Pepas West Developing

• Drilling to test recently discovered high grade (>70g/t Au) surface samples along strike of Pepas West

London, July 8th, 2026. 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 exploration project at Anzá in Colombia ("Anzá" or the "Project").

Anzá - Colombia

Since acquiring 100% control, 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 on February 10th 2026.
• APTA - a high-grade body of gold mineralisation that has to date seen over 39,000m of drilling, with drilling ongoing.
• El Cedro - a cluster of gold porphyry intrusions in the south of the Project area. Extensive mapping and sampling programs have been undertaken and planning for the first drill program undertaken at the prospect is well advanced.

Figure 1. Anzá Project

Pepas

Following completion of the MRE drillout in late 2025, the Company then embarked on a semi-regional drilling program around the Pepas deposit. The objective of this drilling program was to better understand the larger scale litho-structural controls that led to formation of the Pepas deposit, such that, in combination with additional mapping and sampling in the wider region, vectors toward additional mineralisation might be developed.

Two distinct prospect areas are included in these results.

Four holes (PEP091 to PEP094) were drilled several hundred metres to the south of the Pepas deposit, to test a large area of silicification. However, no significant gold mineralisation was intersected.

As announced on April 14th, 2026, a new zone of mineralisation, geologically similar to Pepas, has been discovered approximately 100m west of the main Pepas zone.

The additional five holes (PEP095 to PEP099) were drilled around and beyond the northern extent of Pepas West in order to better understand controls upon this mineralisation and its possible breadth and strike extent.

The results of these five holes are mixed, with gold grades generally lower than Pepas, perhaps suggestive of the host rock not being as attractive for mineralising fluids, due to being less silicified. The zone is also narrower than Pepas, with a different structural setting, and its relationship to Pepas is yet to be determined.

Table 1. Latest drill Intercepts, Pepas Prospect

More drilling will be required to understand the controls of Pepas West, before the zone can be infilled to determine scale and tonnage. However, recent high grade surface samples have opened the potential for a substantial increase in strike length.

Figure 2. Plan of holes, Pepas West

Figure 3. Section PEP095

Figure 4. Section PEP097

Figure 5. Section PEP098, PEP099

High Grade Samples

Whilst drilling at Pepas is ongoing, mapping and sampling in the wider region continues and is regularly producing more attractive prospects and potential drill targets.

The Pepas region does present challenges with rugged terrain, and extensive soil and vegetation offering little outcrop. As a result, mapping and sampling coverage expands gradually as access tracks open areas for sampling.

As noted in the NI43-101 report (as announced on 26 March 2026 and dated 16 January 2026) for the Anzá project, all of the indicated resource for the Pepas Orebody is contained within two bounding faults. However, several smaller surficial volumes of "inferred" material sit outside these faults, including one to the Southwest that had only been intersected by three historical holes, PEP025 (10.1m @ 1.46g/t Au from surface), PEP035 (11.4m @ 2.71g/t Au from surface) and PEP040 (10.25m @ 1.35g/t Au from surface).

Figure 6. Pepas MRE shell (taken from NI43-101 report, 16th January, 2026)

This area was not followed up on due to a focus on the main Pepas zone at the time, difficult access and safety issues related to a major power line that crossed this zone.

However, as access tracks have opened for drilling, a small area of outcrop was uncovered to the Southwest of this mineralised zone, which when sampled returned high grade gold assays, with the highest being 79.6g/t Au (figure 2). This small outcrop sits directly along strike from the currently understood and trend of Pepas West, and if related, could substantially increase strike length of mineralisation to close to 200m.

Issues related to access of the power line have been resolved, and the drill rig has just begun drilling a hole to test beneath these high-grade samples.

Orosur CEO Brad George commented:

"Pepas continues to advance toward feasibility, while the broader exploration picture around Pepas West is becoming increasingly compelling. These latest results, together with the recent high-grade surface samples, reinforce our view that there remains meaningful potential to extend mineralisation along strike and to better define the scale of this developing system. Taken together, the progress across all three priority areas at Pepas, APTA and El Cedro, highlights the strength and breadth of the Anzá Project. These are exciting times for Orosur."