Copper extraction refers to the methods used to obtain copper from its ores . The conversion of copper ores consists of a series of physical, chemical, and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations , and other factors.
122-570: The Panguna mine is a large copper mine located in Bougainville , Papua New Guinea . Panguna represents one of the largest copper reserves in Papua New Guinea and in the world, having an estimated reserve of one billion tonnes of ore copper and twelve million ounces of gold . The mine has been closed since 1989 and has ceased all production. The discovery of vast copper ore deposits in Bougainville 's Crown Prince Range led to
244-635: A form of slavery , in which boys from Balkan Christian families were forcibly converted to Islam and trained for infantry units of the Ottoman army known as the Janissaries . The Serbian Patriarchate of Peć was extinguished in 1463, but reestablished in 1557, providing for limited continuation of Serbian cultural traditions within the Ottoman Empire, under the Millet system . After
366-413: A heap leaching or dump leaching . The resulting pregnant leach solution is purified by solvent extraction (SX). It is treated with an organic solvent and an organic chelators. The chelators bind the copper ions (and no other ions, ideally), the resulting complexes dissolve in the organic phase. This organic solvent is evaporated, leaving a residue of the copper complexes. The copper ions are liberated from
488-484: A warm-humid continental or humid subtropical climate . In the north, the climate is more continental, with cold winters, and hot, humid summers along with well-distributed rainfall patterns. In the south, summers and autumns are drier, and winters are relatively cold, with heavy inland snowfall in the mountains. Differences in elevation, proximity to the Adriatic Sea and large river basins, as well as exposure to
610-649: A civil war between royalist Chetniks commanded by Draža Mihailović and communist partisans commanded by Josip Broz Tito . Axis auxiliary units of the Serbian Volunteer Corps and the Serbian State Guard fought against both of these forces. The siege of Kraljevo was a major battle of the uprising in Serbia , led by Chetnik forces against the Nazis. Several days after the battle began
732-442: A concentrates with 27–29% and 37–40% copper contents from chalcopyrite and chalcocite , respectively. Oxidised copper ores include carbonates such as azurite and malachite , the silicate chrysocolla , and sulfates such as atacamite . In some cases, sulfide ores are allowed to degrade to oxides. Such ores are amenable to hydrometallurgy. Specifically, such oxide ores are usually extracted into aqueous sulfuric acid , usually in
854-515: A conservative prime minister, headed or dominated most governments until his death. King Alexander established a dictatorship in 1929 with the aim of establishing the Yugoslav ideology and single Yugoslav nation , changed the name of the country to Yugoslavia. The effect of Alexander's dictatorship was to further alienate the non-Serbs living in Yugoslavia from the idea of unity. Alexander
976-587: A distinctive " Muslim " nationality. As a result of these reforms, there was a massive overhaul of Kosovo's nomenklatura and police, that shifted from being Serb-dominated to ethnic Albanian-dominated through firing Serbs on a large scale. Further concessions were made to the ethnic Albanians of Kosovo in response to unrest, including the creation of the University of Pristina as an Albanian language institution. These changes created widespread fear among Serbs of being treated as second-class citizens . Belgrade,
1098-519: A few years before selling their copper assets. Reportedly gains were not as high as anticipated. Investments in copper mining concentrated in Chile in the 1980s and 1990s given that copper mining in other countries faced problems like political instability ( Peru ), increased environmental requirements (developed countries) or overall disinterest in foreign investment in a nationalized mining industry ( Zaire , Zambia ). The average grade of copper ores in
1220-406: A high grade copper concentrate. The roasting process is generally undertaken in combination with reverberatory furnaces . In the roaster, the copper concentrate is partially oxidised to produce " calcine ". Sulfur dioxide is liberated. The stoichiometry of the reaction is: Roasting generally leaves more sulfur in the calcined product (15% in the case of the roaster at Mount Isa Mines ) than
1342-488: A higher profit. This extraction process can be applied to large quantities of low-grade ores, at a lower capital cost with minimal environmental impact. Generally, direct froth flotation is not used to concentrate copper oxide ores, as a result of the largely ionic and hydrophilic structure of the copper oxide mineral surface. Copper oxide ores are typically treated via chelating-reagent flotation and fatty-acid flotation, which use organic reagents to ensure adsorption onto
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#17327719942491464-678: A majority (57%) of its overall male population. Serbia suffered the biggest casualty rate in World War I . The Corfu Declaration was a formal agreement between the government-in-exile of the Kingdom of Serbia and the Yugoslav Committee (anti-Habsburg South Slav émigrés) that pledged to unify Kingdom of Serbia and Kingdom of Montenegro with Austria-Hungary's South Slav autonomous crown lands: Kingdom of Croatia-Slavonia , Kingdom of Dalmatia , Slovenia , Vojvodina (then part of
1586-419: A number of Serbian Orthodox churches and monasteries destroyed or damaged. On 21 May 2006, Montenegro held a referendum which showed 55.4% of voters in favour of independence, just above the 55% required by the referendum. This was followed on 5 June 2006 by Serbia's declaration of independence, marking the re-emergence of Serbia as an independent state. The National Assembly of Serbia declared Serbia to be
1708-506: A number of international analysts, Serbia has suffered from democratic backsliding into authoritarianism , followed by a decline in media freedom and civil liberties. After the COVID-19 pandemic spread to Serbia in March 2020, a state of emergency was declared and a curfew was introduced for the first time in Serbia since World War II. In April 2022, President Aleksandar Vučić
1830-489: A parallel reaction the iron sulfide is converted to slag: The purity of this product is 98%, it is known as blister because of the broken surface created by the escape of sulfur dioxide gas as blister copper pigs or ingots are cooled. By-products generated in the process are sulfur dioxide and slag . The sulfur dioxide is captured and converted to sulfuric acid and either sold on the open market or used in copper leaching processes. Serbia Serbia , officially
