The Chalcolithic was an archaeological period characterized by the increasing use of smelted copper. It followed the Neolithic and preceded the Bronze Age. It occurred at different periods in different areas, but was absent in some parts of the world, such as Russia, where there was no well-defined Copper Age between the Stone and Bronze ages. Stone tools were still predominantly used during this period.
Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their mixtures, which are known as alloys.
Smelting is a process of applying heat and a chemical reducing agent to an ore to extract a desired base metal product. It is a form of extractive metallurgy that is used to obtain many metals such as iron, copper, silver, tin, lead and zinc. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal behind. The reducing agent is commonly a fossil fuel source of carbon, such as carbon monoxide from incomplete combustion of coke—or, in earlier times, of charcoal. The oxygen in the ore binds to carbon at high temperatures as the chemical potential energy of the bonds in carbon dioxide is lower than that of the bonds in the ore.
Chalcopyrite ( KAL-kə-PY-ryte, -koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green-tinged black.
ASARCO is a mining, smelting, and refining company based in Tucson, Arizona, which mines and processes primarily copper. The company has been a subsidiary of Grupo México since 1999.
Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper ores consists of a series of physical, chemical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, local environmental regulations, and other factors.
Anaconda, county seat of Deer Lodge County, which has a consolidated city-county government, is located in southwestern Montana, United States. Located at the foot of the Anaconda Range, the Continental Divide passes within 8 mi (13 km) south of the community. As of the 2020 census the population of the consolidated city-county was 9,421, and the US Census Bureaus's 2015-2019 American Community Survey showed a median household income of $41,820. Anaconda had earlier peaks of population in 1930 and 1980, based on the mining industry. As a consolidated city-county area, it ranks as the ninth most populous city in Montana, but as only a city is far smaller. Central Anaconda is 5,335 ft (1,626 m) above sea level, and is surrounded by the communities of Opportunity and West Valley.
Vedanta Limited is an Indian multinational mining company headquartered in Mumbai, with its main operations in iron ore, gold and aluminium mines in Goa, Karnataka, Rajasthan and Odisha.
The Eretz Israel Museum is a historical and archeological museum in the Ramat Aviv neighborhood of Tel Aviv, Israel.
Boliden AB is a Swedish multinational metals, mining, and smelting company headquartered in Stockholm. The company produces zinc, copper, lead, nickel, silver, and gold, with operations in Sweden, Finland, Norway, and Ireland.
Kazakhmys Group is a vertically integrated holding company whose key assets are concentrated in the mining industry and non-ferrous metallurgy. It was established and registered in the form of a joint-stock company in August 1997. On 14 January 2005, the company was re-registered from a joint-stock company into a limited liability partnership.
KGHM Polska Miedź S.A., commonly known as KGHM, is a Polish multinational mining corporation headquartered in Lubin, Lower Silesia, Poland. Founded in 1961 as a state enterprise, the company is considered a major global producer of copper and silver. Since 1997, it has been listed on the Warsaw Stock Exchange (WSE). The company is also a component of the WIG30 stock market index.
Mount Isa Mines Limited ("MIM") operates the Mount Isa copper, lead, zinc and silver mines near Mount Isa, Queensland, Australia as part of the Glencore group of companies. For a brief period in 1980, MIM was Australia's largest company. It has pioneered several significant mining industry innovations, including the Isa Process copper refining technology, the Isasmelt smelting technology, and the IsaMill fine grinding technology, and it also commercialized the Jameson Cell column flotation technology.
The Calumet and Hecla Mining Company was a major copper-mining company based within Michigan's Copper Country. In the 19th century, the company paid out more than $72 million in shareholder dividends, more than any other mining company in the United States during that period.
The mining industry of Botswana has dominated the national economy of Botswana since the 1970s. Diamond has been the leading component of the mineral sector since large-scale diamond production began in 1972 by Debswana. Most of Botswana's diamond production is of gem quality, resulting in the country's position as the world's leading producer of diamond by value. Copper, gold, nickel, coal and soda ash production also has held significant, though smaller, roles in the economy.
Tongling Nonferrous Metals Group Holding Company Limited is a state-owned enterprise involving in extracting copper resources and smelting copper and other non-ferrous metals. It was founded in 1949 in Tongling, Anhui, China and it was put into production in 1952. It is one of the largest copper smelting companies in the country.
Hindustan Copper Ltd. is a central public sector undertaking under the ownership of the Ministry of Mines, Government of India. HCL is the only vertically integrated government-owned-copper producer in India engaged in a wide spectrum of activities ranging from mining, beneficiation, smelting, refining and continuous cast rod manufacturer.
Plants for the production of lead are generally referred to as lead smelters. Primary lead production begins with sintering. Concentrated lead ore is fed into a sintering machine with iron, silica, limestone fluxes, coke, soda ash, pyrite, zinc, caustics or pollution control particulates. Smelting uses suitable reducing substances that will combine with those oxidizing elements to free the metal. Reduction is the final, high-temperature step in smelting. It is here that the oxide becomes the elemental metal. A reducing environment pulls the final oxygen atoms from the raw metal.
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