Mr. Brad George reports

OROSUR MINING INC ANNOUNCES APTA CONTINUES TO DELIVER

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 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 ever undertaken at the prospect are well advanced.

Apta

The Apta prospect in the centre of the project area has over 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 joint venture 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.

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 mineralization was thought to be constrained within silicified sediments and volcaniclastics bound by two large faults roughly 100 metres apart, which 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 June 9, 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 50 metres to the south in order to test continuity of these higher-grade zones.

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

A composite intersection of 135.5 metres at 1.91 grams per tonne gold was recorded, with higher-grade intervals included, especially lower in the hole (Table 1).

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 mineralization that had been intersected in previous holes.

The hole ended in mineralization.

Results of MAP107 have supported the interpretation that the deeper levels of higher-grade mineralization 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 mineralization drilled from the east toward the west. Pad preparation is under way and drilling at this hole (MAP108) is expected to start in several days.

Orosur chief executive officer 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."

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, a 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.

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 are sent to the 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 grams per tonne. ICP-MS ultratrace level multielement four-acid digest analyses may also be undertaken for elements such as silver, copper, lead and zinc.

Gold intersections are reported using a lower cut-off of 0.1 gram per tonne gold over three metres.

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

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