1952-575: A reduction of powers for the autonomous provinces of Kosovo and Vojvodina, where his allies subsequently took over power, during the Anti-bureaucratic revolution . This ignited tensions between the communist leadership of the other republics of Yugoslavia and awoke ethnic nationalism across Yugoslavia that eventually resulted in its breakup , with Slovenia , Croatia , Bosnia and Herzegovina , and Macedonia declaring independence during 1991 and 1992. Serbia and Montenegro remained together as
2074-424: A significant portion of the sulfur has been eliminated during the roasting stage, and the calcine consists of a mixture of copper and iron oxides and sulfides. The reverberatory furnace acts to allow these species to approach chemical equilibrium at the furnace operating temperature (approximately 1600 °C at the burner end of the furnace and about 1200 °C at the flue end; the matte is about 1100 °C and
2196-527: A sinter plant leaves in the sintered product (about 7% in the case of the Electrolytic Refining and Smelting smelter ). As of 2005, roasting is no longer common in copper concentrate treatment because its combination with reverberatory furnaces is not energy efficient and the SO 2 concentration in the roaster offgas is too dilute for cost-effective capture. Direct smelting is now favored, and uses
2318-474: Is a minor part of a supergene profile it will not be recovered and will report to the tailings . When rich enough, native copper ore bodies may be treated to recover the contained copper by gravity separation . Often, the nature of the gangue is important, as clay-rich native copper ores prove difficult to liberate. This is because clay minerals interact with flotation reagents used in extraction processes, that are then consumed, which results in minimal recovery of
2440-422: Is a mixture of copper, iron and sulfur that is enriched in copper, which is called matte or copper matte . The term matte grade is normally used to refer to the copper content of the matte. The purpose of the matte smelting stage is to eliminate as much of the unwanted iron, sulfur and gangue minerals (such as silica, magnesia, alumina and limestone) as possible, while minimizing the loss of copper. This
2562-421: Is achieved by reacting iron sulfides with oxygen (in air or oxygen enriched air) to produce iron oxides (mainly as FeO , but with some magnetite (Fe 3 O 4 )) and sulfur dioxide . Copper sulfide and iron oxide can mix, but when sufficient silica is added, a separate slag layer is formed. Adding silica also reduces the melting point (or, more properly, the liquidus temperature) of the slag, meaning that
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#17327719942492684-595: Is an upper-middle income economy and provides universal health care and free primary and secondary education to its citizens. It is a unitary parliamentary constitutional republic , member of the UN , CoE , OSCE , PfP , BSEC , CEFTA , and is acceding to the WTO . Since 2014, the country has been negotiating its EU accession , with the possibility of joining the European Union by 2030. Serbia formally adheres to
2806-614: Is an energy-efficient smelting process that was jointly developed from the 1970s to the 1990s by Mount Isa Mines (a subsidiary of MIM Holdings and now part of Glencore ) and the Government of Australia 's CSIRO . It has relatively low capital and operating costs for a smelting process. ISASMELT technology has been applied to lead, copper, and nickel smelting. As of 2021, 22 plants were in operation in eleven countries, along with three demonstration plants located at Mt Isa. The installed capacity of copper/nickel operating plants in 2020
2928-638: Is claimed between 60,000 and 70,000 people died in Serbia during the 1944–45 communist purge . Serbia became a constituent republic within the Federal People's Republic of Yugoslavia known as the People's Republic of Serbia , and had a republic-branch of the federal communist party, the League of Communists of Serbia . Serbia's most powerful and influential politician in Tito-era Yugoslavia
3050-465: Is constantly forced through the slurry. The air bubbles attach to the hydrophobic copper sulfide particles, which are conveyed to the surface where the froth is skimmed off. These skimmings are generally subjected to a cleaner-scavenger cell to remove excess silicates and to remove other sulfide minerals that can deleteriously impact the concentrate quality (typically, galena ), and the final concentrate sent for smelting. The rock that has not floated off in
3172-411: Is eliminated from the concentrate). It is essentially a melting process. Consequently, wet-charged reverberatory furnaces have less copper in their matte product than calcine-charged furnaces, and they also have lower copper losses to slag. Gill quotes a copper in slag value of 0.23% for a wet-charged reverberatory furnace vs 0.37% for a calcine-charged furnace. In the case of calcine-charged furnaces,
3294-964: Is located in the Balkan peninsula and the Pannonian Plain . Serbia lies between latitudes 41° and 47° N , and longitudes 18° and 23° E . The country covers a total of 88,499 km (34,170 sq mi); with Kosovo excluded, the total area is 77,474 km (29,913 sq mi). Its total border length amounts to 2,027 km (1,260 mi): Albania 115 km (71 mi), Bosnia and Herzegovina 302 km (188 mi), Bulgaria 318 km (198 mi), Croatia 241 km (150 mi), Hungary 151 km (94 mi), North Macedonia 221 km (137 mi), Montenegro 203 km (126 mi) and Romania 476 km (296 mi). All of Kosovo's border with Albania (115 km (71 mi)), North Macedonia (159 km (99 mi)) and Montenegro (79 km (49 mi)) are under control of
3416-427: Is normally added to help form the slag. The furnace is fired with burners using pulverized coal, fuel oil or natural gas. Reverberatory furnaces can additionally be fed with molten slag from the later converting stage to recover the contained copper and other materials with a high copper content. Because the reverberatory furnace bath is quiescent, very little oxidation of the feed occurs (and thus very little sulfur
3538-750: Is not disputable (notably in the Balkans and Lusatia ). However, there are also sources that have used similar names in other parts of the world (most notably in the Asiatic Sarmatia in the Caucasus ). There exist two prevailing theories about the origin of the ethnonym *Sŕbъ (plur. *Sŕby ), one from a Proto-Slavic language with an appellative meaning of a "family kinship" and "alliance", while another from an Iranian-Sarmatian language with various meanings. In his work, De Administrando Imperio , Constantine VII Porphyrogenitus suggests that
3660-680: The Danube . During the Iron Age , local tribes of Triballi , Dardani , and Autariatae were encountered by the Ancient Greeks during their cultural and political expansion into the region, from the 5th up to the 2nd century BC. The Celtic tribe of Scordisci settled throughout the area in the 3rd century BC. It formed a tribal state, building several fortifications, including their capital at Singidunum (present-day Belgrade) and Naissos (present-day Niš ). The Romans conquered much of
