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90-734: Vedanta Resources Limited is a diversified mining company headquartered in London , United Kingdom. It is the largest mining and non-ferrous metals company in India and has mining operations in Australia and Zambia and oil and gas operations in three countries. Its main products are Zinc , Lead , Silver , Oil & Gas , Iron Ore , Steel , Aluminium and Power . It has also developed commercial power stations in India in Odisha (2,400 MW) and Punjab (1,980 MW). The company with 20,000 employees

180-553: A Portuguese company, Sesa Goa was purchased by Vedanta (then known as Sterlite industries) in the 1990s. As of 30 June 2018, the company is owned 50% by the promoters (under the names of 12 members of the Agarwal family) and 50% by the public. This includes ownership by and "Westglobe limited", "Twinstar holdings", Finsider international and mutual funds ( ICICI Prudential ), foreign portfolio investors (17%), LIC India (6%) and Citibank New York (4%). Sterlite Energy : Sterlite Energy

270-636: A hopper and a shaking screen or trommel which frees the desired minerals from the waste gravel. The minerals are then concentrated using sluices or jigs. Large drills are used to sink shafts, excavate stopes, and obtain samples for analysis. Trams are used to transport miners, minerals and waste. Lifts carry miners into and out of mines, and move rock and ore out, and machinery in and out, of underground mines. Huge trucks, shovels and cranes are employed in surface mining to move large quantities of overburden and ore. Processing plants use large crushers, mills, reactors, roasters and other equipment to consolidate

360-883: A mass of actual rock. Both types of ore deposit, placer or lode, are mined by both surface and underground methods. Some mining, including much of the rare earth elements and uranium mining , is done by less-common methods, such as in-situ leaching : this technique involves digging neither at the surface nor underground. The extraction of target minerals by this technique requires that they be soluble, e.g., potash , potassium chloride , sodium chloride , sodium sulfate , which dissolve in water. Some minerals, such as copper minerals and uranium oxide , require acid or carbonate solutions to dissolve. Explosives in Mining Explosives have been used in surface mining and sub-surface mining to blast out rock and ore intended for processing. The most common explosive used in mining

450-426: A mining operation. Once the analysis determines a given ore body is worth recovering, development begins to create access to the ore body. The mine buildings and processing plants are built, and any necessary equipment is obtained. The operation of the mine to recover the ore begins and continues as long as the company operating the mine finds it economical to do so. Once all the ore that the mine can produce profitably

540-503: A more sustainable future, the demand for metals is set to skyrocket. Between 2022 and 2050, an estimated 7 billion metric tons of metals will need to be extracted. Steel will account for the largest portion of this total at 5 billion tons, followed by aluminum at 950 million tons, copper at 650 million tons, graphite at 170 million tons, nickel at 100 million tons, and other metals. Notably, the energy expenditure required to extract these metals will soon surpass that of coal mining, highlighting

630-763: A negative environmental impact, both during the mining activity and after the mine has closed. Hence, most of the world's nations have passed regulations to decrease the impact; however, the outsized role of mining in generating business for often rural, remote or economically depressed communities means that governments often fail to fully enforce such regulations. Work safety has long been a concern as well, and where enforced, modern practices have significantly improved safety in mines. Unregulated, poorly regulated or illegal mining , especially in developing economies , frequently contributes to local human rights violations and environmental conflicts . Mining can also perpetuate political instability through resource conflicts . Since

720-406: A proposed mine, extraction of the desired materials, and final reclamation or restoration of the land after the mine is closed. Mining materials are often obtained from ore bodies, lodes , veins , seams , reefs , or placer deposits . The exploitation of these deposits for raw materials is dependent on investment, labor, energy, refining, and transportation cost. Mining operations can create

810-583: A public listed company in India since 1988, and its equity shares are listed and traded on the NSE and the BSE, and are also listed and traded on the NYSE in the form of ADSs. Vedanta owns 53.9% of Sterlite and has management control of the company. Protest by Public of Tuticorin started for not following Environmental Clearance Issues. The Tamil Nadu Pollution Control Board (TNPCB) accused the factory of releasing noxious gas in

900-735: A report by the Wildlife Institute of India as well as independent reports/studies carried out by civil society groups. In January 2009, thousands of locals formed a human chain around the hill in protest at the plans to start bauxite mining in the area. The Union Environment Ministry in August 2010 rejected earlier clearances granted to a joint venture led by the Vedanta Group company Sterlite Industries for mining bauxite from Niyamgiri hills. Vedanta's Alumina Refinery in Lanjigarh

