90-617: The Nevis River is in Otago , New Zealand . It flows north for 40 kilometres (25 mi) through rough country before meeting the Kawarau River , of which it is a tributary . A prominent rock outcrop close to this junction is known as the Nevis Bluff . The river was one of the sites of the Otago gold rush of the 1860s. Today, the region around the river is known for tourism and wine production . New Zealand's highest bungy jumping operation,
180-503: A combustible black or brownish-black sedimentary rock , formed as rock strata called coal seams . Coal is mostly carbon with variable amounts of other elements , chiefly hydrogen , sulfur , oxygen , and nitrogen . Coal is a type of fossil fuel , formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of
270-512: A cyclothem . Cyclothems are thought to have their origin in glacial cycles that produced fluctuations in sea level , which alternately exposed and then flooded large areas of continental shelf. The woody tissue of plants is composed mainly of cellulose, hemicellulose, and lignin. Modern peat is mostly lignin, with a content of cellulose and hemicellulose ranging from 5% to 40%. Various other organic compounds, such as waxes and nitrogen- and sulfur-containing compounds, are also present. Lignin has
360-439: A Labour stronghold. Since 2008 the rest of Otago has been divided between the large rural electorates of Waitaki , which also includes some of the neighbouring Canterbury Region , and Clutha-Southland , which also includes most of the rural part of the neighbouring Southland Region. The Waitaki electorate has traditionally been a National Party stronghold and is currently held by Miles Anderson . The Southland electorate, also
450-635: A National Party stronghold, is currently represented by Joseph Mooney . The earlier Otago electorate existed from 1978 to 2008, when it was split and merged into Waitaki and Clutha-Southland. Two list MPs are based in Dunedin – Michael Woodhouse of the National Party and Rachel Brooking of the Labour Party. One-time Labour Party Deputy Leader David Parker is a former MP for the Otago electorate and currently
540-453: A Presbyterian girls' and boys' school in the city. Unlike other major cities in New Zealand, Dunedin does not have any private intermediate or high schools, as all remaining private intermediate and high schools have been integrated into the state system. 45°52′50″S 170°29′46″E / 45.88056°S 170.49611°E / -45.88056; 170.49611 Coal Coal is
630-421: A high incidence of feldspar . Fossils of the late and middle Triassic Warepan and Kaihikuan stages are found in the area. Weather conditions vary enormously across Otago, but can be broken into two broad types: the coastal climate of the coastal regions and the more continental climate of the interior. Coastal regions of Otago are subject to the alternating warm and dry/cool and wet weather patterns common to
720-524: A list MP. Under the Māori electorates system, Otago is also part of the large Te Tai Tonga electorate, which covers the entire South Island and surrounding islands, and is currently held by Te Pāti Māori Party MP Tākuta Ferris . Three of the 18 Ngāi Tahu Rūnanga (councils) are based in the Otago Region. Each one is centred on a coastal marae, namely Ōtākou , Moeraki and Puketeraki at Karitane . There
810-560: A mixed economy. Dunedin is home to manufacturing, publishing and technology-based industries. Rural economies have been reinvigorated in the 1990s and 2000s: in Clutha district, farms have been converted from sheep to more lucrative dairying. Vineyard planting and production remained modest until the middle of the 1990s when the New Zealand wine industry began to expand rapidly. The Central Otago wine region produces wine made from varieties such as
900-417: A process called carbonization . Carbonization proceeds primarily by dehydration , decarboxylation , and demethanation. Dehydration removes water molecules from the maturing coal via reactions such as Decarboxylation removes carbon dioxide from the maturing coal: while demethanation proceeds by reaction such as In these formulas, R represents the remainder of a cellulose or lignin molecule to which
990-477: A small influx at this time. The early and middle years of the twentieth century saw smaller influxes of immigrants from several mainland European countries, most notably the Netherlands . In line with the region's Scottish heritage, Presbyterianism is the largest Christian denomination with 17.1 percent affiliating, while Catholicism is the second-largest denomination with 11.5 percent affiliating. The seat of
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#17328582573341080-440: A special character based on a religious or philosophical belief that has been integrated into the state system, but still charge "attendance dues" to cover the building and maintenance of school buildings. These schools are not owned by the government, but otherwise they like state schools cannot charge fees for tuition of domestic students but may request a donation. As Dunedin was founded by Presbyterian Scottish settlers there are
