New mineralised zone discovered near Pepas

• Mineralised material visually similar to Pepas with evidence of the same mineralising events.
• Orientation drilling of this new zone underway.
• Drilling at APTA commenced.
• Airborne magnetic survey commenced.

London, April 14th, 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 ore body of gold mineralisation for which the Company has calculated a Mineral Resource Estimate ("MRE"), announced February 10th 2026.
• APTA - a high-grade body of gold mineralisation that has to date seen over 38,000m 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 later in H1 2026.

Figure 1. Anzá Project

Pepas

The Company's primary focus since reassuming control of the Project in late 2024, was to explore the immediate area of Pepas, ultimately leading to the publication of a Mineral Resource Estimate ("MRE") for the Pepas gold deposit on February 10th 2026.

This MRE was based upon drilling undertaken by the Company and its previous JV partner from 2022 to late 2025. Results from the final hole included in the MRE, PEP074, were announced on January 8th, 2026.

Following completion of the MRE drillout in late 2025, the Company then embarked on a semi-regional drilling program around the Pepas deposit. The objective of this drilling program was to better understand the larger scale litho-structural controls that led to formation of the Pepas deposit, such that, in combination with additional mapping and sampling in the wider region, vectors toward additional mineralisation might be developed.

A number of holes (PEP075 to PEP081) were drilled to the NW of Pepas as several long sections (Figure 2.) to assist in developing an understanding of the macro scale structural setting within which the Pepas ore body was hosted. This included mapping the strike extensions of the Tesorito faults that bound Pepas, and to better understand the interaction between various source intrusions and associated volcanoclastic host rocks.

This program has added substantially to the Company's wider scale understanding of the area, intersecting several major structures of interest, but with generally low grades of gold mineralisation. This program was then originally planned to be continued on the SE side of Pepas to build a structural picture over the entire Pepas trend. This SE drilling program will however require some additional surface mapping and development of access tracks before it can commence.

In the meantime, following these NE sections, hole PEP082 was drilled to follow up drill intersections from two previous holes in early 2025.

Holes PEP023 and PEP024 (Figure 3.) were drilled in January/February 2025 to test anomalous channel samples and surface silicification some 100m west of the main Pepas zone. Assay results from these holes were announced on March 10th, 2025, and returned moderate gold intersections of 15m @ 1.7g/t Au and 6.35m @ 1.99g/t Au respectively. However, as grades and thickness of mineralisation at Pepas were so compelling, the Company took the decision to focus on moving Pepas to an MRE as quickly, with a plan to follow up this western area at a later date.

PEP082 was drilled to cut the mineralised zone from PEP023 from a different orientation and returned a substantial intersection of 26.4m @ 2.85g/t Au from near surface, but importantly, demonstrating the same lithologies and two same mineralising events that form the basis of the Pepas deposit, suggesting the two occurrences are likely related.

Subsequently, PEP083 was collared to the south and drilling back to toward PEP083 as the first phase of orientation drilling to better understand the form and trend of this mineralised zone. PEP083 returned a shorter, but very high-grade gold intersection from surface of 14.45m @ 8.27g/t Au, again showing the same two mineralising events.

This orientation drilling will continue for a short period of time before any step out drilling is considered. To that end, holes PEP084 to PEP086 have just been completed, with similar mineralised lithologies being visually identified.

Table 1. Latest drill Intercepts, Pepas Prospect

Figure 2. Plan of holes

Figure 3. Section PEP082

Figure 4. Section PEP083

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.

Following work done by the Company and as noted in the recently published NI43-101 report for the Anzá Project (released March 26th 2026), APTA is deemed to be of a similar geological style to Pepas, albeit somewhat deeper and in a different host rock.

The Company has undertaken its own geological studies and has developed targeting concepts to explain the emplacement of APTA and to open areas of untested exploration potential. A program of several holes is planned to test these concepts, the first of which, MAP106 commenced last week. This hole has a planned depth of 400m.

Airborne Magnetic Survey

Most of the Anzá Project area was covered by a helicopter borne magnetic/radiometric survey from 2012. However, while these data are of use, the Company considers the survey specifications and data quality to be sub-optimal, a view confirmed by comparison with a more detailed drone mounted magnetic survey undertaken by the Company over Pepas in early 2025.

A larger drone mounted magnetic survey has just commenced over the southern half of the Project area, covering the El Cedro porphyry cluster and the APTA deposit. Results are expected in the near term. It is anticipated that the results of this work will assist in drill targeting for both APTA and the El Cedro porphyry system which are currently being mapped and sampled.

Orosur CEO Brad George commented:

"We have always considered Pepas to be a small part of a larger system but held back on wider exploration until the MRE was complete. It is encouraging to have now identified extensions or repetitions of this mineralised system that will form the basis of more detailed exploration. This drilling, in conjunction with the new rig at APTA and potential drilling at El Cedro in coming months, finally sees the Anzá project being explored to its potential."