Antofagasta (ANTO) Shares: Copper, Molybdenum and Chilean Mines

Antofagasta plc (ANTO) is one of the few FTSE 100 constituents whose fortunes rest almost entirely on a single metal. The company mines copper in Chile, sells it as concentrate and cathode, and collects molybdenum, gold and silver as by-products along the way. That narrow focus makes any Antofagasta stock analysis unusually dependent on two variables: how many tonnes come out of the ground, and what price the market pays for them. The first half of 2026 happened to pull those two levers in opposite directions, which makes it a useful period for understanding how the business actually behaves. This article walks through what the company owns, what it reported for the six months to 30 June 2026, how its costs are constructed, and where the pressure points sit.

Four Copper Mines, One Railway and a Controlling Family

Antofagasta operates through four producing mines, all in Chile, plus a transport arm and an exploration unit. Los Pelambres, in the Coquimbo Region to the north of Santiago, is the flagship and the largest contributor. Centinela, Antucoya and Zaldivar sit further north in the Antofagasta Region, in the dry country of the Atacama. The group reports these as separate operating segments, alongside a Transport Division that runs rail and road freight in northern Chile, and an Exploration and Evaluation segment.

The product mix matters more than it first appears. Centinela and Los Pelambres produce copper concentrates, which are shipped to smelters; Antucoya and parts of Centinela produce copper cathodes through leaching, which are a finished product. Los Pelambres and Centinela also yield molybdenum, and Centinela produces meaningful gold. Those by-products are not a rounding error. They are credited against the cost of producing copper, which is why the company's headline cost measure can move sharply even when mining costs themselves are flat.

One structural feature that distinguishes Antofagasta from most of its FTSE 100 peers is ownership. The Luksic family holds a controlling stake of roughly 60 per cent of the shares, and Jean-Paul Luksic chairs the board. For minority shareholders this cuts both ways. A long-term controlling owner tends to support patient capital spending and discourages the kind of acquisition sprees that have damaged value elsewhere in mining. It also means the free float is smaller than the market capitalisation suggests, and that minority holders have limited influence over strategy.

What the First Half of 2026 Showed

Antofagasta reports in US dollars, not sterling, which is worth holding in mind throughout. The company publishes half-year and full-year results rather than quarterly accounts, with separate quarterly production reports. The half-year results for the six months ended 30 June 2026 were released on 13 August 2026.

Revenue rose 18 per cent to approximately $4.5 billion. EBITDA climbed 27 per cent to $2.84 billion, and the EBITDA margin widened by five percentage points to 63.4 per cent, which the company described as a record. Profit before tax jumped 72 per cent to around $2.0 billion, and underlying earnings came in at $0.859 per share. Operating cash flow rose 53 per cent to $2.8 billion, helped by lower working capital as well as higher revenue.

Those numbers look uniformly strong, but the driver was price, not volume. Copper production for the half was 285,000 tonnes, down 9 per cent year on year, with lower output at both Los Pelambres and Centinela. The realised copper price was $6.19 per pound, up 36 per cent on the same period a year earlier. By-product realisations also strengthened sharply, with molybdenum up 55 per cent and gold up 46 per cent. In other words, the company sold less copper and made considerably more money doing it.

The production shortfall carried into guidance. Antofagasta reduced its full-year 2026 copper production forecast to 625,000 to 655,000 tonnes, down from the previous 650,000 to 700,000 tonnes, a cut of roughly 5 per cent at the midpoint. The trigger was weather: heavy rain and snowfall in July forced Los Pelambres to suspend operations after the Chilean government declared a state of catastrophe in the Coquimbo Region. For context, the group produced 664,000 tonnes of copper in 2025, so the revised range implies a year of flat-to-lower output.

Antofagasta Stock Analysis: Net Cash Costs and By-Product Credits

The cost measure the market watches most closely for Antofagasta is the net cash cost per pound of copper. It takes the cash cost of mining and processing, then subtracts the revenue earned from molybdenum, gold and silver. Because of that subtraction, the figure is a blended statement about mining efficiency and by-product prices at the same time, and it is easy to misread one as the other.

In the first half of 2026, net cash costs fell 8 per cent year on year to $1.22 per pound. The company attributed this to stronger by-product credits and cost discipline, and pointed to its competitiveness programme, which delivered $67 million of savings and productivity gains in the half and contributed around $0.10 per pound of the improvement. Full-year net cash cost guidance was maintained at $1.15 to $1.35 per pound, with management indicating that better second-half production, by-product revenue and the competitiveness programme should support delivery.

It is worth separating the two effects. Roughly $0.10 per pound of the improvement came from the internal efficiency programme, which is durable and within the company's control. The rest leaned on by-product prices, which are not. Had molybdenum and gold been flat rather than up 55 and 46 per cent respectively, the cost line would have looked materially less impressive, particularly against a backdrop of lower copper volumes spreading fixed costs over fewer tonnes. Investors analysing the cost trend over time generally find it more informative to look at gross cash costs alongside the net figure.