1170-658: A special tribunal and the Environment Court, the Environment Minister decided to prevent damming of the river. Nokomai patterned mire , in the upper catchment, is part of a relatively unmodified wetland on several square kilometres of the southern Garvie Mountains. It is possibly the largest such area in Australasia and is dominated by grasses, sedges and mosses, with shallow pools, small islands and clumps of low vegetation. The mire drains north via Roaring Lion Creek to
1260-527: A switch in fuels happened in London in the late sixteenth and early seventeenth centuries. Historian Ruth Goodman has traced the socioeconomic effects of that switch and its later spread throughout Britain and suggested that its importance in shaping the industrial adoption of coal has been previously underappreciated. The development of the Industrial Revolution led to the large-scale use of coal, as
1350-549: A tenth. Indonesia and Australia export the most, followed by Russia . The word originally took the form col in Old English , from reconstructed Proto-Germanic * kula ( n ), from Proto-Indo-European root * g ( e ) u-lo- "live coal". Germanic cognates include the Old Frisian kole , Middle Dutch cole , Dutch kool , Old High German chol , German Kohle and Old Norse kol . Irish gual
1440-721: A third of its electricity . Some iron and steel -making and other industrial processes burn coal. The extraction and burning of coal damages the environment , causing premature death and illness, and it is the largest anthropogenic source of carbon dioxide contributing to climate change . Fourteen billion tonnes of carbon dioxide were emitted by burning coal in 2020, which is 40% of total fossil fuel emissions and over 25% of total global greenhouse gas emissions . As part of worldwide energy transition , many countries have reduced or eliminated their use of coal power . The United Nations Secretary General asked governments to stop building new coal plants by 2020. Global coal use
1530-403: A weight basis. This composition reflects partly the composition of the precursor plants. The second main fraction of coal is ash, an undesirable, noncombustable mixture of inorganic minerals. The composition of ash is often discussed in terms of oxides obtained after combustion in air: Of particular interest is the sulfur content of coal, which can vary from less than 1% to as much as 4%. Most of
1620-406: A weight composition of about 54% carbon, 6% hydrogen, and 30% oxygen, while cellulose has a weight composition of about 44% carbon, 6% hydrogen, and 49% oxygen. Bituminous coal has a composition of about 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur, on a weight basis. The low oxygen content of coal shows that coalification removed most of the oxygen and much of the hydrogen
1710-571: Is a region of New Zealand located in the southern half of the South Island administered by the Otago Regional Council . It has an area of approximately 32,000 square kilometres (12,000 sq mi), making it the country's second largest local government region. Its population was 257,200 in June 2024. The name "Otago" is the local southern Māori dialect pronunciation of " Ōtākou ",
1800-625: Is also a cognate via the Indo-European root. The conversion of dead vegetation into coal is called coalification . At various times in the geologic past, the Earth had dense forests in low-lying areas. In these wetlands, the process of coalification began when dead plant matter was protected from oxidation , usually by mud or acidic water, and was converted into peat . The resulting peat bogs , which trapped immense amounts of carbon, were eventually deeply buried by sediments. Then, over millions of years,
1890-614: Is also the Arai Te Uru Marae in Dunedin. The subnational gross domestic product (GDP) of Otago was estimated at NZ$ 14.18 billion in the year to March 2020, 4.38% of New Zealand's national GDP. The regional GDP per capita was estimated at $ 58,353 in the same period. In the year to March 2018, primary industries contributed $ 1.25 billion (9.8%) to the regional GDP, goods-producing industries contributed $ 2.38 billion (18.6%), service industries contributed $ 8.05 billion (63.0%), and taxes and duties contributed $ 1.10 billion (8.6%). Otago has
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#17328582573341980-429: Is burned in a turbine). Hot exhaust gases from the turbine are used to raise steam in a heat recovery steam generator which powers a supplemental steam turbine . The overall plant efficiency when used to provide combined heat and power can reach as much as 94%. IGCC power plants emit less local pollution than conventional pulverized coal-fueled plants. Other ways to use coal are as coal-water slurry fuel (CWS), which
