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Orosur Mining Inc Announces Maiden Mineral Resource Estimate at Pepas

Orosur Mining Inc

Tue, February 10, 2026 at 4:00 PM GMT+9 15 min read

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Maiden Mineral Resource Estimate at Pepas, Anzá Project, Colombia

Maiden Mineral Resource Estimate at Pepas of 1.14 Mt at 5.46 g/t Au in Indicated classification for 201,000 ounces of contained gold.
*
Additional Inferred Mineral Resource of 0.19 Mt at 2.99 g/t Au for 18,000 ounces of contained gold.

LONDON, UK / ACCESS Newswire / February 10, 2026 / Orosur Mining Inc. (“Orosur” or the “Company”) (TSXV:OMI)(AIM:OMI), is pleased to announce the completion of a maiden Mineral Resource estimate (“MRE”) for the Pepas deposit, at the Company’s Anzá Project in Colombia.

The Anzá Project comprises a number of granted exploration titles and applications totaling roughly 330 km2 within the Mid-Cauca gold belt, west of the city of Medellín, Antioquia state, Colombia. Orosur owns 100% of these titles and applications through two Colombian wholly owned subsidiary companies, Minera Anzá, and Minera Monte Águila.

The Pepas gold deposit is located in the northern part of the Anzá project area and was discovered by the Company’s previous JV partners in early 2022, but not advanced. When the Company reassumed 100% ownership of Anzá in November 2024, it commenced drilling immediately at Pepas with positive results, leading to the decision in June 2025 to focus drilling entirely at Pepas to allow estimation of a Mineral Resource as quickly as possible.

Orosur CEO Brad George commented:
“The Company’s decision to focus its efforts on moving the Pepas deposit toward an MRE has been justified with this result. We will now immediately move Pepas into the economic study and permitting stage, while at the same time expanding our exploration effort to begin testing other prospects within the Anzá project.”

Figure 1. Anzá Project

Pepas Mineral Resource Estimate
A Mineral Resource Estimate (“MRE”) has been completed for the Pepas deposit by international mineral consulting firm, Bara Consulting Limited, with an effective date of January 16, 2026. The MRE was prepared in accordance with the 2019 Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Estimation of Mineral Resources & Mineral Reserves Best Practice Guidelines and 2014 CIM Definition Standards for Mineral Resources & Mineral Reserves and disclosed to National Instrument 43-101 (“NI 43-101”). Details of the MRE evaluation will be provided in a Technical Report prepared in accordance with NI 43-101 filed under the Company’s SEDAR profile within 45 days of this release.

The Pepas Mineral Resource comprises an estimated 1.14 million tonnes at a grade of 5.46 g/t gold for 201,000 ounces of gold in the Indicated Mineral Resource category and 0.19 million tonnes at a grade of 2.99 g/t gold for 19,000 ounces of gold in the Inferred Mineral Resource category and assumes extraction via an open pit mining scenario. Mineral Resources are classified as Indicated and Inferred based on CIM Definition Standards.

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The resource is entirely contained within an open pit shell, down to a vertical depth of approximately 100 meters, with mineralization starting at surface. The MRE and pit shell have been generated using a gold price of US$3,000/oz and a reporting cut-off grade of 0.92 g/t Au.

Table 1. Resource table, Pepas

1. Tonnages are rounded to the nearest 10,000t to reflect this as an estimate.
2. Metal content is rounded to the nearest 1,000ozs to reflect this as an estimate.
3. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability.
4. Mineral Resources are reported above a cut-off grade of 0.92 g/t Au within a conceptual pit shell generated in support of reasonable prospects of eventual economic extraction (RPEEE) as per CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines prepared by the CIM Mineral Resource and Mineral Reserve Committee and adopted by the CIM Council on November 29, 2019, which incorporates gold price, payability, recovery, throughput, mining costs, processing costs, and transport cost assumptions considered reasonable at a conceptual level.
5. The conceptual pit shell has been generated using the following assumptions and parameters: throughput of 250 ktpa, gold price (USD$3,000), payability (99.5%), Au recovery (88.75%), ROM transport cost (USD$2.50/t), processing costs (USD$60/t), G&A cost (USD$10/t), and mining costs (USD$2.05/t, USD$3.40/t, and USD$3.50/t for oxide, transitional, and fresh material respectively).
6. The Qualified Person (QP) is not aware of any legal, permitting, title, taxation, socio-economic, marketing, political, environmental, or other risk factors that might materially affect the estimate of Mineral Resources.

Figure 2. Grade tonnage curve

Figure 3. Plan of holes, block model, and pit shell

Figure 4. Example block model cross section and pit shell above 0.92 g/t Au cutoff

Figure 5. Block model cross section, resource classification

Figure 6. Isometric view

MRE Parameters and Methodology
The Mineral Resource estimate is based on diamond drill hole data contained within a database as of January 16, 2026. The dataset includes 79 diamond drill holes totaling 10,592.10 meters of drilling. The current drill hole spacing ranges from approximately 15m to 30m over the deposit.

