Rio Grande Resources Advances Winston Gold-Silver Project with Second Phase of Field Sampling and Mapping in Support of Phase 1 Drill Program

About this update from Rio Grande Resources Ltd

VANCOUVER, BC / ACCESS Newswire / May 6, 2026 / Rio Grande Resources Ltd. (CSE:RGR)(OTCQB:RGRLF) ("Rio Grande" or "RIO" the "Company"), is pleased to announce a second phase of field sampling and mapping in support of planning efforts for its upcoming Phase 1 drill program at the Winston Gold-Silver Project ("Winston" or the "Project"), located in the Black Range Mountains of Sierra County, New Mexico. The field program is being carried out by Dahrouge Geological Consulting USA Ltd. ("Dahrouge") and is expected to include approximately seven days of detailed structural mapping and surface sampling during the second week of May 2026. The upcoming fieldwork represents the next step in a systematic exploration approach following the Company's recent high-grade surface sampling results, which returned up to 41.2 g/t gold and 1,435 g/t silver from the Poverty Creek area (see news release February 19, 2026), as well as the completion of an airborne magnetic and radiometric survey that identified key structural corridors and zones of potential hydrothermal alteration across the property. The program is designed to integrate and ground-truth these datasets through detailed structural mapping and systematic sampling, with the objective of refining and prioritizing high-confidence drill targets for the Phase 1 Drill Program. Field Program Focus and ObjectivesThe field program will focus on the Poverty Creek area, the Ivanhoe and Emporia patented claims, and additional target areas identified through interpretation of the recently completed airborne geophysical survey (see Figure 1). These areas were selected to follow up on previously reported high-grade surface sampling results and geophysical responses interpreted to reflect structural corridors and potential zones of hydrothermal alteration. Detailed structural mapping of vein orientations, fault systems, and alteration zones will be carried out alongside systematic sampling of in situ vein exposures. Figure 1. Priority field target areas at the Winston Project, including Poverty Creek, Ivanhoe, and Emporia, identified through integration of surface sampling results and interpretation of airborne magnetic and radiometric data Jason Barnard, Rio Grande's CEO commented: "This next phase of fieldwork is a key step in advancing the Winston Proj...

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