2070-594: Is entirely vertical; however, metamorphism may cause lateral changes of rank, irrespective of depth. For example, some of the coal seams of the Madrid, New Mexico coal field were partially converted to anthracite by contact metamorphism from an igneous sill while the remainder of the seams remained as bituminous coal. The earliest recognized use is from the Shenyang area of China where by 4000 BC Neolithic inhabitants had begun carving ornaments from black lignite. Coal from
2160-455: Is made when metallurgical coal (also known as coking coal ) is baked in an oven without oxygen at temperatures as high as 1,000 °C, driving off the volatile constituents and fusing together the fixed carbon and residual ash. Metallurgical coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace . The carbon monoxide produced by its combustion reduces hematite (an iron oxide ) to iron. Pig iron , which
2250-409: Is more abundant, and anthracite. The % carbon in coal follows the order anthracite > bituminous > lignite > brown coal. The fuel value of coal varies in the same order. Some anthracite deposits contain pure carbon in the form of graphite . For bituminous coal, the elemental composition on a dry, ash-free basis of 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur, on
2340-399: Is part of the reason why Central Otago vineyards are successful in this region. This inland region is one of the driest regions in the country, sheltered from prevailing rain-bearing weather conditions by the high mountains to the west and hills of the south. Summers can be hot, with temperatures often approaching or exceeding 30 degrees Celsius; winters, by contrast, are often bitterly cold –
2430-452: Is used as fuel. 27.6% of world energy was supplied by coal in 2017 and Asia used almost three-quarters of it. Other large-scale applications also exist. The energy density of coal is roughly 24 megajoules per kilogram (approximately 6.7 kilowatt-hours per kg). For a coal power plant with a 40% efficiency, it takes an estimated 325 kg (717 lb) of coal to power a 100 W lightbulb for one year. In 2022, 68% of global coal use
2520-691: The Bronze Age (3000–2000 BC), where it formed part of funeral pyres . In Roman Britain , with the exception of two modern fields, "the Romans were exploiting coals in all the major coalfields in England and Wales by the end of the second century AD". Evidence of trade in coal, dated to about AD 200, has been found at the Roman settlement at Heronbridge , near Chester ; and in the Fenlands of East Anglia , where coal from
2610-512: The Fushun mine in northeastern China was used to smelt copper as early as 1000 BC. Marco Polo , the Italian who traveled to China in the 13th century, described coal as "black stones ... which burn like logs", and said coal was so plentiful, people could take three hot baths a week. In Europe, the earliest reference to the use of coal as fuel is from the geological treatise On Stones (Lap. 16) by
2700-590: The Midlands was transported via the Car Dyke for use in drying grain. Coal cinders have been found in the hearths of villas and Roman forts , particularly in Northumberland , dated to around AD 400. In the west of England, contemporary writers described the wonder of a permanent brazier of coal on the altar of Minerva at Aquae Sulis (modern day Bath ), although in fact easily accessible surface coal from what became
2790-549: The Ngāi Tahu iwi or tribe. Other significant ethnic minorities include Asians, Pacific Islanders, Africans, Latin Americans and Middle Easterners. Otago's early waves of settlement, especially during and immediately after the gold rush of the 1860s, included a substantial minority of southern ( Guangdong ) Chinese settlers, and a smaller but also prominent number of people from Lebanon . The region's Jewish population also experienced
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2880-539: The Pinot noir , Chardonnay , Sauvignon blanc , Merlot and Riesling grapes. It has an increasing reputation as New Zealand's leading Pinot noir region. Otago has numerous rural primary schools, several small town primary and secondary schools, and some larger schools in Dunedin . Most are state schools which do not charge tuition, except for international students. Some are state integrated schools, former private schools with
2970-702: The Somerset coalfield was in common use in quite lowly dwellings locally. Evidence of coal's use for iron -working in the city during the Roman period has been found. In Eschweiler , Rhineland , deposits of bituminous coal were used by the Romans for the smelting of iron ore . No evidence exists of coal being of great importance in Britain before about AD 1000, the High Middle Ages . Coal came to be referred to as "seacoal" in
3060-576: The University of Otago , was founded in 1869 as the provincial university in Dunedin. The Province of Southland separated from Otago Province and set up its own Provincial Council at Invercargill in 1861. After difficulties ensued, Otago re-absorbed it in 1870. Its territory is included in the southern region of the old Otago Province which is named after it and is now the territory of the Southland region. The provincial governments were abolished in 1876 when