990-408: A strong inducement to extract these metals or to lease the deposits and collect royalties from mine operators. English, German , and Dutch capital combined to finance extraction and refining . Hundreds of German technicians and skilled workers were brought over; in 1642 a colony of 4,000 foreigners was mining and smelting copper at Keswick in the northwestern mountains. Use of water power in

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1080-508: A strong signal to companies that trample on tribal peoples' rights: we will not bankroll your abuses. Anybody that has shares in Vedanta should sell them today if they care about human rights." Vedanta responded by expressing disappointment at the church's actions, and that it is "fully committed to pursuing its investments in a responsible manner, respecting the environment and human rights". The NGO Amnesty International has also criticised

1170-651: Is ammonium nitrate . Between 1870 and 1920, in Queensland Australia, an increase in mining accidents lead to more safety measures surrounding the use of explosives for mining. In the United States of America, between 1990 and 1999, about 22.3 billion kilograms of explosives were used in mining quarrying and other industries; Moreover " coal mining used 66.4%, nonmetal mining and quarrying 13.5%, metal mining 10.4%, construction 7.1%, and all other users 2.6%". Artisanal and small-scale mining (ASM)

1260-811: Is a blanket term for a type of subsistence mining involving a miner who may or may not be officially employed by a mining company but works independently, mining minerals using their own resources, usually by hand. While there is no completely coherent definition for ASM, artisanal mining generally includes miners who are not officially employed by a mining company and use their own resources to mine. As such, they are part of an informal economy . ASM also includes, in small-scale mining, enterprises or individuals that employ workers for mining, but who generally still use similar manually-intensive methods as artisanal miners (such as working with hand tools). In addition, ASM can be characterized as distinct from large-scale mining (LSM) by less efficient extraction of pure minerals from

1350-476: Is done by removing surface vegetation, dirt, and bedrock to reach buried ore deposits. Techniques of surface mining include: open-pit mining , which is the recovery of materials from an open pit in the ground; quarrying , identical to open-pit mining except that it refers to sand, stone and clay; strip mining , which consists of stripping surface layers off to reveal ore underneath; and mountaintop removal , commonly associated with coal mining, which involves taking

1440-574: Is headquartered in Mumbai. Sterlite owns 100.0% of Sterlite Energy and has management control of the company. In 1992, Anil Agarwal created the Vedanta Foundation as the vehicle through which the group companies would carry out their philanthropic programs and activities. In the financial year 2013–14, the Vedanta group companies and the Vedanta foundation invested US$ 49.0 million in building hospitals , schools and infrastructure, conserving

1530-613: Is mining upward, creating a sloping underground room, long wall mining , which is grinding a long ore surface underground, and room and pillar mining, which is removing ore from rooms while leaving pillars in place to support the roof of the room. Room and pillar mining often leads to retreat mining , in which supporting pillars are removed as miners retreat, allowing the room to cave in, thereby loosening more ore. Additional sub-surface mining methods include hard rock mining , bore hole mining, drift and fill mining, long hole slope mining, sub level caving, and block caving . Heavy machinery

1620-484: Is much more common, and produces, for example, 85% of minerals (excluding petroleum and natural gas) in the United States, including 98% of metallic ores. Targets are divided into two general categories of materials: placer deposits , consisting of valuable minerals contained within river gravels, beach sands, and other unconsolidated materials ; and lode deposits , where valuable minerals are found in veins, in layers, or in mineral grains generally distributed throughout

1710-413: Is not of immediate interest to the miner. The total movement of ore and waste constitutes the mining process. Often more waste than ore is mined during the life of a mine, depending on the nature and location of the ore body. Waste removal and placement is a major cost to the mining operator, so a detailed characterization of the waste material forms an essential part of the geological exploration program for

1800-595: Is primarily owned by the family of Anil Agarwal through Volcan Investments , a holding vehicle with a 61.7% stake in the business. Vedanta limited (formerly Sesa Goa / Sterlite ) is one of the many Indian subsidiaries of Vedanta resources and operates iron ore mines in Goa. Vedanta was listed on the London Stock Exchange and was a constituent of the FTSE 250 Index until chairman, Anil Agarwal's offer to take

