Colombia Update

Orosur Mining Inc - exceptional results continue at Pepas

• Assays from four more holes at Pepas - exceptional results continue

o PEP022 - 76.3m @ 7.24g/t Au (from surface)

o PEP021 - 107.05 @ 6.22 g/t Au (from surface)

o PEP020 - 54.65m @ 1.94 g/t Au (from surface)

o PEP019 - 44.3m @ 1.63 g/t Au (from surface)

Surface sampling defines potential to the north

London, February 4th, 2025. 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

The Anzá Project is 100% owned by the Company following recent completion of a Share Purchase Agreement (SPA), announced 28th November 2024, whereby the Company purchased all of the shares of its previous JV partner, Minera Monte Aguila (MMA).

Pepas

Figure 1. Anzá Project - prospects

After completion of the transaction to buy MMA, the Company restarted drilling at the Pepas prospect in mid-November 2024.

Later holes were then rotated some 51 degrees clockwise from PEP012 to begin to test what was considered by Company geological teams to be the controlling trend of SE to NW. The primary objective of the first phase of drilling by the Company was to attempt to understand the geological controls upon mineralisation first identified in 2022, so as to provide guidance for later step out drilling.

Holes drilled and announced to date (PEP012 to PEP018) have all intersected thick sequences of gold mineralisation, that seem to be bounded on each side by two faults that converge at depth (Tesorito North and Tesorito South faults). Recent drilling continues to improve the geological understanding of the lithostructural architecture of the mineralised zone.

Figure 2. Plan of holes

Holes PEP019 and PEP020 were both drilled from the same pad in the SE of the mineralised zone to test continuity of mineralisation and to examine some additional structures that had been identified at surface in this location (Figure 3).

Both holes entered broken ground at shallow depth, potentially indicative of a N-S fault that will require more examination. The fault zone, however, was substantially mineralised, with the holes recording high quality intersections of 44.3m @ 1.63g/t Au and 54.65m @ 1.94 g/t Au respectively, both from surface.

Figure 3. Section, PEP019 and PEP020

Holes PEP021 and PEP022 were drilled from the same pad, on section with PEP014 in the centre of the mineralised zone, but in the opposite direction to PEP014, to define the nearly identified Tesorito South fault, which thus far had only been intersected at a very shallow angle in holes PEP016 and PEP018.

Both holes entered high grade gold mineralisation immediately from surface, which continued at a consistent level until intersection of the Tesorito South fault (Figure 4).

The holes returned exceptional gold intersections of 107.05m @ 6.22g/t Au and 76.3m @ 7.24g/t Au respectively, both from surface.

Figure 4 Section PEP021 and PEP022

Hole PEP022 encountered a second fault toward the bottom of the hole, possibly indicative of a small N-S fault, intersected at a shallow angle. This fault zone was mineralised to a low level of less than 0.3g/t Au but was included in the above quoted composite intersection as it was felt its thickness may have been exaggerated due to the shallow angle of intersection. If this fault zone were removed from calculation, the composite intersection of PEP022 would instead be 62.95m @ 8.73g/t Au, from surface.

Drill intersections for these four holes are as follows:

Table 1. Drill Intercepts

Surface Sampling

The Pepas prospect was originally identified by regional BLEG sampling in late 2021, with high grade surface outcrop then being discovered early in 2022 and immediately drilled.

Little or no surface geochemical sampling was undertaken prior to drilling.

However, upon taking control of the Project post completion of the MMA transaction in late November 2024, the Company took possession of all historical databases. It was then noted that some substantial ridge and spur soil sampling programs had been undertaken in the region post drilling, later in 2022. The Company had not previously been aware of these data.

Analysis of these data (Figure 5) not only clearly shows the Pepas area as being highly anomalous but also shows an area to the north of even more extensive soil anomalism. The current area of Pepas that has been drilled, covers roughly half of N-S extent of the southern anomaly (Figure 5) marked as "Pepas".

The northern area marked as "Pepas 2" is untouched. Combined, the two zones cover some 1000m of strike.

Figure 5. Pepas soil sampling

These soils, while extremely anomalous, are limited in by being constrained to ridges and spurs - a common strategy in steep terrain to ensure samples are in-situ.

As a result, over the last several weeks, Company geological teams have been active in this northern area, mapping the flanks of these ridges for in-situ, residual material that could provide more targeting guidance.

A number of areas of mineralised material have been identified, with one large area along a small walking track exposing saprolite and semi-fresh rock. Over 100m of mineralisation was identified at surface, with samples taken at 1m intervals over the entire length of the exposure. Assay results averaged 1.15g/t Au over 105m, with individual samples at times exceeding 5g/t Au (Figure 6.). This channel sample is at the southern extreme of the new Pepas 2 anomalous area, but over 200m north of the limit of current drilling.

No work has yet been undertaken on the majority of the zone.

Figure 6. Channel Samples

Mapping and sampling programs continue in this northern area, with a view to potential drilling at a later date once the current Pepas area is better defined.

Discussion and ongoing drilling

Since the Company reassumed control of the Project, 11 holes have been completed for 941m. All holes have returned substantial gold intersections, particularly in the centre of the currently drilled area where assays results have been exceptional (Table 2)

Table 2. Results to date, post MMA transaction

While some understanding of the form of the Pepas mineralisation is beginning to emerge, this represents a relatively limited amount of drilling and can be considered as preliminary testing at best.

As we are very encouraged by these early results, we will continue the drilling programme, although for the foreseeable future the Company will operate conservatively within its cash and personnel constraints and continue with only one drill rig; defining, expanding and understanding the current Pepas body, thus freeing up a team to examine the large anomalous area abutting to the north.

Orosur CEO Brad George commented:

"In some nine weeks (including the Christmas break), and less than 1000m of drilling, we have moved Pepas from a concept to one of the most exciting exploration stories in the gold space. It is very early days, but the results obtained thus far, if continued, could see the project advance very quickly."