Vanguard Mining closes acquisition of Yuty Prometeo

Mr. David Greenway reports VANGUARD EXPANDS SOUTH AMERICAN URANIUM PORTFOLIO WITH CLOSING OF YUTY PROMETEO PROJECT IN PARAGUAY ADJACENT TO UEC Further to its definitive agreement dated June 17, 2025, and its letter of intent (LOI) dated April 8, 2025, Vanguard Mining Corp. has closed the acquisition of the Yuty Prometeo project in southeastern Paraguay. The four concessions -- including the three San Jose and one Yuty Uno concession -- collectively span approximately 90,000 hectares (222,395 acres) within the prolific Parana basin, one of South America's most promising uranium regions. The project area is located adjacent to Uranium Energy Corp.'s established Yuty deposit, which hosts an indicated resource of 8.96 million pounds of U3O8 (triuranium octoxide). David Greenway, chief executive officer of Vanguard Mining, commented: "Closing on the Yuty Prometeo concessions is a major milestone for Vanguard and underscores our commitment to building a dominant uranium portfolio in South America. Paraguay offers a unique combination of political stability, investor-friendly policies and untapped mineral potential that make it an ideal jurisdiction for long-term uranium exploration. With our ground positioned directly alongside UEC's established Yuty deposit, we see clear opportunity to apply modern exploration techniques across a historically prospective district. This acquisition not only strengthens our strategic footprint in the Parana basin but also advances Vanguard's broader mission to secure critical minerals that will drive the global clean energy transition." This acquisition follows company updates issued on April 17, 2025 (engagement of senior geologist Ariel Testi, CPG, to prepare an initial National Instrument 43-101 technical report on the Yuty Prometeo project), June 12, 2025 (initiation of a site visit, core review and data compilation in Paraguay to support that report), and June 17, 2025 (execution of a definitive share purchase agreement to acquire 100 per cent of 1302343 B.C. Ltd., which holds an 85-per-cent interest in Paraguay Uranium SA, owner of the four Yuty Prometeo concessions). About the Yuty Prometeo project The Yuty Prometeo consists of four concessions -- three San Jose concessions and one Prometeo concession -- covering a combined area of approximately 90,000 hectares (222,395 acres) within the uranium-rich Parana basin in southeastern Paraguay. The Prometeo concession spans approximately 27,666 hectares (68,368 acres) and is directly contiguous to Uranium Energy's Yuty project. Historical records reference 28 drill holes on the property, with uranium values ranging from 0.05 per cent to 0.10 per cent U3O8. Data from previous work by the Anschutz Corp. suggest that the Prometeo block lies on trend with Uranium Energy's adjacent Transandes block. The San Jose concessions encompass approximately 62,210 hectares (153,754 acres) across three contiguous claims situated along the Upper Permian-Carboniferous contact, approximately 100 kilometres northwest of Uranium Energy's Yuty project and 40 kilometres west of its Coronel Oviedo project. A radiometric car survey conducted over a 40-kilometre-by-10-kilometre area delineated significant uranium anomalies across the property. Collectively, these concessions represent a strategically positioned and highly prospective uranium exploration asset within one of South America's most promising uranium districts. About Uranium Energy's Yuty ISR (in situ recovery) project Uranium Energy's adjacent Yuty ISR project, covering approximately 117,359 hectares (290,000 acres) in southeastern Paraguay, hosts an indicated resource of 8,962,000 pounds and an inferred resource of 2,203,000 pounds U3O8, as disclosed in its July 1, 2022, technical report titled "Yuty Uranium Project Initial Assessment U.S. SEC Subpart 1300 Regulation SK Report, Paraguay, SA." The project has been identified as amenable to in situ recovery, the same extraction method Uranium Energy employs at its operations in Texas. Vanguard cautions that mineralization on adjacent properties is not necessarily indicative of mineralization on the company's own projects. On March 30, 2012, Uranium Energy acquired all outstanding shares of Cue Resources Ltd., securing a 100-per-cent undivided interest in the Yuty project. Resource estimates The current disclosed resource for Uranium Energy's Yuty project is 8,962,000 pounds of U3O8 indicated, and 2,203,000 pounds of U3O8 inferred, which has been finalized in a technical report prepared for Uranium Energy titled "Yuty Uranium Project Initial Assessment U.S. SEC Subpart 1300 Regulation SK Report, Paraguay, SA" dated July 1, 2022. Vanguard's management cautions that past results or discoveries on properties adjacent to Vanguard's projects may not be indicative of mineralization on the company's own properties. About Paraguay The Republic of Paraguay is an emerging mining jurisdiction in the heart of South America, bordered by Brazil, Argentina and Bolivia. Known for its political stability, low sovereign risk and investor-friendly regulatory environment, Paraguay offers a supportive framework for mineral exploration and development. The country has a democratic government, strong legal protections for foreign investment and a growing interest in unlocking its untapped mineral potential, particularly in uranium, rare earth elements and base metals. With abundant land, a relatively low population density and improving infrastructure, Paraguay is increasingly recognized as a geopolitically stable and strategically attractive destination for mining companies seeking long-term growth opportunities. Restricted share unit issuance The company announces it has granted 800,000 restricted share units (RSUs) to officers and directors of the company. The RSUs are valid for a term of one year and under the terms of the company's restricted share unit plan. All RSUs expire on Sept. 1, 2026. About Vanguard Mining Corp. Vanguard Mining is a Canadian mineral exploration company focused on the discovery and development of high-value strategic minerals. The company is currently advancing uranium exploration projects in the United States and Paraguay, with a focus on identifying and developing assets critical to the global energy transition. Vanguard is committed to responsible exploration and value creation through the acquisition and advancement of highly prospective uranium properties. Qualified person The scientific and technical information contained in this news release has been reviewed and approved by Lawrence Segerstrom, a consulting geologist, who is a qualified person as such term is defined under National Instrument 43-101, Standards of Disclosure for Mineral Projects. We seek Safe Harbor.