Orosur Mining develops El Pantano Project

Drilling identifies major epithermal gold/silver system. NI 43-101 Technical Report completed and filed. JV obligations met, project now owned 100%.

Next phase of work being planned. LONDON, UK / ACCESS Newswire / July 22, 2026 / Orosur Mining Inc. (" Orosur " or the " Company ") (TSXV:OMI)(AIM:OMI)(OTC PINK:OROXF) , is pleased to announce an update on the Company's exploration project at El Pantano in Argentina ("El Pantano" or the "Project"). El Pantano - Argentina The El Pantano project is an early-stage gold/silver exploration project in Santa Cruz province, southern Argentina.

The Project comprises approximately 560km 2 of contiguous granted licences in the prolific Deseado Massif of Santa Cruz Province, roughly 45km from Anglo Gold's Cerro Vanguardia mining camp and 100km SE of Newmont Mining's giant Cerro Negro mine. Figure 1. Project Location Figure 2.

Licence Package El Pantano was subject to an Exploration & Joint Venture agreement ("JV Agreement") with private Argentinean company Deseado Dorado S.A.S and its shareholders ("Deseado"), the details of which were announced on February 15 th , 2022. The JV Agreement required exploration expenditure of US$3m over 5 years from February 14 th , 2022, in two phases to earn 100% ownership of the Project. The Company completed the first phase of the JV Agreement, having invested US$1m over three years as announced on February 17 th , 2025.

With the recently completed drilling program, the Company has now completed the Phase 2 commitments of US$2m ahead of the required deadline and, as such, has exercised its option to retain 100% ownership of the Project. As part of the Phase 2 obligations, the Company has granted to the original vendors a 2% NSR royalty on future production, 1% of which the Company may purchase for US$1m at its discretion. Exploration Work While displaying positive surface geology, the Project had seen little historical modern exploration, apart fro