Mr. Louis Castro reports

OROSUR MINING INC. ANNOUNCES PEPAS WEST EXPANDING

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

Pepas West expanding:

• Continuing drilling at Pepas West continues to show positive results:
  • PEP085 -- 16.1 metres at 2.68 grams per tonne gold;
  • PEP087 -- 21.7 metres at 1.42 grams per tonne gold;
  • PEP088 -- 9.8 metres at 1.41 grams per tonne gold;
  • PEP090 -- 23.45 metres at 2.98 grams per tonne gold;
• Hole PEP090 stepped out 30 metres north of previous holes, demonstrating extension potential;
• Rig currently drilling south of Pepas; will return to Pepas West in several weeks;
• Hole MAP-106 at Apta now in the target zone.

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 by two Colombian companies, Minera Anza and Minera Monte Aguila, both wholly owned subsidiaries of the company. The latter of these was acquired by Orosur in November, 2024, from the company's previous joint venture partners, Newmont Mining and Agnico Eagle Mines. Orosur thus owns 100 per cent of the Anza project.

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 Feb. 10, 2026;
• Apta -- a high-grade body of gold mineralization that has to date seen almost 39,000 metres of historical drilling and at which drilling has recently recommenced;
• El Cedro -- a cluster of gold porphyry intrusions in the south of the project area that are currently subject to mapping and sampling programs, with a view to potentially being drilled as soon as targets can be finalized and logistics arranged.

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 (mineral resource estimate) for the Pepas gold deposit on Feb. 10, 2026.

This MRE was based upon drilling undertaken by the company and its previous JV partner from 2022 to late 2025. Results from the final hole included in the MRE, PEP074, were announced on Jan. 8, 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.

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.

This zone had been first identified in two drill holes from early 2025, but only returned to in early 2026 once the Pepas MRE had been completed.

A number of holes (PEP082 to PEP090) have now been completed into this zone, from various positions and in various directions, in order to gain some understanding of the nature, orientation and controls upon this zone. Results thus far are highly encouraging with thick intersections of shallow gold mineralization being recorded. Particularly encouraging was PEP090, drilled approximately 30 metres northwest of previous holes, demonstrating mineralization over 100 metres in strike with untested strike extension.

As previously announced, after completion of hole PEP090, the rig operating at Pepas has been moved southward to other targets, to allow time for geological and assay information from Pepas West to be compiled. This is a continuing process; however, the company's geological team notes that Pepas West is worthy of follow-up and it is planned that the rig will return here in several weeks to begin to define the size of this mineralized zone.

Apta

The Apta prospect in the centre of the project area has seen almost 39,000 metres of drilling by various companies since 2012. This work has identified a substantial epithermal gold system.

The last phase of drilling was undertaken by the company's previous JV partner, MMA, from late 2020 through early 2022, at which time the abatement of COVID-19-related operational restrictions allowed MMA field crews to begin to explore the wider Anza project area. Results from the final holes of this phase of work were announced on June 27, 2022.

A new phase of drilling was commenced some weeks ago, with hole MAP-106 planned to assess several new geological concepts to assist in planning a larger drill campaign that may, if successful, allow Apta to move to resource status.

Progress of MAP-106 has been very slow due to several zones of difficult and broken ground. However, the hole is now well past 300 metres and within the target zone. Going forward, new drill pads are being developed in different locations such that these issues are not repeated.

Orosur chief executive officer Brad George commented: "It is encouraging to see Anza now beginning to delivery on its promise. Pepas now has a resource, with more being found nearby, Apta being drilled and El Cedro yet to come."

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.