Santiago, October 27, 2025.- During the week of October 20-26, Vivianne Blanlot and Eduardo Bartolomeo, members of the International Experts Group (IEG) investigating the El Teniente accident, held an intense agenda of meetings and interviews with division executives, Codelco vice presidents, and members of the board of directors. The experts' work seeks to conduct an independent and exhaustive assessment of the technical, operational, human, cultural, and organizational factors linked to the accident that occurred on July 31.

In parallel, two informational meetings were held to share preliminary results of the internal investigation into the accident: one with the Technical Roundtable for Safe Return—which brings together representatives and union leaders from collaborating companies—and another with representatives and executives from 57 contracting companies that provide services to the division.

Likewise, the Labor Directorate initiated an inspection process requested by Codelco to update critical positions and remove machinery in the Andesita and Recursos Norte sectors. The investigations by the PDI and the Rancagua Prosecutor's Office inside the mine also continued, along with field inspections by Sernageomin.

In terms of assistance, information and support continue to be provided to the families of deceased workers. Additionally, on Wednesday, October 22, El Teniente's general manager, Claudio Sougarret, and the executive committee led a safety workshop with managers and contract administrators from partner companies, as part of the Safe and Progressive Restart of Operations Plan.

Regarding operational status, the restart plan continues to advance. The average workforce on Shift A was 9,127, of which 2,089 entered the mine interior; while Shift C reached 2,262, with 768 admissions. Grinding throughput reached an average of 91.8 thousand tons per day (Sewell plus Colón), with 79.2 thousand tons sent to the Colón plant and 11.7 thousand tons to the Sewell plant. The plant maintained operations in SAG2 and Conventional, with SAG1 undergoing bimonthly maintenance until Friday, October 24. Starting Saturday, October 25, dual SAG1 plus SAG2 operation resumed, albeit with low stockpiles due to supply restrictions.

At the foundry, operations remained stable with the Teniente 1 Converter (CT1) and the Gas Cleaning Plant No. 2 (PLGN2), achieving a concentrate melting of 2,725 tons per day and an average molding of 483 fine metric tons per day.

Codelco reaffirms its commitment to safety, transparency, and collaboration with the competent authorities, as well as to the well-being of its employees and their families, maintaining all necessary actions to ensure a safe and sustained restart of operations.

Codelco