3782-664: The Democratic Opposition of Serbia (DOS), a broad coalition of anti-Milošević parties. This culminated on 5 October when half a million people from all over the country congregated in Belgrade, compelling Milošević to concede defeat. The fall of Milošević ended Yugoslavia's international isolation . Milošević was sent to the International Criminal Tribunal for the former Yugoslavia . The DOS announced that FR Yugoslavia would seek to join
Panguna mine - Misplaced Pages Continue
3904-684: The European Union . In 2003, the Federal Republic of Yugoslavia was renamed Serbia and Montenegro ; the EU opened negotiations with the country for the Stabilisation and Association Agreement . Serbia's political climate remained tense and in 2003, Prime Minister Zoran Đinđić was assassinated as result of a plot originating from organised crime and former security officials. In 2004 unrest in Kosovo took place, leaving 19 people dead and
4026-680: The Federal Republic of Yugoslavia (FRY). However, according to the Badinter Commission , the country was not legally considered a continuation of the former SFRY, but a new state. Fueled by ethnic tensions, the Yugoslav Wars (1991–2001) erupted, with the most severe conflicts taking place in Croatia and Bosnia , where the large ethnic Serb communities opposed independence from Yugoslavia. The FRY remained outside
4148-628: The First Serbian Uprising (1804–1813), led by vožd Karađorđe Petrović , Serbia was independent for almost a decade before the Ottoman army was able to reoccupy the country. The Second Serbian Uprising began in 1815, led by Miloš Obrenović ; it ended with a compromise between Serbian revolutionaries and Ottoman authorities. Serbia was one of the first nations in the Balkans to abolish feudalism . The Akkerman Convention in 1826,
4270-673: The Great Powers , by 1867 the last Turkish soldiers left the Principality, making the country de facto independent. By enacting a new constitution in 1869, without consulting the Porte, Serbian diplomats confirmed the de facto independence of the country. In 1876, Serbia declared war on the Ottoman Empire, siding with the ongoing Christian uprisings in Bosnia-Herzegovina and Bulgaria . The formal independence of
4392-699: The Holy See and Constantinople in 1217, reaching its territorial apex in 1346 as the Serbian Empire . By the mid-16th century, the Ottomans annexed the entirety of modern-day Serbia; their rule was at times interrupted by the Habsburg Empire , which began expanding towards Central Serbia from the end of the 17th century while maintaining a foothold in Vojvodina . In the early 19th century,
4514-602: The Human Rights Law Centre lodged a complaint with the Australian government regarding adverse environmental and human rights impacts of the mine. The environmental impacts of the mine continue to this day. Many people have had to relocate to higher ground to avoid contaminated drinking water. Heavy metals such as copper, zinc, and mercury are found in the surrounding rivers. Rio Tinto has refused to fund remediation works, stating that it fully complied with
4636-641: The Independent State of Croatia and sought refuge in German-occupied Serbia, seeking to escape the large-scale persecution and Genocide of Serbs , Jews, and Roma being committed by the Ustaše regime. The number of Serb victims was approximately 300,000 to 350,000. According to Tito himself, Serbs made up the vast majority of anti-fascist fighters and Yugoslav Partisans for the whole course of World War II . The Republic of Užice
4758-714: The Kingdom of Serbia as crownland . Those gains were lost by the Treaty of Belgrade in 1739, when the Ottomans retook the region. Apart from territory of modern-day Vojvodina which remained under the Habsburg Empire, central regions of Serbia were occupied once again by the Habsburgs in 1788–1792 . The Serbian Revolution for independence from the Ottoman Empire lasted eleven years, from 1804 until 1815. During
4880-695: The Podgorica Assembly deposed the House of Petrović-Njegoš and united Montenegro with Serbia. On 1 December 1918, in Belgrade, Serbian Prince Regent Alexander Karađorđević proclaimed the Kingdom of the Serbs, Croats, and Slovenes , under King Peter I of Serbia . King Peter was succeeded by his son, Alexander, in August 1921. Serb centralists and Croat autonomists clashed in the parliament, and most governments were fragile and short-lived. Nikola Pašić ,
5002-473: The Republic of Serbia , is a landlocked country at the crossroads of Southeast and Central Europe , located in the Balkans and the Pannonian Plain . It borders Hungary to the north, Romania to the northeast, Bulgaria to the southeast, North Macedonia to the south, Croatia and Bosnia and Herzegovina to the west, and Montenegro to the southwest. Serbia claims a border with Albania through
Panguna mine - Misplaced Pages Continue
5124-494: The Serbian Revolution established the nation-state as the region's first constitutional monarchy , which subsequently expanded its territory. In 1918, in the aftermath of World War I , the Kingdom of Serbia united with the former Habsburg crownland of Vojvodina ; later in the same year it joined with other South Slavic nations in the foundation of Yugoslavia , which existed in various political formations until
5246-629: The Syrmian Front was the last major military action of World War II in Serbia. A study by Vladimir Žerjavić estimates total war-related deaths in Yugoslavia at 1,027,000, including 273,000 in Serbia. The victory of the Communist Partisans resulted in the abolition of the monarchy and a subsequent constitutional referendum. A one-party state was soon established in Yugoslavia by the Communist Party of Yugoslavia . It
5368-550: The Treaty of Adrianople in 1829 and finally, the Hatt-i Sharif , recognised the suzerainty of Serbia. The First Serbian Constitution was adopted on 15 February 1835, making the country one of the first to adopt a democratic constitution in Europe. 15 February is now commemorated as Statehood Day , a public holiday . Following the clashes between the Ottoman army and Serbs in Belgrade in 1862, and under pressure from
5490-523: The Yugoslav Wars of the 1990s. During the breakup of Yugoslavia , Serbia formed a union with Montenegro , which was peacefully dissolved in 2006, restoring Serbia's independence as a sovereign state for the first time since 1918. In 2008, representatives of the Assembly of Kosovo unilaterally declared independence , with mixed responses from the international community while Serbia continues to claim it as part of its own sovereign territory . Serbia
