Luanshya is a town in Zambia , in the Copperbelt Province near Ndola . It has a population of 117,579 (2008 census). The town is situated in an area which was under Chief Mushili of the Lamba people.
70-516: Luanshya was founded in the early part of the 20th century after two prospector/explorer, William Collier shot and killed a Roan Antelope on the banks of the Luanshya River, discovering a copper deposit in the process. The antelope fell to the ground, its head resting on a rock where an exposed seam of copper ore was visible. The mining company eventually formed to exploit Collier's find was named " Roan Antelope Copper Mines Ltd". For most of
140-579: A Gilman reagent . These can undergo substitution with alkyl halides to form coupling products ; as such, they are important in the field of organic synthesis . Copper(I) acetylide is highly shock-sensitive but is an intermediate in reactions such as the Cadiot–Chodkiewicz coupling and the Sonogashira coupling . Conjugate addition to enones and carbocupration of alkynes can also be achieved with organocopper compounds. Copper(I) forms
210-696: A covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice , such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is usually supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms. The softness of copper partly explains its high electrical conductivity ( 59.6 × 10 S /m ) and high thermal conductivity, second highest (second only to silver) among pure metals at room temperature. This
280-643: A nickel ) consists of 75% copper and 25% nickel in homogeneous composition. Prior to the introduction of cupronickel, which was widely adopted by countries in the latter half of the 20th century, alloys of copper and silver were also used, with the United States using an alloy of 90% silver and 10% copper until 1965, when circulating silver was removed from all coins with the exception of the half dollar—these were debased to an alloy of 40% silver and 60% copper between 1965 and 1970. The alloy of 90% copper and 10% nickel, remarkable for its resistance to corrosion,
350-407: A pinkish-orange color . Copper is used as a conductor of heat and electricity, as a building material , and as a constituent of various metal alloys , such as sterling silver used in jewelry , cupronickel used to make marine hardware and coins , and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in
420-425: A spin of 3 ⁄ 2 . The other isotopes are radioactive , with the most stable being Cu with a half-life of 61.83 hours. Seven metastable isomers have been characterized; Cu is the longest-lived with a half-life of 3.8 minutes. Isotopes with a mass number above 64 decay by β , whereas those with a mass number below 64 decay by β . Cu , which has
490-399: A blast furnace. A potential source of copper is polymetallic nodules, which have an estimated concentration 1.3%. Like aluminium , copper is recyclable without any loss of quality, both from raw state and from manufactured products. In volume, copper is the third most recycled metal after iron and aluminium. An estimated 80% of all copper ever mined is still in use today. According to
560-464: A blue crystalline penta hydrate , the most familiar copper compound in the laboratory. It is used in a fungicide called the Bordeaux mixture . Polyols , compounds containing more than one alcohol functional group , generally interact with cupric salts. For example, copper salts are used to test for reducing sugars . Specifically, using Benedict's reagent and Fehling's solution the presence of
630-709: A directly usable metallic form ( native metals ). This led to very early human use in several regions, from c. 8000 BC . Thousands of years later, it was the first metal to be smelted from sulfide ores, c. 5000 BC ; the first metal to be cast into a shape in a mold, c. 4000 BC ; and the first metal to be purposely alloyed with another metal, tin , to create bronze , c. 3500 BC . Commonly encountered compounds are copper(II) salts, which often impart blue or green colors to such minerals as azurite , malachite , and turquoise , and have been used widely and historically as pigments. Copper used in buildings, usually for roofing, oxidizes to form
700-457: A green patina of compounds called verdigris . Copper is sometimes used in decorative art , both in its elemental metal form and in compounds as pigments. Copper compounds are used as bacteriostatic agents , fungicides , and wood preservatives . Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase . In molluscs and crustaceans , copper
770-505: A half-life of 12.7 hours, decays both ways. Cu and Cu have significant applications. Cu is used in Cu Cu-PTSM as a radioactive tracer for positron emission tomography . Copper is produced in massive stars and is present in the Earth's crust in a proportion of about 50 parts per million (ppm). In nature, copper occurs in
SECTION 10
#1732772375987840-458: A high rate of alcohol and substance abuse resulting in the newly sworn in government to close down numerous unlicensed pubs across the country. The current mayor of the city is Chola Magaret. He was born in 1975. Locally the town is headed by the Town Clerk and his executive council consisting of five directors: There is a 30-member council consisting of 28 elected members and 2 members from
