Pepas West Developing

Pepas West Developing

·    More gold intercepts at Pepas West

·    Pepas West picture continues to develop

·    Drilling to test recently discovered high grade (>70g/t Au) surface samples along strike of Pepas West

London, July 8^th, 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

The Anzá Project in Colombia comprises a number of granted exploration titles and applications totalling roughly 330km², within the Mid-Cauca gold belt, west of the city of Medellín.

These titles and applications are owned 100% by two Colombian companies, Minera Anzá, and Minera Monte Aguila, both wholly owned subsidiaries of the Company.

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 on February 10^th 2026.

·    APTA - a high-grade body of gold mineralisation that has to date seen over 39,000m of drilling, with drilling ongoing. 

·    El Cedro - a cluster of gold porphyry intrusions in the south of the Project area.  Extensive mapping and sampling programs have been undertaken and planning for the first drill program undertaken at the prospect is well advanced.

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 maiden MRE for the Pepas gold deposit on February 10^th, 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.

Two distinct prospect areas are included in these results.

Four holes (PEP091 to PEP094) were drilled several hundred metres to the south of the Pepas deposit, to test a large area of silicification. However, no significant gold mineralisation was intersected.

As announced on April 14^th, 2026, a new zone of mineralisation, geologically similar to Pepas, has been discovered approximately 100m west of the main Pepas zone.

The additional five holes (PEP095 to PEP099) were drilled around and beyond the northern extent of Pepas West in order to better understand controls upon this mineralisation and its possible breadth and strike extent.

The results of these five holes are mixed, with gold grades generally lower than Pepas, perhaps suggestive of the host rock not being as attractive for mineralising fluids, due to being less silicified. The zone is also narrower than Pepas, with a different structural setting, and its relationship to Pepas is yet to be determined.

Table 1. Latest drill Intercepts, Pepas Prospect

More drilling will be required to understand the controls of Pepas West, before the zone can be infilled to determine scale and tonnage. However, recent high grade surface samples have opened the potential for a substantial increase in strike length.

Figure 2.  Plan of holes, Pepas West

Figure 3. Section PEP095

Figure 4. Section PEP097

Figure 5. Section PEP098, PEP099

High Grade Samples

Whilst drilling at Pepas is ongoing, mapping and sampling in the wider region continues and is regularly producing more attractive prospects and potential drill targets.

The Pepas region does present challenges with rugged terrain, and extensive soil and vegetation offering little outcrop. As a result, mapping and sampling coverage expands gradually as access tracks open areas for sampling.

As noted in the NI43-101 report (as announced on 26 March 2026 and dated 16 January 2026) for the Anzá project, all of the indicated resource for the Pepas Orebody is contained within two bounding faults. However, several smaller surficial volumes of "inferred" material sit outside these faults, including one to the Southwest that had only been intersected by three historical holes, PEP025 (10.1m @ 1.46g/t Au from surface), PEP035 (11.4m @ 2.71g/t Au from surface) and PEP040 (10.25m @ 1.35g/t Au from surface).

Figure 6.  Pepas MRE shell (taken from NI43-101 report, 16^th January, 2026)

This area was not followed up on due to a focus on the main Pepas zone at the time, difficult access and safety issues related to a major power line that crossed this zone.

However, as access tracks have opened for drilling, a small area of outcrop was uncovered to the Southwest of this mineralised zone, which when sampled returned high grade gold assays, with the highest being 79.6g/t Au (figure 2). This small outcrop sits directly along strike from the currently understood and trend of Pepas West, and if related, could substantially increase strike length of mineralisation to close to 200m.

Issues related to access of the power line have been resolved, and the drill rig has just begun drilling a hole to test beneath these high-grade samples.

Orosur CEO Brad George commented:

"Pepas continues to advance toward feasibility, while the broader exploration picture around Pepas West is becoming increasingly compelling. These latest results, together with the recent high-grade surface samples, reinforce our view that there remains meaningful potential to extend mineralisation along strike and to better define the scale of this developing system. Taken together, the progress across all three priority areas at Pepas, APTA and El Cedro, highlights the strength and breadth of the Anzá Project. These are exciting times for Orosur."