5612-614: The disputed territory of Kosovo . Serbia has about 6.6 million inhabitants, excluding Kosovo. Its capital Belgrade is also the largest city . Continuously inhabited since the Paleolithic Age, the territory of modern-day Serbia faced Slavic migrations in the 6th century. Several regional states were founded in the early Middle Ages and were at times recognised as tributaries to the Byzantine , Frankish and Hungarian kingdoms. The Serbian Kingdom obtained recognition by
5734-469: The refractory bricks lining the furnace. When the removal of the matte or slag is complete, the hole is normally plugged with clay, which is removed when the furnace is ready to be tapped again. Reverberatory furnaces were often used to treat molten converter slag to recover contained copper. This would be poured into the furnaces from ladles carried by cranes. However, the converter slag is high in magnetite and some of this magnetite would precipitate from
5856-450: The 1960s. In the 1960s and 1970s large copper mining operations by U.S. companies were nationalized in many of the main copper producing countries. Thus by the 1980s state owned enterpises overtook the dominant role U.S. companies like Anaconda Copper and Kennecott had had until then. In the late 1970s and early 1980s various oil companies like ARCO , Exxon ( Exxon Minerals ) and Standard Oil Company expanded into copper mining for
5978-517: The 21st century is below 0.6% copper, with a proportion of economic ore minerals being less than 2% of the total volume of the ore rock. Thus, all mining operations, the ore must usually be beneficiated (concentrated). The concentrate is typically sold to distant smelters , although some large mines have smelters located nearby. Such colocation of mines and smelters was more typical in the 19th and early 20th centuries, when smaller smelters could be economic. The subsequent processing techniques depend on
6100-556: The BRA, who sought secession from PNG, and the Papua New Guinea Defence Force . The ten-year conflict resulted in over 20,000 deaths, the eventual closure of the mine on 15 May 1989, and the complete withdrawal of BCL personnel by 24 March 1990. As of November 2024, it remains closed. In June 2016, Rio Tinto relinquished its role by divesting its interests in the mine to national and local governments. In 2020,
6222-574: The Byzantine territory in large numbers. They merged with the local Romanised population that was gradually assimilated. White Serbs, an early Slavic tribe from White Serbia eventually settled in an area between the Sava river and the Dinaric Alps . By the beginning of the 9th century, Serbia achieved a level of statehood. Christianization of Serbia was a gradual process, finalized by
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#17327719942496344-728: The EU. Serbia officially applied for membership in the European Union on 22 December 2009, and received candidate status on 1 March 2012, following a delay in December 2011. Following a positive recommendation of the European Commission and European Council in June 2013, negotiations to join the EU commenced in January 2014. In 2012 Aleksandar Vučić and his Serbian Progressive Party came to power. According to
6466-704: The Emperor Leopold I formally granted Serbs from the Habsburg monarchy a first set of "privileges", primarily to guarantee them freedom of religion. As a consequence, the ecclesiastical centre of the Serbs also moved northwards, to the Metropolitanate of Karlovci , and the Serbian Patriarchate of Peć was once-again abolished by the Ottomans in 1766. In 1718–39, the Habsburg monarchy occupied much of Central Serbia and established
6588-531: The German forces committed a massacre of approximately 2,000 civilians in an event known as the Kraljevo massacre , in a reprisal for the attack. Draginac and Loznica massacre of 2,950 villagers in Western Serbia in 1941 was the first large execution of civilians in occupied Serbia by Germans , with Kragujevac massacre and Novi Sad Raid of Jews and Serbs by Hungarian fascists being the most notorious, with over 3,000 victims in each case. After one year of occupation, around 16,000 Serbian Jews were murdered in
6710-455: The Kingdom of Hungary) and Bosnia and Herzegovina in a post-war Yugoslav state. It was signed on 20 July 1917 on Corfu. As the Austro-Hungarian Empire collapsed, the territory of Syrmia united with Serbia on 24 November 1918. Just a day later, the Great People's Assembly of Serbs, Bunjevci and other Slavs in Banat, Bačka and Baranja declared the unification of these regions ( Banat , Bačka , and Baranja ) with Serbia. On 26 November 1918,
6832-471: The Kosovo border police. Serbia treats the 352 km (219 mi) border with Kosovo as an "administrative line"; it is under shared control of Kosovo border police and Serbian police forces. The Pannonian Plain covers the northern third of the country (Vojvodina and Mačva ) while the easternmost tip of Serbia extends into the Wallachian Plain . The terrain of the central part of the country consists chiefly of hills traversed by rivers. Mountains dominate
6954-434: The Ottoman army reconquered a large part of Serbia in the winter of 1689/1690, leading to a brutal massacre of the civilian population by uncontrolled Albanian and Tatar units. As a result of the persecutions, several tens of thousands of Serbs, led by the patriarch, Arsenije III Crnojević , fled northwards to settle in Hungary , an event known as the Great Migration of 1690 . In August 1690, following several petitions,
7076-414: The Ottomans, the native nobility was eliminated and the peasantry was enserfed to Ottoman rulers, while much of the clergy fled or were confined to the isolated monasteries. Under the Ottoman system, Serbs and Christians were considered an inferior class and subjected to heavy taxes, and a portion of the Serbian population experienced Islamization . Many Serbs were recruited during the devshirme system,
7198-403: The Serbs originated from White Serbia near Francia . From 1815 to 1882, the official name for Serbia was the Principality of Serbia . From 1882 to 1918, it was renamed to the Kingdom of Serbia , later from 1945 to 1963, the official name for Serbia was the People's Republic of Serbia. This was again renamed the Socialist Republic of Serbia from 1963 to 1990. Since 1990, the official name of
7320-441: The area of modern-day Serbia, second only to contemporary Italy. The most famous of these was Constantine the Great , the first Christian Emperor, who issued an edict ordering religious tolerance throughout the Empire . When the Roman Empire was divided in 395, most of Serbia remained under the Byzantine Empire , and its northwestern parts were included in the Western Roman Empire . By the 6th century, South Slavs migrated into