3150-491: The coal gap in the Permian–Triassic extinction event , where coal is rare. Favorable geography alone does not explain the extensive Carboniferous coal beds. Other factors contributing to rapid coal deposition were high oxygen levels, above 30%, that promoted intense wildfires and formation of charcoal that was all but indigestible by decomposing organisms; high carbon dioxide levels that promoted plant growth; and
3240-444: The steam engine took over from the water wheel . In 1700, five-sixths of the world's coal was mined in Britain. Britain would have run out of suitable sites for watermills by the 1830s if coal had not been available as a source of energy. In 1947 there were some 750,000 miners in Britain, but the last deep coal mine in the UK closed in 2015. A grade between bituminous coal and anthracite
3330-429: The 134-metre (440 ft) Nevis Highwire is above the river. A Water Conservation Order protects the river for its wild and scenic character and for recreational use, especially fishing and kayaking. The Water Conservation Order made provision for damming the river for hydro-electric development. Fish and Game New Zealand applied to have this provision revoked and in 2013, after a public process with consideration by
3420-407: The 13th century; the wharf where the material arrived in London was known as Seacoal Lane, so identified in a charter of King Henry III granted in 1253. Initially, the name was given because much coal was found on the shore, having fallen from the exposed coal seams on cliffs above or washed out of underwater coal outcrops, but by the time of Henry VIII , it was understood to derive from the way it
3510-559: The Abolition of the Provinces Act came into force on 1 November 1876, and were replaced by other forms of local authority, including counties. Two in Otago were named after the Scottish independence heroes Wallace and Bruce . From this time the national limelight gradually shifted northwards. Otago's flag was chosen from a 2004 competition. It was designed by Gregor Macauly. Beginning in
3600-578: The Carboniferous, and suggested that climatic and tectonic factors were a more plausible explanation, reconstruction of ancestral enzymes by phylogenetic analysis corroborated a hypothesis that lignin degrading enzymes appeared in fungi approximately 200 MYa. One likely tectonic factor was the Central Pangean Mountains , an enormous range running along the equator that reached its greatest elevation near this time. Climate modeling suggests that
3690-587: The Central Pangean Mountains contributed to the deposition of vast quantities of coal in the late Carboniferous. The mountains created an area of year-round heavy precipitation, with no dry season typical of a monsoon climate. This is necessary for the preservation of peat in coal swamps. Coal is known from Precambrian strata, which predate land plants. This coal is presumed to have originated from residues of algae. Sometimes coal seams (also known as coal beds) are interbedded with other sediments in
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3780-407: The Earth's tropical land areas during the late Carboniferous ( Pennsylvanian ) and Permian times. Coal is used primarily as a fuel. While coal has been known and used for thousands of years, its usage was limited until the Industrial Revolution . With the invention of the steam engine , coal consumption increased. In 2020, coal supplied about a quarter of the world's primary energy and over
3870-563: The Greek scientist Theophrastus (c. 371–287 BC): Among the materials that are dug because they are useful, those known as anthrakes [coals] are made of earth, and, once set on fire, they burn like charcoal [anthrakes]. They are found in Liguria ;... and in Elis as one approaches Olympia by the mountain road; and they are used by those who work in metals. Outcrop coal was used in Britain during
3960-860: The Murihiku terrane , an accretion which extends inland through the Hokonui Hills in the Southland region. This itself forms part of a larger system known as the Southland Syncline , which links to similar formations in Nelson (offset by the Alpine Fault ) and even in New Caledonia , 3,500 km (2,200 mi) away. The Catlins ranges are strike ridges composed of Triassic and Jurassic sandstones , mudstones and other related sedimentary rocks, often with
4050-617: The Nevis and south via Dome Burn to the Waikaia River . A small part of the mire is in the Nokomai catchment. 45°04′S 169°02′E / 45.067°S 169.033°E / -45.067; 169.033 This article about a river in the Otago region is a stub . You can help Misplaced Pages by expanding it . Otago Otago ( / ə ˈ t ɑː ɡ oʊ / , / oʊ -, ɒ -/ ; Māori : Ōtākou [ɔːˈtaːkou] )
4140-617: The Otago Regional Council is in Dunedin. The council is chaired by Andrew Noone as of July 2021 . There are five territorial authorities in Otago: Otago is represented by four parliamentary electorates . Dunedin and nearby towns are represented by the Dunedin electorate, held by Rachel Brooking , and the Taieri electorate, occupied by Ingrid Leary . Both MPs are members of the Labour Party, and Dunedin has traditionally been
