An anonymous director reports

SIERRA METALS SUBSIDIARY IN PERU, SOCIEDAD MINERA CORONA REPORTS Q2 2025 FINANCIAL RESULTS

Sierra Metals Inc.'s subsidiary, Sociedad Minera Corona SA, has filed at the Lima Stock Exchange its unaudited financial statements and management's discussion and analysis for the second quarter of 2025.

The company holds an 81.84-per-cent interest in Corona.

About Sierra Metals Inc.

Sierra Metals is a Canadian mining company focused on copper production with additional base and precious metal byproduct credits at its Yauricocha mine in Peru and Bolivar mine in Mexico. The company is intent on safely increasing production volume and increasing mineral resources. Sierra Metals has recently had several new key discoveries and still has many more exciting brownfield exploration opportunities in Peru and Mexico that are within close proximity to the existing mines. Additionally, the company has large land packages at each of its mines with several prospective regional targets, providing longer-term exploration upside and mineral resource growth potential.