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110-644: Chile–Mexico Free Trade Agreement is a trade agreement between Chile and Mexico . It was signed in Santiago , Chile on April 17, 1998. The agreement came into effect on 1 August 1999. This treaty marked the first of its kind for Mexico and second for Chile, after their agreement with Canada . The goals of the agreement are to stimulate expansion and diversity of trade, eliminate barriers to trade, promote fair competition, increase investment opportunity, protect and enforce intellectual property rights, establish guidelines for further cooperations, and create procedures for

220-449: A free market economy that saw an increase in domestic and foreign private investment, although the copper industry and other important mineral resources were not opened to competition. In a plebiscite on 5 October 1988, Pinochet was denied a second eight-year term as president (56% against 44%). Chileans elected a new president and the majority of members of a bicameral congress on 14 December 1989. Christian Democrat Patricio Aylwin ,

330-413: 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

440-669: A national referendum in April 2020 regarding the creation of a new Constitution, later postponed to October due to the COVID-19 pandemic . On 25 October 2020, Chileans voted 78.28 per cent in favor of a new constitution, while 21.72 per cent rejected the change. Voter turnout was 51 percent. An election for the members of the Constitutional Convention was held in Chile between 15 and 16 May 2021. On 19 December 2021,

550-591: A parliamentary style democracy. However, the Civil War had also been a contest between those who favored the development of local industries and powerful Chilean banking interests, particularly the House of Edwards which had strong ties to foreign investors. Soon after, the country engaged in a vastly expensive naval arms race with Argentina that nearly led to war, as well because of the Puna de Atacama dispute . After

660-576: A plurality of votes in a three-way contest, followed by candidates Radomiro Tomic for the Christian Democrat Party and Jorge Alessandri for the Conservative Party. Allende was not elected with an absolute majority, receiving fewer than 35% of the votes. The Chilean Congress conducted a runoff vote between the leading candidates, Allende and former president Jorge Alessandri, and, keeping with tradition, chose Allende by

770-529: A referendum in 1988 , and was succeeded by a center-left coalition , which ruled until 2010. Chile is a developing country with a high-income economy and is one of the most economically and socially stable nations in South America. Chile also performs well in the region in terms of sustainability of the state and democratic development. Chile is a founding member of the United Nations ,

880-626: A campaign of domestic political and economical destabilization, some of which was backed by the United States. By early 1973, inflation was out of control. On 26 May 1973, Chile's Supreme Court, which was opposed to Allende's government, unanimously denounced Allende's disruption of the legality of the nation . Although illegal under the Chilean constitution, the court supported and strengthened Pinochet's soon-to-be seizure of power. A military coup overthrew Allende on 11 September 1973. As

990-442: 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

1100-467: 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

1210-406: 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

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1320-488: 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

1430-475: A large variety of climates and landscapes. It contains 756,950 square kilometers (292,260 sq mi) of land area. It is situated within the Pacific Ring of Fire . Excluding its Pacific islands and Antarctic claim, Chile lies between latitudes 17° and 56°S , and longitudes 66° and 75°W . Chile is among the longest north–south countries in the world. If one considers only mainland territory, Chile

1540-414: A leftist candidate, the 35-year-old former student protest leader Gabriel Boric , won Chile's presidential election to become the country's youngest ever leader. On 11 March 2022, Boric was sworn in as president to succeed outgoing President Sebastian Piñera. Out of 24 members of Gabriel Boric's female-majority Cabinet, 14 are women. On 4 September 2022, voters rejected the new constitution proposal in

1650-593: A letter dated 12 November 1821, expressing his plan to conquer Guayaquil , the Galapagos Islands , and the Philippines . There were preparations, but the plan did not push through because O'Higgins was exiled. Chile slowly started to expand its influence and to establish its borders. By the Tantauco Treaty, the archipelago of Chiloé was incorporated in 1826. The economy began to boom due to

1760-555: A period of almost 24 hours, an effort that was carried on live television around the world. 2019–20 Chilean protests are a series of country-wide protests in response to a rise in the Santiago Metro 's subway fare, the increased cost of living , privatization and inequality prevalent in the country. On 15 November, most of the political parties represented in the National Congress signed an agreement to call

1870-536: A period of major reform. Under the slogan "Revolution in Liberty", the Frei administration embarked on far-reaching social and economic programs, particularly in education, housing, and agrarian reform , including rural unionization of agricultural workers. By 1967, however, Frei encountered increasing opposition from leftists, who charged that his reforms were inadequate, and from conservatives, who found them excessive. At

