dry conditions brought
7440-481: The Cumberland Plain. Immigrants—mostly from Britain and continental Europe—and their children accounted for over three-quarters of Sydney's population growth between 1947 and 1971. The newly created Cumberland County Council oversaw low-density residential developments, the largest at Green Valley and Mount Druitt . Older residential centres such as Parramatta, Bankstown and Liverpool became suburbs of
7564-636: The Holtermann panorama, a series of "23 albumen silver photographs which join together to form a continuous 978-centimetre view of Sydney Harbour and its suburbs." Some of the photographs, including the panorama, were displayed at the Philadelphia Centennial Exhibition , where they won a bronze medal. The panorama was also displayed at the 1878 Exposition Universelle Internationale in Paris. Holtermann and Bayliss also made
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#17327934874367688-932: The Inner West and Northern Sydney , the Eastern Suburbs Banksia Scrub in the coastline and the Blue Gum High Forest scantily present in the North Shore – all of which are critically endangered. The city also includes the Sydney Sandstone Ridgetop Woodland found in Ku-ring-gai Chase National Park on the Hornsby Plateau to the north. Sydney is home to dozens of bird species, which commonly include
7812-534: The Star of Hope Gold Mining Company, in which he and Beyers were among the partners, struck rich veins of gold. On 19 October 1872, the Holtermann Nugget was discovered. Not strictly speaking a nugget, it was a gold specimen, a mass of gold embedded in rock, in this case quartz . Holtermann attempted to buy the 3,000-troy-ounce (93-kilogram) specimen from the company, offering £1000 over its estimated value of £12,000 (about AU$ 1.9 million in 2016 currency, AU$ 4.8 million on
7936-593: The Sydney area occupied land with traditional boundaries. There is debate, however, about which group or nation these clans belonged to, and the extent of differences in language and rites. The major groups were the coastal Eora people, the Dharug (Darug) occupying the inland area from Parramatta to the Blue Mountains, and the Dharawal people south of Botany Bay. Darginung and Gundungurra languages were spoken on
8060-442: The Sydney region are grassy woodlands (i.e. savannas ) and some pockets of dry sclerophyll forests, which consist of eucalyptus trees, casuarinas , melaleucas , corymbias and angophoras , with shrubs (typically wattles , callistemons , grevilleas and banksias ), and a semi-continuous grass in the understory . The plants in this community tend to have rough, spiky leaves due to low soil fertility . Sydney also features
8184-568: The Union Jack 165 years earlier, commencing her Australian Royal Tour . It was the first time a reigning monarch stepped onto Australian soil. Increasing high-rise development in Sydney and the expansion of suburbs beyond the "green belt" envisaged by the planners of the 1950s resulted in community protests. In the early 1970s, trade unions and resident action groups imposed green bans on development projects in historic areas such as The Rocks. Federal, State and local governments introduced heritage and environmental legislation. The Sydney Opera House
8308-409: The World Heritage-listed Sydney Opera House are major tourist attractions. Central Station is the hub of Sydney's suburban train, metro and light rail networks and longer-distance services. The main passenger airport serving the city is Kingsford Smith Airport , one of the world's oldest continually operating airports. In 1788, Captain Arthur Phillip , the first governor of New South Wales, named
8432-420: The armed forces than the Commonwealth authorities could process, and helped reduce unemployment. Those returning from the war in 1918 were promised "homes fit for heroes" in new suburbs such as Daceyville and Matraville. "Garden suburbs" and mixed industrial and residential developments also grew along the rail and tram corridors. The population reached one million in 1926, after Sydney had regained its position as
8556-513: The arrival of the British, there were 4,000 to 8,000 Aboriginal people in the greater Sydney region. The inhabitants subsisted on fishing, hunting, and gathering plants and shellfish. The diet of the coastal clans was more reliant on seafood whereas hinterland clans ate more forest animals and plants. The clans had distinctive equipment and weapons mostly made of stone, wood, plant materials, bone and shell. They also differed in their body decorations, hairstyles, songs and dances. Aboriginal clans had
