APTA Continues to Deliver

• Second hole (MAP107) in current drill phase reports substantial gold intersection of 135m @ 1.91g/t Au, including 49m @ 4.06g/t Au.
• Hole ended in mineralisation.
• Currently drilling from the east to test shallower potential.

London, July 14th, 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 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 ever undertaken at the prospect are well advanced.

Figure 1. Anzá Project

APTA

The APTA prospect in the centre of the Project area has over 39,000m of drilling by various companies since 2012. This work has identified a substantial epithermal gold system.

Upon assuming control of the Project in November 2024, the Company focused most of its resources on exploration at the Pepas prospect, ultimately leading to a Mineral Resource Estimate ("MRE") being calculated and announced in February 2026.

Work by Company geological teams in early 2026, developed new geological concepts for APTA, whereby gold mineralisation was thought to be constrained within silicified sediments and volcaniclastics bound by two large faults roughly 100m apart, that together make up the Aragon fault zone and acted as conduits for gold bearing fluids.

The first hole in a new drilling program (MAP106, results announced 9th June 2026) returned a long, lower grade intersection with higher grade zones at vertical levels substantially above what was expected from previous historical drilling.

Subsequently, hole MAP107 was drilled from a similar location, but targeted to intersect the same geological features, but roughly 50m to the south (figure 2) in order to test continuity of these higher-grade zones.

As with the previous hole, MAP107 intersected mineralisation almost immediately upon entering the Aragon fault zone, at a much higher level than previous drilling.

A composite intersection of 135.5m @ 1.91 g/t Au was recorded, with higher grade intervals included, especially lower in the hole (Table 1)

Figure 2. Plan of drilling

Table 1. Drill intersection MAP107

However, like the previous hole, MAP107 experienced difficult drilling conditions related to the broken ground of the Aragon fault zone, and the decision was taken to terminate the hole above the target zone of high-grade mineralisation that had been intersected in previous holes (Figure 3.)

The hole ended in mineralisation.

Results of MAP107 have supported the interpretation that the deeper levels of higher-grade mineralisation are substantially larger than previously thought. This information will assist in geological modelling that may if further results warrant, form the basis of a future MRE being developed at APTA.

Due to the difficult drilling, the decision has been made to move the rig eastward to a new access track and test the nature of shallower mineralisation drilled from the east toward the west. Pad preparation is underway and drilling at this hole (MAP108) is expected to start in several days.

Figure 3. Section, MAP-107

Table 2. Previous historical intersections, APTA

Orosur CEO Brad George commented:

"As with the previous hole, MAP107 is showing APTA to be more extensive than was previously thought. A lot more work is warranted, and we are fully funded to carry it out."