1980-710: A prolonged struggle, including infighting from Bernardo O'Higgins , who challenged Carrera's leadership. Intermittent warfare continued until 1817. With Carrera in prison in Argentina, O'Higgins and anti-Carrera cohort José de San Martín , hero of the Argentine War of Independence , led an army that crossed the Andes into Chile and defeated the royalists. On 12 February 1818, Chile was proclaimed an independent republic . The political revolt brought little social change, however, and 19th-century Chilean society preserved

2090-490: A reformist president, Arturo Alessandri , whose program was frustrated by a conservative congress. In the 1920s, Marxist groups with strong popular support arose. A military coup led by General Luis Altamirano in 1924 set off a period of political instability that lasted until 1932. Of the ten governments that held power in that period, the longest lasting was that of General Carlos Ibáñez del Campo , who briefly held power in 1925 and then again between 1927 and 1931 in what

2200-424: 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

2310-527: 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

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2420-740: A vote of 153 to 35. Frei refused to form an alliance with Alessandri to oppose Allende, on the grounds that the Christian Democrats were a workers' party and could not make common cause with the right wing. An economic depression that began in 1972 was exacerbated by capital flight , plummeting private investment, and withdrawal of bank deposits in response to Allende's socialist program. Production fell and unemployment rose. Allende adopted measures including price freezes, wage increases, and tax reforms, to increase consumer spending and redistribute income downward. Joint public-private public works projects helped reduce unemployment. Much of

2530-474: 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

2640-422: 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

2750-421: 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

2860-590: Is also the historical center from which Chile expanded in the late 19th century when it integrated the northern and southern regions. Southern Chile is rich in forests, grazing lands, and features a string of volcanoes and lakes. The southern coast is a labyrinth of fjords, inlets, canals, twisting peninsulas, and islands. The Andes Mountains are located on the eastern border. Copper mining The Old Copper Complex in North America has been radiometrically dated to 9500 BP—i.e., about 7480 BCE—making it one of

2970-614: 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

3080-465: 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

3190-411: 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,

3300-427: 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

3410-430: Is now Chile. The next Europeans to reach Chile were Diego de Almagro and his band of Spanish conquistadors , who came from Peru in 1535 seeking gold. The Spanish encountered various cultures that supported themselves principally through slash-and-burn agriculture and hunting. The conquest of Chile began in earnest in 1540 and was carried out by Pedro de Valdivia , one of Francisco Pizarro 's lieutenants, who founded

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3520-676: Is present-day Chile. Settlement sites from very early human habitation include Monte Verde, Cueva del Milodón and the Pali-Aike Crater 's lava tube . The Incas briefly extended their empire into what is now northern Chile, but the Mapuche (or Araucanians as they were known by the Spaniards) successfully resisted many attempts by the Inca Empire to subjugate them, despite their lack of state organization. They fought against

3630-619: Is suspended under the terms of the Antarctic Treaty , of which Chile is a signatory. It is the world's southernmost country that is geographically on the mainland. Chile controls Easter Island and Sala y Gómez Island, the easternmost islands of Polynesia, which it incorporated to its territory in 1888, and the Juan Fernández Islands , more than 600 km (370 mi) from the mainland. Also controlled but only temporarily inhabited (by some local fishermen) are

3740-405: Is unique within this group in its narrowness from east to west, with the other long north–south countries (including Brazil, Russia, Canada, and the United States, among others) all being wider from east to west by a factor of more than 10. Chile also claims 1,250,000 km (480,000 sq mi) of Antarctica as part of its territory ( Chilean Antarctic Territory ). However, this latter claim

3850-750: The Andes Mountains and the Pacific Ocean . Chile had a population of 17.5 million as of the latest census in 2017 and has a territorial area of 756,102 square kilometers (291,933 sq mi), sharing borders with Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage to the south. The country also controls several Pacific islands, including Juan Fernández , Isla Salas y Gómez , Desventuradas , and Easter Island , and claims about 1,250,000 square kilometers (480,000 sq mi) of Antarctica as

3960-546: The Chilean Antarctic Territory . The capital and largest city of Chile is Santiago , and the national language is Spanish . Spain conquered and colonized the region in the mid-16th century, replacing Inca rule , but failed to conquer the independent Mapuche people who inhabited what is now south-central Chile. Chile emerged as a relatively stable authoritarian republic in the 1830s after their 1818 declaration of independence from Spain . During