910-687: A layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion ( passivation ). A green layer of verdigris (copper carbonate) can often be seen on old copper structures, such as the roofing of many older buildings and the Statue of Liberty . Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides . There are 29 isotopes of copper. Cu and Cu are stable, with Cu comprising approximately 69% of naturally occurring copper; both have
980-532: A natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air. This is due to the low plasma frequency of the metal, which lies in the red part of the visible spectrum, causing it to absorb the higher-frequency green and blue colors. As with other metals, if copper is put in contact with another metal in the presence of an electrolyte , galvanic corrosion will occur. Copper does not react with water, but it does slowly react with atmospheric oxygen to form
1050-407: A red-brown precipitate with copper(II) salts. Compounds that contain a carbon-copper bond are known as organocopper compounds. They are very reactive towards oxygen to form copper(I) oxide and have many uses in chemistry . They are synthesized by treating copper(I) compounds with Grignard reagents , terminal alkynes or organolithium reagents ; in particular, the last reaction described produces
1120-451: A rich variety of compounds, usually with oxidation states +1 and +2, which are often called cuprous and cupric , respectively. Copper compounds promote or catalyse numerous chemical and biological processes. As with other elements, the simplest compounds of copper are binary compounds, i.e. those containing only two elements, the principal examples being oxides, sulfides, and halides . Both cuprous and cupric oxides are known. Among
1190-414: A surprise stop over at the multimillion-dollar Mulyashi Mine Project only to be turned away by its Chinese employers. While the opening of the mines may have brought some social problems to Luanshya, employment rates have risen and revived the town. The population has been steadily increasing and more economic activities are visible such as the installation of a new Soya Solvent extraction plant, as well as
1260-424: A variety of minerals, including native copper , copper sulfides such as chalcopyrite , bornite , digenite , covellite , and chalcocite , copper sulfosalts such as tetrahedite-tennantite , and enargite , copper carbonates such as azurite and malachite , and as copper(I) or copper(II) oxides such as cuprite and tenorite , respectively. The largest mass of elemental copper discovered weighed 420 tonnes and
1330-436: A variety of weak complexes with alkenes and carbon monoxide , especially in the presence of amine ligands. Copper(III) is most often found in oxides. A simple example is potassium cuprate , KCuO 2 , a blue-black solid. The most extensively studied copper(III) compounds are the cuprate superconductors . Yttrium barium copper oxide (YBa 2 Cu 3 O 7 ) consists of both Cu(II) and Cu(III) centres. Like oxide, fluoride
1400-583: Is a constituent of the blood pigment hemocyanin , replaced by the iron-complexed hemoglobin in fish and other vertebrates . In humans, copper is found mainly in the liver, muscle, and bone. The adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. In the Roman era , copper was mined principally on Cyprus , the origin of the name of the metal, from aes cyprium (metal of Cyprus), later corrupted to cuprum (Latin). Coper ( Old English ) and copper were derived from this,
1470-405: Is a highly basic anion and is known to stabilize metal ions in high oxidation states. Both copper(III) and even copper(IV) fluorides are known, K 3 CuF 6 and Cs 2 CuF 6 , respectively. Some copper proteins form oxo complexes , which, in extensively studied synthetic analog systems, feature copper(III). With tetrapeptides , purple-colored copper(III) complexes are stabilized by
SECTION 20
#17327723759871540-401: Is because the resistivity to electron transport in metals at room temperature originates primarily from scattering of electrons on thermal vibrations of the lattice, which are relatively weak in a soft metal. The maximum possible current density of copper in open air is approximately 3.1 × 10 A/m , above which it begins to heat excessively. Copper is one of a few metallic elements with
1610-533: Is melted in a furnace and then reduced and cast into billets and ingots ; lower-purity scrap is refined by electroplating in a bath of sulfuric acid . The environmental cost of copper mining was estimated at 3.7 kg CO2eq per kg of copper in 2019. Codelco, a major producer in Chile, reported that in 2020 the company emitted 2.8t CO2eq per ton (2.8 kg CO2eq per kg) of fine copper. Greenhouse gas emissions primarily arise from electricity consumed by
1680-656: Is now called Central and Luanshya High School. There was Asoka Primary School for Asians, later named Gandhi, near the Second Class Trade area. For Africans there was Arusha Primary School in Mikomfwa, Mwaiseni in Mpatamatu and Fisansa in Roan townships. After independence, more schools were built. In Mikomfwa, new schools were Ndelela, East School now Twatemwa, West School now Muchinshi, Mipundu, Mikomfwa and Arusha