1890-584: Is recovered, reclamation can begin, to make the land used by the mine suitable for future use. Technical and economic challenges notwithstanding, successful mine development must also address human factors. Working conditions are paramount to success, especially with regard to exposures to dusts, radiation, noise, explosives hazards, and vibration, as well as illumination standards. Mining today increasingly must address environmental and community impacts, including psychological and sociological dimensions. Thus, mining educator Frank T. M. White (1909–1971), broadened

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1980-599: Is the largest producer of diamonds in Africa, with an estimated 12 million carats in 2019. Other types of mining reserves in Africa include cobalt , bauxite , iron ore , coal, and copper . Gold and coal mining started in Australia and New Zealand in the 19th century. Nickel has become important in the economy of New Caledonia . In Fiji , in 1934, the Emperor Gold Mining Company Ltd. established operations at Vatukoula , followed in 1935 by

2070-423: Is to conduct a feasibility study to evaluate the financial viability, the technical and financial risks, and the robustness of the project. This is when the mining company makes the decision whether to develop the mine or to walk away from the project. This includes mine planning to evaluate the economically recoverable portion of the deposit, the metallurgy and ore recoverability, marketability and payability of

2160-419: Is used in mining to explore and develop sites, to remove and stockpile overburden, to break and remove rocks of various hardness and toughness, to process the ore, and to carry out reclamation projects after the mine is closed. Bulldozers, drills, explosives and trucks are all necessary for excavating the land. In the case of placer mining , unconsolidated gravel, or alluvium , is fed into machinery consisting of

2250-521: The Greek author Diodorus Siculus , who mentions fire-setting as one method used to break down the hard rock holding the gold . One of the complexes is shown in one of the earliest known mining maps. The miners crushed the ore and ground it to a fine powder before washing the powder for the gold dust known as the dry and wet attachment processes. Mining in Europe has a very long history. Examples include

2340-852: The Joseph Rowntree Charitable Trust , the Marlborough Ethical Fund, Millfield House Foundation and PGGM . The Economic Times criticised the project in an editorial, stating that if the mine goes ahead it will "impoverish a defenceless populace, perhaps to extinction." In July 2010, the Chief Secretary of the Indian state of Orissa ordered a new investigation into the rights of the Dongria Kondh tribe affected by Vedanta Resources' bauxite mine, in what Survival International characterised as

2430-645: The Supreme Court of the United Kingdom confirmed that Vedanta could be sued in England concerning business liability for human rights violations and environmental damage. In July 2010, Sterlite Industries, a subsidiary of Vedanta Group, received a tax notice of about ₹ 3.24 billion (US$ 39 million), and was charged with violating several rules by the excise department in India. Excise officials charged Sterlite Industries with misdeclaration because

2520-517: The argentiferous galena in the mines of Cartagena ( Cartago Nova ), Linares ( Castulo ), Plasenzuela and Azuaga , among many others. Spain was one of the most important mining regions, but all regions of the Roman Empire were exploited. In Great Britain the natives had mined minerals for millennia , but after the Roman conquest , the scale of the operations increased dramatically, as

2610-836: The greenstone of the Langdale axe industry based in the English Lake District . The oldest-known mine on archaeological record is the Ngwenya Mine in Eswatini (Swaziland) , which radiocarbon dating shows to be about 43,000 years old. At this site Paleolithic humans mined hematite to make the red pigment ochre . Mines of a similar age in Hungary are believed to be sites where Neanderthals may have mined flint for weapons and tools. Ancient Egyptians mined malachite at Maadi . At first, Egyptians used

2700-742: The "...third major blow to Vedanta in a month". A four-member panel set up by the government of India in the Ministry of Environment and Forests investigated the bauxite mining proposal over Niyamgiri near Lanjigarh in the districts of Kalahandi and Rayagada in Orissa . The area has been the traditional habitat of two particularly vulnerable tribal groups, the Dongria Kondh and the Kutia Kondh. The committee submitted its report on 16 August 2010, saying "The Vedanta Company has consistently violated

2790-509: The 21st century begins, a globalized mining industry of large multinational corporations has arisen. Peak minerals and environmental impacts have also become a concern. Different elements, particularly rare-earth minerals , have begun to increase in demand as a result of new technologies. In 2023, 8.5 billion metric tons of coal were extracted from the Earth's crust. However, as the global economy transitions away from fossil fuels and toward

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2880-680: The 7th century to the 14th century. Gold was often traded to Mediterranean economies that demanded gold and could supply salt , even though much of Africa was abundant with salt due to the mines and resources in the Sahara desert . The trading of gold for salt was mostly used to promote trade between the different economies. Since the Great Trek in the 19th century, after, gold and diamond mining in Southern Africa has had major political and economic impacts. The Democratic Republic of Congo

