Mediation Chile

Centinela Copper Mine Strike Heads to Mediation in Chile

By ADR Journal Editorial Desk Published 1 source Alternative Dispute Resolution Chile Copper Mining Labour Disputes Mediation Chile

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TL;DR

  • 709 workers at Chile's Centinela mine are on strike since 7 October 2026.
  • Mandatory government mediation ended without agreement; voluntary mediation set for 13 October.
  • Unions' main grievance is pay parity, not the headline wage increase or bonus.
  • Unions warn of a 50% output drop in November if mediation fails; Antofagasta maintains current guidance.

Overview

Unions representing about 709 workers at Centinela, a major copper mine operated by Antofagasta in northern Chile, will enter voluntary mediation with management on 13 October 2026. The strike began after mandatory mediation failed, and unions project a potential 50% fall in November copper output if a resolution is not reached.

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What Happened

On 7 October 2026, approximately 709 workers at Centinela, representing about 22% of the workforce, began a legal strike after mandatory mediation by Chile's labour inspectorate concluded without agreement.

The main unresolved issue is pay parity between unions, rather than the size of the pay increase and bonus offered by Antofagasta.

Voluntary mediation between management and the two unions is scheduled for 13 October 2026 in Antofagasta, after the strike had already lasted nearly a week.

Unions warn that if the strike persists, copper output at Centinela could fall by approximately 50% in November, while the company maintains its output guidance for 2026.

Context

Centinela is one of Antofagasta's largest copper mines, producing about one-third of the company's group output.

Chile is the world's largest copper producer, and recent labour disputes at major mines, including Centinela and Escondida, are contributing to upward pressure on global copper prices.

The mine is undergoing a US$4.4 billion expansion, adding to the urgency of a resolution.

Why It Matters

  • The mediation outcome will determine whether the ongoing strike escalates into a wider supply disruption in the global copper market.
  • A prolonged strike could significantly reduce Centinela's copper output, impacting Antofagasta's overall production guidance during a period of high copper prices.
  • The core dispute over pay parity highlights ongoing labour relations issues within Chile's mining sector, affecting workforce stability.

Sources

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