1750-444: Is one of the most important constituents of silver and karat gold solders used in the jewelry industry, modifying the color, hardness and melting point of the resulting alloys. Some lead-free solders consist of tin alloyed with a small proportion of copper and other metals. The alloy of copper and nickel , called cupronickel , is used in low-denomination coins, often for the outer cladding. The US five-cent coin (currently called
1820-437: Is recovered from mine tailings and heaps. A variety of methods are used including leaching with sulfuric acid, ammonia, ferric chloride. Biological methods are also used. A significant source of copper is from recycling. Recycling is facilitated because copper is usually deployed in its metallic state. In 2001, a typical automobile contained 20–30 kg of copper. Recycling usually begins with some melting process using
1890-411: Is used for various objects exposed to seawater, though it is vulnerable to the sulfides sometimes found in polluted harbors and estuaries. Alloys of copper with aluminium (about 7%) have a golden color and are used in decorations. Shakudō is a Japanese decorative alloy of copper containing a low percentage of gold, typically 4–10%, that can be patinated to a dark blue or black color. Copper forms
1960-686: The British Geological Survey , in 2005, Chile was the top producer of copper with at least one-third of the world share followed by the United States, Indonesia and Peru. Copper can also be recovered through the in-situ leach process. Several sites in the state of Arizona are considered prime candidates for this method. The amount of copper in use is increasing and the quantity available is barely sufficient to allow all countries to reach developed world levels of usage. An alternative source of copper for collection currently being researched are polymetallic nodules , which are located at
2030-607: The Great Lakes may have also been mining copper during this time, making it one of the oldest known examples of copper extraction in the world. There is evidence from prehistoric lead pollution from lakes in Michigan that people in the region began mining copper c. 6000 BC . Evidence suggests that utilitarian copper objects fell increasingly out of use in the Old Copper Complex of North America during
2100-553: The International Resource Panel 's Metal Stocks in Society report , the global per capita stock of copper in use in society is 35–55 kg. Much of this is in more-developed countries (140–300 kg per capita) rather than less-developed countries (30–40 kg per capita). The process of recycling copper is roughly the same as is used to extract copper but requires fewer steps. High-purity scrap copper
2170-726: The Neolithic period and the Bronze Age was formerly termed the Chalcolithic period (copper-stone), when copper tools were used with stone tools. The term has gradually fallen out of favor because in some parts of the world, the Chalcolithic and Neolithic are coterminous at both ends. Brass, an alloy of copper and zinc, is of much more recent origin. It was known to the Greeks, but became a significant supplement to bronze during
Luanshya - Misplaced Pages Continue
2240-525: The Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloys date to 3000 BC. Egyptian Blue , or cuprorivaite (calcium copper silicate) is a synthetic pigment that contains copper and started being used in ancient Egypt around 3250 BC. The manufacturing process of Egyptian blue was known to the Romans, but by the fourth century AD the pigment fell out of use and
2310-475: The 20th century, copper was mined in great quantities at Luanshya but towards the end of the century, mining there became increasingly uneconomic, causing a severe recession in the town. There is still a fair amount of copper underground. Whether the town sees a revival in its fortunes will depend on how efficiently the copper is extracted and sold. The city is the birthplace of folk singer, John Edmond , writer A. C. Grayling and former Vice President of Zambia ,
2380-548: The 9th or 10th century AD. Carbon dating has established mining at Alderley Edge in Cheshire , UK, at 2280 to 1890 BC. Ötzi the Iceman , a male dated from 3300 to 3200 BC, was found with an axe with a copper head 99.7% pure; high levels of arsenic in his hair suggest an involvement in copper smelting. Experience with copper has assisted the development of other metals; in particular, copper smelting likely led to
2450-517: The Bronze Age and a shift towards an increased production of ornamental copper objects occurred. Natural bronze, a type of copper made from ores rich in silicon, arsenic, and (rarely) tin, came into general use in the Balkans around 5500 BC. Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use. Bronze artifacts from
2520-493: The Copperbelt". This was largely due to the efforts of the late Bill and Doreen Altern, who initiated impressive public parks and gardens. Nowadays, the garden town has few social amenities for youths and mostly with dilapidated and neglected infrastructure. Kalussa laments that this has had a knock on effect on many youths who find themselves between the shocking levels of unemployment and poverty. Recently, Luanshya recorded