2970-657: The Balco smelter in Korba, Chhattisgarh collapsed on 23 September 2009, killing at least 40 workers. Balco and GDCL management have been accused of negligence in the incident. On 17 November 2020, a mining-related "geotechnical incident" caused a landslide at the Gamsberg Mine in South Africa and 10 miners became trapped; with mining halted, eight miners were rescued, one died and one body was missing. On 18 January 2021,

3060-743: The Forest Conservation Act [FCA], the Forest Rights Act [FRA], the Environment Protection Act [EPA] and the Orissa Forest Act in active collusion with the State officials. Allowing mining by depriving two primitive tribal groups of their rights over the proposed mining site to benefit a private company would shake the faith of the tribal people in the laws of the land ". Based on a panel report,

3150-675: The French crown to operate mines in 1733, becoming "the first practical miner on Lake Superior"; seven years later, mining was halted by an outbreak between Sioux and Chippewa tribes. Mining in the United States became widespread in the 19th century, and the United States Congress passed the General Mining Act of 1872 to encourage mining of federal lands. As with the California Gold Rush in

3240-643: The Loloma Gold Mines, N.L., and then by Fiji Mines Development Ltd. (aka Dolphin Mines Ltd.). These developments ushered in a “mining boom”, with gold production rising more than a hundred-fold, from 931.4 oz in 1934 to 107,788.5 oz in 1939, an order of magnitude then comparable to the combined output of New Zealand and Australia's eastern states. During prehistoric times, early Americans mined large amounts of copper along Lake Superior 's Keweenaw Peninsula and in nearby Isle Royale ; metallic copper

3330-512: The NSE and BSE. Sterlite owns 64.9% of the share capital in HZL and has management control. Sterlite has a call option to acquire the government of India's remaining ownership interest. Vedanta's iron ore mining operations in India are operated under the umbrella of Vedanta Limited , a company headquartered in Panaji , India. It has mining operations in Goa and Karnataka. Originally founded as Sesa Goa,

3420-481: The Romans needed Britannia 's resources, especially gold , silver , tin , and lead . Roman techniques were not limited to surface mining. They followed the ore veins underground once opencast mining was no longer feasible. At Dolaucothi they stoped out the veins and drove adits through bare rock to drain the stopes. The same adits were also used to ventilate the workings, especially important when fire-setting

3510-598: The Spanish to pulverize ore after being mined. This device was powered by animals and used the same principles used for grain threshing . Much of the knowledge of medieval mining techniques comes from books such as Biringuccio 's De la pirotechnia and probably most importantly from Georg Agricola 's De re metallica (1556). These books detail many different mining methods used in German and Saxon mines. A prime issue in medieval mines, which Agricola explains in detail,

3600-756: The Umm el-Sawwan site; gypsum was used to make funerary items for private tombs. Other minerals mined in Egypt from the Old Kingdom (2649-2134 BC) until the Roman Period (30 BC-AD 395) including granite , sandstone , limestone , basalt , travertine , gneiss , galena , and amethyst . Mining in Egypt occurred in the earliest dynasties. The gold mines of Nubia were among the largest and most extensive of any in Ancient Egypt. These mines are described by

3690-432: The air. It said sulphur-dioxide levels had gone off the charts on the night of 23 March in the year 2013. It showed a reading of 2939.55 mg/cubic metre against the prescribed limit of 1250 mg/ cubic metre more people where affected by cancer and other breathing disorders but the Indian government did not take any action. Konkola Copper Mines : Vedanta owns 79.4% of KCM's share capital and have management control of

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3780-489: The assets of Asarco , a copper mining business, out of Chapter 11 for US$ 2.6 billion . and in 2010, it acquired Anglo-American's portfolio of Zinc assets in South Africa, Namibia and Ireland. In 2011, Vedanta acquired 58.5% controlling stake in Cairn India , India's largest private sector oil & gas company and in 2013, Sterlite Industries and Sesa Goa announced a merger. The merger took place in August 2013 and

3870-624: The beginning of civilization, people have used stone , clay and, later, metals found close to the Earth's surface. These were used to make early tools and weapons; for example, high quality flint found in northern France , southern England and Poland was used to create flint tools . Flint mines have been found in chalk areas where seams of the stone were followed underground by shafts and galleries. The mines at Grimes Graves and Krzemionki are especially famous, and like most other flint mines, are Neolithic in origin (c. 4000–3000 BC). Other hard rocks mined or collected for axes included