8680-422: The coastal region. The rising sea level between 18,000 and 6,000 years ago flooded the rias to form estuaries and deep harbours. Port Jackson, better known as Sydney Harbour, is one such ria . Sydney features two major soil types: sandy soils (which originate from the Hawkesbury sandstone) and clay (which are from shales and volcanic rocks ), though some soils may be a mixture of the two. Directly overlying
8804-1409: The corresponding gold halides. Gold is strongly attacked by fluorine at dull-red heat to form gold(III) fluoride AuF 3 . Powdered gold reacts with chlorine at 180 °C to form gold(III) chloride AuCl 3 . Gold reacts with bromine at 140 °C to form a combination of gold(III) bromide AuBr 3 and gold(I) bromide AuBr, but reacts very slowly with iodine to form gold(I) iodide AuI: 2 Au + 3 F 2 → Δ 2 AuF 3 {\displaystyle {\ce {2Au{}+3F2->[{} \atop \Delta ]2AuF3}}} 2 Au + 3 Cl 2 → Δ 2 AuCl 3 {\displaystyle {\ce {2Au{}+3Cl2->[{} \atop \Delta ]2AuCl3}}} 2 Au + 2 Br 2 → Δ AuBr 3 + AuBr {\displaystyle {\ce {2Au{}+2Br2->[{} \atop \Delta ]AuBr3{}+AuBr}}} 2 Au + I 2 → Δ 2 AuI {\displaystyle {\ce {2Au{}+I2->[{} \atop \Delta ]2AuI}}} Gold does not react with sulfur directly, but gold(III) sulfide can be made by passing hydrogen sulfide through
8928-532: The cove where the first British settlement was established Sydney Cove after Home Secretary Thomas Townshend, 1st Viscount Sydney . The cove was called Warrane by the Aboriginal inhabitants. Phillip considered naming the settlement Albion , but this name was never officially used. By 1790 Phillip and other officials were regularly calling the township Sydney. Sydney was declared a city in 1842. The Gadigal (Cadigal) clan, whose territory stretches along
9052-546: The demolition of buildings erected on Crown land, including some owned by past and serving military officers. The resulting conflict culminated in the Rum Rebellion of 1808, in which Bligh was deposed by the New South Wales Corps . Governor Lachlan Macquarie (1810–1821) played a leading role in the development of Sydney and New South Wales, establishing a bank, a currency and a hospital. He employed
9176-424: The densest element, osmium , is 22.588 ± 0.015 g/cm . Whereas most metals are gray or silvery white, gold is slightly 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
9300-689: The early 4th millennium. As of 1990, gold artifacts found at the Wadi Qana cave cemetery of the 4th millennium BC in West Bank were the earliest from the Levant. 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
9424-522: The emigration of free British settlers to New South Wales. Immigration to the colony increased from 900 free settlers in 1826–30 to 29,000 in 1836–40, many of whom settled in Sydney. By the 1840s Sydney exhibited a geographic divide between poor and working-class residents living west of the Tank Stream in areas such as The Rocks , and the more affluent residents living to its east. Free settlers, free-born residents and former convicts now represented
9548-488: The first century AD. Sydney Sydney is the capital city of the state of New South Wales and the most populous city in Australia . Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 80 km (50 mi) from the Pacific Ocean in the east to the Blue Mountains in the west, and about 80 km (50 mi) from the Ku-ring-gai Chase National Park and
9672-717: The first crops failed, leading to several years of hunger and strict rationing. The food crisis was relieved with the arrival of the Second Fleet in mid-1790 and the Third Fleet in 1791. Former convicts received small grants of land, and government and private farms spread to the more fertile lands around Parramatta , Windsor and Camden on the Cumberland Plain . By 1804, the colony was self-sufficient in food. A smallpox epidemic in April 1789 killed about half
9796-591: The first written reference to gold was recorded in the 12th Dynasty around 1900 BC. Egyptian hieroglyphs from as early as 2600 BC describe gold, which King Tushratta of the Mitanni claimed was "more plentiful than dirt" in Egypt. 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
9920-466: The fringes of the Sydney area. The first meeting between Aboriginals and British explorers occurred on 29 April 1770 when Lieutenant James Cook landed at Botany Bay (Kamay ) and encountered the Gweagal clan. Two Gweagal men opposed the landing party and one was shot and wounded. Cook and his crew stayed at Botany Bay for a week, collecting water, timber, fodder and botanical specimens and exploring
