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Rio Grande Resources Announces the Commencement of its 2025 Exploration Program on its Winston Group of Gold and Silver Properties

Exploration Programs

VANCOUVER, British Columbia, March 17, 2025 – Rio Grande Resources Ltd. (CSE: RGR) (“Rio Grande” or “RIO” the “Company”), an emerging North American gold and silver exploration company, is pleased to announce an exploration and sample program will commence on Monday, March 24, 2025 at its Winston Group of Gold and Silver Properties (“Winston” or “The Winston Project”) located in the Black Range Mountains in the Chloride Mining District of Sierra County, New Mexico, USA. The initial phase of this program is strategically designed to refine targets for evaluation, to test new high-priority zones and will include systematic sampling for additional targets.

Jason Barnard, CEO of Rio Grande Resources, comments: “Rio.Grande.is.embarking.on.a.new. chapter.at.our.Winston.Project.at.an.exciting.time?.with.a.robust.and.bullish.gold―silver.market. providing.an.ideal.backdrop¡.Given.that.the.Winston.Project.hosts.several.past.and.present. silver.mines?.we.are.confident.that.this.exploration.program.will.identify.additional.promising. targets¡.We.are.sitting.on.a.district.hosting.several.past.and.present.gold.and.silver.mines?.and. we.believe.it.holds.tremendous.potential.for.significant.discoveries¡.Our.systematic.sampling. and.comprehensive.analysis.will.build.a.strong.foundation.for.future.drilling.and.bring.us.closer. to.realizing.the.property"s.full.potential?.with.our.team.dedicated.to.rapidly.advancing.the. Winston.Project.for.our.shareholders¡ƒ

The Winston Project encompasses over 3,000 acres and includes the historic Ivanhoe, Emporia, and Little Granite mines, with exploration being undertaken under the leadership of Dr. M. Feinstein, PhD, CPG. The Ivanhoe and Emporia consists of 2 patented lode claims, which were past producing goldsilver mines, under the same name. Discovered in the 1880s, the Ivanhoe features three shafts reaching a depth of 470 feet and multiple subterranean levels intermittently worked throughout its history. The Little Granite, consisting of 4 lode mine claims, has a main vein that has been traced for over 200 meters by past drilling and remains open along strike and at depth. Historic reports suggest the Little Granite Vein widens to approximately 3m (10ft) at depth. Mining in this area only ceased due to the decline in the price of silver and gold and not for a lack of significant mineralization.

The sampling program will include:

  • Infill areas with limited existing sampling data
  • Investigate and sample previously unknown historic diggings identified through LiDAR
  • Investigate extensions of vein trends in the northern portion of the property.

Figure 1. Area of Interest Highlighting Rio Grande’s Core North Land Holding Along the Paymaster Fault Zone Corridor

The program will focus on geological mapping and systematic sampling along a 3 KM area of interest along the Paymaster Fault zone (highlighted section in red circle in figure 1), a significant structural feature associated with historical gold-silver vein deposits. In late 2022, the Company expanded its land holdings by acquiring eight additional claims along the northern extension of the Paymaster Fault. Rio will also conduct additional exploration along a prospective mineralized footprint that extends 8-kilometers in strike length and ranges from 1 to 2 kilometers in width. Geological evidence suggests a low-to-intermediate sulfidation epithermal vein system, with high-grade gold and silver mineralization confirmed across the property. While previous exploration occurred primarily in the 1970s and 1980s, Rio intends to leverage modern exploration concepts and advanced technologies including high-resolution geophysics, geochemical analysis and systematic methodologies to define geometry, controls on mineralization to delineate potential ore zones.

All samples collected will be submitted to ALS Global Laboratories via their intake facility in Tucson, AZ, for gold analysis by Fire Assay and multi-element analysis by 4-acid digestion and ICP. Assays will be released in a future news release.

Leadership Updates

Rio Grande would like to announce that Raymond Strafehl has transitioned from his role as President and into the role as Vice President of Corporate Development. He will continue on the Board. Current CEO, Jason Barnard, will be acting as Interim President effective immediately until his successor is announced.

Equity Grant

Further, the Company announces that it has granted an aggregate 50,000 stock options to a consultant of the Company, exercisable at $.07and valid for a 3-year term. All stock options issued are subject to a statutory hold period of four months and one day and have been granted in accordance with the Company’s Omnibus Long-Term Incentive Plan dated December 20, 2024 and the policies of the Canadian Securities Exchange.

