CORRECTION FROM SOURCE: Rio Grande Resources Announces Results from its Airborne Survey at Winston Gold/Silver Project, New Mexico and Announces New President

About this update from Rio Grande Resources Ltd

This Press Release includes images that were missing from the previous version. VANCOUVER, BC / ACCESS Newswire / April 30, 2026 / Rio Grande Resources Ltd. (CSE:RGR)(OTCQB:RGRLF) ("Rio Grande" or "RIO" the "Company"), is pleased to announce results from its recently completed airborne magnetic and radiometric geophysical surveys conducted at its Winston Gold-Silver Project (the "Winston Project" or the "Project") located in the Black Range Mountains of Sierra County, New Mexico. The survey grid and flight-line layout (see Figure 1) was conducted by Precision GeoSurveys Inc., ("Precision") and included 384 line km of survey lines at 50 m spacing (see table 1). It identified possible structural trends and areas of potential hydrothermal alteration that may suggest zones of mineralization. The results are being used by Rio Grande to refine surface sampling targets for an upcoming field program, as well as drill targets currently in the planning stage. Figure 1. Winston survey block grid showing survey flight lines and tie lines. The magnetic survey suggests both shallow, near-surface structures and deeper alteration zones that require follow-up evaluation. The radiometric data, when used in conjunction with existing field observations and historical mining data, suggest areas of potential alteration that have not yet been tested by modern sub-surface exploration. Ratio maps (see figure 2), including the uranium-to-thorium (U/Th) ratio, highlight areas that may indicate hydrothermal alteration when coupled with additional exploration data. Survey Highlights include: Figure 2. Map of the total magnetic intensity throughout the Winston claim block. The magnetic survey conducted by Precision suggests both shallow, near-surface structures and deeper alteration zones that require follow-up evaluation "The results from our airborne survey provide an important new layer of data as we continue to refine our understanding of the Winston Project," said Jason Barnard, CEO of Rio Grande Resources. "The identification of possible structural trends and areas of potential alteration supports our ongoing work to prioritize targets and advance toward drill testing." "I am pleased to transition the Interim President role to Christina Barnard on a permanent basis." adds Mr. Barnard, &quot...

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