10044-403: The gold acts simply as a solute, this is not a chemical reaction . A relatively rare element, gold is a precious metal that has been used for coinage , jewelry , and other works of art throughout recorded history . In the past, a gold standard was often implemented as a monetary policy . Gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard
10168-700: The goldfields. Melbourne soon overtook Sydney as Australia's largest city, leading to an enduring rivalry between the two. However, increased immigration from overseas and wealth from gold exports increased demand for housing, consumer goods, services and urban amenities. The New South Wales government also stimulated growth by investing heavily in railways, trams, roads, ports, telegraph, schools and urban services. The population of Sydney and its suburbs grew from 95,600 in 1861 to 386,900 in 1891. The city developed many of its characteristic features. The growing population packed into rows of terrace houses in narrow streets. New public buildings of sandstone abounded, including at
10292-563: The highest electron affinity of any metal, at 222.8 kJ/mol, making Au a stable species, analogous to the halides . Gold also has a –1 oxidation state in covalent complexes with the group 4 transition metals, such as in titanium tetraauride and the analogous zirconium and hafnium compounds. These chemicals are expected to form gold-bridged dimers in a manner similar to titanium(IV) hydride . Gold(II) compounds are usually diamagnetic with Au–Au bonds such as [ Au(CH 2 ) 2 P(C 6 H 5 ) 2 ] 2 Cl 2 . The evaporation of
10416-505: The inland location, frost is recorded early in the morning in Western Sydney a few times in winter. Autumn and spring are the transitional seasons, with spring showing a larger temperature variation than autumn. Sydney experiences an urban heat island effect. This makes certain parts of the city more vulnerable to extreme heat, including coastal suburbs. In late spring and summer, temperatures over 35 °C (95 °F) are not uncommon, though hot, dry conditions are usually ended by
10540-611: The largest glass plate negatives produced in the nineteenth century. These were made in Holtermann's tower in 1875, and three are held in the Holtermann Collection at the State Library of New South Wales . Almost seventy years after Holtermann's death, more than 3,000 of the glass negatives created by Merlin and Bayliss were retrieved from a garden shed in the Sydney suburb of Chatswood. The UNESCO-listed collection of negatives, known as The Holtermann Collection ,
10664-505: The main body of insurgents were routed by about 100 troops and volunteers at Rouse Hill . At least 39 convicts were killed in the uprising and subsequent executions. As the colony spread to the more fertile lands around the Hawkesbury River , north-west of Sydney, conflict between the settlers and the Darug people intensified, reaching a peak from 1794 to 1810. Bands of Darug people, led by Pemulwuy and later by his son Tedbury , burned crops, killed livestock and raided settler stores in
10788-462: The metropolis. Manufacturing, protected by high tariffs, employed over a third of the workforce from 1945 to the 1960s. However, as the long post-war economic boom progressed, retail and other service industries became the main source of new jobs. An estimated one million onlookers, most of the city's population, watched Queen Elizabeth II land in 1954 at Farm Cove where Captain Phillip had raised
10912-547: The mineral quartz, and gold out of the fluids and onto nearby surfaces. 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/km ). 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), which
11036-525: The most expensive cities in the world, Sydney frequently ranks in the top ten most liveable cities . It is classified as an Alpha+ city by the Globalization and World Cities Research Network , indicating its influence in the region and throughout the world. Ranked eleventh in the world for economic opportunity, Sydney has an advanced market economy with strengths in education, finance, manufacturing and tourism . The University of Sydney and
