Pepas drilling continues to intersect high grades

Orosur Mining Inc - Pepas definition drilling continues to intersect high grades.

• Assays for five more holes from the Pepas MRE infill program include:

o PEP060 - 63.55m @ 8.23g/t Au

o PEP064 - 49.95m @ 4.29 g/t Au

• Mid-program Resource drilling review underway.

London, October 7th, 2025. Orosur Mining Inc. ("Orosur" or the "Company") (TSXV/AIM:OMI), is pleased to announce an update on the progress of exploration activities at the Company's flagship, 100% owned, Anzá Gold Project ("Project") in Colombia.

Anzá - Colombia

As announced on 14th July 2025, the Company took the formal decision to commence infill drilling at its Pepas gold prospect at Anzá, with the objective of moving Pepas to a NI43-101 compliant Mineral Resource Estimate (MRE) by the end of the year.

This drilling program continues to progress well and remains on target, subject to a mid-program review. Drilling is currently focussing on locating and defining the margins to mineralisation and on better understanding the geological controls on the high grade that is evident in the central part of the Pepas orebody.

Results from these five holes remain consistent with expectations and continue to develop the geological model that is required as part of the Mineral Resource process.

Table 1. Latest drill Intercepts, Pepas Prospect

Figure 1. Plan of holes

Figure 2. Section, PEP060

Figure 3. Section, PEP064

The Company is currently engaging with its geological consultants in advance of formally triggering the MRE process to ensure that work on the deposit is sufficiently advanced, and that all the necessary inputs are prepared ahead of the required site visit by the resource consultants, probably at the start of November.

Orosur CEO Brad George commented:

"Pepas continues to move inexorably forward. The NI43-101 MRE process is rigorous, but all of the pieces are falling into place".

Colombia - ANZÁ Project

The Anzá Project is now 100% owned by the Company following completion of a Share Purchase Agreement ("SPA"), announced 28th November 2024, whereby the Company purchased all of the shares of its previous JV partner; Minera Monte Aguila ("MMA").

The Project, which is located 50km west of Medellin, is easily accessible and boasts excellent infrastructure including water, power and communications as well as a large exploration camp.

From September 2018 to November 2024, the Anzá Project was under the control of its previous JV partner MMA, itself a 50/50 venture between the world's two largest gold miners, Agnico Eagle Mines and Newmont Mining.

Prospects

The Company is currently focussed on three prospects within the Anzá Project - Pepas, APTA and El Cedro. All three prospects are within the same granted exploration title that is broken into two, non-contiguous pieces (Figure 2).

Drilling is currently being undertaken at the Pepas prospect in the northern extent of the Anzá Project (pre-acquisition) over 10km north of the central base camp at APTA. In parallel, mapping and sampling is being undertaken over the El Cedro porphyry system in the south of the project area.

Figure 3. Main prospects, licences and applications pre-MMA acquisition

Holes Drilled post MMA Transaction

53 holes have been drilled at Pepas since the MMA Transaction in November 2024.

Assay results are tabulated below.

Table 2. Results to date, post MMA Transaction