2590-705: The Indian run RAMCOZ. During the presidency of Levy Mwanawasa, the town was revived when Luanshya Copper Mines resumed full scale mining production and hired thousands of people, although that was to be short lived when the mining operator ran into financial problems. The mines were quickly taken over by a Chinese firm. The Chinese workforce has been accused of gross negligence and flouting Labour laws. In 2011 three Chinese workers were arrested for allegedly molesting local girls by taking advantage of their deprived economic status. Early in 2012, then Minister for Labour and Sport and area Member of Parliament Chishimba Kambwili made
2660-541: The Middle East; a copper pendant was found in northern Iraq that dates to 8700 BC. Evidence suggests that gold and meteoric iron (but not smelted iron) were the only metals used by humans before copper. The history of copper metallurgy is thought to follow this sequence: first, cold working of native copper, then annealing , smelting , and, finally, lost-wax casting . In southeastern Anatolia , all four of these techniques appear more or less simultaneously at
2730-415: The Roan seat. There have been however calls for a youth representation from the district, 21-year-old Law student and native of Luanshya, Kasabo Kalussa claims most youth's feel left out. Kalussa, the controversial rising politician and political blogger cites the astronomical unemployment levels as the reason why the local youths feel disenfranchised. In the 1960s, Luanshya was known as the "Garden Town of
2800-585: The Town is said to have been derived from the Luanshia mining claim. Three mining claims were named after antelopes, Rietbok , Roan Antelope and Luanshia Mining Claims . For those who are confused about the meaning of the name it is better to think of it in this manner "Once upon a time there was a river and stream which derived its name from the antelopes that would go to drink from there. Then some foreigners came and found some copper and started mining works on
2870-521: The affected areas is highly acidic, with a pH range of 2.1–4.9, and shows elevated electrical conductivity levels between 280 and 1561 mS/cm. These changes in water chemistry make the environment inhospitable for fish, essentially rendering the water uninhabitable for aquatic life. Numerous copper alloys have been formulated, many with important uses. Brass is an alloy of copper and zinc . Bronze usually refers to copper- tin alloys, but can refer to any alloy of copper such as aluminium bronze . Copper
Luanshya - Misplaced Pages Continue
2940-541: The atmosphere; 150 mg/kg in soil; 30 mg/kg in vegetation; 2 μg/L in freshwater and 0.5 μg/L in seawater. Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Sites include Chuquicamata , in Chile, Bingham Canyon Mine , in Utah, United States, and El Chino Mine , in New Mexico, United States. According to
3010-766: The beginning of the Neolithic c. 7500 BC . Copper smelting was independently invented in different places. The earliest evidence of lost-wax casting copper comes from an amulet found in Mehrgarh , Pakistan, and is dated to 4000 BC. Investment casting was invented in 4500–4000 BC in Southeast Asia Smelting was probably discovered in China before 2800 BC, in Central America around 600 AD, and in West Africa about
3080-531: The company, especially when sourced from fossil fuels, and from engines required for copper extraction and refinement. Companies that mine land often mismanage waste, rendering the area sterile for life. Additionally, nearby rivers and forests are also negatively impacted. The Philippines is an example of a region where land is overexploited by mining companies. Copper mining waste in Valea Şesei, Romania, has significantly altered nearby water properties. The water in
3150-522: The deprotonated amide ligands. Complexes of copper(III) are also found as intermediates in reactions of organocopper compounds, for example in the Kharasch–Sosnovsky reaction . A timeline of copper illustrates how this metal has advanced human civilization for the past 11,000 years. Copper occurs naturally as native metallic copper and was known to some of the oldest civilizations on record. The history of copper use dates to 9000 BC in
3220-461: The depths of the Pacific Ocean approximately 3000–6500 meters below sea level. These nodules contain other valuable metals such as cobalt and nickel . Copper has been in use for at least 10,000 years, but more than 95% of all copper ever mined and smelted has been extracted since 1900. As with many natural resources, the total amount of copper on Earth is vast, with around 10 tons in
3290-563: The discovery of iron smelting . Production in the Old Copper Complex in Michigan and Wisconsin is dated between 6500 and 3000 BC. A copper spearpoint found in Wisconsin has been dated to 6500 BC. Copper usage by the indigenous peoples of the Old Copper Complex from the Great Lakes region of North America has been radiometrically dated to as far back as 7500 BC. Indigenous peoples of North America around
