Superior is a town in Pinal County, Arizona, United States. Superior, which is in northern Pinal County, is the oldest town in that county. According to the 2020 census, the population of the town was 2,407. Superior was founded as a mining town for the Silver King and the later Magma mines; silver was mined at first, and then transitioned to copper. Currently, exploitation of the huge Resolution Copper deposit is being explored.
Freeport-McMoRan Inc., often called Freeport, is an American mining company based in the Freeport-McMoRan Center, in Phoenix, Arizona. The company is the world's largest producer of molybdenum, a major copper producer and operates the world's largest gold mine, the Grasberg mine in Papua, Indonesia.
The Tonto National Forest, encompassing 2,873,200 acres, is the largest of the six national forests in Arizona and is the ninth largest national forest in the United States. The forest has diverse scenery, with elevations ranging from 1,400 feet in the Sonoran Desert to 7,400 feet in the ponderosa pine forests of the Mogollon Rim. The Tonto National Forest is also one of the most visited "urban" forests in the United States.
Rio Tinto Group is a British-Australian multinational company that is the world's second largest metals and mining corporation. It was founded in 1873 when a group of investors purchased a mine complex on the Rio Tinto, in Huelva, Spain, from the Spanish government. It has grown through a long series of mergers and acquisitions. Although primarily focused on extraction of minerals, it also has significant operations in refining, particularly the refining of bauxite and iron ore. It has joint head offices in London, England and Melbourne, Australia.
Kennecott Utah Copper LLC (KUC), a division of Rio Tinto Group, is a mining, smelting, and refining company. Its corporate headquarters are located in South Jordan, Utah. Kennecott operates the Bingham Canyon Mine, one of the largest open-pit copper mines in the world in Bingham Canyon, Salt Lake County, Utah. The company was first formed in 1898 as the Boston Consolidated Mining Company. The current corporation was formed in 1989. The mine and associated smelter produce 1% of the world's copper.
Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name. In later stages, circulating meteoric fluids may interact with the magmatic fluids. Successive envelopes of hydrothermal alteration typically enclose a core of disseminated ore minerals in often stockwork-forming hairline fractures and veins. Because of their large volume, porphyry orebodies can be economic from copper concentrations as low as 0.15% copper and can have economic amounts of by-products such as molybdenum, silver, and gold. In some mines, those metals are the main product.
The San Carlos Apache Indian Reservation, in southeastern Arizona, United States, was established in 1872 as a reservation for the Chiricahua Apache tribe as well as surrounding Yavapai and Apache bands removed from their original homelands under a strategy devised by General George Crook of setting the various Apache tribes against one another. Once nicknamed "Hell's Forty Acres" during the late 19th century due to poor health and environmental conditions, modern San Carlos Apaches operate a Chamber of Commerce, the Apache Gold and Apache Sky Casinos, a Language Preservation program, a Culture Center, and a Tribal College.
The Bingham Canyon Mine, more commonly known as Kennecott Copper Mine among locals, is an open-pit mining operation extracting a large porphyry copper deposit southwest of Salt Lake City, Utah, in the Oquirrh Mountains. The mine is the largest human-made excavation, and deepest open-pit mine in the world, which is considered to have produced more copper than any other mine in history – more than 19,000,000 short tons. The mine is owned by Rio Tinto Group, a British-Australian multinational corporation. The copper operations at Bingham Canyon Mine are managed through Kennecott Utah Copper Corporation which operates the mine, a concentrator plant, a smelter, and a refinery. The mine has been in production since 1906, and has resulted in the creation of a pit over 0.75 miles (1,210 m) deep, 2.5 miles (4 km) wide, and covering 1,900 acres. It was designated a National Historic Landmark in 1966 under the name Bingham Canyon Open Pit Copper Mine. The mine experienced a massive landslide in April 2013 and a smaller slide in September 2013.
Aluminum Corporation of China Limited, is a multinational aluminium company headquartered in Beijing, People's Republic of China. It is a public company, listed in Hong Kong and in New York. In 2021, it was the world's largest aluminum producer, ahead of China Hongqiao Group, Rusal and Shandong Xinfa.
Pebble Mine is the common name of a proposed copper-gold-molybdenum mining project in the Bristol Bay region of Southwest Alaska, near Lake Iliamna and Lake Clark. It was discovered in 1987, optioned by Northern Dynasty Minerals in 2001, explored in 2002, and drilled from 2002-2013 with discovery in 2005. Preparing for the permitting process began and administrative review lasted over 13 years.
In the United States, copper mining has been a major industry since the rise of the northern Michigan copper district in the 1840s. In 2017, the US produced 1.27 million metric tonnes of copper, worth $8 billion, making it the world's fourth largest copper producer, after Chile, China, and Peru. Copper was produced from 23 mines in the US. Top copper producing states in 2014 were Arizona, Utah, New Mexico, Nevada, and Montana. Minor production also came from Idaho and Missouri. As of 2014, the US had 45 million tonnes of known remaining reserves of copper, the fifth largest known copper reserves in the world, after Chile, Australia, Peru, and Mexico.