3960-528: The bright green malachite stones for ornamentations and pottery . Later, between 2613 and 2494 BC, large building projects required expeditions abroad to the area of Wadi Maghareh in order to secure minerals and other resources not available in Egypt itself. Quarries for turquoise and copper were also found at Wadi Hammamat , Tura , Aswan and various other Nubian sites on the Sinai Peninsula and at Timna . Quarries for gypsum were found at

4050-518: The company confirmed that mining operations had resumed. In respect of bauxite mines at Lanjigarh , Orissa , public interest litigations were filed in 2004 by Indian non-government organisations led by the People's Union for Civil Liberties to the supreme court sub-committee regarding the potential environmental impact of the mines. The Ministry of Environment and Forests received reports from expert organisations and has submitted its recommendations to

4140-480: The company is alleged to have tried shipping out copper waste for the purpose of separating gold and silver when the waste also contained other precious metals like platinum and palladium. Vendanta also owes the Income Tax Department ₹10,247 crore as retrospective tax as of January 2014. Mining Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of

4230-654: The company private went unconditional in September 2018. The company was founded in Bombay (now Mumbai ) in 1976 by Anil Agarwal , as a scrap-metal dealership. In 1979, he acquired the Shamsher Sterling Corporation (subsequently renamed Sterlite Industries), a manufacturer of power and control cables. The company acquired a majority stake in Balco , the Indian state aluminium business, in 2001. It

4320-622: The company's record on human rights. It has said, "[I]t is clear that Vedanta Resources and its subsidiaries [...] have failed to respect the human rights of the people of Lanjigarh and the Niyamgiri Hills" adding, "The proposed bauxite mine [...] threatens the survival of a protected Indigenous community [...] However, these risks have been largely ignored and consultation with and disclosure of information to affected communities have been almost non-existent." Several shareholders sold their shares because of human rights concerns. This includes

4410-617: The company. KCM's other shareholder is ZCCM Investment Holdings plc. The government of Zambia has a controlling stake in ZCCM Investment Holdings plc. Copper Mines of Tasmania : CMT is headquartered in Queenstown, Tasmania . Sterlite owns 100.0% of CMT and has management control of the company. Hindustan Zinc : HZL is headquartered in Udaipur in the state of Rajasthan . HZL's equity shares are listed and traded on

4500-547: The consolidated group was then called Sesa Sterlite Ltd (now Vedanta Limited ). In June 2018, Vedanta acquired 90% stake in Electrosteel Steels, a steel producer. In September 2018, the company announced that Anil Agarwal would be taking Vedanta Resources private on 1 October 2018. Sterlite Industries (India): Sterlite is registered office headquartered in Tuticorin , Tamil Nadu , India. Sterlite has been

4590-417: The cutter-head is progressively launched further into the coal seam. High wall mining can produce thousands of tons of coal in contour-strip operations with narrow benches, previously mined areas, trench mine applications and steep-dip seams. Sub-surface mining consists of digging tunnels or shafts into the earth to reach buried ore deposits. Ore, for processing, and waste rock, for disposal, are brought to

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4680-497: The environment and funding community programs that improve health, education and livelihood of over 4.1 million people. The initiatives were undertaken in partnership with the government and non-governmental organizations (NGOs). Among his inspirations, Agarwal counts Andrew Carnegie and David Rockefeller who built public works with their fortunes, and Bill Gates . The activities funded by his philanthropy are focused on child welfare, women empowerment and education . Anil Agarwal

4770-465: The first form going into administration in 1998 the mine was then acquired in 1999 by Monte Cello BV. First it operated as a subsidiary and then acquired by Sterlite Industries (India) Limited. It is now owned by Vedanta Resources . Its mine output goes to supply the companies copper smelter in Tuticorin, India . Production stopped at the mine in January 2014 following three deaths. Its reopening

4860-698: The focus to the “total environment of mining”, including reference to community development around mining, and how mining is portrayed to an urban society, which depends on the industry, although seemingly unaware of this dependency. He stated, “[I]n the past, mining engineers have not been called upon to study the psychological, sociological and personal problems of their own industry – aspects that nowadays are assuming tremendous importance. The mining engineer must rapidly expand his knowledge and his influence into these newer fields.” Mining techniques can be divided into two common excavation types: surface mining and sub-surface (underground) mining . Today, surface mining