3360-412: The extension of a well known milling company. The agricultural sector is growing as small scale farmers are increasing their crop outputs to cope with growing demand. Main crops that are harvested include maize , wheat , and soybeans . The town has three hospitals: Luanshya currently has two constituencies, Luanshya Central covers much of the urban area whilst Roan Constituency encompasses most of
3430-545: The fastest water exchange rate (speed of water ligands attaching and detaching) for any transition metal aquo complex . Adding aqueous sodium hydroxide causes the precipitation of light blue solid copper(II) hydroxide . A simplified equation is: Aqueous ammonia results in the same precipitate. Upon adding excess ammonia, the precipitate dissolves, forming tetraamminecopper(II) : Many other oxyanions form complexes; these include copper(II) acetate , copper(II) nitrate , and copper(II) carbonate . Copper(II) sulfate forms
3500-589: The land. In the style of the local chiefs, they also adopted the two animal totems and named their mine after the antelopes, roan being the mpelembe, nsha being the duiker. They amassed a lot of wealth from the mine and lived happily ever after." Luanshya is the home base of a Technical and Vocational Teacher's College (TVTC) from which a generation of the country's teachers in technical subjects have graduated. The town also has Luanshya Technical and Business College (LTBC) offering technical subjects to tertiary students. LTBC and TVTC are just separated by fence, and across
3570-657: The late George Kunda . The Roan Antelope Rugby Club in Luanshya formerly held the record for highest goal posts in the world, which were recognised by the Guinness Book of Records . They were 110 ft, 6 inches high. A popular myth is that there was a river snake which was held responsible for the floodings and deaths during the early development work at Roan Antelope Mine. Roan's workers suffered such high illness and mortality rates from malaria and blackwater fever, as well as from typhus, dysentery and pneumonia, that
SECTION 50
#17327723759873640-511: The later spelling first used around 1530. Copper, silver , and gold are in group 11 of the periodic table; these three metals have one s-orbital electron on top of a filled d- electron shell and are characterized by high ductility , and electrical and thermal conductivity. The filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds . Unlike metals with incomplete d-shells, metallic bonds in copper are lacking
3710-419: The level of <1% Cu. Concentration of the ore is required, which begins with comminution followed by froth flotation . The remaining concentrate is the smelted, which can be described with two simplified equations: Cuprous oxide reacts with cuprous sulfide to convert to blister copper upon heating This roasting gives matte copper, roughly 50% Cu by weight, which is purified by electrolysis. Depending on
3780-438: The mine had great difficulty keeping African laborers from one week to the next. It became common knowledge that the local Lamba attributed these problems to a giant snake, which wriggled along the river and mine shafts causing floodings and cave-ins, and spewing poisonous gas. By 1928, construction of the plant and township had begun soon after reserves of approximately 20 million tons of copper had been found. The flooding problem
3850-472: The modern world. The price of copper is volatile . After a peak in 2022 the price unexpectedly fell. The global market for copper is one of the most commodified and financialized of the commodity markets , and has been so for decades. The great majority of copper ores are sulfides. Common ores are the sulfides chalcopyrite (CuFeS 2 ), bornite (Cu 5 FeS 4 ) and, to a lesser extent, covellite (CuS) and chalcocite (Cu 2 S). These ores occur at
3920-601: The national Parliament. Luanshya Airport (ICAO: FLLA) is a small airstrip located in the eastern part of the town called Ndeke to mean "Air plane". The airstrip is not currently operational and consists of a rough unmarked 4,199 foot landing strip. A flying club is located at the airstrip. The town is accessible by an international airport, namely the Simon Mwansa Kapwepwe International Airport in Ndola approximately 28 kilometres to
3990-661: The north-east by road. Luanshya is at the end of an 8km spur road that comes off the T3 road ( Ndola - Kitwe Dual Carriageway). There are a few other roads that connect Luanshya to other parts of the Copperbelt Province (the M6 road connects east to Kafulafuta and another road connects south to Masaiti and Mpongwe). The Zambia Railways service to Luanshya was freight only, namely to service nearby copper mine with traffic to and from Ndola. The railway line from Luanshya to Ndola
4060-516: The numerous copper sulfides , important examples include copper(I) sulfide ( Cu 2 S ) and copper monosulfide ( CuS ). Cuprous halides with fluorine , chlorine , bromine , and iodine are known, as are cupric halides with fluorine , chlorine , and bromine . Attempts to prepare copper(II) iodide yield only copper(I) iodide and iodine. Copper forms coordination complexes with ligands . In aqueous solution, copper(II) exists as [Cu(H 2 O) 6 ] . This complex exhibits