4070-754: The Community of Latin American and Caribbean States (CELAC), and the Pacific Alliance , and joined the OECD in 2010. There are various theories about the origin of the word Chile . According to 17th-century Spanish chronicler Diego de Rosales , the Incas called the valley of the Aconcagua Chili by corruption of the name of a Picunche tribal chief ( cacique ) called Tili , who ruled

4180-512: The Maule river in 1812, but did not include the indigenous population or the inhabitants of the province of Chiloé. The population is estimated at 210,567, 86.1% of whom were Spanish or of European descent, 10% of whom were indigenous and 3.7% of whom were mestizos, blacks and mulattos . A 2021 study by Baten and Llorca-Jaña shows that regions with a relatively high share of North European migrants developed faster in terms of numeracy , even if

4290-640: The constitutional referendum , which was put forward by the left-leaning Constitutional Convention . On 17 December 2023, voters rejected a second new constitution proposal in a new constitutional referendum , written by the conservative-led Constitutional Council . A long and narrow coastal Southern Cone country on the west side of the Andes Mountains , Chile stretches over 4,300 km (2,670 mi) north to south, but only 350 km (217 mi) at its widest point east to west and 64 km (40 mi) at its narrowest point east to west, with an average width of 175 km (109 mi). This encompasses

4400-469: 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

4510-650: The "men of Chilli". Ultimately, Almagro is credited with the universalization of the name Chile , after naming the Mapocho valley as such. The older spelling "Chili" was in use in English until the early 20th century before switching to "Chile". Stone tool evidence indicates humans sporadically frequented the Monte Verde valley area as long as 18,500 years ago. About 10,000 years ago, migrating Indigenous peoples settled in fertile valleys and coastal areas of what

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4620-427: The 1960s and 1970s, the country was marked by severe left-right political polarization and turmoil, which culminated in the 1973 Chilean coup d'état that overthrew Salvador Allende 's democratically elected left-wing government . This was followed by a 16-year right-wing military dictatorship under Augusto Pinochet , which resulted in more than 3,000 deaths or disappearances . The regime ended in 1990, following

4730-450: 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

4840-592: The 19th century, Chile experienced significant economic and territorial growth, putting an end to Mapuche resistance in the 1880s and gaining its current northern territory in the War of the Pacific (1879–83) by defeating Peru and Bolivia. In the 20th century, up until the 1970s, Chile underwent a process of democratization and experienced rapid population growth and urbanization , while relying increasingly on exports from copper mining to support its economy . During

4950-517: 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

5060-547: The December 2017 presidential election . On 27 February 2010, Chile was struck by an 8.8 M w earthquake , the fifth largest ever recorded at the time. More than 500 people died (most from the ensuing tsunami ) and over a million people lost their homes. The earthquake was also followed by multiple aftershocks. Initial damage estimates were in the range of US$ 15–30 billion, around 10% to 15% of Chile's real gross domestic product. Chile achieved global recognition for

5170-458: The FTA came into effect. As of 2016, Mexico was the 10th largest importer of Chilean goods, 22% of which was "Forest Manufactures". The total value of goods exchanged has fallen from $ 4.2 billion in 2008 to US$ 3.202 billion in 2016. As of 2013, Chile was ranked as the 22nd largest importer of Mexican goods. The goals of the agreement are described within the agreement as follows: The provisions within

5280-827: The Popular Unity platform also called for nationalization of Chile's major copper mines in the form of a constitutional amendment. The measure was passed unanimously by Congress. As a result, the Richard Nixon administration organized and inserted secret operatives in Chile, in order to swiftly destabilize Allende's government. In addition, US financial pressure restricted international economic credit to Chile. The economic problems were also exacerbated by Allende's public spending, financed mostly through printing money, and by poor credit ratings given by commercial banks. Simultaneously, opposition media, politicians, business guilds and other organizations helped to accelerate

5390-704: The Sapa Inca Tupac Yupanqui and his army. The result of the bloody three-day confrontation known as the Battle of the Maule was that the Inca conquest of the territories of Chile ended at the Maule river . In 1520, while attempting to circumnavigate the globe, Ferdinand Magellan discovered the southern passage now named after him (the Strait of Magellan ) thus becoming the first European to set foot on what

5500-533: The Spanish monarchy (in memory of this day, Chile celebrates its National Day on 18 September each year). After these events, a movement for total independence, under the command of José Miguel Carrera (one of the most renowned patriots) and his two brothers Juan José and Luis Carrera , soon gained a wider following. Spanish attempts to re-impose arbitrary rule during what was called the Reconquista led to