In Arizona, copper mining has been a major industry since the 19th century. In 2007, Arizona was the leading copper-producing state in the country, producing 750 thousand metric tons of copper, valued at $5.54 billion. Arizona's copper production was 60% of the total for the United States. Copper mining also produces gold and silver as byproducts. Byproduct molybdenum from copper mining makes Arizona the nation's second-largest producer of that metal. Although copper mineralization was found by the earliest Spanish explorers of Arizona, the territory was remote, and copper could seldom be profitably mined and shipped. Early Spanish, Mexican, and American prospectors searched for gold and silver, and ignored copper. It was not until the completion of the Southern Pacific Railroad in 1876 that copper became broadly economic to mine and ship to market.
The Oyu Tolgoi mine, also Oyuutolgoi, is a combined open pit and underground mining project in Khanbogd sum within the south Gobi Desert, approximately 235 kilometres (146 mi) east of the Ömnögovi Province capital Dalanzadgad. The site was discovered in 2001 and is being developed as a joint venture between Turquoise Hill Resources with 66% ownership and the Government of Mongolia with 34%. The mine began construction as of 2010 and shipped its first batch of copper on 9 July 2013.
Lundin Mining Corporation is a Canadian company that owns and operates mines in Sweden, United States, Chile, Portugal and Brazil that produce base metals such as copper, zinc, and nickel. Headquartered in Toronto, the company was founded by Adolf Lundin and operated by Lukas Lundin. While it was incorporated to pursue an interest in a diamond mine in Brazil, the company re-structured and raised funds to develop the Storliden mine in Sweden. It purchased the Swedish Zinkgruvan Mine from Rio Tinto and then merged with Arcon International Resources for its Galmoy Mine in Ireland and with Eurozinc for its Neves-Corvo mine in Portugal. The company subsequently purchased and operated the Eagle mine, Candelaria mine, and Chapada mine.
Turquoise Hill Resources was a Canadian mineral exploration and development company headquartered in Montreal, Quebec, and since December 2022, a wholly owned subsidiary of Rio Tinto Group. The company was called Ivanhoe Mines until August 2, 2012 when a financing agreement was completed with Rio Tinto. Rio Tinto acquired full ownership of Turquoise Hill in December 2022.
The Southeast Arizona Land Exchange and Conservation Act of 2013 is a bill that was introduced into the United States House of Representatives during the 113th United States Congress. H.R. 687 would authorize a land exchange in Arizona between the federal government and a mining company. Under H.R. 687, the United States Forest Service would convey about 2,400 acres of land in southeast Arizona to Resolution Copper Mining LLC in exchange for about 5,400 acres of company-owned land. Of the company land, about 1,200 acres would become part of the National Forest System, and about 4,200 acres would be administered as conservation areas by the Bureau of Land Management. If the property sought by Resolution Copper is appraised at more than the appraised value of the property that the company offers for exchange, the company could donate additional land or make a cash payment to the United States to make the final exchange of equal value. If the company’s property is appraised for more than the federal acreage, the difference in the value would be considered a donation to the federal government. According to the Committee Report on the bill, the "mine could provide up to one-quarter of the nation's estimated annual copper needs" and the mining company estimates that the "total economic impact of the mine will exceed $60 billion and support 3,700 jobs annually." Opponents of the bill argue that the swap has not been thoroughly studied, that the mining company has failed to indicate where it will get much needed water for the mine, and that Native American tribes have not been properly consulted.
The Carl Levin and Howard P. "Buck" McKeon National Defense Authorization Act for Fiscal Year 2015 was a National Defense Authorization Act. According to the House Armed Services Committee, which oversaw the legislation, the bill would be "the comprehensive legislation to authorize the budget authority of the Department of Defense and the national security programs of the Department of Energy." The total appropriations that are authorized amount to approximately $600 billion for fiscal year 2015.
Molybdenum mining in the United States produced 65,500 metric tons of molybdenum in 2014, worth US$1.8 billion. The US was the world's second-largest molybdenum producer, after China, and provided 25% of the world's supply of molybdenum.
Oak Flat is in Pinal County about 40 miles (64 km) east of Phoenix in the Tonto National Forest, a high desert setting at 3,900 feet (1,200 m) elevation. The land is sacred to Native Americans from the San Carlos Apache Indian Reservation and many other Arizona tribes. This federally-protected area is listed on the National Register of Historic Places, and features a National Forest Service public campground. The landscape includes Apache Leap cliff, the mesa of Oak Flat, and Devil's Canyon, all of which have long been popular with hikers, birders, climbers, off-roaders, hunters, and members of the area's indigenous tribes. Oak Flat has been subject to attempts by the federal government to sell it to mining interests since 2002, against the wishes of the San Carlos Apache tribe.
