Orosur Mining hits discovery at El Cedro

First hole at El Cedro intersects a broad zone of gold mineralization within an extensive intrusive-hydrothermal system.

Partial results from first hole at El Cedro show gold mineralisation from surface. CED001 - 61.35m @ 0.93g/t Au (from surface)

Including 42.15m @ 1.02 g/t from 19m.

Target vein system intersected at 100m, as anticipated - assays pending.

Drilling continues with planned hole depth of 500m.

London, United Kingdom--(Newsfile Corp. - September 15, 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 totalling 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 focussed its attention on three prospects:

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

APTA - a high-grade body 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 and associated flanking hydrothermal systems in the south of the Project area at which drilling has just commenced with first results released today.

Figure 1. Anzá Project Location

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El Cedro The El Cedro prospect lies to the south of the same integrated licence that