5610-717: The War of the Pacific, Chile became a Naval Power in the Americas, even sending a ship in protests in the Panama crisis of 1885 against the United States intervention in the then Colombian territory. The United States and Chile had the Baltimore crisis which almost became a war as Chile was a potential threat to the intentions of hegemony from the United States in the Western Hemisphere. In 1902 Chile and Argentina received

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5720-463: The agreement cover the following topics: Chile Chile ( / ˈ tʃ ɪ l i / CHIL -ee or / ˈ tʃ ɪ l eɪ / CHIL -ay , Spanish: [ˈtʃile] ), officially the Republic of Chile , is a country in western South America . It is the southernmost country in the world and the closest to Antarctica , stretching along a narrow strip of land between

5830-504: The application and enforcement of the treaty. The Chile–Mexico Free Trade Agreement originally aimed to program and automate liberalization of 95% of products in the tariff universe, but 98.3% of products were freed of tariffs by 2016. Between 1998 and 2001, Mexico's imports from Chile (in millions of USD) increased from $ 552.0 to $ 975.0, and Chile's imports from Mexico (in millions of USD) decreased from $ 859.9 to $ 532.9. By 2005, total trade between Chile and Mexico had increased by 1200% since

5940-688: The area at the time of the Incan conquest in the 15th century. Another theory points to the similarity of the valley of the Aconcagua with that of the Casma Valley in Peru, where there was a town and valley named Chili . Other theories say Chile may derive its name from a Native American word meaning either 'ends of the earth' or 'sea gulls'; from the Mapuche word chilli , which may mean 'where

6050-470: The armed forces bombarded the presidential palace , Allende apparently committed suicide. After the coup, Henry Kissinger told U.S. president Richard Nixon that the United States had "helped" the coup. In 1970, when Allende was first elected, Henry Kissinger had stated "I don't see why we need to stand by and watch a country go Communist due to the irresponsibility of its own people". A military junta, led by General Augusto Pinochet , took control of

6160-626: The banking sector was nationalized . Many enterprises within the copper , coal, iron, nitrate , and steel industries were expropriated , nationalized, or subjected to state intervention. Industrial output increased sharply and unemployment fell during the Allende administration's first year. Allende's program included advancement of workers' interests, replacing the judicial system with "socialist legality", nationalization of banks and forcing others to bankruptcy, and strengthening "popular militias" known as MIR. Started under former President Frei,

6270-555: The candidate of a coalition of 17 political parties called the Concertación , received an absolute majority of votes (55%). President Aylwin served from 1990 to 1994, in what was considered a transition period. In December 1993, Christian Democrat Eduardo Frei Ruiz-Tagle , the son of previous president Eduardo Frei Montalva, led the Concertación coalition to victory with an absolute majority of votes (58%). Frei Ruiz-Tagle

6380-576: The city of Santiago on 12 February 1541. Although the Spanish did not find the extensive gold and silver they sought, they recognized the agricultural potential of Chile's central valley, and Chile became part of the Spanish Empire . Conquest took place gradually, and the Europeans suffered repeated setbacks. A massive Mapuche insurrection that began in 1553 resulted in Valdivia's death and

6490-512: The colony in addition to the Mapuche, as was shown by Sir Francis Drake 's 1578 raid on Valparaíso, the colony's principal port. Chile hosted one of the largest standing armies in the Americas, making it one of the most militarized of the Spanish possessions, as well as a drain on the treasury of the Viceroyalty of Peru . The first general census was conducted by the government of Agustín de Jáuregui between 1777 and 1778; it indicated that

6600-775: The command of John Williams Wilson , the Magallanes Region started to be controlled by country in 1843 , while the Antofagasta Region , at the time in dispute with Bolivia , began to fill with people. After the Chilean Civil War of 1829–1830 in which the conservatives won, under the Joaquín Prieto Administration, the Chilean Constitution of 1833 was written and put into effect with high influence from

6710-412: 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

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6820-452: 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

6930-406: 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

7040-421: 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

7150-467: 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

7260-408: The country to renounce to its claims in the rest of East Patagonia after a dispute that started in 1842 . As a result of the War of the Pacific with Peru and Bolivia (1879–83), Chile expanded its territory northward by almost one-third, eliminating Bolivia's access to the Pacific, and acquired valuable nitrate deposits, the exploitation of which led to an era of national affluence. Chile had joined

