Why Is Antofagasta Plc Down Today?

Antofagasta Plc shares fell 2.98% to around 3,156.0p today, a decline of 97.00p, according to the supplied market data.

Antofagasta was among the weakest Mining stocks in London as copper prices softened and a global Equity sell-off reduced appetite for cyclical shares.

As a pure-play copper producer, Antofagasta is particularly sensitive to movements in the copper price.

Today’s decline therefore reflects Commodity and market conditions rather than a new company announcement.

About Antofagasta Plc

Antofagasta Plc is one of the world’s leading copper producers, with operations in Chile.

Its main mining operations are Los Pelambres, Centinela, Antucoya and Zaldívar. The group also has a transport division that provides rail and road services in northern Chile.

Antofagasta (LSE:ANTO) is controlled by the Luksic family and is a member of the FTSE 100, with a Market Capitalisation of about £32 billion.

Antofagasta also produces gold and molybdenum as by-products, which help reduce its net cash costs.

Key Reasons Behind Today’s Downtick

Today’s 2.98% decline was driven by weakness across the mining sector.

Copper prices softened, and Antofagasta, Anglo American and Rio Tinto all retreated.

Global markets were also hit by weakness in US chipmakers and uncertainty ahead of the US midterm elections.

Copper miners have been seen as beneficiaries of AI-driven Demand for power infrastructure. When investors question the strength of the AI Investment cycle, copper miners can come under pressure.

Investors are also still digesting the group’s Q3 production report, which included higher cost guidance.

Q3 2026 Production Performance

Antofagasta delivered higher quarterly production in Q3 2026.

Copper production rose 7% quarter-on-quarter to 151,900 tonnes, reflecting higher output at Los Pelambres.

Los Pelambres completed the drawdown of inventories accumulated during the prior quarter and showed resilience after a severe weather event in July.

However, year-to-date copper production of 436,900 tonnes was around 8% lower than the same period in 2025, mainly due to lower grades at Centinela Concentrates and lower recoveries at Centinela Cathodes.

2026 Guidance and Rising Costs

Antofagasta kept its 2026 production guidance unchanged at 625,000 to 655,000 tonnes of copper.

However, the group raised its guidance for cash costs before by-product credits to $2.60 to $2.70 per pound, from $2.40 to $2.60 per pound previously.

The increase reflects global diesel prices remaining at elevated levels.

Higher production in the second half can help spread fixed costs, but the higher full-year guidance points to continued pressure on margins.

2027 Production Guidance

Antofagasta issued 2027 production guidance of 630,000 to 690,000 tonnes of copper.

The guidance reflects higher grades at Los Pelambres, partly offset by lower grades at Centinela Concentrates.

The upper end of the range would represent meaningful growth compared with 2026.

Major Growth Projects

Antofagasta has several major growth projects nearing completion.

At Centinela, pre-commissioning of the Second Concentrator is progressing.

At Los Pelambres, work continues on the concentrate pipeline and the expansion of the desalination plant.

These projects are expected to complete construction and commissioning by 2027, supporting future production growth.

Desalination is particularly important because water Scarcity is a major operational constraint for mining in Chile.

Why Copper Matters

Copper is essential for electrification, renewable energy, electric vehicles and data centres.

Supply growth has been constrained by declining ore grades and limited new projects, which supports the long-term outlook for prices.

As a focused copper producer, Antofagasta offers direct exposure to this theme.

However, this also means its shares can be volatile when copper prices move sharply.

Key Growth Catalysts

The biggest catalyst for Antofagasta (LSE:ANTO) is completion of the Centinela Second Concentrator and Los Pelambres expansion projects.

Higher grades at Los Pelambres should support production growth in 2027.

A rise in copper prices would significantly increase Earnings and cash flow.

Lower diesel and energy costs could ease cost pressure.

Gold and molybdenum by-product credits can also help reduce net costs.

Chile Exposure

Antofagasta’s operations are concentrated in Chile.

This creates exposure to Chilean mining regulation, royalties, taxes, water rights and labour relations.

Weather events, such as the severe front that affected Los Pelambres in July, can disrupt operations.

Labour negotiations at Centinela have also been identified as a risk.

Risks

Copper price Volatility is the most important risk for Antofagasta.

Cost inflation, particularly for diesel, energy and other consumables, could pressure margins.

Lower ore grades and recoveries could reduce production.

Project delays or cost overruns at Centinela or Los Pelambres could affect growth plans.

Labour disputes, weather events and regulatory changes in Chile could also affect operations.

Conclusion

Antofagasta’s 2.98% decline to 3,156.0p reflects softer copper prices and a global equity sell-off.

Q3 copper production rose 7% to 151,900 tonnes, and 2026 production guidance of 625,000 to 655,000 tonnes was maintained.

However, cash cost guidance was raised to $2.60 to $2.70 per pound.

The group issued 2027 guidance of 630,000 to 690,000 tonnes, supported by major growth projects due for completion by 2027.

The key factors to monitor are copper prices, production, costs, project delivery and developments in Chile.