Antofagasta (LSE: ANTO) closes at 3,789.50p as Chinese Demand jitters and Chile regulatory noise weigh on FTSE 100 copper.

Antofagasta share price slipped 0.55% on 18 May 2026, closing at 3,789.50p as China growth concerns and noise from the Chilean regulatory backdrop took the shine off the FTSE 100 copper pure-play. The 21p decline is modest and consistent with broader weakness across UK miners, but it underscores how sensitive ANTO remains to swings in Chinese industrial sentiment.

Antofagasta is one of the world's largest copper miners and the most direct play on copper within the FTSE 100. With electrification, EVs, grid Investment and AI-related power demand structurally supporting copper, the long-term thesis remains intact — but short-term moves are dominated by the China cycle.

Key Takeaways

  • Antofagasta (LON: ANTO) closed at 3,789.50p on 18 May 2026, down 0.55%.
  • Weak Chinese data dragged the FTSE 100 Mining complex; Antofagasta moved in sympathy.
  • Chile's regulatory environment for copper remains a watch item across the sector.
  • Half-year and quarterly production metrics in 2025 supported revenues despite mixed metals prices.
  • Investors are watching copper price, Chilean output and capex guidance.

Why the Share Price Is Moving

The dominant driver is China. Industrial activity, real-estate construction and infrastructure spending in China remain the single largest demand input for copper, and any negative datapoint flows quickly into FTSE 100 mining shares.

There is no Antofagasta-specific news item on 18 May. The 0.55% drop is mainly sector Beta and broader risk-off sentiment in the mining complex, alongside profit-taking after a strong year for copper-leveraged equities.

Chile-specific regulatory noise — including recent rulings affecting peer copper operations — has not directly hit Antofagasta but contributes to a more cautious tone for Chile-focused producers.

Latest Company News

Antofagasta delivered solid half-year and quarterly production metrics in 2025, with volumes and realised prices supporting robust revenues despite a mixed metals price environment.

Capex priorities continue around the Centinela second concentrator and Los Pelambres expansion — long-cycle growth projects underpinning copper output through the decade.

Industry M&A speculation, including reported Rio Tinto–Glencore Merger talks, has supported sector valuations and re-focused attention on Antofagasta's strategic copper asset base.

Water and energy management at Chilean operations continues to be a focus, with desalination investment a key element of long-term operational resilience.

What Investors Are Watching Next

Copper price direction — particularly LME stocks and Chinese smelter TC/RC spreads.

Chilean production updates and any further regulatory developments.

Centinela second concentrator and Los Pelambres expansion progress.

Capital allocation, Dividend policy and net Debt trajectory.

Wider FTSE 100 mining M&A and read-across to ANTO.

FTSE 100 Market Outlook

The FTSE 100 closed 18 May 2026 around 10,208, broadly flat. Mining was the day's weak sector on Chinese growth concerns.

Copper's structural demand profile remains supportive: electrification, EVs, grid investment and AI-related power demand will continue to underpin long-term consumption.

Antofagasta is uniquely positioned within the FTSE 100 as a near-pure copper play. Its share price will continue to mirror the LME copper curve, Chinese activity data and Chile risk premia.