Mr. Louis Castro reports

OROSUR MINING INC ANNOUNCES EXTENSION OF PEPAS WEST

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

Highlights:

• Results from six holes released, including:
  • PEP101 -- 6.4 metres at 2.81 grams per tonne gold from surface;
  • PEP102 -- 6.85 metres at 2.18 g/t Au from surface;
  • PEP103 -- 10.2 metres at 5.77 g/t Au from surface;
  • PEP104 -- 19.8 metres at 1.77 g/t Au from surface;
  • PEP105 -- 15 metres at 2.03 g/t Au from surface;
• Confirmation of extensive, flat-lying body of mineralization -- will test different drilling techniques to accelerate definition.

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 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 of the project, the company has focused its attention on three prospects:

• Pepas -- a shallow, high-grade deposit 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 approximately 40,000 m 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 a rig is currently being mobilized to commence the first drill program ever undertaken at the prospect.

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.

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 and ounces added to inventory.

The company achieved immediate success with a new zone of shallow mineralization being identified roughly 100 metres to the west of Pepas -- with first results announced on April 14, 2026.

Drilling has continued sporadically at Pepas West, with occasional pauses to allow access tracks to be developed; however, results from these six additional holes (PEP100 to PEP105) continue to demonstrate an extensive zone of surficial, high-grade gold mineralization.

Initial drilling at Pepas West had suggested the zone was geologically similar to Pepas, with the same mineralizing events, but with a different, parallel structural setting.

Recent drilling, however, is developing a more complex picture with the higher-grade surficial mineralization seemingly a mix of in situ and heavily weathered material that has potentially remobilized downslope from Pepas.

While deeper zones remain unresolved, a picture is emerging of a flat-lying, surface-mineralized zone of perhaps 10 m thick, over a wide area, with mineralization starting from near surface, grading between one and five g/t Au, and often obscured beneath a thin veneer of barren transported soil.

The zone is extensively weathered, with scattered enclaves of fresh quartz veins, with very little residual geological or structural texture remaining and, as such, the original litho-structural setting is difficult to determine. Additional drilling and geological studies will be undertaken to endeavour to understand the genesis of Pepas West.

The company considers this free-digging, flat-lying, surficial, high-grade oxide gold mineralization to be a high priority in a near-term production scenario, from the point of view of cost and time required to define, develop and mine. Thus, instead of the currently employed diamond-core drilling, the company will examine the potential of utilizing a smaller auger rig to more rapidly define the volume and grade of this extensive surface zone while also examining the potential for an auger system to be used on a regional basis to sample beneath transported cover. This trial is expected to commence in coming weeks.

The current diamond rig will remain on site and be focused on deeper drilling around Pepas West and other targets.

Orosur chief executive officer Brad George commented: "The geological nature of Pepas West is complex as a result of mixing of totally weathered and transported material. However, the grade is there, which in the end is all that matters. With Pepas entering feasibility and permitting, additional cheap ounces are worth their weight in gold."

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 m and two m, 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.

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 g/t. ICP-MS ultratrace level multielement four-acid digest analyses may also undertaken for such elements as silver, copper, lead and zinc.

Gold intersections are reported using a lower cut-off of 0.3 g/t Au over three m.

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

We seek Safe Harbor.