New mineralised zones discovered at APTA

• First new hole at APTA (MAP-106) returns 229.7m @ 0.88g/t Au.
• Numerous higher-grade intervals within broader intersection, including:

o 6.85m @ 2.15g/t Au

o 59.2m @ 2.15g/t Au

o 7.65m @ 7.07g/t Au

o 4.7m @ 3.95g/t Au

• Results have substantially enhanced the prospectivity of APTA with three areas of potential requiring follow up.

London, June 9th, 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 deposit of gold mineralisation for which the Company has calculated a Mineral Resource Estimate ("MRE"), announced February 10th 2026.
• APTA - a high-grade deposit of gold mineralisation that has to date seen almost 39,000m 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 in the near term.

Figure 1. Anzá Project

APTA

The APTA prospect in the centre of the Project area has seen almost 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 MRE being calculated and announced in February 2026.

However, during this drill-out phase, Company field teams also undertook mapping and sampling programs at the El Cedro prospect and desktop reassessment of significant previous drilling undertaken at the APTA prospect.

APTA was the original prospect upon which the Anzá Project was based. Gold mineralisation was originally discovered underneath a small artisanal gypsum mine, leading to sporadic drilling through to 2022. Despite many holes intersecting substantial intervals of very high-grade gold mineralisation, there remained substantial debate as to the underlying geological model and controls upon mineralisation. As a result, despite almost 39,000m being drilled, no MRE was ever calculated.

Work by Company geological teams in early 2026, developed new geological concepts 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.

Hole MAP-106 was collared outside the fault zone to the west and oriented to intersect the footwall fault, thought to be the main fluid conduit which would then intersect the mineralised zone at a much shallower depth than previous drilling, eventually targeting previously defined mineralisation at depth. However, the footwall fault zone presented substantial drilling challenges resulting in some redrilling and adjustment to the planned azimuth, with the final hole being referred to as MAP-106A.

Figure 1. Plan of drilling, APTA

The hole intersected gold mineralisation almost immediately upon passing the footwall fault, at a vertical depth of roughly 70m, with mineralisation continuing for a considerable distance for a composite intersection of 229.7m @ 0.88g/t Au (Table 1)

Within that broad lower grade intersection there were numerous higher-grade intersections consistent with and expanding upon previous drilling (Table 2). The exact controls upon these higher-grade zones are still being assessed but are likely, as with Pepas, to be related to various phases of silicification and mineralising events within the volcaniclastic core.

Figure 2. Section, MAP-106A

Table 2. Previous historical intersections, APTA

The desktop review and the results from MAP-106A have modified the Company's thinking of the origins of APTA and substantially increased its prospectivity, with three areas of potential now requiring follow-up (Figure 3).

Figure 3. APTA follow-up

Firstly, this hole has confirmed and expanded the potential scale of the deeper, higher-grade mineralisation that was defined by previous drilling (Area A). Previous work has defined a mineralised zone over 1km in length and up to 100m in width, although poddy in nature. This hole has greatly assisted in better understanding the controls upon this mineralisation and future drilling will be planned to expand and then infill this zone.

Secondly, no shallow drilling has ever been undertaken within the fault bound mineralised zone, and minimal surface geochemistry has been undertaken as the zone is hidden by barren transported cover. However, one small, mineralised outcrop was mapped historically, opening the possibility that gold mineralisation could extend to near surface (Area B). A program of shallow drilling will be developed to better understand this shallow, bulk tonnage potential.

Thirdly, a narrow, hanging wall mineralised vein (Area C) had been defined by previous drilling but never examined as previous work was focused on the thicker mineralisation at depth. However, this vein seems to show reasonable continuity, as well as sufficient grade and thickness to potentially be amenable to exploitation. Additional drilling will be required to expand the scale of this vein system.

Orosur CEO Brad George commented:

"APTA was always tantalising but misunderstood as previous drilling was never pulled together into a coherent picture. After almost 15 years, this is now being done, and looking exciting."