Chile Copper Production Falls as Mature Mines and Acid Costs Pressure Supply

Chile Copper minnig

Chile copper production fell sharply in the first quarter, deepening concerns over near-term supply from the world’s largest copper-producing country. Output declined by 5.8% year on year to 1.217mn t.

Chile copper production weakness was driven by lower output from mature mines, softer grades and weaker refined cathode production. March was especially weak, with national copper output down 9% from a year earlier.

Chile copper production matters because the global copper market is already facing tight concentrate availability, fragile refined flows and stronger demand from grids, electrification and data centres.

The decline reinforces a core market concern. Higher copper prices are not quickly translating into higher mine output, especially in countries where ageing assets and delayed projects continue to limit supply response.

Concentrate Output Falls as Major Mines Underperform

Chile’s copper concentrate output fell by 6% year on year to around 947,000t in the first quarter. Concentrates accounted for almost 78% of the country’s total mine output.

The weakness was visible across both state-owned and private producers. Escondida remained Chile’s largest copper mine with 311,600t in the quarter, followed by Codelco at 299,600t, including stakes in El Abra and Anglo American Sur.

Codelco’s own divisions produced around 271,600t. The company is targeting 1.344mn t this year after producing about 1.33mn t in 2025.

The first-quarter result keeps pressure on Codelco to stabilise output after several years of structural underperformance. Ageing mines, delayed projects and higher operating costs remain key constraints.

March data showed broad weakness at the largest mines. Codelco output fell by nearly 10% year on year to 110,900t, while Escondida declined by almost 16% to 101,600t.

Collahuasi, jointly owned by Glencore and Anglo American, produced 31,400t in March, down 10.8% from a year earlier. Its first-quarter output totalled 88,200t.

Other major producers also faced pressure. Los Pelambres produced 69,600t, Anglo American Sur 58,200t, Quebrada Blanca 55,500t and Spence 44,600t during the quarter.

Antofagasta produced 143,000t of copper in the quarter. The company cited lower processing rates and weaker grades at Los Pelambres and Centinela concentrates.

Teck’s Quebrada Blanca was one of the more stable performers. The mine produced 55,500t despite planned maintenance and a shorter February, supported by stronger March throughput and recoveries.

SX-EW Cathode Weakness Exposes Chile to Acid and Fuel Costs

Chile’s refined SX-EW cathode output reached 269,300t in the first quarter. January output increased, but February and March both fell from a year earlier.

Refined electrolytic cathode output was weaker at 107,000t. March production fell by 38.7% year on year, pulling total refined cathode output to about 376,300t.

This matters because Chile’s oxide and SX-EW operations are increasingly exposed to sulphuric acid availability and pricing. Acid is a reagent cost for leaching operations.

Smelters can benefit from higher sulphuric acid prices when they sell acid as a by-product. SX-EW producers face the opposite exposure, as higher acid costs directly pressure operating margins.

Higher diesel prices are adding to the problem. Codelco said Middle East-related cost increases lifted its cash cost by at least 10¢/lb.

Antucoya also showed the cost pressure. Output weakened, while costs rose by 23% year on year to $3.03/lb on higher sulphuric acid and diesel prices.

Chile’s investment pipeline remains significant but long-dated. Freeport-McMoRan has started environmental permitting for a $7.5bn expansion of El Abra.

The project aims to lift production to around 300,000 t/yr from 91,400t in 2025. But it requires a new concentrator and desalination plant and is not expected to start until the next decade.

That timing is critical for the market. Chile has projects, but they will not solve immediate supply tightness.

The first-quarter decline therefore strengthens copper’s structural bull case. Global demand is rising, while Chile’s mature mine base is struggling to deliver stable growth.

The Metalnomist Commentary

Chile’s copper problem is no longer only grade decline; it is now a combined issue of mine maturity, acid exposure, fuel costs and delayed expansion. The market should treat Chilean supply recovery as a slow process, not a quick response to record copper prices.