Antofagasta plc
A London-listed Chilean mining group whose principal business is copper production in Chile.
Last updated August 31, 2026
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Overview
Antofagasta plc is a London-based Chilean multinational mining group and one of the principal copper producers listed on the London Stock Exchange. Its operating centre is Chile, where the group, through Antofagasta Minerals, owns or participates in major copper mines and related infrastructure. Copper is the company’s dominant product, with gold and molybdenum recovered as associated products at certain operations. The group’s principal Chilean assets include Los Pelambres, Centinela, Antucoya and Zaldívar. It also has a history of railway ownership, international mineral exploration, development partnerships and investment in projects outside Chile. The company originated as Ferrocarril de Antofagasta a Bolivia, a railway business incorporated and listed in London in 1888 to operate a route between the Pacific port of Antofagasta and La Paz, Bolivia. Its modern identity developed after the Luksic family acquired control in 1980 and integrated the railway and other interests under Antofagasta Holdings. During the 1980s the group diversified into mining, investing in Michilla and Los Pelambres, as well as telecommunications and other activities. In 1996, its banking and industrial interests were transferred to Quiñenco, another Luksic-controlled company, allowing Antofagasta Holdings to concentrate on mining. The shorter name Antofagasta was adopted in 1999. Los Pelambres became the strategic foundation of the group’s copper portfolio. Centinela brought together operations formerly associated with the Esperanza and Tesoro mines, while Antucoya added a further Chilean oxide-copper operation. Antofagasta acquired full ownership of Zaldívar in 2015 after purchasing Barrick Gold’s half interest. The company has also pursued international opportunities, including the Twin Metals copper-nickel project in Minnesota, exploration in British Columbia and a former joint venture in Pakistan’s Reko Diq project. Antofagasta’s performance is closely linked to copper prices, production volumes, ore grades, recoveries, energy and water costs, capital expenditure, permitting and the availability of transport and processing infrastructure. Its mining activities also require continuing engagement with Chilean communities, regulators and other stakeholders. The group remains positioned as a copper-focused international mining company with its principal assets and operational expertise concentrated in the Americas.
History
Antofagasta plc traces its origins to Ferrocarril de Antofagasta a Bolivia, a railway company incorporated and listed on the London Stock Exchange in 1888. The railway was established to connect Antofagasta, a Pacific port in northern Chile, with La Paz, the capital of Bolivia. Although the railway remained an important part of the group’s historical identity, the company later evolved into a diversified Chilean-controlled enterprise and ultimately became principally associated with mining. A decisive change occurred in 1980, when the Luksic family acquired control of the railway business. The railway and other activities were subsequently integrated under the name Antofagasta Holdings. During the 1980s, under managing director Philip Adeane, the group expanded beyond transport. It invested in the Michilla mining operation in 1983 and in the Los Pelambres copper project in 1986. The group also entered telecommunications and other areas, reflecting a broader diversification strategy. In 1996, Antofagasta Holdings transferred its banking activities and industrial interests to Quiñenco, another company controlled by the Luksic family. This restructuring allowed Antofagasta Holdings to focus more directly on the development of Los Pelambres and the Tesoro mines and to establish a clearer identity as a copper producer. The abbreviated name Antofagasta was adopted in 1999. Los Pelambres, one of the world’s significant copper deposits, became the central asset around which the group’s modern mining business developed. Centinela later became another major operating centre, bringing together operations previously associated with the Esperanza and Tesoro mines. Antucoya expanded the company’s Chilean copper portfolio, while the acquisition of Barrick Gold’s 50% interest made Antofagasta the sole owner of Zaldívar in 2015. The group also pursued activities outside its core Chilean portfolio. In 2009 it agreed with Carbon Energy to develop an underground coal-gasification project at Mulpún in southern Chile; the project was placed on hold in 2013. In 2015 Antofagasta took control of Twin Metals, a company connected with a proposed copper and nickel project in northern Minnesota. The project became involved in a lengthy United States permitting process and attracted substantial environmental opposition because of its proximity to a wilderness region containing numerous lakes and rivers. Antofagasta also entered an exploration agreement for the Ball Creek property in British Columbia in 2016. The group’s international portfolio included participation in the Reko Diq copper-gold project in Pakistan with Barrick Gold. Antofagasta Minerals withdrew from that project in 2022 in the context of the Reko Diq dispute and associated settlement arrangements. Following the withdrawal, the company stated that it intended to concentrate its operations in the Americas. Today, Antofagasta is principally a copper mining group with four major Chilean copper operations: Los Pelambres, Centinela, Antucoya and Zaldívar. Its output may include gold and molybdenum as associated products. The company remains listed in London and is a constituent of the FTSE 100 Index, while its principal production, resources and mining workforce are located in Chile.
- 2022
Withdrawal from Reko Diq
[1]Antofagasta Minerals exited the Reko Diq project in Pakistan and reiterated a strategic focus on the Americas.
- 2016
Michilla sold
[1]The group sold the idled Michilla mine and related properties while retaining selected infrastructure.
- 2015
Zaldívar becomes wholly owned
[1]Antofagasta acquired Barrick Gold’s 50% interest in Zaldívar and became its sole owner.
