Pepas Drilling

Composite intersection of 40.2m @ 3.75g/t Au from 23.5m

including 6.8m @ 9.02g/t Au.

London, December 23rd, 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

Pepas

Figure 1. Anzá Project - prospects

The Company began drilling at the Pepas prospect in mid-November 2024, just prior to completion of the MMA purchase transaction.

Drilling commenced with hole PEP012, which was positioned to confirm previous high-grade results in hole PEP001, PEP005 and PEP007, drilled by MMA in 2022.

Holes PEP013, PEP014 and PEP015 were then rotated some 51 degrees Eastward from PEP012 to begin to test what was considered by Company geological teams to the controlling trend of SE to NW. As well as defining thick zones of high-grade mineralisation, a target for these holes was a clearly defined basement fault that seemed to act as a distinct marker bed to define the trend.

Figure 2. Plan of holes

Holes PEP013 and PEP014 both intersected the basement fault at roughly the depth predicted, and both recorded substantial intersections of high-grade gold mineralisation above the basement fault.

Hole PEP015 was collared roughly 45m to the NW of PEP014, with the same azimuth and same objective.

From surface, hole PEP015 entered a thick zone of soils, saprolite, intense weathering and faulting, that appears substantially thicker and more complex than previous holes. The hole then entered the expected mineralised zone at a downhole depth of 23.5m, until the basement fault at 63.7m.

Figure 3. Section, PEP015

In this zone, a composite intersection of 40.2m @ 3.75g/t Au was recorded.

Table 1. Drill Intercepts

Discussion and ongoing drilling

At this early stage, it would seem that the NW end of current mineralised zone is more structurally complex and slightly lower grade than the SE end, with the gold grades encountered in PEP015 being similar to that intersected by the initial drilling in 2022 in holes PEP001, PEP005 and PEP007.

The unmineralized surface zone of PEP015 is a mix of transported soil and highly weathered and altered tuffs indicative of a hanging wall fault system. This will need to be better defined by further drilling to examine its potential impact.

Hole PEP016 was collared to the SW to pierce the basement fault further down dip and to further examine these hanging wall features. This hole has been completed and samples are currently in laboratory awaiting assay.

Hole PEP017 was relocated back to the SE of the mineralised area, to test downdip of hole PEP013.

The recent capital raising has now provided sufficient funds such that the planned 800m drill program will be substantially extended. Given this extension, the drilling crews will now take a short break over Christmas before ramping up in the new Year.

Orosur CEO Brad George commented:

"Results from the drilling at Pepas continue to be outstanding - but as expected, there are complexities, as there always are. One of the objectives of this early, close spaced drilling is to identify and attempt to resolve these complexities early. This strategy appears to be working and thus far Pepas has exceeded all expectations."