4950-487: The form of water mills was extensive. The water mills were employed in crushing ore, raising ore from shafts, and ventilating galleries by powering giant bellows . Black powder was first used in mining in Selmecbánya , Kingdom of Hungary (now Banská Štiavnica , Slovakia) in 1627. Black powder allowed blasting of rock and earth to loosen and reveal ore veins. Blasting was much faster than fire-setting and allowed

5040-474: The government of India has served a show cause notice on the company on why its Stage I environment clearance should not be cancelled. In October 2017, London's Court of Appeal in the case of Lungowe v Vedanta Resources plc ruled that nearly 2,000 Zambians could sue Vedanta Resources plc as a parent company in English courts over alleged pollution of their village. In concluding the same litigation in 2019,

5130-400: The growing importance of sustainable metal extraction practices. The process of mining from discovery of an ore body through extraction of minerals and finally to returning the land to its natural state consists of several distinct steps. The first is discovery of the ore body, which is carried out through prospecting or exploration to find and then define the extent, location and value of

5220-573: The increased use of fertiliser by farmers. It was reported in August 2015 that villagers in Chingola, Zambia can smell and taste toxic pollution/leaks from the largest copper mine in Africa owned by KCM. Vedanta Resources was ranked as "the worst of the 12 biggest diversified miners at reducing emissions and planning for climate change", according to the Digging Deep report (CDP). A chimney under construction by Gannon Dunkerley & Company at

5310-535: The metals due to the difficulties of transporting them, but the copper was eventually traded throughout the continent along major river routes. In the early colonial history of the Americas, "native gold and silver was quickly expropriated and sent back to Spain in fleets of gold- and silver-laden galleons", the gold and silver originating mostly from mines in Central and South America. Turquoise dated at 700 AD

5400-768: The mid-19th century, mining for minerals and precious metals, along with ranching , became a driving factor in the U.S. Westward Expansion to the Pacific coast. With the exploration of the West, mining camps sprang up and "expressed a distinctive spirit, an enduring legacy to the new nation"; Gold Rushers would experience the same problems as the Land Rushers of the transient West that preceded them. Aided by railroads, many people traveled West for work opportunities in mining. Western cities such as Denver and Sacramento originated as mining towns. When new areas were explored, it

5490-442: The mid-sixteenth century. On the continent, mineral deposits belonged to the crown, and this regalian right was stoutly maintained. But in England, royal mining rights were restricted to gold and silver (of which England had virtually no deposits) by a judicial decision of 1568 and a law in 1688. England had iron , zinc , copper , lead , and tin ores. Landlords who owned the base metals and coal under their estates then had

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5580-432: The minehead, where the water was stored in large reservoirs and tanks. When a full tank was opened, the flood of water sluiced away the overburden to expose the bedrock underneath and any gold-bearing veins. The rock was then worked by fire-setting to heat the rock, which would be quenched with a stream of water. The resulting thermal shock cracked the rock, enabling it to be removed by further streams of water from

5670-581: The mineral-rich material and extract the desired compounds and metals from the ore. Copper Mines of Tasmania Copper Mines of Tasmania is the successor company to the Mount Lyell Mining and Railway Company that operated in Queenstown, Tasmania for just short of one hundred years. The first form of the company existed during the time of the Mount Lyell Remediation and Research and Demonstration Program . Following

5760-431: The mining of previously impenetrable metals and ores. In 1762, one of the world's first mining academies was established in the same town there. The widespread adoption of agricultural innovations such as the iron plowshare , as well as the growing use of metal as a building material, was also a driving force in the tremendous growth of the iron industry during this period. Inventions like the arrastra were often used by

5850-405: The ore body. This leads to a mathematical resource estimation to estimate the size and grade of the deposit. This estimation is used to conduct a pre-feasibility study to determine the theoretical economics of the ore deposit. This identifies, early on, whether further investment in estimation and engineering studies is warranted and identifies key risks and areas for further work. The next step

5940-462: The ore concentrates, engineering concerns, milling and infrastructure costs, finance and equity requirements, and an analysis of the proposed mine from the initial excavation all the way through to reclamation. The proportion of a deposit that is economically recoverable is dependent on the enrichment factor of the ore in the area. To gain access to the mineral deposit within an area it is often necessary to mine through or remove waste material which

6030-442: The ore, lower wages, decreased occupational safety, benefits, and health standards for miners, and a lack of environmental protection measures. Artisanal miners often undertake the activity of mining seasonally. For example, crops are planted in the rainy season , and mining is pursued in the dry season . However, they also frequently travel to mining areas and work year-round. There are four broad types of ASM: Surface mining