7442-427: The area, or around 90% of its pre-war Jewish population during The Holocaust in Serbia . Many concentration camps were established across the area. Banjica concentration camp was the largest concentration camp and jointly run by the German army and Nedić's regime, with primary victims being Serbian Jews, Roma , and Serb political prisoners. Hundreds of thousands of ethnic Serbs fled the Axis puppet state known as
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#17327719942497564-526: The capital of FPR Yugoslavia and PR Serbia, hosted the first Non-Aligned Movement Summit in September 1961, as well as the first major gathering of the Organization for Security and Co-operation in Europe (OSCE) with the aim of implementing the Helsinki Accords from October 1977 to March 1978. The 1972 smallpox outbreak in SAP Kosovo and other parts of SR Serbia was the last major outbreak of smallpox in Europe since World War II. In 1989, Slobodan Milošević rose to power in Serbia. Milošević promised
7686-426: The capital of the newly established Serbian Despotate was transferred to Belgrade in 1403, before moving to Smederevo in 1430. The Despotate was then under the double vassalage of Hungary and the Ottoman Empire. The fall of Smederevo on 20 June 1459, which marked the full conquest of the Serbian Despotate by the Ottomans, also symbolically signified the end of the Serbian state. In all Serbian lands conquered by
7808-412: The concentrate is dispersed in an air or oxygen stream and the smelting reactions are largely completed while the mineral particles are still in flight. The reacted particles then settle in a bath at the bottom of the furnace, where they behave like calcine in a reverberatory furnace. A slag layer forms on top of the matte layer, and they can separately be tapped from the furnace. The ISASMELT process
7930-452: The concentration of copper in the ore bodies decreased, the energy costs of smelting the whole ore also became prohibitive, and it became necessary to concentrate the ores first. Initial concentration techniques included hand-sorting and gravity concentration. These resulted in high losses of copper. Consequently, the development of the froth flotation process was a major step forward in mineral processing. The modern froth flotation process
8052-428: The conflicts, but provided logistic, military and financial support to Serb forces in the wars. In response, the UN imposed sanctions against Yugoslavia which led to political isolation and the collapse of the economy (GDP decreased from $ 24 billion in 1990 to under $ 10 billion in 1993). Serbia was in the 2000s sued on the charges of alleged genocide by neighbouring Bosnia and Herzegovina and Croatia but in both cases
8174-406: The converter slag (due to its higher melting point), forming an accretion on the hearth of the reverberatory furnace and necessitating shut downs of the furnace to remove the accretion. This accretion formation limits the quantity of converter slag that can be treated in a reverberatory furnace. While reverberatory furnaces have very low copper losses to slag, they are not very energy-efficient and
8296-421: The copper dissolved in slags from mattes containing less than 50% copper is sulfidic copper. Above this figure, oxidic copper begins to dominate. The loss of copper as prills suspended in the slag depends on the size of the prills, the viscosity of the slag and the settling time available. Rosenqvist suggested that about half the copper losses to slag were due to suspended prills. The mass of slag generated in
8418-467: The copper from the pregnant leach solution . To ensure the best recovery of copper, it is important to acknowledge the effect copper dissolution, acid consumption, and gangue mineral composition has on the efficacy of extraction. Supergene sulfide ores rich in native copper are refractory to treatment with sulfuric acid leaching on all practicable time scales, and the dense metal particles do not react with froth flotation media. Typically, if native copper
8540-611: The country has been the Republic of Serbia. Archaeological evidence of Paleolithic settlements on the territory of present-day Serbia is scarce. A fragment of a hominid jaw found in Sićevo (Mala Balanica ) is believed to be up to 525,000–397,000 years old. Approximately 6,500 BC, during the Neolithic , the Starčevo and Vinča cultures existed in the region of modern-day Belgrade. They dominated much of Southeast Europe as well as parts of Central Europe and Anatolia . Several important archaeological sites from this era, including Lepenski Vir and Vinča-Belo Brdo , still exist near
8662-403: The country was internationally recognised at the Congress of Berlin in 1878, which ended the Russo-Turkish War ; this treaty, however, prohibited Serbia from uniting with other Serbian regions by placing Bosnia and Herzegovina under Austro-Hungarian occupation, alongside the occupation of the region of Raška . From 1815 to 1903, the principality was ruled by the House of Obrenović , save for
8784-404: The crushed ore is wetted, suspended in a slurry, and mixed with reagents that render the sulfide particles hydrophobic . Typical reagents ("collectors") include potassium ethylxanthate and sodium ethylxanthate , but dithiophosphates and dithiocarbamates are also used. The slurry is introduced to a water-filled aeration tank containing a surfactant such as methylisobutyl carbinol (MIBC). Air
8906-409: The depletion of copper resources. Processes including in situ, dump, and heap leaching are cost-effective methods that are suitable for extracting copper from low-grade ores. Extraction processes for secondary copper sulfides and low-grade ores includes the process of heap bioleaching. Heap bioleaching presents a cost efficient extraction method that requires a less intensive energy input resulting in
9028-606: The earlier record of copper smelting from Rudna Glava ( Serbia ). Copper smelting technology gave rise to the Copper Age , aka Chalcolithic Age, and then the Bronze Age . The Bronze Age would not have been possible without the development of smelting technology. Until the latter half of the 20th century, smelting sulfide ores was almost the sole means of producing copper metal from mined ores ( primary copper production). As of 2002, 80% of global primary copper production
9150-632: The establishment of the copper mine in 1969 by Bougainville Copper Ltd (BCL), a subsidiary of the Australian company Conzinc Rio Tinto of Australia . The mine began production in 1972, with the support of the Papua New Guinea National Government as a 20% shareholder. In contrast to this, the Bougainvilleans received 0.5–1.25% share of the total profit. The site was at the time the world's largest open-pit copper/gold mine, generating 12% of PNG's GDP and over 45% of
9272-489: The extinction of the flying fox on the island. Bougainville Copper had set up a system of racial segregation on the island, with one set of facilities for white workers and one set for locals. This prompted an uprising in 1988, led by Francis Ona , a Panguna landowner and commander of the Bougainville Revolutionary Army (BRA). The outcome of the uprising was the Bougainville conflict , between
