Antofagasta copper output falls 8% in Q1, expects recovery through the year

Antofagasta reported Q1 2026 copper production of 143,000 tonnes, down 8% year-on-year, while copper sales fell 19.5% to 137,000 tonnes. Net cash costs improved 30% to $1.08/lb, helped by by-product credits up 104% to $1.69/lb, and gold realized prices rose 70% to $5,264/oz. Full-year guidance was unchanged at 650,000-700,000 tonnes of copper output, $1.15-$1.35/lb net cash costs, and $3.4 billion capex, with production expected to rise through the year.

Analysis

The market is likely underappreciating how much of this quarter’s margin resilience is a by-product story rather than a copper story. That matters because the earnings bridge is unusually fragile: if gold/moly credits mean-revert even modestly, reported unit costs can reset sharply higher before production growth actually shows up, which creates a clean setup for a second-half margin squeeze if copper prices soften or grades disappoint.

Operationally, the real signal is not the headline production dip but the sequencing: output is expected to rise into later quarters while major growth capex stays elevated. That creates a window where free cash flow may lag the improving production narrative, especially if the new processing and desalination projects require more working capital or execution spend than guided. Competitively, this is a relative-quality positive for tier-one Chilean copper assets versus higher-cost peers, but it also raises the bar for smaller producers whose costs are more sensitive to spot by-product credits and power/fuel inputs.

The contrarian angle is that consensus may be too relaxed about guidance being unchanged. In a weak copper tape, unchanged volume and cost guidance often hides a lot of execution dependence, and the stock can de-rate if investors conclude the forward ramp is already priced in. The key catalyst window is the next 1-2 quarters: either grades and throughput improve as promised, confirming the rerating case, or the company is forced to lean more heavily on commodity credits, exposing the earnings quality issue.

Key Decisions for Investors

• Go long ANTO on any post-print weakness, but treat it as a 1-2 quarter trade; target a move into the production ramp with a tight stop if copper prices break lower and the stock fails to hold after the next operating update.
• Pair trade: long ANTO / short a higher-cost copper producer or diversified miner with weaker by-product support over the next 3-6 months; the thesis is that ANTO’s margin base is more defensible if copper stays rangebound, while peers will absorb the full impact of cost inflation.
• If already long ANTO, buy downside protection via near-dated puts into the next quarterly print; the main risk is a reversal in gold credits that would expose higher underlying cash costs before volume improves.
• Consider a relative-value long in Chilean copper infrastructure beneficiaries versus pure miners if project execution remains on track; the capex pipeline can support local services and equipment names even before ANTO’s free cash flow inflects.