6120-570: The overhead tanks. The Roman miners used similar methods to work cassiterite deposits in Cornwall and lead ore in the Pennines . Sluicing methods were developed by the Romans in Spain in 25 AD to exploit large alluvial gold deposits, the largest site being at Las Medulas , where seven long aqueducts tapped local rivers and sluiced the deposits. The Romans also exploited the silver present in

6210-465: The plant including a small increase of the pH value of the river Vamshadhara below the refinery and a high level of SPM in the stack emissions. In October 2009 it was reported that the British government has criticised Vedanta for its treatment of the Dongria Kondh tribe in Orissa, India. The company refused to co-operate with the British government and with an OECD investigation. It has rejected charges of environmental damage, saying it may be related to

6300-431: The remaining part of a coal seam previously exploited by other surface-mining techniques has too much overburden to be removed but can still be profitably exploited from the side of the artificial cliff made by previous mining. A typical cycle alternates sumping, which undercuts the seam, and shearing, which raises and lowers the cutter-head boom to cut the entire height of the coal seam. As the coal recovery cycle continues,

6390-446: The shafts could no longer be pumped dry with the available technology. Although an increased use of banknotes , credit and copper coins during this period did decrease the value of, and dependence on, precious metals , gold and silver still remained vital to the story of medieval mining. Due to differences in the social structure of society, the increasing extraction of mineral deposits spread from central Europe to England in

6480-567: The silver mines of Laurium , which helped support the Greek city state of Athens . Although they had over 20,000 slaves working them, their technology was essentially identical to their Bronze Age predecessors. At other mines, such as on the island of Thassos , marble was quarried by the Parians after they arrived in the 7th century BC. The marble was shipped away and was later found by archaeologists to have been used in buildings including

6570-662: The supreme court. The sub-committee has found "blatant violations" of environmental regulations and grave concerns about the impact of the Niyamgiri mine on both the environment and the local tribal population. The committee recommended to the court that mining in such an ecologically sensitive area should not be permitted. In February 2010, the Church of England decided to disinvest from the company on ethical grounds. The Director of Survival International, Stephen Corry , said, "The Church’s unprecedented and very welcome decision sends

6660-474: The surface through the tunnels and shafts. Sub-surface mining can be classified by the type of access shafts used, and the extraction method or the technique used to reach the mineral deposit. Drift mining uses horizontal access tunnels, slope mining uses diagonally sloping access shafts, and shaft mining uses vertical access shafts. Mining in hard and soft rock formations requires different techniques. Other methods include shrinkage stope mining , which

6750-602: The tomb of Amphipolis. Philip II of Macedon , the father of Alexander the Great , captured the gold mines of Mount Pangeo in 357 BC to fund his military campaigns. He also captured gold mines in Thrace for minting coinage, eventually producing 26 tons per year. However, it was the Romans who developed large-scale mining methods, especially the use of large volumes of water brought to the minehead by numerous aqueducts . The water

6840-448: The top of a mountain off to reach ore deposits at depth. Most placer deposits, because they are shallowly buried, are mined by surface methods. Finally, landfill mining involves sites where landfills are excavated and processed. Landfill mining has been thought of as a long-term solution to methane emissions and local pollution. High wall mining, which evolved from auger mining, is another form of surface mining. In high wall mining,

6930-628: The top slats. Many examples of such devices have been found in old Roman mines and some examples are now preserved in the British Museum and the National Museum of Wales . Mining as an industry underwent dramatic changes in medieval Europe . The mining industry in the early Middle Ages was mainly focused on the extraction of copper and iron . Other precious metals were also used, mainly for gilding or coinage. Initially, many metals were obtained through open-pit mining , and ore

7020-469: The world's gold, followed by the establishment of large mines such as the Mount Morgan Mine , which ran for nearly a hundred years, Broken Hill ore deposit (one of the largest zinc-lead ore deposits), and the iron ore mines at Iron Knob . After declines in production, another boom in mining occurred in the 1960s. In the early 21st century, Australia remains a major world mineral producer. As

7110-474: The world, which was increasingly demanding copper for electrical and household goods. Canada's mining industry grew more slowly than did the United States due to limitations in transportation, capital, and U.S. competition; Ontario was the major producer of the early 20th century with nickel, copper, and gold. Meanwhile, Australia experienced the Australian gold rushes and by the 1850s was producing 40% of