4230-608: The block mountains impede and dilute the effects of the Nor'wester . The main Central Otago centres, such as Alexandra and Cromwell , are found in the intermontane basins between the block mountains. The schist bedrock influence extends to the eastern part of Otago, where remnant volcanics mark its edge. The remains of the most spectacular of these are the Miocene volcanics centred on Otago Harbour . Elsewhere, basalt outcrops can be found along
4320-586: The broad high valley of the Strath-Taieri in its upper reaches, and the fertile Taieri Plains as it approaches the ocean. Travelling east from the mountains, the Central Otago drylands predominate. These are Canterbury-Otago tussock grasslands dominated by the block mountains, upthrust schist mountains. In contrast to Canterbury, where the Northwest winds blow across the plains without interruption, in Otago
4410-425: The census question. Of those at least 15 years old, 40,458 (19.9%) people had a bachelor's or higher degree, 106,080 (52.2%) had a post-high school certificate or diploma, and 43,974 (21.6%) people exclusively held high school qualifications. The median income was $ 39,100, compared with $ 41,500 nationally. 19,692 people (9.7%) earned over $ 100,000 compared to 12.1% nationally. The employment status of those at least 15
4500-619: The coast and at other sites. Comparatively similar terrain exists in the high plateau land of the Maniototo Plain , which lies to the east of Central Otago, close to the upper reaches of the Taieri River. This area is sparsely populated, but of historical note for its importance during the Otago gold rush of the 1860s. The townships of Ranfurly and Naseby lie in this area. In the southeastern corner of Otago lies The Catlins , an area of rough hill country which geologically forms part of
4590-462: The country from the southwest. A common variant in this pattern is the centring of a stationary low-pressure zone to the southeast of the country, resulting in long-lasting cool, wet conditions. These have been responsible for several notable historical floods, such as the "hundred year floods" of October 1878 and October 1978. Typically, winters are cool and wet in the extreme south areas and snow can fall and settle to sea level in winter, especially in
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#17328582573344680-447: The country's hydroelectric power. Vineyards and wineries have been developed in the Central Otago wine region . Some parts of the area originally covered by Otago Province are now administered by either Canterbury Regional Council or Southland Regional Council . Like the rest of mainland New Zealand, Otago was first settled by the Māori people . Most of the Māori settlement in Otago
4770-430: The evolution of the first trees . But bacteria and fungi did not immediately evolve the ability to decompose lignin, so the wood did not fully decay but became buried under sediment, eventually turning into coal. About 300 million years ago, mushrooms and other fungi developed this ability, ending the main coal-formation period of earth's history. Although some authors pointed at some evidence of lignin degradation during
4860-512: The factors involved in coalification, temperature is much more important than either pressure or time of burial. Subbituminous coal can form at temperatures as low as 35 to 80 °C (95 to 176 °F) while anthracite requires a temperature of at least 180 to 245 °C (356 to 473 °F). Although coal is known from most geologic periods , 90% of all coal beds were deposited in the Carboniferous and Permian periods. Paradoxically, this
4950-620: The focus of the Otago Association , an offshoot of the Free Church of Scotland , notable for its adoption of the principle that ordinary people, not the landowner, should choose the ministers. Major centres include Dunedin (the principal city), Oamaru , Balclutha , Alexandra , and the major tourist centres Queenstown and Wānaka . Kaitangata in South Otago is a prominent source of coal . The Waitaki and Clutha rivers provide much of
5040-498: The form of iron pyrite (FeS 2 ). Being a dense mineral, it can be removed from coal by mechanical means, e.g. by froth flotation . Some sulfate occurs in coal, especially weathered samples. It is not volatilized and can be removed by washing. Minor components include: As minerals, Hg, As, and Se are not problematic to the environment, especially since they are only trace components. They become however mobile (volatile or water-soluble) when these minerals are combusted. Most coal
5130-475: The heat and pressure of deep burial caused the loss of water, methane and carbon dioxide and increased the proportion of carbon. The grade of coal produced depended on the maximum pressure and temperature reached, with lignite (also called "brown coal") produced under relatively mild conditions, and sub-bituminous coal , bituminous coal , or anthracite coal (also called "hard coal" or "black coal") produced in turn with increasing temperature and pressure. Of