9394-402: The flotation cell is either discarded as tailings or further processed to extract other metals such as lead (from galena) and zinc (from sphalerite ), should they exist. A variety of measures are taken to improve the efficiency of the froth flotation. Lime is used to raise the pH of the water bath, causing the collector to bond more efficiently to the copper sulfides. The process can produce
9516-449: The following smelting technologies: flash smelting , Isasmelt , Noranda, Mitsubishi or El Teniente furnaces. The initial melting of the material to be smelted is usually referred to as the smelting or matte smelting stage. It can be undertaken in a variety of furnaces, including the largely obsolete blast furnaces and reverberatory furnaces , as well as flash furnaces , Isasmelt furnaces, etc. The product of this smelting stage
9638-427: The furnace as separate streams. The slag layer is periodically allowed to flow through a hole in the wall of the furnace above the height of the matte layer. The matte is removed by draining it through a hole into ladles for it to be carried by crane to the converters. This draining process is known as tapping the furnace. The matte taphole is normally a hole through a water-cooled copper block that prevents erosion of
9760-770: The government. In 1998, continued clashes between the Albanian guerilla Kosovo Liberation Army and Yugoslav security forces led to the short Kosovo War (1998–99), in which NATO intervened, leading to the withdrawal of Serbian forces and the establishment of UN administration in the province. After the Yugoslav Wars, Serbia became home to highest number of refugees and internally displaced persons in Europe. After presidential elections in September 2000, opposition parties accused Milošević of electoral fraud . A campaign of civil resistance followed, led by
9882-449: The judicial system. The country was chosen to host international specialised exposition Expo 2027 . The Serbian government is working with Rio Tinto corporation on a project which aims to develop Europe's biggest lithium mine. Mining lithium became a matter of debate in the society and several protests against mining took place. A landlocked country situated at the crossroads between Central and Southeastern Europe, Serbia
10004-473: The legal successor to the former state union. The Assembly of Kosovo unilaterally declared independence from Serbia on 17 February 2008. Serbia immediately condemned the declaration and continues to deny any statehood to Kosovo. The declaration has sparked varied responses from the international community. Status-neutral talks between Serbia and Kosovo-Albanian authorities are held in Brussels , mediated by
10126-459: The loss of copper to slag in the smelting stage are: This means that there is a practical limit on how high the matte grade can be if the loss of copper to slag is to be minimized. Therefore, further stages of processing (converting and fire refining) are required. The following subsections briefly describe some of the processes used in matte smelting. Reverberatory furnaces are long furnaces that can treat wet, dry, or roasted concentrate. Most of
10248-486: The loss of statehood to the Ottoman Empire, Serbian resistance continued in northern regions (modern Vojvodina), under titular despots (until 1537), and popular leaders like Jovan Nenad (1526–1527). From 1521 to 1552, Ottomans conquered Belgrade and regions of Syrmia, Bačka, and Banat. Wars and rebellions constantly challenged Ottoman rule. One of the most significant was the Banat Uprising in 1594 and 1595, which
10370-463: The low concentrations of sulfur dioxide in their off-gases make its capture uneconomic. Consequently, smelter operators devoted a lot of money in the 1970s and 1980s to developing new, more efficient copper smelting processes. In addition, flash smelting technologies had been developed in earlier years and began to replace reverberatory furnaces. By 2002, 20 of the 30 reverberatory furnaces still operating in 1994 had been shut down. In flash smelting ,
10492-639: The lowest point of just 17 metres (56 feet) near the Danube river at Prahovo . The largest lake is Đerdap Lake (163 square kilometres (63 sq mi)) and the longest river passing through Serbia is the Danube (587.35 kilometres (364.96 mi)). The climate of Serbia is under the influences of the landmass of Eurasia and the Atlantic Ocean and Mediterranean Sea . With mean January temperatures around 0 °C (32 °F), and mean July temperatures of 22 °C (72 °F), it can be classified as
10614-431: The main charges against Serbia were dismissed. Multi-party democracy was introduced in Serbia in 1990, officially dismantling the one-party system. Despite constitutional changes, Milošević maintained strong political influence over the state media and security apparatus. When the ruling Socialist Party of Serbia refused to accept its defeat in municipal elections in 1996 , Serbians engaged in large protests against
10736-516: The middle of the 9th century. In the mid-10th-century, the Serbian state experienced a fall. During the 11th and 12th century, Serbian state frequently fought with the neighbouring Byzantine Empire. Between 1166 and 1371, Serbia was ruled by the Nemanjić dynasty , under whom the state was elevated to a kingdom in 1217, and an empire in 1346, under Stefan Dušan . The Serbian Orthodox Church
10858-437: The mineral chalcocite; a mineral formed from primary sulfides, like chalcopyrite , that undergo chemical processes such as oxidation or reduction. Typically, secondary sulfide ores are concentrated using froth flotation. Other extraction processes like leaching are effectively used for the extraction of secondary copper sulfides, but as demand for copper rises, extraction processes tailored for low-grade ores are required, due to
10980-426: The mineral surface through the formation of hydrophobic compounds on the mineral surface. Some supergene sulfide deposits can be leached using a bacterial oxidation heap leach process to oxidize the sulfides to sulfuric acid, which also allows for simultaneous leaching with sulfuric acid to produce a copper sulfate solution. For oxide ores, solvent extraction and electrowinning technologies are used to recover
11102-529: The nation's export revenue. Profits derived from the mine helped fund Papua New Guinea's independence from Australia, in 1975. Mining at Panguna included the direct discharge of tailings into tributaries of the Jaba River . The mine caused devastating environmental issues on the island, and the company was responsible for poisoning the entire length of the Jaba River, causing birth defects, as well as