7370-802: The country, several hundred committed Chilean revolutionaries joined the Sandinista army in Nicaragua , guerrilla forces in Argentina or training camps in Cuba , Eastern Europe and Northern Africa. In the late 1980s, largely as a result of events such as the 1982 economic collapse and mass civil resistance in 1983–88, the government gradually permitted greater freedom of assembly, speech , and association, to include trade union and political activity. The government launched market-oriented reforms with Hernán Büchi as Minister of Finance. Chile moved toward

7480-628: The country. The years of the regime were marked by human rights violations . Chile actively participated in Operation Condor . In October 1973, at least 72 people were murdered by the Caravan of Death . According to the Rettig Report and Valech Commission , at least 2,115 were killed, and at least 27,265 were tortured (including 88 children younger than 12 years old). In 2011, Chile recognized an additional 9,800 victims, bringing

7590-404: 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

7700-409: 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

7810-520: The destruction of many of the colony's principal settlements. Subsequent major insurrections took place in 1598 and in 1655. Each time the Mapuche and other native groups revolted, the southern border of the colony was driven northward. The abolition of slavery by the Spanish crown in 1683 was done in recognition that enslaving the Mapuche intensified resistance rather than cowing them into submission. Despite royal prohibitions, relations remained strained from continual colonialist interference. Cut off to

7920-538: The discovery of silver ore in Chañarcillo, and the growing trade of the port of Valparaíso, which led to conflict over maritime supremacy in the Pacific with Peru. At the same time, attempts were made to strengthen sovereignty in southern Chile intensifying penetration into Araucanía and colonizing Llanquihue with German immigrants in 1848. Through the founding of Fort Bulnes by the Schooner Ancud under

8030-606: 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

8140-695: The end of his term, Frei had not fully achieved his party's ambitious goals. In the 1970 election, Senator Salvador Allende of the Socialist Party of Chile (then part of the " Popular Unity " coalition which included the Communists, Radicals, Social-Democrats, dissident Christian Democrats, the Popular Unitary Action Movement, and the Independent Popular Action), achieved a partial majority in

8250-548: The essence of the stratified colonial social structure, which was greatly influenced by family politics and the Roman Catholic Church . A strong presidency eventually emerged, but wealthy landowners remained powerful. Bernardo O'Higgins once planned to expand Chile by liberating the Philippines from Spain and incorporating the islands. In this regard he tasked the Scottish naval officer, Lord Thomas Cochrane, in

8360-654: The first rightist President in 20 years, defeating former President Eduardo Frei Ruiz-Tagle of the Concertación , for a four-year term succeeding Bachelet. Due to term limits, Sebastián Piñera did not stand for re-election in 2013, and his term expired in March 2014 resulting in Michelle Bachelet returning to office. Sebastián Piñera succeeded Bachelet again in 2018 as the President of Chile after winning

8470-402: 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

8580-449: 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

8690-427: 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

8800-628: The land ends'" or from the Quechua chiri , 'cold', or tchili , meaning either 'snow' or "the deepest point of the Earth". Another origin attributed to chilli is the onomatopoeic cheele-cheele —the Mapuche imitation of the warble of a bird locally known as trile . The Spanish conquistadors heard about this name from the Incas, and the few survivors of Diego de Almagro 's first Spanish expedition south from Peru in 1535–36 called themselves

8910-459: 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

9020-463: 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 ,

9130-437: 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

9240-426: 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

9350-409: 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,

9460-675: The north by desert, to the south by the Mapuche, to the east by the Andes Mountains, and to the west by the ocean, Chile became one of the most centralized, homogeneous territories in Spanish America. Serving as a sort of frontier garrison , the colony found itself with the mission of forestalling encroachment by both the Mapuche and Spain's European enemies, especially the English and the Dutch . Buccaneers and pirates menaced

9570-523: 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

9680-433: The overall number of migrants was small. This effect might be related to externalities : the surrounding population adopted a similar behavior as the small non-European immigrant group, and new schools were created. Ironically, there might have been positive spillover effects from the educational investment made by migrants, at the same time numeracy might have been reduced by the greater inequality in these regions. However,

9790-403: 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

9900-402: The population consisted of 259,646 inhabitants: 73.5% of European descent , 7.9% mestizos , 8.6% indigenous peoples and 9.8% blacks. Francisco Hurtado, Governor of the province of Chiloé , conducted a census in 1784 and found the population consisted of 26,703 inhabitants, 64.4% of whom were whites and 33.5% of whom were natives. The Diocese of Concepción conducted a census in areas south of

