Mr. Louis Castro reports

OROSUR MINING INC ANNOUNCES RESULTS FOR FIRST QUARTER ENDED AUGUST 31, 2023

Orosur Mining Inc. has released its unaudited results for the quarter ended Aug. 31, 2023. All dollar figures are stated in US$ unless otherwise noted. The unaudited condensed interim financial statements of the Company for the quarter ended August 31, 2023 and the related management's discussion and analysis ("MD&A") have been filed and are available for review on the SEDAR+ website at www.sedarplus.ca. The financial statements and the MD&A are also available on the Company's website at www.orosur.ca.

A link to the PDF version of the financial statements is available here: http://www.rns-pdf.londonstockexchange.com/rns/6121R_2-2023-10-27.pdf

A link to the PDF version of the MD&A is available here: http://www.rns-pdf.londonstockexchange.com/rns/6121R_1-2023-10-27.pdf

HIGHLIGHTSIn Colombia, negotiations continued with Monte Aguila on the shareholders agreement which will govern the new mining company to be owned 51% by Monte Agulia and 49% by Orosur. These discussions have continued post the period end. Whilst exploration activities have been wound back, some mapping and surface sampling has been carried out; a variety of licence processes, such as the integration of smaller licences have been advanced; and Monte Aguila has continued to fund the promotion of relationships with local community groups to strengthen the social licence to operate the Project. In Brazil, on July 5, 2023, the Company announced that given the success of the regional stream sediment program performed across the Company's Ariquemes district, it had decided to move to the next phase which has targeted two prospects at Oriente Novo (in the east of the Company's tenements) and at Paraiso in the west and to the north of the Bom Futuro tin mine. Sampling was performed during July and August and assays are expected imminently. In Argentina, on May 4, 2023 the Company announced that mapping and ground magnetic surveys at El Pantano had identified a major NW-SE structural corridor over 20km long and 5km wide, with large areas of silicification, alteration and geochemical anomalism over extensive areas. Mapping to the north of the main structure has so far identified over 70 quartz veins over an area in excess of 20km2, with textures indicative of cooler temperatures, fully consistent with the model of a very large low-sulphidation epithermal system. Mapping of this vein field continued until the commencement of the winter recess in early June. Soil sampling assay results were received and continued to add weight to the geological model with extended anomalism in gold and key pathfinder elements. Sampling and ground magnetic surveys recommenced after the winter recess in September with the plan of completing coverage of the highest priority parts of the project before the end of the year. In Uruguay the Company's wholly owned subsidiary, Loryser, continued to focus its activities on the final stages of the Creditors Agreement. In line with the Creditors Agreement, Loryser has sold all of its assets. It has paid for the settlements with all of its former employees; it has finalised the reclamation and remediation works on the tailings dam and has successfully concluded a one-year post-closure control phase. Loryser is well advanced in distributing the proceeds to Loryser's trade creditors in accordance with the Creditors' Agreement, via a court approved paying agent. Post the period end, on October 16,2023, the Company announced that it had signed a joint venture agreement over four licences in the Nigerian lithium belt.The Company, via a new 100% owned UK subsidiary, Lithium West Limited ("Lithium West"), may earn up to 70% equity in the project in two phases: Phase 1 - Lithium West can earn 51% equity in the project by spending a total of US$3m over a maximum of three years. Phase 2 - Lithium West can earn an additional 19% equity in the project, up to a total of 70%, by spending an additional US$2m over a maximum of two years. Other prospective areas are currently being examined and it is possible that additional licences may be added to the project in the near term.

Financial and CorporateThe unaudited condensed interim consolidated financial statements have been prepared on a going concern basis under the historical cost method except for certain financial assets and liabilities which are accounted for as Assets and Liabilities held for sale (at the lower of book value or fair value) and Profit and Loss from discontinued operations. This accounting treatment has been applied to the activities in Uruguay and Chile. On August 31, 2023, the Company had a cash balance of $3,186,000 (May 31, 2023: $3,748,000). As at the date of this announcement the Company had a cash balance of $2,350,000.Louis Castro, Executive Chairman of Orosur said:

"This has been a very busy progressive first quarter for the Company, with positive advances across all our portfolio. We are particularly delighted, post period, to add a high quality Lithium asset in Nigeria with an in situ team, which will allow us to focus on both our South American activities and on our new asset. "

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

Orosur Mining IncLouis Castro, Chairman, Brad George, CEO info@orosur.caTel: +1 (778) 373-0100

SP Angel Corporate Finance LLP - Nomad & BrokerJeff Keating / Kasia BrzozowskaTel: +44 (0) 20 3 470 0470

Turner Pope Investments (TPI) Ltd - JointBrokerAndy Thacker/James PopeTel: +44 (0)20 3657 0050

Flagstaff Communications Tim ThompsonMark EdwardsFergus Mellonorosur@flagstaffcomms.com 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.

About Orosur Mining Inc.

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

We seek Safe Harbor.