11224-409: The nature of the ore. In the usual case when it is primarily sulfide copper minerals (such as chalcopyrite , FeCuS 2 ), the ore is treated by comminution , where the rock is crushed to produce small particles (<100 μm) consisting of individual mineral phases. These particles are then ready to be separated to remove gangue (silicate rocks residues) using froth flotation. In froth flotation,
11346-523: The oldest known examples of copper extraction in the world. The earliest evidence of the cold-hammering of native copper comes from the excavation at Çayönü Tepesi in eastern Anatolia , which dates between 7200 to 6600 BCE. Among the various items considered to be votive or amulets, there was one that looked like a fishhook and one like an awl. Another find, at Shanidar Cave in Mergasur, Iraq, contained copper beads, and dates back to 8,700 BCE. One of
11468-403: The oxygen potential of the slag increases. The oxygen potential generally increases as the copper content of the matte is increased. Thus, the loss of copper as oxide increases as the copper content of the matte increases. On the other hand, the solubility of sulfidic copper in slag decreases as the copper content of the matte increases beyond about 40%. Nagamori calculated that more than half
11590-751: The policy of military neutrality . The origin of the name Serbia is unclear. Historically, authors have mentioned the Serbs ( Serbian : Srbi / Срби) and the Sorbs of Eastern Germany ( Upper Sorbian : Serbja ; Lower Sorbian : Serby ) in a variety of ways: Cervetiis ( Servetiis ), gentis (S)urbiorum , Suurbi , Sorabi , Soraborum , Sorabos , Surpe , Sorabici , Sorabiet , Sarbin , Swrbjn , Servians , Sorbi , Sirbia, Sribia, Zirbia, Zribia , Suurbelant , Surbia , Serbulia / Sorbulia among others. These authors used these names to refer to Serbs and Sorbs in areas where their historical and current presence
11712-614: The region was transformed into the Voivodeship of Serbia and Banat of Temeschwar . In the First Balkan War in 1912, the Balkan League defeated the Ottoman Empire and captured its European territories , which enabled territorial expansion of the Kingdom of Serbia into regions of Raška, Kosovo , Metohija , and Vardarian Macedonia . The Second Balkan War soon ensued when Bulgaria turned on its former allies, but
11834-520: The relevant laws during mining operations. The autonomous government of Bougainville wants to reopen the mine for the purposes of seeking an independent funding source. Estimates place the cost of reopening the mine at $ 5 to $ 6 billion. [REDACTED] Media related to Panguna mine at Wikimedia Commons Copper mine The Old Copper Complex in North America has been radiometrically dated to 9500 BP—i.e., about 7480 BCE—making it one of
11956-517: The residue with sulfuric acid. The barred (denuded) sulfuric acid recycled back on to the heaps. The organic ligands are recovered and recycled as well. Alternatively, the copper can be precipitated out of the pregnant solution by contacting it with scrap iron; a process called cementation . Cement copper is normally less pure than SX-EW copper. Secondary sulfides—those formed by supergene secondary enrichment—are resistant ( refractory ) to sulfuric leaching. Secondary copper sulfides are dominated by
12078-428: The reverberatory furnaces used in the latter years treated roasted concentrate because putting dry feed materials into the reverberatory furnace is more energy efficient, and because the elimination of some of the sulfur in the roaster results in higher matte grades. The reverberatory furnace feed is added to the furnace through feed holes along the sides of the furnace, and the solid charge is melted. Additional silica
12200-534: The rule of Prince Aleksandar Karađorđević between 1842 and 1858. In 1882, Principality of Serbia became the Kingdom of Serbia, ruled by King Milan I . The House of Karađorđević , descendants of the revolutionary leader Karađorđe Petrović, assumed power in 1903 following the May Overthrow . The 1848 revolution in Austria led to the establishment of the autonomous territory of Serbian Vojvodina ; by 1849,
12322-403: The slag is about 1195 °C ). In this equilibration process, oxygen associated with copper compounds exchanges with sulfur associated with iron compounds, increasing the iron oxide content of the furnace, and the iron oxides interact with silica and other oxide materials to form the slag. The main equilibration reaction is: The slag and the matte form distinct layers that can be removed from
12444-453: The smelting process can be operated at a lower temperature. The slag forming reaction is: Slag is less dense than matte, so it forms a layer that floats on top of the matte. Copper can be lost from the matte in three ways: as cuprous oxide (Cu 2 O) dissolved in the slag, as sulfide copper dissolved in the slag or as tiny droplets (or prills ) of matte suspended in the slag. The amount of copper lost as oxide copper increases as
12566-401: The smelting stage depends on the iron content of the material fed into the smelting furnace and the target matte grade. The greater the iron content of the feed, the more iron that will need to be rejected to the slag for a given matte grade. Similarly, increasing the target matte grade requires the rejection of more iron and an increase in the slag volume. Thus, the two factors that most affect
12688-674: The southern third of Serbia. Dinaric Alps stretch in the west and the southwest, following the flow of the rivers Drina and Ibar . The Carpathian Mountains and Balkan Mountains stretch in a north–south direction in eastern Serbia. Ancient mountains in the southeast corner of the country belong to the Rilo-Rhodope Mountain system. Elevation ranges from the Midžor peak of the Balkan Mountains at 2,169 metres (7,116 feet) (the highest peak in Serbia, excluding Kosovo) to
12810-689: The territory in the 2nd century BC. In 167 BC, the Roman province of Illyricum was established; the remainder was conquered around 75 BC, forming the Roman province of Moesia Superior ; the modern-day Srem region was conquered in 9 BC; and Bačka and Banat in 106 AD after the Dacian Wars . As a result of this, contemporary Serbia extends fully or partially over several former Roman provinces, including Moesia , Pannonia , Praevalitana , Dalmatia , Dacia , and Macedonia . Seventeen Roman Emperors were born in
12932-590: The two countries became tense. The assassination of Archduke Franz Ferdinand of Austria on 28 June 1914 in Sarajevo by Gavrilo Princip , a member of the Young Bosnia organisation, led to Austria-Hungary declaring war on Serbia, on 28 July 1914, setting off World War I. Serbia won the first major battles of the war, including the Battle of Cer , and the Battle of Kolubara . Despite initial success, it