10010-461: The positive effects of immigration were apparently stronger. In 1808, Napoleon's enthronement of his brother Joseph as the Spanish King precipitated the drive by Chile for independence from Spain . A national junta in the name of Ferdinand – heir to the deposed king – was formed on 18 September 1810. The Government Junta of Chile proclaimed an autonomous government for Chile within

10120-517: 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

10230-558: The result from the arbitral award of the Andes resolved by the British Crown . In 1903 the Puna de Atacama dispute was solved. In 1904 Chile and Bolivia signed a Treaty of Peace and Friendship which clarified the border between both countries. The Chilean economy partially degenerated into a system protecting the interests of a ruling oligarchy . By the 1920s, the emerging middle and working classes were powerful enough to elect

10340-428: 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

10450-403: 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

10560-482: The small islands of San Ambrosio and San Felix . These islands are notable because they extend Chile's claim to territorial waters out from its coast into the Pacific Ocean. The northern Atacama Desert contains great mineral wealth, primarily copper and nitrates . The relatively small Central Valley, which includes Santiago, dominates the country in terms of population and agricultural resources. This area

10670-453: 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

10780-401: 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

10890-546: The stand as one of the high-income countries in South America by 1870. On 9 September 1888, Chile took possession of Easter Island by the signing of a mutual will agreement with the local king, thanks to the efforts of the Bishop of Tahiti, Monsignor José María Verdier since the island was constantly attacked by slave merchants. The naval officer Policarpo Toro represented the Chilean Government and Atamu Tekena

11000-535: The successful rescue of 33 trapped miners in 2010. On 5 August 2010, the access tunnel collapsed at the San José copper and gold mine in the Atacama Desert near Copiapó in northern Chile, trapping 33 men 700 meters (2,300 ft) below ground. A rescue effort organized by the Chilean government located the miners 17 days later. All 33 men were brought to the surface two months later on 13 October 2010 over

11110-448: The total number of killed, tortured or imprisoned for political reasons to 40,018. At the national stadium, filled with detainees, one of those tortured and killed was internationally known poet-singer Víctor Jara (see "Music and Dance", below). A new Constitution was approved by a controversial plebiscite on 11 September 1980, and General Pinochet became president of the republic for an eight-year term. After Pinochet obtained rule of

11220-517: The triple minister Diego Portales . Two other civil wars happened in Chile in the 1850s, one in 1851 and the other one in 1859 . Toward the end of the 19th century, the government in Santiago consolidated its position in the south by the Occupation of Araucanía . The Boundary treaty of 1881 between Chile and Argentina confirmed Chilean sovereignty over the Strait of Magellan but also made

11330-554: 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

11440-419: 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

11550-524: Was a de facto dictatorship (although not really comparable in harshness or corruption to the type of military dictatorship that have often bedeviled the rest of Latin America). By relinquishing power to a democratically elected successor, Ibáñez del Campo retained the respect of a large enough segment of the population to remain a viable politician for more than thirty years, in spite of the vague and shifting nature of his ideology. When constitutional rule

11660-425: 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

11770-590: 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

11880-632: Was restored in 1932, a strong middle-class party, the Radicals, emerged. It became the key force in coalition governments for the next 20 years. During the period of Radical Party dominance (1932–52), the state increased its role in the economy. In 1952, voters returned Ibáñez del Campo to office for another six years. Jorge Alessandri succeeded Ibáñez del Campo in 1958, bringing Chilean conservatism back into power democratically for another term. The 1964 presidential election of Christian Democrat Eduardo Frei Montalva by an absolute majority initiated

11990-608: Was succeeded in 2000 by Socialist Ricardo Lagos , who won the presidency in an unprecedented runoff election against Joaquín Lavín of the rightist Alliance for Chile . In January 2006, Chileans elected their first female president, Michelle Bachelet Jeria , of the Socialist Party, defeating Sebastián Piñera , of the National Renewal party, extending the Concertación governance for another four years. In January 2010, Chileans elected Sebastián Piñera as

12100-536: Was the head of the Council of Rapanui. The Rapa Nui elders ceded sovereignty, without renouncing their titles as chiefs, the ownership of their lands, the validity of their culture and traditions and on equal terms. The Rapa Nui sold nothing, they were integrated in equal conditions to Chile. The 1891 Chilean Civil War brought about a redistribution of power between the President and Congress, and Chile established

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