Orosur Mining's Aug. 31 cash balance at $3.9M (U.S.)

Mr. Louis Castro reports OROSUR MINING INC ANNOUNCES RESULTS FOR FIRST QUARTER ENDED AUGUST 31, 2025 Orosur Mining Inc. has released its audited results for the first quarter ended Aug. 31, 2025. The unaudited condensed interim financial statements of the company for the quarter ended Aug. 31, 2025, and the related management discussion and analysis have been filed 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 three months ended Aug. 31, 2025, include: Operational: In Colombia, on July 14, 2025, the company announced that it had taken the formal decision to begin a work program that, if successful, would allow a mineral resource estimate to be calculated at its Pepas gold prospect, within the Anza gold project area in Colombia. The decision was taken on the basis of external conceptual studies that suggest the location and physical characteristics of the gold mineralization so far defined at Pepas, in the context of record-high gold prices, may offer potential nearer-term production opportunities. The infill drilling program continued throughout the quarter and after the period-end and may be followed by a mineral resource estimate and an evaluation of the economics for production at Pepas. Thereafter, the company will return to wider exploration drilling, including at Apta. Earlier-stage exploration continues at the El Cedro prospect. The El Cedro prospect is a large gold porphyry system, located toward the south of the Anza project, on the same granted exploration licence as the Pepas and Apta deposits. The company recommenced a large ridge-and-spur soil sampling program at El Cedro that had been previously suspended due to seasonal rain and access issues. This program has continued beyond the period-end and is now 90 per cent complete. In Argentina, earlier this year, the company announced the successful completion of the first phase of the two-phase exploration joint venture over the El Pantano gold project in Santa Cruz province, Argentina. This milestone marked a significant step forward in the company's strategic development of the project. Having invested $1-million (U.S.) over three years, the company has now earned a direct 51-per-cent interest in the Argentine company, Deseado Dorado SAS, which owns the exploration licences that make up the project. The company has now moved into the second phase of the joint venture, which will see it move to 100-per-cent ownership of Deseado upon investment of an additional $2-million (U.S.) over two years. Upon such an outcome, the original vendors would then retain a residual 2-per-cent NSR (net smelter return) royalty, 1 per cent of which the company could repurchase at its election for $1-million (U.S.). A geophysical campaign was completed during the quarter with the objective of further refining targets at the project where drilling is expected to commence imminently with a 3,000-metre program of diamond drilling. In Nigeria, given the continued weakness in the price of lithium and in view of the company's need to prioritize the use of its capital and human resources, a decision has been taken to withdraw from the project, which should happen over the next few weeks. The investment in Nigeria was fully impaired in the company's financial statements as at May 31, 2025. Financial: On Aug. 31, 2025, the company had a cash balance of $3,906,000 (U.S.) (May 31, 2025: $4,877,000 (U.S.)). As at the date of this MD&A and including the funds raised in the private placement (detailed below), the company had a cash balance of $17.2-million (U.S.). After period-end, on Sept. 18, 2025, the company announced an upsized brokered private placement to raise gross proceeds of up to $20-million (Canadian) through the issue of up to 58,823,530 common shares at a price of 34 Canadian cents per common share. The placing, which was oversubscribed, was completed on Oct. 2, 2025, and raised $20-million (Canadian). No warrants were issued in connection with the placing. Outlook and strategy The company will focus its investment in Colombia and Argentina whilst also looking for new opportunities in South America. In Colombia, within the Anza project, the company is looking to complete its infill drilling program at Pepas, which would allow maiden resource estimate to be completed at Pepas. Thereafter, the company will continue to investigate the possibility of a resource estimate at its Apta prospect whilst it refines its geological models around Pepas to identify possible target areas. At El Cedro, geological mapping and sampling are nearing completion. Historical geophysics is being reprocessed and, if warranted, new geophysical data will be acquired. In Argentina, the company will shortly commence a 3,000-metre drilling program at the El Pantano project. About Orosur Mining Inc. Orosur Mining is a minerals explorer and developer currently 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 National Instrument 43-101. We seek Safe Harbor.