13054-454: The winds account for climate variations. Southern Serbia is subject to Mediterranean influences. The Dinaric Alps and other mountain ranges contribute to the cooling of most of the warm air masses. Winters are quite harsh in the Pešter plateau, because of the mountains which encircle it. One of the climatic features of Serbia is Košava , a cold and very squally southeastern wind which starts in
13176-503: The world's oldest known copper mines, as opposed to usage of surface deposits, is at Timna Valley , Israel, and has been used since the fourth millennium BC, with surface deposit usage occurring in the fifth and sixth millennium. The Pločnik archaeological site in southeastern Europe ( Serbia ) contains the oldest securely dated evidence of copper making at high temperature, from 5,000 BCE. The find in June 2010 extends for an additional 500 years, dated to 5th millennium BCE, representing
13298-449: Was Aleksandar Ranković , one of the "big four" Yugoslav leaders. Ranković was later removed from the office because of the disagreements regarding Kosovo's nomenklatura and the unity of Serbia. Ranković's dismissal was highly unpopular among Serbs. Pro-decentralisation reformers in Yugoslavia succeeded in the late 1960s in attaining substantial decentralisation of powers, creating substantial autonomy in Kosovo and Vojvodina, and recognising
13420-488: Was re-elected . In December 2023, President Vučić won a snap parliamentary election . The election resulted in protests, with opposition supporters claiming that the election result was fraudulent. On 16 January 2022, a Serbian constitutional referendum took place in which citizens chose to amend the Constitution concerning the judiciary. The changes were presented as a step toward reducing political influence in
13542-419: Was 9.76 million tonnes per year of feed materials and 750 thousand tonnes per year across lead operating plants. The matte, which is produced in the smelter, contains 30–70% copper (depending on the process used and the operating philosophy of the smelter), primarily as copper sulfide, as well as iron sulfide. The sulfur is removed at a high temperature as sulfur dioxide by blowing air through molten matte: In
13664-589: Was a major Balkan Entente Power which contributed significantly to the Allied victory in the Balkans in November 1918, especially by helping France force Bulgaria's capitulation . Serbia's casualties accounted for 8% of the total Entente military deaths; 58% (243,600) soldiers of the Serbian army perished in the war. The total number of casualties is placed around 700,000, more than 16% of Serbia's prewar size, and
13786-675: Was a short-lived liberated territory established by the Partisans and the first liberated territory in World War II Europe, organised as a military mini-state that existed in the autumn of 1941 in the west of occupied Serbia . By late 1944, the Belgrade Offensive swung in favour of the partisans in the civil war; the partisans subsequently gained control of Yugoslavia. Following the Belgrade Offensive,
13908-656: Was assassinated in Marseille , during an official visit in 1934 by Vlado Chernozemski , member of the IMRO . Alexander was succeeded by his eleven-year-old son Peter II . In August 1939 the Cvetković–Maček Agreement established an autonomous Banate of Croatia as a solution to Croatian concerns. In 1941, in spite of Yugoslav attempts to remain neutral, the Axis powers invaded Yugoslavia. The territory of modern Serbia
14030-408: Was defeated, resulting in the Treaty of Bucharest . In two years, Serbia enlarged its territory by 80% and its population by 50%, it also suffered high casualties on the eve of World War I, with more than 36,000 dead. Austria-Hungary became wary of the rising regional power on its borders and its potential to become an anchor for unification of Serbs and other South Slavs, and the relationship between
14152-467: Was divided between Hungary, Bulgaria, the Independent State of Croatia, Greater Albania and Montenegro, while the remainder was placed under the military administration of Nazi Germany , with Serbian puppet governments led by Milan Aćimović and Milan Nedić assisted by Dimitrije Ljotić 's fascist organization Yugoslav National Movement (Zbor). The Yugoslav territory was the scene of
14274-674: Was eventually overpowered by the Central Powers in 1915 and Austro-Hungarian occupation of Serbia followed. Most of its army and some people retreated to Greece and Corfu , suffering immense losses on the way. After the Central Powers' military situation on other fronts worsened, the remains of the Serb army returned east and led a final breakthrough through enemy lines on 15 September 1918, liberating Serbia and defeating Bulgaria and Austria-Hungary. Serbia, with its campaign ,
14396-425: Was from copper–iron–sulfur minerals, and the vast majority of these were treated by smelting. Copper was initially recovered from sulfide ores by directly smelting the ore in a furnace. The smelters were initially located near the mines to minimize the cost of transport. This avoided the prohibitive costs of transporting the waste minerals and the sulfur and iron present in the copper-containing minerals. However, as
14518-590: Was independently invented in the early 1900s in Australia by C.V Potter and around the same time by G. D. Delprat . It made the development of the giant Bingham Canyon mine in Utah possible. In the twentieth century, most ores were concentrated before smelting. Smelting was initially undertaken using sinter plants and blast furnaces , or with roasters and reverberatory furnaces . Roasting and reverberatory furnace smelting dominated primary copper production until
14640-528: Was organized as an autocephalous archbishopric in 1219, through the effort of Sava , the country's patron saint, and in 1346 it was raised to the Patriarchate . Monuments of the Nemanjić period survive in many monasteries (several being World Heritage sites ) and fortifications . During these centuries the Serbian state (and influence) expanded significantly. The northern part (modern Vojvodina ),
14762-611: Was part of the Long War (1593–1606) between the Habsburgs and the Ottomans. The area of modern Vojvodina endured a century-long Ottoman occupation before being ceded to the Habsburg monarchy , partially by the Treaty of Karlovci (1699), and fully by the Treaty of Požarevac (1718). During the Habsburg-Ottoman war (1683–1699) , much of Serbia switched from Ottoman rule to Habsburg control from 1688 to 1690. However,
14884-588: Was ruled by the Kingdom of Hungary . The period after 1371, known as the Fall of the Serbian Empire saw the once-powerful state fragmented into several principalities, culminating in the Battle of Kosovo (1389) against the rising Ottoman Empire . By the end of the 14th century, the Turks had conquered and ruled the territories south of the Šar Mountains . The political center of Serbia shifted northwards, when
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