5220-412: The hills and plains of South Otago . More Central and Northern Coastal areas winter is sunnier and drier. Summers, by contrast, tend to be warm and dry, with temperatures often reaching the high 20s and low 30s Celsius. In Central Otago cold frosty winters are succeeded by hot dry summers. Central Otago's climate is the closest approximation to a continental climate anywhere in New Zealand. This climate
5310-431: The increasing tendency of the anthracite to break with a conchoidal fracture , similar to the way thick glass breaks. As geological processes apply pressure to dead biotic material over time, under suitable conditions, its metamorphic grade or rank increases successively into: There are several international standards for coal. The classification of coal is generally based on the content of volatiles . However
5400-514: The interannual Southern oscillation . The Southern Hemisphere storm track produces an irregular short cycle of weather which repeats roughly every week, with three or four days of fine weather followed by three or four days of cooler, damp conditions. Drier conditions are often the result of the northwesterly föhn wind, which dries as it crosses the Southern Alps . Wetter air is the result of approaching low-pressure systems which sweep fronts over
5490-453: The morphology and some properties of the original plant. In many coals, individual macerals can be identified visually. Some macerals include: In coalification huminite is replaced by vitreous (shiny) vitrinite . Maturation of bituminous coal is characterized by bitumenization , in which part of the coal is converted to bitumen , a hydrocarbon-rich gel. Maturation to anthracite is characterized by debitumenization (from demethanation) and
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#17328582573345580-405: The most important distinction is between thermal coal (also known as steam coal), which is burnt to generate electricity via steam; and metallurgical coal (also known as coking coal), which is burnt at high temperature to make steel . Hilt's law is a geological observation that (within a small area) the deeper the coal is found, the higher its rank (or grade). It applies if the thermal gradient
5670-568: The name of the Māori village near the entrance to Otago Harbour . The exact meaning of the term is disputed, with common translations being "isolated village" and "place of red earth", the latter referring to the reddish-ochre clay which is common in the area around Dunedin . "Otago" is also the old name of the European settlement on the harbour, established by the Weller Brothers in 1831, which lies close to Otakou . The upper harbour later became
5760-407: The nature of Carboniferous forests, which included lycophyte trees whose determinate growth meant that carbon was not tied up in heartwood of living trees for long periods. One theory suggested that about 360 million years ago, some plants evolved the ability to produce lignin , a complex polymer that made their cellulose stems much harder and more woody. The ability to produce lignin led to
5850-455: The number of double bonds between carbon). As carbonization proceeds, aliphatic compounds convert to aromatic compounds . Similarly, aromatic rings fuse into polyaromatic compounds (linked rings of carbon atoms). The structure increasingly resembles graphene , the structural element of graphite. Chemical changes are accompanied by physical changes, such as decrease in average pore size. The macerals are coalified plant parts that retain
5940-465: The office of provincial Superintendent after the New Zealand provinces were created in 1853. The Otago Province was the whole of New Zealand from the Waitaki River south, including Stewart Island and the sub-Antarctic islands. It included the territory of the later Southland Province and also the much more extensive lands of the modern Southland Region . Initial settlement was concentrated on
6030-529: The population of the Queenstown-Lakes District grew by 60% due to the region's booming tourism industry. Otago had a population of 240,900 in the 2023 New Zealand census , an increase of 15,714 people (7.0%) since the 2018 census , and an increase of 38,430 people (19.0%) since the 2013 census . There were 118,524 males, 121,185 females and 1,188 people of other genders in 94,425 dwellings. 4.3% of people identified as LGBTIQ+ . The median age
6120-691: The population resides in the Dunedin urban area—the region's main city and the country's sixth largest urban area. For historical and geographical reasons, Dunedin is usually regarded as one of New Zealand's four main centres. Unlike other southern centres, Dunedin's population has not declined since the 1970s, largely due to the presence of the University of Otago – and especially its medical school – which attracts students from all over New Zealand and overseas. Other significant urban centres in Otago with populations over 1,000 include: Queenstown , Oamaru , Wānaka , Port Chalmers , Cromwell , Alexandra , Balclutha , Milton and Mosgiel . Between 1996 and 2006,
