Successful Completion Of Sampling And Field Campaign At Winston Gold-Silver Project

VANCOUVER - Rio Grande Resources Ltd. has successfully completed its exploration and sampling program conducted at the Winston Gold-Silver Project located the Black Range Mountains of Sierra County, New Mexico. The recent field campaign collected 57 samples to be analyzed, and further, provides promising geological insights to advance the Company's understanding of the high-grade epithermal vein system.

Mineralized shoots were identified along bends in vein strike and are associated with ginguro banded vein phases containing dark gray sulphosalts and chalcopyrite, indicative of high-grade precious metal potential. This mineralization style is shown to be associated with economic gold and silver grades, particularly in epithermal or transitional vein systems. The presence of sulphosalts strongly suggests significant silver enrichment, while ginguro textures point to episodic high-grade deposition.

Surface mapping confirmed continuous vein strike lengths of several hundred meters to over 1 kilometer, with evidence that the precious metal horizon remains intact at depth despite post-mineral fault offsets. A 3D geological model is under development, integrating quartz textures, mineral paragenesis, alteration, and geochemistry to target the precious metal horizon of the vein system.

Jason Barnard, President and CEO, said, "The findings from our March field program at the Winston Project underscore the exceptional potential of this district. The continuity of high-grade vein structures, combined with the geological indicators of preserved mineralization at depth, reinforces our confidence in the Project's ability to host significant gold-silver resources. Our team is now focused on integrating these results into a robust 3D model to guide our next phase of exploration, including the prospect of future targeted drilling. With gold and silver markets remaining strong, we are committed to advancing Winston strategically and efficiently to unlock value for our shareholders."