- 2015
Twin Metals control acquired
[1]Antofagasta took control of Twin Metals and its proposed copper-nickel project in Minnesota.
- 2013
Mulpún project put on hold
[1]The Mulpún underground coal-gasification project was suspended.
- 2009
Mulpún coal-gasification agreement
[1]Antofagasta agreed with Carbon Energy to develop an underground coal-gasification project in southern Chile.
- 1999
Shortened Antofagasta name adopted
[1]The group adopted the shorter Antofagasta name as its corporate identity.
- 1996
Mining focus strengthened
[1]Banking and industrial interests were transferred to Quiñenco, allowing Antofagasta Holdings to concentrate on mining development.
- 1986
Investment in Los Pelambres
[1]The group invested in Los Pelambres, which later became one of the foundations of its copper business.
- 1983
Investment in Michilla mining
[1]Antofagasta Holdings invested in the Michilla mining operation as part of its diversification into mining.
Products and positioning
A copper-focused international mining group with Chilean operating assets and access to London’s public capital markets.
Metal and mining output
Copper
Copper is Antofagasta’s principal product and the economic foundation of its mining portfolio. It is produced from large-scale Chilean operations including Los Pelambres, Centinela, Antucoya and Zaldívar. Copper sales expose the group to international metal prices, production levels, ore grades, recovery rates, operating costs, energy and water availability, and the capital required to sustain or expand mine capacity.
Copper mine
Los Pelambres
Los Pelambres is one of Antofagasta’s principal Chilean copper operations and a strategic asset in the group’s modern history. The deposit was identified in the early twentieth century and became central to Antofagasta’s mining expansion after the group invested in the project during the 1980s. The operation is associated primarily with copper production and also with gold and molybdenum output.
Copper mining complex
Centinela
Centinela is a major Antofagasta mining complex in Chile. It incorporates the operating history of the Esperanza and Tesoro mines and contributes copper production alongside associated minerals. Centinela is part of the group’s core Chilean asset base and relies on extensive mining, processing, transport, water and supporting infrastructure.
Copper mine
Antucoya
Antucoya is a Chilean copper operation within Antofagasta Minerals’ portfolio. It is an oxide-copper asset and forms part of the company’s northern Chilean operating platform, sharing strategic links with regional processing and infrastructure activities.
Copper mine · 2015
Zaldívar
Zaldívar is a Chilean copper mine that became wholly owned by Antofagasta in 2015 after the company acquired Barrick Gold’s 50% interest. It is one of the four principal copper operations identified with Antofagasta’s current Chilean portfolio.
Associated mineral output
Gold
Gold is produced as an associated mineral at parts of Antofagasta’s copper portfolio, notably in connection with deposits such as Los Pelambres and Centinela. It is secondary to copper in the group’s strategic positioning but contributes to the overall value recovered from mined ore.
Associated mineral output
Molybdenum
Molybdenum is an associated product of selected copper operations, including Los Pelambres. Its presence reflects the polymetallic characteristics of some of Antofagasta’s Chilean ore bodies and provides an additional revenue stream alongside copper and gold.
Controversies
2018
Twin Metals environmental and permitting controversy
Antofagasta’s Twin Metals project in Minnesota faced environmental opposition and a prolonged permitting process because of its location near a wilderness area containing numerous lakes and rivers. The project also attracted political and media scrutiny concerning the relationship between the Luksic family and prominent United States political figures.
Brand decisions
2022
Withdraw from Reko Diq and emphasize the AmericasStrategyBackground
Antofagasta Minerals participated in the Reko Diq project in Pakistan with Barrick Gold amid a major legal and political dispute.
Action taken
Antofagasta Minerals withdrew from the project and stated that it intended to focus its operations in the Americas.
Aftermath
The withdrawal reduced the group’s exposure to Pakistan and reinforced its geographic concentration in Chile and the wider Americas.
2015
Purchase the remaining interest in ZaldívarM&ABackground
Zaldívar was jointly owned by Antofagasta and Barrick Gold.
Action taken
Antofagasta bought Barrick Gold’s 50% interest and made Zaldívar a wholly owned operation.
Aftermath
The transaction increased Antofagasta’s direct control over a significant Chilean copper asset.
1996
Concentrate the group on miningStrategyBackground
Antofagasta Holdings operated a diversified portfolio that included banking and industrial interests as well as mining.
Action taken
The banking and industrial businesses were transferred to Quiñenco, leaving Antofagasta Holdings more focused on Los Pelambres, Tesoro and copper production.
Aftermath
The restructuring sharpened the group’s identity as a mining company and supported its later development as a copper producer.
1980
Acquire control of the railway groupM&ABackground
The Luksic family sought control of the company that operated the Antofagasta-to-Bolivia railway and related interests.
Action taken
The family acquired a controlling stake and subsequently integrated the businesses under Antofagasta Holdings.
Aftermath
The transaction established the ownership structure and strategic platform from which the modern mining group developed.
Recent events
Antofagasta cuts 2021 copper production guidance[3]
Reported:
Antofagasta revised its copper production guidance for 2021 to 710,000–740,000 tonnes from 730,000–760,000 tonnes, citing anticipated low rainfall in Chile.
Sources3 sources
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