7200-521: Was criticised by the Orissa State Pollution Control Board (the statutory environmental regulation body) for air pollution and water pollution in the area. According to Amnesty International, local people reported dust, allegedly from the plant, settling on clothes, crops and food. Vedanta officials claimed there was no dust pollution from the plant at all. An environmental inspection of the plant reported water pollution by

7290-494: Was first listed on the London Stock Exchange in 2003 when, as Vedanta Resources, it raised US$ 876 million through an initial public offering . In 2006, Vedanta acquired Sterlite Gold, a gold mining business, and in 2007, Vedanta Resources bought a 51% stake in Sesa Goa , India's largest producer-exporter of iron ore , and the company became listed on NYSE with a US$ 2 billion ADS issue. In 2008, Vedanta bought certain of

7380-580: Was inspired by Bill Gates . Vedanta has been criticised by human rights and activist groups, including Survival International , Amnesty International and Niyamgiri Surakshya Samiti because of the company's operations in Niyamgiri hills in Odisha , India that are said to threaten the lives of the Dongria Kondh people who populate this region. The Niyamgiri hills are also claimed to be an important wildlife habitat in Eastern Ghats of India as per

7470-628: Was mined in pre-Columbian America; in the Cerillos Mining District in New Mexico , an estimate of "about 15,000 tons of rock had been removed from Mt. Chalchihuitl using stone tools before 1700." In 1727 Louis Denys (Denis) (1675–1741), sieur de La Ronde – brother of Simon-Pierre Denys de Bonaventure and the son-in-law of René Chartier – took command of Fort La Pointe at Chequamegon Bay ; where natives informed him of an island of copper. La Ronde obtained permission from

7560-576: Was primarily extracted from shallow depths, rather than through deep mine shafts. Around the 14th century , the growing use of weapons , armour , stirrups , and horseshoes greatly increased the demand for iron. Medieval knights , for example, were often laden with up to 100 pounds (45 kg) of plate or chain link armour in addition to swords , lances and other weapons. The overwhelming dependency on iron for military purposes spurred iron production and extraction processes. The silver crisis of 1465 occurred when all mines had reached depths at which

7650-623: Was ranked second in Hurun India Philanthropy List 2014 for his personal donation of ₹1,796 crore (about US$ 36 million). He was ranked 25th in the Hurun India Rich List with a personal fortune of ₹12,316 crore. In 2015, the Vedanta group in partnership with Ministry for Women and Child development inaugurated the first "Nand Ghar" or modern anganwadi, of the 4,000 planned to set up. Agarwal has pledged to donate 75% of his family's wealth to charity, saying he

7740-406: Was still present near the surface in colonial times. Indigenous peoples used Lake Superior copper from at least 5,000 years ago; copper tools, arrowheads, and other artifacts that were part of an extensive native trade-network have been discovered. In addition, obsidian , flint , and other minerals were mined, worked, and traded. Early French explorers who encountered the sites made no use of

7830-411: Was the removal of water from mining shafts. As miners dug deeper to access new veins, flooding became a very real obstacle. The mining industry became dramatically more efficient and prosperous with the invention of mechanically- and animal-driven pumps. Iron metallurgy in Africa dates back over four thousand years. Gold became an important commodity for Africa during the trans-Saharan gold trade from

7920-403: Was used for a variety of purposes, including removing overburden and rock debris, called hydraulic mining , as well as washing comminuted , or crushed, ores and driving simple machinery. The Romans used hydraulic mining methods on a large scale to prospect for the veins of ore, especially using a now-obsolete form of mining known as hushing . They built numerous aqueducts to supply water to

8010-465: Was used. At other parts of the site, they penetrated the water table and dewatered the mines using several kinds of machines, especially reverse overshot water-wheels . These were used extensively in the copper mines at Rio Tinto in Spain, where one sequence comprised 16 such wheels arranged in pairs, and lifting water about 24 metres (79 ft). They were worked as treadmills with miners standing on

8100-539: Was usually the gold ( placer and then lode ) and then silver that were taken into possession and extracted first. Other metals would often wait for railroads or canals, as coarse gold dust and nuggets do not require smelting and are easy to identify and transport. In the early 20th century, the gold and silver rush to the western United States also stimulated mining for coal as well as base metals such as copper, lead, and iron. Areas in modern Montana, Utah, Arizona, and later Alaska became predominant suppliers of copper to

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