Mineral Resource domains were created within a NW-SE fault-bounded block approximately 200m (strike length) by 100m (width), reaching a maximum depth of 100m, where gold is hosted within a broadly NNW-SSE to NNE-SSW trending sinuous zone of quartz veining. Bounding structures have been modeled and are broadly coincident with the extent of silicic/sericitic alteration, defining mineralized zones within a NW-oriented lozenge, supported by a nominal 0.15 g/t Au threshold. Two spatial grade domains (low grade and high grade—above 1.0 g/t Au) were modeled using implicit modeling in Leapfrog™ software, supported by statistical analysis, oriented broadly N-S with a subvertical dip. A small, near-surface domain hosted in colluvium was also modeled at a 0.5 g/t gold cutoff.

In addition to mineralized domains, bounding faults and weathering surfaces are modeled, constrained to topography, with a flagged block model into which gold grade is estimated. Parent cell dimensions of 10m x 10m x 5m were subdivided down to a minimum of 0.5m x 0.5m x 0.5m to accurately represent mineralized geometries. Gold assay data within mineralized domains were composited to 2m, with grade capping applied to mitigate extreme values. Statistical and geostatistical analyses (variography) assessed grade continuity. Density was assigned via Inverse Distance Weighting (IDW) from drill core samples. Grade estimation used Ordinary Kriging (OK) in three passes until all blocks were estimated. Validation included visual inspection, comparison of global means, volume checks, and swath plots.

The estimate meets the criteria for reasonable prospects of eventual economic extraction (RPEEE), reporting only material above a 0.92 g/t Au cutoff, based on a conceptual open pit optimization with parameters as above.

The classification of Mineral Resources is based on sufficient exploration, geological understanding, QA/QC controls, and geostatistical analysis, supporting confidence in the continuity of grade and geology. Indicated Mineral Resources are those with grade estimates captured in the first search pass (up to 30m range).

Orosur staff follow standard procedures to ensure sampling and data quality meet international standards. Drill core is split in half, with one half stored on site and the other sent for assay.

Samples from PEP001 to PEP011 (2022) were prepared at ALS Medellín, Colombia, and analyzed at ALS Lima, Peru, both ISO/IEC 17025:2017 accredited. Some samples were forwarded to other ALS labs in Canada, Laos, and South Africa. Samples from PEP012 to PEP074 (2024/2025) were analyzed at Actlabs Colombia S.A.S., certified to ISO 9001.

Samples were barcoded, logged, dried, crushed, and pulverized, then analyzed by fire assay with atomic absorption spectroscopy (AAS). Samples with high gold values were re-analyzed by gravimetric fire assay or Screen Fire Assay (SFA) as needed.

A QA/QC program includes blanks, certified reference materials, and duplicates at various stages to ensure data quality. The Qualified Person has reviewed all QA/QC data and considers the dataset acceptable for Mineral Resource evaluation.

Pepas and Anzá Project Geology
The Anzá Project is located in the Middle Cauca belt of Colombia, on the west side of the Romeral-Cauca fault system. The geology includes Upper Cretaceous to Paleocene mafic and intermediate volcanic rocks and sediments of the Western Cordillera, intruded by gabbro to quartz-diorite stocks. Miocene porphyritic intrusions of diorite to granodiorite are also present.

The Pepas deposit is in the northern part of the Anzá Project and is interpreted as an intermediate sulphidation epithermal gold system. Gold mineralization is hosted within volcaniclastic and epiclastic rocks of the Upper Cretaceous Barroso Formation.

The mineral resource occurs within a NW-trending fault zone called the Pepas fault zone, an antithetic fault relative to the NE-trending Aragón fault. The resource is bounded by two fault strands dipping in opposite directions, forming a fault-bounded lens or lozenge.

Within this zone, host rocks show strong silicification, quartz-sericite alteration, and steeply dipping quartz veins. Veining trends are mainly north to NNE, parallel to regional structures but oblique to bounding faults. Overprinting argillic alteration is variably pyritic but weakly anomalous in gold.

Veining is banded and sinuous, with thin sulphidic laminae, indicative of epithermal pulses. Sulfide content is low, mainly pyrite and sphalerite, with some galena and chalcopyrite. Gold grades are closely related to veining and sulfide abundance, especially low-iron sphalerite and pyrite.

Figure 7. Regional Geology, Anzá Project area.

For further information, visit www.orosur.ca, follow on X @orosurm, or 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
Jeff Keating / 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
Mark Edwards
[email protected]
Tel: +44 (0)207 129 1474

The information in this announcement is deemed by the Company to constitute inside information under the Market Abuse Regulations (EU) No. 596/2014 (“MAR”), incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon publication via the Regulatory Information Service (“RIS”), this inside information is considered public.

Neither TSX Venture Exchange nor its Regulation Services Provider accepts responsibility for the accuracy of this release.

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

Qualified Persons Statement
The Mineral Resource estimate and supporting technical information were prepared under the supervision of Mr. Galen White, BSc (Hons), FAusIMM, FGS, Principal Consultant at Bara Consulting Limited, in accordance with Canadian regulatory standards (NI 43-101). Mr. White is a Qualified Person (“QP”) and independent of the Company. Verification included a site visit in November 2025, geological review, drill hole inspection, data validation, and QA/QC review. Mr. White has approved this release.

A technical report on the Anzá Property, including Mineral Resource disclosure, will be filed on SEDAR+ at www.sedarplus.ca within the regulatory deadline.

Forward-Looking Statements
This release contains forward-looking statements regarding exploration, development, and other future events, which involve risks and uncertainties. Actual results may differ materially. The Company disclaims any obligation to update these statements except as required by law.