11160-531: The most famous. The Nepean River wraps around the western edge of the city and becomes the Hawkesbury River before reaching Broken Bay . Most of Sydney's water storages can be found on tributaries of the Nepean River. The Parramatta River is mostly industrial and drains a large area of Sydney's western suburbs into Port Jackson. The southern parts of the city are drained by the Georges River and
11284-544: The most populous city in Australia. The government created jobs with massive public projects such as the electrification of the Sydney rail network and building the Sydney Harbour Bridge. Sydney was more severely affected by the Great Depression of the 1930s than regional New South Wales or Melbourne. New building almost came to a standstill, and by 1933 the unemployment rate for male workers
11408-617: The navy. The First Fleet of 11 ships under the command of Captain Arthur Phillip arrived in Botany Bay in January 1788. It comprised more than a thousand settlers, including 736 convicts. The fleet soon moved to the more suitable Port Jackson where a settlement was established at Sydney Cove on 26 January 1788. The colony of New South Wales was formally proclaimed by Governor Phillip on 7 February 1788. Sydney Cove offered
11532-411: The noble metals, 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 organophosphines . Au(I) compounds are typically linear. A good example is Au(CN) − 2 , which
11656-641: The older Hawkesbury sandstone is the Wianamatta shale , a geological feature found in western Sydney that was deposited in connection with a large river delta during the Middle Triassic . The Wianamatta shale generally comprises fine grained sedimentary rocks such as shales, mudstones , ironstones , siltstones and laminites , with less common sandstone units. The Wianamatta Group is made up of Bringelly Shale , Minchinbury Sandstone and Ashfield Shale . The most prevalent plant communities in
11780-569: The one hand, and storms and flooding on the other, associated with the opposite phases of the oscillation in Australia . The weather is moderated by proximity to the ocean, and more extreme temperatures are recorded in the inland western suburbs because Sydney CBD is more affected by the oceanic climate drivers than the western suburbs. At Sydney's primary weather station at Observatory Hill , extreme temperatures have ranged from 45.8 °C (114.4 °F) on 18 January 2013 to 2.1 °C (35.8 °F) on 22 June 1932. An average of 14.9 days
11904-576: 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 . Gold is mentioned in the Amarna letters numbered 19 and 26 from around the 14th century BC. Gold is mentioned frequently in
12028-464: The project. The 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 . The oldest gold artifacts in the world are from Bulgaria and are dating back to the 5th millennium BC (4,600 BC to 4,200 BC), such as those found in
12152-690: The r-process in the collision of neutron stars . In both cases, satellite spectrometers at first only indirectly detected the resulting gold. However, in August 2017, the spectroscopic signatures of heavy elements, including gold, were observed by electromagnetic observatories in the GW170817 neutron star merger event, after gravitational wave detectors confirmed the event as a neutron star merger. Current astrophysical models suggest that this single neutron star merger event generated between 3 and 13 Earth masses of gold. This amount, along with estimations of
12276-620: The rare bismuthide maldonite ( Au 2 Bi ) and antimonide aurostibite ( AuSb 2 ). Gold also occurs in rare alloys with copper , lead , and mercury : the minerals auricupride ( Cu 3 Au ), novodneprite ( AuPb 3 ) and weishanite ( (Au,Ag) 3 Hg 2 ). A 2004 research paper 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. A 2013 study has claimed water in faults vaporizes during an earthquake, depositing gold. When an earthquake strikes, it moves along
12400-420: The rate of occurrence of these neutron star merger events, suggests that such mergers may produce enough gold to account for most of the abundance of this element in the universe. 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, as hypothesized in one model, most of the gold in the Earth's crust and mantle
12524-935: The reaction. However, the ions are removed from the equilibrium by hydrochloric acid, forming AuCl − 4 ions, or chloroauric acid , thereby enabling further oxidation: 2 Au + 6 H 2 SeO 4 → 200 ∘ C Au 2 ( SeO 4 ) 3 + 3 H 2 SeO 3 + 3 H 2 O {\displaystyle {\ce {2Au{}+6H2SeO4->[{} \atop {200^{\circ }{\text{C}}}]Au2(SeO4)3{}+3H2SeO3{}+3H2O}}} Au + 4 HCl + HNO 3 ⟶ HAuCl 4 + NO ↑ + 2 H 2 O {\displaystyle {\ce {Au{}+4HCl{}+HNO3->HAuCl4{}+NO\uparrow +2H2O}}} Gold
