Amerigo sees death of six from rockfall at El Teniente

Executive Summary

• A seismic event at Codelco’s El Teniente mine caused a rockfall that killed six workers and halted operations at the mine, which supplies fresh tailings to Amerigo’s Minera Valle Central (MVC) operation.
• MVC will shift to processing historic tailings while El Teniente remains shut; daily copper production loss is estimated at ~100,000 lb.
• The company cannot yet quantify the impact on its annual production guidance pending the duration of the suspension.

Key Details

• Incident: Seismic event on 31 July 2025 triggered rockfall in the Andesita sector of El Teniente underground mine (owned by Codelco).
• Casualties: Six mine workers died; several others were trapped before rescue efforts began.
• Operational Response: Codelco suspended all mining at El Teniente and initiated search‑and‑rescue operations, concluding on 3 August 2025. Chile’s President declared three days of national mourning.
• Impact on MVC: With fresh tailings unavailable, MVC will process historic tailings until El Teniente resumes production.
• Production Loss Estimate: Approximate daily copper loss of 100,000 lb (≈45 t) for MVC while the mine is offline.
• Guidance Uncertainty: Amerigo cannot quantify the effect on its annual copper production guidance at this time; impact will depend on length of El Teniente’s shutdown.

Notable Quotes

“This tragic event deeply saddens everyone at Amerigo and MVC.” – Aurora Davidson, Amerigo Resources Ltd.