Mr. Louis Castro reports

OROSUR MINING INC. - FULL YEAR 2026 RESULTS

Orosur Mining Inc. has released its audited results for the fiscal year ended May 31, 2026. All dollar figures are stated in thousands of U.S. dollars unless otherwise noted. The audited financial statements of the company for the year ended May 31, 2026; the related management discussion and analysis (MD&A); and Form 52-109FV1 were filed on Friday, Sept. 25, 2026, and are available for review on SEDAR+. The financial statements and the MD&A are also available on the company's website.

Highlights

Highlights for the year ended May 31, 2026, include the following.

Operational

In Colombia, at the Anza project, the company completed its infill drilling program at Pepas and has declared a maiden resource estimate of 219,000 ounces of gold. The company is now drilling in the greater Pepas area with a view to refining its geological model in the area and identifying potential future deposits. After the period-end, the company announced that it had identified a second area of mineralization approximately 100 metres to the west of Pepas.

In Apta, located in the centre of the company's licence area, drilling commenced after the year-end to gain a better understanding of the geological controls ahead of a potential resource estimate later this year. The results from this recent post-year-end drilling indicate more extensive mineralization at Apta, which has substantially enhanced the prospectivity of Apta with three areas of potential requiring follow-up.

To the south of Apta, geological mapping and sampling have been completed at El Cedro and the company announced that new mapping and sampling had commenced after the year-end at a new second porphyry identified to the south of El Cedro. New airborne geophysics was flown to establish drill targets at both El Cedro and in the new second porphyry identified to the south of El Cedro. Drilling commenced in late August, 2026. Partial results from first hole at El Cedro show gold mineralization from surface with 61.35 metres at 0.93 gram per tonne gold (from surface), including 42.15 metres at 1.02 grams per tonne gold from 19 metres. Drilling is continuing to a planned depth of 500 metres.

In Argentina, the company's first drilling program for a total of approximately 5,500 metres (24 diamond drill holes) had been completed by the end of March, 2026, at El Pantano. Drill holes were spread across the eastern and western extremes of the main rift-related epithermal system, with several sections being completed to facilitate an assessment of lateral and vertical variations in geochemistry and structures.

On July 22, 2026, after the year-end, the company announced that the drilling campaign had identified a major gold/silver epithermal system and that a National Instrument 34-101 report on the El Pantano project had been prepared and filed on SEDAR+.

The company also announced on that day that, with the recently completed drilling program, the company had satisfied all commitments under the joint venture agreement with its partner Deseado ahead of the required deadline and, as such, had exercised its option to obtain 100-per-cent ownership of the El Pantano project. As set out in the joint venture agreement, Deseado has been granted a residual 2-per-cent net smelter royalty on the El Pantano project, of which 1 per cent can be bought by the company for $1-million.

Interpretation of all new and historical data will inform a next phase of fieldwork, which may be commissioned later in the year, potentially ahead of a second drill program at the project.

Financial and corporate

On Sept. 18, 2025, the company announced an upsized brokered private placement (the placing) to raise gross proceeds of $20-million (Canadian), which included the full exercise of the broker's option, through the issue of 58,823,530 common shares at a price of 34 Canadian cents per common share. No warrants were issued in connection with the placing. The placing closed successfully on Oct. 2, 2025.

At the company's annual general meeting, held on Dec. 17, 2025, all resolutions put to shareholders were duly passed.

On May 31, 2026, the company had a cash balance of $9,954,000 (May 31, 2025: $4,877,000). As at the date of this press release, the company had a cash balance of $7.35-million.

After year-end, on Sept. 22, 2026, the company announced a brokered private placement to raise gross proceeds of up to $14-million (Canadian) through the issue of up to 43.75 million units at a price of 32 Canadian cents per unit. Each warrant can be exercised for one common share at an exercisable price of 32 U.S. cents for a period of two years from the date of issuance save for the first 61 days after issuance. The placement is expected to close on or about Oct. 6, 2026.

The audited consolidated financial statements have been prepared on a going-concern basis under the historical cost method, except for items measured at fair value and assets and liabilities related to discontinued operations, which are measured at the lower of cost or recoverable amount. This accounting treatment has been applied to the activities in Uruguay and Chile.

About Orosur Mining Inc.

Orosur Mining is a minerals explorer and developer operating in Colombia and Argentina.

Qualified person statement

The information in this news release was compiled, reviewed, verified and approved by Brad George, BSc (honours) (geology and geophysics), MBA, member of the Australian Institute of Geoscientists (MAIG), chief executive officer of Orosur Mining and a qualified person as defined by NI 43-101.

Orosur Mining 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 0.3 metre and two metres, depending upon the geological domain. One-half is kept on site in the Minera Anza 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 quality assurance/quality control protocols are put in place, with approximately 10 per cent 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 and MAP-106 onward are sent to Medellin laboratory of Actlabs for preparation and fire assay, with some samples then sent to the Canadian Actlabs facility for multielement assay. Thirty-gram nominal weight samples are then subject to fire assay and AAS analysis for gold with gravimetric refinish for overlimit assays of greater than five grams per tonne. ICP-MS ultratrace-level, multielement, four-acid-digest analyses may also undertaken for such elements as silver, copper, lead and zinc. Gold intersections are reported using a lower cut-off of 0.3 gram per tonne gold over three metres. Intersections are quoted as downhole thicknesses. True thicknesses are unknown.