12648-604: The region's Indigenous population. In November 1790 Bennelong led a group of survivors of the Sydney clans into the settlement, establishing a continuous presence of Aboriginal Australians in settled Sydney. Phillip had been given no instructions for urban development, but in July 1788 submitted a plan for the new town at Sydney Cove . It included a wide central avenue, a permanent Government House, law courts, hospital and other public buildings, but no provision for warehouses, shops, or other commercial buildings. Phillip promptly ignored his own plan, and unplanned development became
12772-473: The rest of the gold on Earth is thought to have been incorporated into the planet since its very beginning, as planetesimals formed the mantle . In 2017, an international group of scientists established that gold "came to the Earth's surface from the deepest regions of our planet", the mantle, as evidenced by their findings at Deseado Massif in the Argentinian Patagonia . On Earth, gold
12896-486: The same result and showing that the isotopes of gold produced by it were all radioactive . In 1980, Glenn Seaborg transmuted several thousand atoms of bismuth into gold at the Lawrence Berkeley Laboratory. Gold can be manufactured in a nuclear reactor, but doing so is highly impractical and would cost far more than the value of the gold that is produced. Although gold is the most noble of
13020-486: 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 . 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
13144-450: 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,
13268-519: The south-west. The local government area of the City of Sydney covers about 26 square kilometres from Garden island in the east to Bicentennial Park in the west, and south to the suburbs of Alexandria and Rosebery . Sydney is made up of mostly Triassic rock with some recent igneous dykes and volcanic necks (typically found in the Prospect dolerite intrusion , west of Sydney). The Sydney Basin
13392-534: The south. Sydney spans two geographic regions. The Cumberland Plain lies to the south and west of the Harbour and is relatively flat. The Hornsby Plateau is located to the north and is dissected by steep valleys. The flat areas of the south were the first to be developed; it was not until the construction of the Sydney Harbour Bridge that the northern reaches became more heavily populated. Seventy surf beaches can be found along its coastline, with Bondi Beach being
13516-497: The southern shore of Port Jackson from South Head to Darling Harbour , are the traditional owners of the land on which the British settlement was initially established, and call their territory Gadi ( Cadi ). Aboriginal clan names within the Sydney region were often formed by adding the suffix "-gal" to a word denoting the name for their territory, a specific place in their territory, a food source, or totem. Greater Sydney covers
13640-422: The stomach , cirrhosis of the liver and dropsy ", leaving a wife, three sons and two daughters. Gold Gold is a chemical element with the chemical symbol Au (from Latin aurum ) and atomic number 79. In its pure form, it is a bright , slightly orange-yellow, dense, soft, malleable , and ductile metal . Chemically, gold is a transition metal , a group 11 element , and one of
13764-533: The surrounding area. Cook sought to establish relations with the Aboriginal population without success. Britain had been sending convicts to its American colonies for most of the eighteenth century, and the loss of these colonies in 1783 was the impetus to establish a penal colony at Botany Bay. Proponents of colonisation also pointed to the strategic importance of a new base in the Asia-Pacific region and its potential to provide much-needed timber and flax for
13888-439: The temperature seem colder than it actually is . Rainfall has a moderate to low variability and has historically been fairly uniform throughout the year, although in recent years it has been more summer-dominant and erratic. Precipitation is usually higher in summer through to autumn, and lower in late winter to early spring. In late autumn and winter, east coast lows may bring large amounts of rainfall, especially in
14012-436: 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 some cases, gold has a fractional oxidation state. A representative example is the octahedral species {Au( P(C 6 H 5 ) 3 )} 2+ 6 . Gold
