Orosur Mining accelerates Anza activity

Commencement of drilling at El Cedro

Increase in Project size

Further drill results from Pepas West and APTA

Auger drilling at Pepas West

London, United Kingdom--(Newsfile Corp. - September 2, 2026) - Orosur Mining Inc. (TSXV: OMI) (AIM: OMI) (" Orosur " or the " Company "), is pleased to announce an update on the progress of exploration activities at the Company's exploration project at Anzá in Colombia ("Anzá" or the "Project").

Anzá - Colombia The Anzá Project in Colombia comprises a number of granted exploration titles and applications roughly 530km 2 , within the Mid-Cauca gold belt, west of Medellín.

These titles and applications are owned 100% by two Colombian companies, Minera Anzá, and Minera Monte Aguila, both wholly owned subsidiaries of the Company.

Since acquiring 100% control of the Project, the Company has focused its attention on three prospects:

Pepas - a shallow, high-grade deposit of gold mineralisation for which the Company has calculated a Mineral Resource Estimate ("MRE"), announced February 10 th 2026.

APTA - a high-grade deposit of gold mineralisation that has to date seen approximately 40,000m of drilling since 2012, with drilling ongoing.

El Cedro - a cluster of gold/copper porphyry intrusions in the south of the Project area at which drilling has just commenced.

Figure 1. Anzá Project

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El Cedro The El Cedro prospect lies to the south of the same integrated licence that hosts both Pepas and APTA and is roughly 4km south of the APTA base camp.

Work on the area began some years before Orosur's tenure, when Anglo American undertook reconnaissance mapping and sampling, identifying a highly prospective gold/copper porphyry system. An extensive area of anomalous soil geochemistry was delineated, as well as channel samples and rock chip