Rio Grande Resources Reports Gold up to 41.2 g/t and Silver up to 1,435 g/t at Its Winston Project, New Mexico

Executive Summary

• Rio Grande Resources reported high‑grade gold (up to 41.2 g/t Au) and silver (up to 1,435 g/t Ag) from a newly identified, previously unsampled “Poverty Creek Trend” within the Winston Gold‑Silver Project in New Mexico.
• The December 2025 reconnaissance program collected 72 samples (including channel and rock‑chip work), defining an approximately 2 km north‑south mineralized corridor that extends beyond historic mine zones (Ivanhoe, Emporia, Little Granite).
• The company plans to refine structural targets and move toward drill permitting and systematic drilling to test the expanded corridor.

Key Details

• Sampling Overview: 72 samples – 11 channel samples from in‑situ veins and 39 rock‑chip samples from vein outcrops, subcrops, historic workings.
• Top Assay Highlights:
• WIN‑120725‑16 – 29.5 g/t Au, 1,435 g/t Ag
• WIN‑120725‑17 – 6.3 g/t Au, 605 g/t Ag
• WIN‑120725‑18 – 4.34 g/t Au, 303 g/t Ag
• 25‑WIN‑G‑CH – 9.87 g/t Au, 291 g/t Ag
• Poverty Creek Trend: Newly identified NE‑SW striking vein system in the northern claim block; first‑pass sampling (8 rock chips + 1 float) confirmed along‑strike continuity of high‑grade mineralization.
• Structural Extent: Approx. 2.0 km strike length of continuous mineralized corridor from historic Ivanhoe/Emporia zones northward to Poverty Creek Trend.
• Additional Corridor: Channels C, G, and K in the northwestern claim block returned elevated Au‑Ag values, indicating a second structurally controlled vein system open for further evaluation.
• Historic Context: High‑grade silver (up to 1,435 g/t Ag) associated with historic mine workings reinforces district fertility.
• Future Work: Continue surface sampling and structural mapping; incorporate additional exploration methods; prioritize targets for drill permitting and systematic drilling.
• Qualified Person: Jacob Anderson, CPG, MAusIMM, reviewed and approved technical information under NI 43‑101.

Notable Quotes

“The December 2025 sampling program… further supports the Company’s interpretation of an approximately 2.0 km north‑south, structurally controlled mineralized corridor across the Winston claim block…” – Jason Barnard, President & CEO

“High‑grade mineralization is occurring in several structurally distinct zones, suggesting a broad, long‑lived hydrothermal system… positions Winston as a highly compelling exploration asset.” – Jason Barnard