Grasberg Copper Mine Recovery Delay Tightens Indonesia Supply Outlook

Grasberg Copper Mine

Grasberg copper mine recovery has been delayed after Freeport-McMoRan reported slower progress at its Indonesian operation following last year’s fatal mud rush accident. The company now expects the Grasberg Block Cave to recover more gradually than previously planned.

The Grasberg copper mine recovery delay is important because Grasberg is one of the world’s largest copper assets. Any slower restart affects global mine supply at a time when copper demand remains tied to grids, data centres, electrification and industrial policy.

The Grasberg copper mine recovery outlook has been cut because wet drawpoints increased inside the mine after the incident and subsequent suspension of mining activity. Freeport said it must upgrade ore loading infrastructure before production can recover more fully.

Freeport now expects Grasberg to reach only 65% of production capacity by the second half of this year. It previously expected the mine to reach 85% in that period.

Grasberg Restart Slows After Underground Infrastructure Issues

The progressive restart of Grasberg Block Cave has been slower than expected. The increase in wet drawpoints has limited mining activity and created a need for infrastructure upgrades.

Freeport now expects Grasberg to reach about 85% of capacity by mid-2027. The company expects the mine to approach full capacity by the end of 2027.

That marks a clear delay from the previous plan. Freeport had earlier expected Grasberg to return to full production capacity by the end of 2027.

The production impact was visible in the first quarter. Freeport’s Indonesian copper output fell by 68% on the year to 95mn lbs because of the Grasberg disruption.

Across Freeport’s global operations, copper output fell by 24% on the year to 662mn lbs. The decline shows how heavily the company’s production profile depends on a stable Grasberg recovery.

US operations partly offset the Indonesian weakness. Copper production from Freeport’s seven mines in the southwest US rose by 3% on the year to 309mn lbs.

Output from the company’s mines in Peru and Chile fell by 4.8% to 258mn lbs. Lower leach placements weighed on production across those assets.

Higher Copper Prices Offset Lower Production

Freeport’s first-quarter financial results were supported by stronger copper prices. Average copper prices rose by 30.1% on the year to $5.78/lb.

Unit production costs also improved. Freeport’s per-unit costs fell by 7.7% to $1.91/lb.

This helped offset lower production and sales volumes. Copper sales volumes fell by 25% from a year earlier, although they were 3% above Freeport’s January estimate.

Freeport’s profit more than doubled to $881mn in the first quarter. Revenue rose by 8.8% to $6.2bn.

The result shows the current copper market tension. Operational supply is weaker, but higher prices are protecting margins for major producers.

Molybdenum performance was mixed. Consolidated molybdenum production fell by 4% to 22mn lbs, while sales volumes rose by 20% to 24mn lbs.

For the copper market, the delayed Grasberg recovery adds another supply-side risk. Indonesia has been expected to support global copper growth, but mine-level disruptions continue to limit output.

The issue also reinforces a broader industry problem. Large underground copper mines can take years to stabilise after major incidents, and infrastructure bottlenecks can delay recovery even when restart work has begun.

The Metalnomist Commentary

The Grasberg delay shows why copper supply cannot be judged only by long-term resource size. A single underground disruption at a world-class mine can reshape near-term supply and strengthen copper’s strategic premium.