4130-428: The ore, sometimes other metals are obtained during the electrolysis including platinum and gold. Aside from sulfides, another family of ores are oxides. Approximately 15% of the world's copper supply derives from these oxides. The beneficiation process for oxides involves extraction with sulfuric acid solutions followed by electrolysis. In parallel with the above method for "concentrated" sulfide and oxide ores, copper
4200-572: The peri-urban areas. For a long time, the town was a bastion for the fallen ruling party the Movement for Multy-Party democracy (MMD). However, during the wind of change that swept across the country in the last General Elections, the Patriotic Front notched up two important victories with popular businessman Steve Chungu riding on the party name elected as Lunshya Central M.P whilst outspoken Minister of Sport Chishimba Kambwili re-elected for
4270-532: The road to the West is Da Gama school, one of the only school on the Copperbelt Province for people with disabilities, is managed by nuns and named after the famous Portuguese explorer Vasco da Gama. Before Independence, schools were racially segregated, with separate schooling for Europeans, Asians, " Cape Coloureds " and Africans. There were two schools for white pupils: Luanshya Primary School which
SECTION 60
#17327723759874340-454: The roads are listed in alphabetical order so that A, B, C, D, E, F avenues are in alphabetical order and ran parallel with each other. The other groups of the alphabet are also grouped together in parallel lines H, G, J and l in a place called New Town although K, O, P, W avenue is right on the other side of town and ran parallel to N avenue. Folk singer John Edmond was born in Luanshya on 18 November 1936. Philosopher Anthony Clifford Grayling
4410-750: The secret to its manufacturing process became lost. The Romans said the blue pigment was made from copper, silica, lime and natron and was known to them as caeruleum . The Bronze Age began in Southeastern Europe around 3700–3300 BC, in Northwestern Europe about 2500 BC. It ended with the beginning of the Iron Age, 2000–1000 BC in the Near East, and 600 BC in Northern Europe. The transition between
4480-438: The sugar is signaled by a color change from blue Cu(II) to reddish copper(I) oxide. Schweizer's reagent and related complexes with ethylenediamine and other amines dissolve cellulose . Amino acids such as cystine form very stable chelate complexes with copper(II) including in the form of metal-organic biohybrids (MOBs). Many wet-chemical tests for copper ions exist, one involving potassium ferricyanide , which gives
4550-399: The top kilometer of Earth's crust, which is about 5 million years' worth at the current rate of extraction. However, only a tiny fraction of these reserves is economically viable with present-day prices and technologies. Estimates of copper reserves available for mining vary from 25 to 60 years, depending on core assumptions such as the growth rate. Recycling is a major source of copper in
4620-419: Was born in Luanshya on 3 April 1949. 13°08′S 28°24′E / 13.133°S 28.400°E / -13.133; 28.400 Copper Copper is a chemical element ; it has symbol Cu (from Latin cuprum ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity . A freshly exposed surface of pure copper has
4690-527: Was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal , with the largest single crystal ever described measuring 4.4 × 3.2 × 3.2 cm . Copper is the 26th most abundant element in Earth's crust , representing 50 ppm compared with 75 ppm for zinc , and 14 ppm for lead . Typical background concentrations of copper do not exceed 1 ng/m in
4760-577: Was later renamed Bwananyina. In Roan Township there were Roan, Chaisa, Makoma, Kafubu primary schools, while Mpatamatu had Mpatamatu, Nkulumashiba, Nkambo, primary schools. Luanshya township had Rivercross, Harrison now Mpelembe, Convent now known as Buteko. SECONDARY SCHOOLS: Mikomfwa township had no secondary school, Luanshya township had Luanshya High School for boys and Luanshya Girls High school, Roan township had only Roan Antelope and Mpatamatu township had Mpatamatu secondary. During Zambia's painful privatisation period, thousands of miners were laid off by
4830-553: Was solved when the Luanshya River was channeled and its swamps drained during the 1929-32 anti-malaria campaign. The death rate from the epidemic that occurred during the early days of mine development earned the town the nickname of Valley of Death which some people latched on to as the real meaning. However, Luanshya means river of antelopes due to the many antelopes that were found in the area before mining settlements drove them away. Places thus named are Luanshya River, Luanshya Stream, Luanshya Town and Luanshya Township. The name for
4900-479: Was vandalised by scrap metal dealers. At present Luanshya and Ndola are no-longer connected by a rail line. The copper mined from Luanshya is now transported by road to the outside market. Many of the urban roads in Luanshya are named after trees and as such the initial letter of the Tree alphabetically are given the commonly used name of that road. Ie Datura Ave became D avenue. Eucalyptus Ave became E ave etc....Many of
#986013