Amerigo processing fresh tailings at Minera Valle

Executive Summary

• Amerigo Resources’ Minera Valle Central (MVC) resumed processing fresh tailings from the El Teniente underground copper mine on Aug 10, 2025 after a seismic‑induced shutdown.
• Only 8 of the 12 underground sectors at El Teniente have been cleared to restart; four remain shut, limiting fresh‑tailings supply and causing daily throughput to fall below MVC’s 2025 production forecast.
• Amerigo will offset the shortfall by increasing processing of historic tailings and will issue a production update once new throughput data are available.

Key Details

• Restart Approval: Chile’s National Geology and Mining Service and Labour Directorate approved restart of operations in eight underground sectors on Aug 9, 2025.
• Fresh Tailings Intake: MVC began receiving fresh tailings during the night of Aug 10, 2025; processing commenced immediately.
• Production Impact: Expected daily throughput from fresh tailings will be lower than originally forecast in MVC’s 2025 production schedule until El Teniente returns to full capacity.
• Mitigation Plan: Amerigo intends to mitigate the shortfall by ramping up processing of historic tailings already on hand at MVC.
• Future Update: Management will provide a revised production outlook once actual throughput data from El Teniente are collected over the coming days.

Notable Quotes

“To the extent possible, MVC will mitigate any production impacts by increasing the processing of historic tailings,” – Aurora Davidson, President & CEO, Amerigo Resources Ltd.
“Once we have data on El Teniente’s throughput over the next few days, we will provide a production update.” – Aurora Davidson

Materiality Assessment: Material – Neutral (the operational restart and reduced fresh‑tailings supply materially affect near‑term production volumes but do not indicate a change in financial condition or earnings guidance at this time.)