6210-458: The port and city, then expanded, notably to the south-west, where the fertile Taieri Plains offered good farmland. The 1860s saw rapid commercial expansion after Gabriel Read discovered gold at Gabriel's Gully near Lawrence , and the Otago gold rush ensued. Veterans of goldfields in California and Australia, plus many other fortune-seekers from Europe, North America and China, poured into
6300-456: The pre-combustion treatment, turbine technology (e.g. supercritical steam generator ) and the age of the plant. A few integrated gasification combined cycle (IGCC) power plants have been built, which burn coal more efficiently. Instead of pulverizing the coal and burning it directly as fuel in the steam-generating boiler, the coal is gasified to create syngas , which is burned in a gas turbine to produce electricity (just like natural gas
6390-427: The reacting groups are attached. Dehydration and decarboxylation take place early in coalification, while demethanation begins only after the coal has already reached bituminous rank. The effect of decarboxylation is to reduce the percentage of oxygen, while demethanation reduces the percentage of hydrogen. Dehydration does both, and (together with demethanation) reduces the saturation of the carbon backbone (increasing
6480-511: The region's current official boundaries put much of that river's catchment in Canterbury . The country's fourth-longest river, the Taieri , also has both its source and outflow in Otago, rising from rough hill country and following a broad horseshoe-shaped path, north, then east, and finally southeast, before reaching the Pacific Ocean. Along its course it forms two notable geographic features –
6570-406: The sources of the Clutha / Matau-au, the largest river (by discharge) in New Zealand. The Clutha flows generally to the southeast through Otago and discharges near Balclutha . The river has been used for hydroelectric power generation, with large dams at Clyde and Roxburgh . The traditional northern boundary of the region, the Waitaki River , is also heavily utilised for hydroelectricity, though
6660-399: The sulfur and most of the nitrogen is incorporated into the organic fraction in the form of organosulfur compounds and organonitrogen compounds . This sulfur and nitrogen are strongly bound within the hydrocarbon matrix. These elements are released as SO 2 and NO x upon combustion. They cannot be removed, economically at least, otherwise. Some coals contain inorganic sulfur, mainly in
6750-518: The then Province of Otago, eroding its Scottish Presbyterian character. Further gold discoveries at Clyde and on the Arrow River around Arrowtown led to a boom, and Otago became for a period the cultural and economic centre of New Zealand. New Zealand's first daily newspaper, the Otago Daily Times , originally edited by Julius Vogel , dates from this period. New Zealand's first university,
6840-414: The township of Ranfurly in Central Otago holds the New Zealand record for lowest temperature with a reading of −25.6 °C on 18 July 1903. Otago Region covers 31,186.16 km (12,041.04 sq mi). The population is 257,200 as of June 2024, which is approximately 4.8 percent of New Zealand's total population of 5.3 million. The population density is 8.2 people per km . About 41.5 percent of
6930-679: The west, the geography of Otago consists of high alpine mountains. The highest peak in Otago (and highest outside the Aoraki / Mount Cook area) is Mount Aspiring / Tititea , which is on the Main Divide . From the high mountains the rivers discharge into large glacial lakes. In this part of Otago glacial activity – both recent and very old – dominates the landscape, with large U-shaped valleys and rivers which have high sediment loads. River flows also vary dramatically, with large flood flows occurring after heavy rain. Lakes Wakatipu , Wānaka , and Hāwea form
7020-415: The world's coal-generated electricity. Efforts around the world to reduce the use of coal have led some regions to switch to natural gas and renewable energy . In 2018 coal-fired power station capacity factor averaged 51%, that is they operated for about half their available operating hours. Coke is a solid carbonaceous residue that is used in manufacturing steel and other iron-containing products. Coke
7110-561: Was 38.4 years (compared with 38.1 years nationally). There were 37,749 people (15.7%) aged under 15 years, 53,532 (22.2%) aged 15 to 29, 106,926 (44.4%) aged 30 to 64, and 42,690 (17.7%) aged 65 or older. People could identify as more than one ethnicity. The results were 85.2% European ( Pākehā ); 9.9% Māori ; 3.4% Pasifika ; 8.5% Asian ; 2.2% Middle Eastern, Latin American and African New Zealanders (MELAA); and 2.7% other, which includes people giving their ethnicity as "New Zealander". English
