Positive Assay Results From Sampling & Field Campaign At Winston Gold-Silver Project

VANCOUVER - Rio Grande Resources Ltd. reported on the geological mapping and sampling program conducted at the Winston project in the Black Range of Sierra County, New Mexico. The program focused on the Paymaster Fault Corridor and identified several new mineralized veins and confirmed high-grade gold and silver mineralization across multiple vein systems and returning assays including highlights of 66.2 g/t gold and 830 g/t silver. The field campaign conducted from March 24-28, 2025, collected 57 samples and provided the Company geological insights and increased understanding of the high-grade epithermal vein system. These results serve to reinforce the project's exploration potential and indicate that a large, multi-phase hydrothermal system is present.

Jason Barnard, President and CEO, said, "These results underscore the high-grade potential of the Winston project, with gold values up to 66.2 g/t and silver up to 830 g/t. The discovery of new mineralized veins, combined with historic high-grade production from the Ivanhoe, Emporia, and Little Granite mines, reinforces our confidence in the district's potential. We are particularly encouraged by the copper-rich mineralization which adds another dimension to the project's value. These encouraging results continue to expand our knowledge base and further support the district-scale potential we are unlocking at the Winston Project. We look forward to continuing our exploration efforts on the property."