Mr. Louis Castro reports

OROSUR MINING INC ANNOUNCES PEPAS WEST DEVELOPING

Orosur Mining Inc. has provided an update on the progress of exploration activities at the company's exploration project at Anza in Colombia.

Anza -- Colombia

The Anza project in Colombia comprises a number of granted exploration titles and applications totalling roughly 330 square kilometres, within the Mid-Cauca gold belt, west of the city of Medellin.

These titles and applications are owned 100 per cent by two Colombian companies, Minera Anza and Minera Monte Aguila, both wholly owned subsidiaries of the company.

Since acquiring 100-per-cent control, the company has focused its attention on three prospects:

• Pepas -- a shallow, high-grade orebody of gold mineralization for which the company has calculated a mineral resource estimate (MRE), announced on Feb. 10, 2026;
• Apta -- a high-grade body of gold mineralization that has to date seen over 39,000 metres of drilling, with drilling continuing;
• 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.

Pepas

The company's primary focus since reassuming control of the project in late 2024 was to explore the immediate area of Pepas, ultimately leading to the publication of a maiden MRE for the Pepas gold deposit on Feb. 10, 2026.

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 mineralization 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 mineralization was intersected.

As announced on April 14, 2026, a new zone of mineralization, geologically similar to Pepas has been discovered approximately 100 metres 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 mineralization 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 mineralizing 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.

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.

High-grade samples

Whilst drilling at Pepas is continuing, mapping and sampling in the wider region continue and are 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 National Instrument 43-101 report (as announced on March 26, 2026, and dated Jan. 16, 2026) for the Anza 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 (10.1 metres at 1.46 grams per tonne gold from surface), PEP035 (11.4 metres at 2.71 grams per tonne gold from surface) and PEP040 (10.25 metres at 1.35 grams per tonne gold from surface).

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 mineralized zone, which when sampled returned high-grade gold assays, with the highest being 79.6 grams per tonne gold. This small outcrop sits directly along strike from the currently understood trend of Pepas West and, if related, could substantially increase strike length of mineralization to close to 200 metres.

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 chief executive officer 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 mineralization 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 Anza project. These are exciting times for Orosur."

About Orosur Mining Inc.

Orosur Mining is a minerals explorer and developer currently operating in Colombia and Argentina.

Qualified person statement

The information in this news release was compiled, reviewed, verified and approved by Brad George, BSc (honours) (geology and geophysics), MBA, member of the Australian Institute of Geoscientists (MAIG), chief executive officer of Orosur Mining and a qualified person as defined by National Instrument 43-101.

Orosur Mining staff follow standard operating and quality assurance procedures to ensure that sampling techniques and sample results meet international reporting standards.

Drill core is split in half over widths that vary between 0.3 metre and two metres, depending upon the geological domain. One-half is kept on site in the Minera Anza core storage facility in the case of the Anza project, or on site in temporary racks in the case of the El Pantano project, with the other sent for assay.

Industry-standard quality assurance/quality control protocols are put in place, with approximately 10 per cent of total submitted samples being blanks, repeats or certified reference materials (CRMs).

Samples for holes PEP-001 to PEP-011 were sent to the Medellin preparation facility of ALS Colombia Ltd. and then to the ISO 9001-certified ALS Chemex laboratory in Lima, Peru.

Samples from PEP-012 onward are sent to Medellin laboratory of Actlabs for preparation and fire assay, with some samples then sent to the Canadian Actlabs facility for multielement assay.

Samples from the EL Pantano project are sent to the preparation facility and fire assay laboratory of Alex Stewart Laboratories in Perito Moreno to be assayed for gold. Pulps are then sent to the larger Alex Stewart facility in Mendoza for multielement analysis.

Thirty-gram-nominal-weight samples are then subject to fire assay and AAS analysis for gold with gravimetric refinish for overlimit assays of greater than five grams per tonne. ICP-MS ultratrace-level multielement four-acid digest analyses may also undertaken for elements such as silver, copper, lead and zinc.

Gold intersections are reported using a lower cut-off of 0.3 gram per tonne gold over three metres.

Intersections are quoted as downhole thicknesses. True thicknesses are unknown.

We seek Safe Harbor.