Colombia update

• Assays from second hole of current drill program (PEP013) received.
• Composite intersection of 77.3m @ 7.68g/t Au from surface.
• Assays from third hole (PEP014) expected shortly.
• Drilling of fourth hole (PEP015) has been completed and assays dispatched to the lab for analysis.
• Preparation of platform for PEP016 under way.

London, December 9th, 2024. 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 flagship Anzá Project ("Project") in Colombia.

ANZÁ Project

During the JV, the Project comprised several granted exploration licences and applications totalling roughly 176km2, covering a large strike length of major structures on the mid-Cauca belt, Colombia's primary gold region (Figure 1).

Post the acquisition of MMA, the area of the Project has increased substantially to roughly 400km2 due to the acquisition of a number of additional applications that were owned by MMA. The full extent of these new applications is currently being assessed and will be detailed in a later announcement.

Figure 1 - Anzá Project (pre-MMA transaction)

Pepas

Figure 2. Anzá Project - prospects

Field work commenced at Pepas in late 2021 as the gradual abatement of Covid allowed field crews to move outside a covid bubble that had constrained their movements during the pandemic to the core APTA deposit that had up to that point been the target of most historical exploration work.

The Company mobilised a drill rig to site in mid-November with a view to a small program of approximately 800m with the dual objectives of assessing the continuity of gold mineralisation identified in previous drilling and gaining of greater understanding of the orientation of mineralisation and its lithostructural controls.

The first hole of this new program, PEP012, was collared adjacent to mapped artisanal workings and directed back toward the first of the previous JV holes (PEP001), as a scissor hole, a reasonably standard strategy in instances of uncertain geological orientation. Assay results for PEP012 were announced on 2nd December 2024, and returned an excellent intersection of 66.75m @ 5.64g/t Au from surface.

PEP013 was collared from the same pad as PEP012 but rotated 51 degrees to the east to be orientated to be more orthogonal to what is currently interpreted as the strike of the mineralisation and controlling structures.

Figure 3. Plan of holes

As with PEP012, PEP013 entered highly mineralised tuffs almost immediately, of similar nature to that seen in PEP001 and PEP012, before intersecting a basement fault at 79m, very close to the predicted depth. The hole was terminated at 85m.

Figure 4. Section, PEP013

The entire length of PEP013 above the fault, was mineralised with a composite intersection of 77.3m @ 7.68g/t Au being calculated, from surface.

Table 1. Drill Intercepts

Discussion and ongoing drilling

Hole PEP012 was designed largely as a confirmatory hole, to verify previous drilling undertaken by the Company's former JV partner in 2022, and to gain better understanding of the nature and orientation of the recorded mineralisation.

Hole PEP013 was drilled in a direction that was deemed to be more orthogonal to what is currently interpreted as the trend of the mineralisation, roughly SE to NW. Intersection of the basement fault at close to the predicted depth, lends weight to this interpretation.

Later holes PEP014 and PEP015 are positioned on the same dip and azimuth as PEP013 but shifted to the NW (Figure 3) by various separations, to a large extent driven by access for drill pad creation. The objective of these holes is to further define mineralisation, and to provide sufficient pierce points into the basement fault to allow more reliable interpretation of the mineralisation trend.

Hole PEP016 is a deeper hole located some distance to the SW that is planned to test downdip extensions and to begin the process of assessing the wider extent of the Pepas mineralisation.

PEP014 has been completed and assays should be available shortly. PEP015 has been completed and assays have been dispatched to the lab for analysis, whilst preparation of the platform for the drilling of PEP016 is under way.

Orosur CEO Brad George commented:

"Results from PEP013 are little short of exceptional in terms of thickness and grade, especially from surface. But of equal importance is the information this hole has provided in relation to the form and orientation of the Pepas mineralisation. A few more like this and perhaps we can then start to step out and define its size".