Capital Spending, Net Debt and the Dividend

Antofagasta is in the late stages of an unusually heavy investment cycle. Capital expenditure peaked at $3.7 billion in 2025 and is expected to be around $3.4 billion in 2026, with residual project spending running into 2027. In the first half of 2026 alone, $1,671 million was deployed, primarily on the Centinela Second Concentrator and growth-enabling projects at Los Pelambres.

The Centinela Second Concentrator is the single largest item. Construction and pre-commissioning work were reported as on schedule and on budget, with commissioning expected to complete in 2027. At Zaldivar, the company received environmental impact assessment approval in 2025 to extend the life of the mine, which addresses one of the group's nearer-term reserve questions.

That spending has been funded partly from debt. Net debt stood at $3,966.1 million at the end of June 2026, with a net debt to EBITDA ratio of 0.68 times. The company noted that the increase reflected strong cash flows set against capital expenditure, dividend payments and the recognition of Centinela's new water infrastructure as a lease. A ratio below one times EBITDA is low by mining-sector standards, though it is worth remembering that the denominator is currently being flattered by record copper prices, so the same debt balance would produce a higher ratio in a weaker price environment.

The dividend is set by a formula rather than by discretion, which makes it more predictable than most mining payouts. The policy commits to a minimum of 35 per cent of underlying earnings per share, after sustaining capital and mine development are funded, with scope to pay more. The interim dividend for the first half of 2026 was 30.1 cents per share, equal to $296.7 million, representing the 35 per cent minimum and an 81 per cent increase on the prior-year interim of 16.6 cents. For the 2025 financial year, the company paid 16.6 cents interim plus a 48.0 cents final dividend, a total of 64.6 cents or $636.9 million, equivalent to a 50 per cent payout ratio. The pattern to note is that the interim is typically struck at the floor, with any top-up coming at the final.

Where the Risks Sit

The risks attached to Antofagasta shares are reasonably easy to enumerate, which is one of the advantages of a focused business.

• Copper price exposure. With margins at 63.4 per cent on a realised price of $6.19 per pound, the operational gearing works powerfully in both directions. A sustained fall in the copper price would compress earnings, the dividend and the net debt ratio simultaneously.
• Single-country concentration. Every producing asset is in Chile. Tax policy, water rights, permitting and community relations in one jurisdiction therefore carry outsized weight.
• Weather and water. The July 2026 shutdown at Los Pelambres is a direct illustration. Operations in the Andes and the Atacama are exposed both to extreme precipitation events and to long-running water scarcity, which is why desalination and water infrastructure form part of the capital programme.
• Execution on the growth pipeline. The Centinela Second Concentrator is large relative to the group. Commissioning timetables and ramp-up curves for concentrators frequently slip, and the spending is already committed.
• Grade decline. Falling ore grades are an industry-wide reality. Maintaining output often requires moving more rock for the same metal, which pushes up unit costs over time.

Antofagasta sits in a peer group that includes the diversified majors such as Rio Tinto (RIO), Anglo American (AAL) and Glencore (GLEN), as well as the more copper-weighted Freeport-McMoRan (FCX). The comparison that matters is exposure rather than size: the diversified groups can offset a weak copper year with iron ore, coal or trading income, whereas Antofagasta cannot.

What to Watch From Here

On 8 September 2026 the shares traded at around 4,081p, or £40.81, having closed the prior session at 4,039p for a market capitalisation of roughly £39.8 billion. At that level the trailing price-to-earnings ratio was approximately 27 times reported earnings of the preceding twelve months. A trailing multiple measures what the market pays today for earnings already delivered, and for a cyclical producer those earnings reflect the copper price that prevailed over the period in question rather than any long-run average. There is also a mechanical wrinkle worth noting: the share price is quoted in pence while the accounts are kept in US dollars, so sterling strength or weakness moves the reported multiple without anything changing inside the business.

For anyone following the Antofagasta share price from here, several specific items will determine whether the current picture holds. The second-half production recovery is the first: the revised 625,000 to 655,000 tonne guidance requires a meaningful step up from the 285,000 tonnes delivered in the first half, and the quarterly production reports are where that becomes visible. The second is whether full-year net cash costs land inside the $1.15 to $1.35 per pound range, and how much of that outcome is owed to by-product prices rather than the competitiveness programme. The third is the Centinela Second Concentrator schedule through 2027, since commissioning marks the point at which several years of capital spending begins converting into tonnes. The fourth is the final dividend decision, which will show whether the board again tops up above the 35 per cent floor.

What would change the picture most is a sustained move in the copper price, in either direction, because of how directly it feeds margins, the dividend formula and the net debt ratio at once. A useful way to frame an Antofagasta stock analysis is therefore to separate the parts of the business management controls, namely costs, capital discipline and project delivery, from the part it does not, namely the price of the metal it sells.