7200-574: Was 8.3 billion tonnes in 2022, and is set to remain at record levels in 2023. To meet the Paris Agreement target of keeping global warming below 2 °C (3.6 °F) coal use needs to halve from 2020 to 2030, and "phasing down" coal was agreed upon in the Glasgow Climate Pact . The largest consumer and importer of coal in 2020 was China , which accounts for almost half the world's annual coal production, followed by India with about
7290-574: Was based on the trading of this commodity. Coal continues to arrive on beaches around the world from both natural erosion of exposed coal seams and windswept spills from cargo ships. Many homes in such areas gather this coal as a significant, and sometimes primary, source of home heating fuel. Coal consists mainly of a black mixture of diverse organic compounds and polymers. Of course, several kinds of coals exist, with variable dark colors and variable compositions. Young coals (brown coal, lignite) are not black. The two main black coals are bituminous, which
7380-504: Was carried to London by sea. In 1257–1259, coal from Newcastle upon Tyne was shipped to London for the smiths and lime -burners building Westminster Abbey . Seacoal Lane and Newcastle Lane, where coal was unloaded at wharves along the River Fleet , still exist. These easily accessible sources had largely become exhausted (or could not meet the growing demand) by the 13th century, when underground extraction by shaft mining or adits
7470-602: Was developed in the Soviet Union , or in an MHD topping cycle . However these are not widely used due to lack of profit. In 2017 38% of the world's electricity came from coal, the same percentage as 30 years previously. In 2018 global installed capacity was 2 TW (of which 1TW is in China) which was 30% of total electricity generation capacity. The most dependent major country is South Africa, with over 80% of its electricity generated by coal; but China alone generates more than half of
7560-408: Was developed. The alternative name was "pitcoal", because it came from mines. Cooking and home heating with coal (in addition to firewood or instead of it) has been done in various times and places throughout human history, especially in times and places where ground-surface coal was available and firewood was scarce, but a widespread reliance on coal for home hearths probably never existed until such
7650-490: Was during the Late Paleozoic icehouse , a time of global glaciation . However, the drop in global sea level accompanying the glaciation exposed continental shelves that had previously been submerged, and to these were added wide river deltas produced by increased erosion due to the drop in base level . These widespread areas of wetlands provided ideal conditions for coal formation. The rapid formation of coal ended with
7740-606: Was once known as "steam coal" as it was widely used as a fuel for steam locomotives . In this specialized use, it is sometimes known as "sea coal" in the United States. Small "steam coal", also called dry small steam nuts (DSSN), was used as a fuel for domestic water heating . Coal played an important role in industry in the 19th and 20th century. The predecessor of the European Union , the European Coal and Steel Community ,
7830-557: Was spoken by 97.5%, Māori language by 1.9%, Samoan by 0.6% and other languages by 11.9%. No language could be spoken by 1.7% (e.g. too young to talk). New Zealand Sign Language was known by 0.5%. The percentage of people born overseas was 23.8, compared with 28.8% nationally. Religious affiliations were 28.4% Christian , 1.0% Hindu , 0.8% Islam , 0.2% Māori religious beliefs , 0.7% Buddhist , 0.5% New Age , 0.1% Jewish , and 1.4% other religions. People who answered that they had no religion were 60.3%, and 6.6% of people did not answer
7920-413: Was that 101,514 (50.0%) people were employed full-time, 31,086 (15.3%) were part-time, and 4,848 (2.4%) were unemployed. The majority of the population of European lineage is of Scottish stock—the descendants of early Scottish settlers from the early 19th century. Other well-represented European groups include those of English, Irish, and Dutch descent. A large proportion of the Māori population are from
8010-798: Was upon the coast and centred around the Otago Peninsula . The Otago settlement, an outgrowth of the Free Church of Scotland , was founded in March 1848 with the arrival of the first two immigrant ships from Greenock on the Firth of Clyde — the John Wickliffe and the Philip Laing . Captain William Cargill , a veteran of the Peninsular War , was the secular leader. Otago citizens subsequently elected him to
8100-430: Was used for electricity generation. Coal burnt in coal power stations to generate electricity is called thermal coal . It is usually pulverized and then burned in a furnace with a boiler . The furnace heat converts boiler water to steam , which is then used to spin turbines which turn generators and create electricity. The thermodynamic efficiency of this process varies between about 25% and 50% depending on
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