Mr. Benjamin Hill reports

RAIN CITY RESOURCES INC. ANNOUNCES STRATEGIC ALLIANCE WITH FRAUNHOFER CHILE TO ADVANCE ITS NEXT-GENERATION DLE PLATFORM ACROSS THE LITHIUM TRIANGLE

Rain City Resources Inc. has entered into a strategic collaboration with Fundacion Fraunhofer Chile Research, part of the broader Fraunhofer network, one of the world's most respected applied research platforms, and a recognized benchmark in industrial innovation, engineering and technology validation.

The agreement materially strengthens Rain's technical, metallurgical and commercial platform across the Lithium Triangle, with particular focus on Argentina, Bolivia and Chile, and supports the advancement of the company's next-generation direct lithium extraction technology designed for very low or near-zero water consumption, improved process efficiency, and broader deployment across complex brine environments.

Under the memorandum of agreement, Rain and Fraunhofer Chile will establish a framework for collaboration in technology validation, process optimization, pilot development, renewable energy integration, circular economy solutions, sustainability assessment, and broader project execution related to advanced lithium extraction and processing. The collaboration is intended to support Rain's DLE platform across diverse brine chemistries and operating conditions while reinforcing and elevating the technical, institutional and commercial relationships the company has already been advancing in the region.

For Rain, the significance of this alliance extends beyond institutional visibility. Fraunhofer's applied research model, engineering depth and international industrial network are expected to strengthen technical derisking, metallurgical validation, pilot-stage preparation and commercialization pathways. The MoA also provides for project-specific agreements, feasibility studies, technical exchanges, co-ordinated oversight and international funding initiatives tied to future collaborative programs.

The agreement further contemplates multijurisdictional feasibility studies, pilot installations, prototype testing and commercial demonstration projects in the Lithium Triangle, together with an international joint steering committee, to oversee implementation, strategic alignment and disciplined execution. The parties have also committed to move toward binding project agreements and concrete collaborative programs within a defined postsigning implementation period.

Benjamin Hill, chief executive officer of Rain, commented: "Fraunhofer Chile brings a globally respected applied research and engineering platform to Rain at an important stage in the advancement of our next-generation DLE technology. This alliance strengthens our ability to validate performance, advance pilot readiness and execute with greater technical depth across the Lithium Triangle."

Sebastian Quinones, head of Rain LatAm and board adviser of Rain, stated: "This is a strategically important alliance from a technical, metallurgical and commercial standpoint, particularly in a region where brine complexity, operating conditions and regulatory frameworks vary significantly. It not only supports the advancement of our new DLE platform with ion source, but also deepens the partnerships already in motion and strengthens Rain's position in Argentina, Bolivia and Chile."

Rain believes this collaboration can contribute meaningfully to the advancement of more efficient, scalable and sustainable lithium development in South America, while strengthening the company's engagement with producers, institutions, strategic counterparties and downstream participants across the battery material value chain.

About Rain City Resources Inc.

Rain City is a Canadian public company focused on advancing next-generation direct lithium extraction technologies and building strategic development pathways across the Lithium Triangle and other high-potential jurisdictions. The company is committed to supporting more efficient, scalable and sustainable lithium production through technical innovation, disciplined execution and regional partnerships.

We seek Safe Harbor.