For further information, visit www.orosur.ca, follow on X @orosurm or please contact:

Orosur Mining Inc

Louis Castro, Chairman,

Brad George, CEO

[email protected]

Tel: +1 (778) 373-0100

SP Angel Corporate Finance LLP - Nomad & Joint Broker

Caroline Rowe / Jen Clarke / Devik Mehta

Tel: +44 (0) 20 3470 0470

Turner Pope Investments (TPI) Ltd - Joint Broker

Andy Thacker/Guy McDougall
Tel: +44 (0)20 3657 0050

Flagstaff Communications and Investor Communications

Tim Thompson
Alison Allfrey
Fergus Mellon

[email protected]

Tel: +44 (0)207 129 1474

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Drill Hole Details - Pepas prospect 2022/2026 Programme*

*Coordinates WGS84, UTM Zone 18

About Orosur Mining Inc.

Orosur Mining Inc. (TSXV: OMI; AIM: OMI) is a minerals explorer and developer currently operating in Colombia and Argentina.

Qualified Persons Statement

The information in this news release was compiled, reviewed, verified and approved by Mr. Brad George, BSc Hons (Geology and Geophysics), MBA, Member of the Australian Institute of Geoscientists (MAIG), CEO of Orosur Mining Inc. and a qualified person as defined by National Instrument 43-101.

Orosur Mining Inc. staff follow standard operating and quality assurance procedures to ensure that sampling techniques and sample results meet international reporting standards.

Drill core is split in half over widths that vary between 0.3m and 2m, depending upon the geological domain. One half is kept on site in the Minera Anzá core storage facility in the case of the Anza Project, or on site in temporary racks in the case of the El Pantano Project, with the other sent for assay.

Industry standard QAQC protocols are put in place with approximately 10% of total submitted samples being blanks, repeats or Certified Reference Materials (CRMs).

Samples for holes PEP-001 to PEP-011 were sent to the Medellin preparation facility of ALS Colombia Ltd, and then to the ISO 9001 certified ALS Chemex laboratory in Lima, Peru.

Samples from PEP-012 onwards are sent to Medellin laboratory of Actlabs for preparation and fire assay, with some sample then sent to the Canadian Actlabs facility for multi element assay

Samples from the EL Pantano project are sent to the preparation facility and fire assay laboratory of Alex Stewart Laboratories in Perito Moreno to be assayed for gold.  Pulps are then sent to the larger Alex Stewart facility in Mendoza for multi-element analysis.

30 gram nominal weight samples are then subject to fire assay and AAS analysis for gold with gravimetric re-finish for overlimit assays of >5 g/t.  ICP-MS Ultra-Trace level multi-element four-acid digest analyses may also undertaken for such elements as silver, copper, lead and zinc, etc.

Gold intersections are reported using a lower cut-off of 0.3g/t Au over 3m.

Intersections are quoted as downhole thicknesses.  True thicknesses are unknown.

Forward Looking Statements

All statements, other than statements of historical fact, contained in this news release constitute "forward looking statements" within the meaning of applicable securities laws, including but not limited to the "safe harbour" provisions of the United States Private Securities Litigation Reform Act of 1995 and are based on expectations estimates and projections as of the date of this news release.

Forward-looking statements include, without limitation, the continuing focus on the Pepas prospect, the exploration plans in Colombia and the funding of those plans, and other events or conditions that may occur in the future. There can be no assurance that such statements will prove to be accurate. Actual results and future events could differ materially from those anticipated in such forward-looking statements. Such statements are subject to significant risks and uncertainties including, but not limited to, those described in the Section "Risks Factors" of the Company's MD&A for the year ended May 31, 2025. The Company's continuance as a going concern is dependent upon its ability to obtain adequate financing. This material uncertainty may cast significant doubt upon the Company's ability to realize its assets and discharge its liabilities in the normal course of business and accordingly the appropriateness of the use of accounting principles applicable to a going concern. The Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events and such forward-looking statements, except to the extent required by applicable law.