14136-509: The traditional lands of 28 known Aboriginal clans. The first people to inhabit the area now known as Sydney were Aboriginal Australians who had migrated from southeast Asia via northern Australia. Flaked pebbles found in Western Sydney's gravel sediments might indicate human occupation from 45,000 to 50,000 years ago, while radiocarbon dating has shown evidence of human activity in the region from around 30,000 years ago. Prior to
14260-403: 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. An American team, working without knowledge of Nagaoka's prior study, conducted the same experiment in 1941, achieving
14384-480: The vast majority of the population of Sydney, leading to increasing public agitation for responsible government and an end to transportation. Transportation to New South Wales ceased in 1840. In 1804, Irish convicts led around 300 rebels in the Castle Hill Rebellion , an attempt to march on Sydney, commandeer a ship, and sail to freedom. Poorly armed, and with their leader Philip Cunningham captured,
14508-417: The visors of heat-resistant suits and in sun visors for spacesuits . Gold is a good conductor of heat and electricity . Gold has a density of 19.3 g/cm , almost identical to that of tungsten at 19.25 g/cm ; as such, tungsten has been used in the counterfeiting of gold bars , such as by plating a tungsten bar with gold. By comparison, the density of lead is 11.34 g/cm , and that of
14632-668: The wealth to build a mansion in North Sydney. Holtermann was born in Hamburg , Germany . He emigrated in 1858 to avoid Prussian military service. He departed Liverpool aboard the ship Salem and reached Melbourne in August after a journey lasting 101 days. After working at a variety of jobs, he teamed up with Ludwig Hugo 'Louis' Beyers . They began prospecting around Hill End , New South Wales. Years of unrewarding labour followed. On 22 February 1868, Holtermann married Harriett Emmett, while Beyers married her sister Mary. In 1871,
14756-401: Was 28 per cent, but over 40 per cent in working class areas such as Alexandria and Redfern. Many families were evicted from their homes and shanty towns grew along coastal Sydney and Botany Bay, the largest being "Happy Valley" at La Perouse . The Depression also exacerbated political divisions. In March 1932, when populist Labor premier Jack Lang attempted to open the Sydney Harbour Bridge he
14880-787: Was abandoned for a fiat currency system after the Nixon shock measures of 1971. In 2020, the world's largest gold producer was China, followed by Russia and Australia. As of 2020 , a total of around 201,296 tonnes of gold exist above ground. This is equal to a cube, with each side measuring roughly 21.7 meters (71 ft). The world's consumption of new gold produced is about 50% in jewelry, 40% in investments , and 10% in industry . Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, as well as 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
15004-411: Was also controversial for its cost and disputes between architect Jørn Utzon and government officials. However, soon after it opened in 1973 it became a major tourist attraction and symbol of the city. The progressive reduction in tariff protection from 1974 began the transformation of Sydney from a manufacturing centre to a "world city". From the 1980s, overseas immigration grew rapidly, with Asia ,
15128-514: Was formed in the early Triassic period. The sand that was to become the sandstone of today was laid down between 360 and 200 million years ago. The sandstone has shale lenses and fossil riverbeds. The Sydney Basin bioregion includes coastal features of cliffs, beaches, and estuaries. Deep river valleys known as rias were carved during the Triassic period in the Hawkesbury sandstone of
15252-621: 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 (190 mi) 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. Much of
15376-550: Was upstaged by Francis de Groot of the far-right New Guard , who slashed the ribbon with a sabre. In January 1938, Sydney celebrated the Empire Games and the sesquicentenary of European settlement in Australia. One journalist wrote, "Golden beaches. Sun tanned men and maidens...Red-roofed villas terraced above the blue waters of the harbour...Even Melbourne seems like some grey and stately city of Northern Europe compared with Sydney's sub-tropical splendours." A congress of
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