Qualified Person

Technical information in this news release has been reviewed and approved by Michael Feinstein, PhD, CPG, who is a Qualified Person as identified by Canadian National Instrument 43-101 Standards of Disclosure for Mineral Projects.

About Rio Grande Resources

Rio Grande Resources (CSE:RGR) is a burgeoning mineral exploration company focused on unlocking the high-grade gold and silver potential within its 3,000-acre drill-ready property in the Black Range of Sierra County, New Mexico. The company holds 100% interest in the Winston project group, which includes the 2 patented historic Ivanhoe & Emporia Claims, and Little Granite mines, all known for their past production of high-grade precious metals. Rio Grande Resources is led by a team of experienced professionals with expertise in mineral exploration and development, who are targeting large-scale precious metal discoveries within the property’s well-documented low-sulfidation epithermal setting. To view the company fact sheet and corporate presentation please visit our website at www.riogranderesources.ca

Contact and Information Company Jason Barnard, President & CEO and Director (604) 767-6598 [email protected] Investor Relations Contact:

Lucas A. Zimmerman & Ian Scargill MZ Group - MZ North America (262) 357-2918 [email protected] www.mzgroup.us Follow us or contact us on social media

X: @RioGrandeRGR LinkedIn: https://www.linkedin.com/company/rio-grande-resources-ltd/ Facebook: facebook.com/profile.php?id=61572800435230

Forward-Looking Statements

Except.for.the.statements.of.historical.fact.contained.herein?.the.information.presented.in.this.news. release.and.oral.statements.made.from.time.to.time.by.representatives.of.the.Company.are.or.may. constitute.»forward‗looking. statements‹ . as. such. term. is. used. in.applicable. United.States. and. Canadian. laws. and. including?. without. limitation?. within. the. meaning. of. the. Private. Securities. Litigation.Reform.Act.of.7❺❺❶?.for.which.the.Company.claims.the.protection.of.the.safe.harbor.for. forward. looking. statements¡. Such. forward‗looking. statements. and. forward‗looking. information. include?.but.are.not.limited.CSE.and.the.proposed.benefits.of.the.Arrangement¡.These.statements. relate.to.analyses.and.other.information.that.are.based.on.forecasts.of.future.results?.estimates.of. amounts.not.yet.determinable.and.assumptions.of.management¡.Any.other.statements.that.express. or. involve. discussions. with. respect. to. predictions?. expectations?. beliefs?. plans?. projections?. objectives?.assumptions.or.future.events.or.performance.(often?.but.not.always?.using.words.or. phrases.such.as.»expects‹ .or.»does.not.expect?‹ .»is.expected?‹ .»anticipates‹ .or.»does.not.anticipate?‹ . »plans?‹ .»estimates‹ .or.»intends?‹ .or.stating.that.certain.actions?.events.or.results.»may?‹ .»could?‹ . »would?‹ .»might‹ .or.»will‹ .be.taken?.occur.or.be.achieved).are.not.statements.of.historical.fact.and. should.be.viewed.as.forward‗looking.statements¡.Such.forward‗looking.statements.involve.known. and.unknown.risks?.uncertainties.and.other.factors.which.may.cause.the.actual.results?.performance. or.achievements.of.the.Company.to.be.materially.different.from.any.future.results?.performance.or. achievements.expressed.or.implied.by.such.forward‗looking.statements¡.Such.risks.and.other. factors.include?.among.others?.the.availability.of.capital.to.fund.programs.and.the.resulting.dilution. caused.by.the.raising.of.capital.through.the.sale.of.shares?.continuity.of.agreements.with.third.parties?. the.satisfaction.of.the.conditions.to.the.Arrangement?.risks.and.uncertainties.associated.with.the. environment.and.delays.in.obtaining.governmental.approvals?.permits.or.financing¡.Although.the. Company.has.attempted.to.identify.important.factors.that.could.cause.actual.actions?.events.or. results.to.differ.materially.from.those.described.in.forward‗looking.statements?.there.may.be.other. factors.that.cause.actions?.events.or.results.not.to.be.as.anticipated?.estimated.or.intended¡.There. can.be.no.assurance.that.such.statements.will.prove.to.be.accurate.as.actual.results.and.future. events.could.differ.materially.from.those.anticipated.in.such.statements¡.Although.the.Company. believes. that. the. expectations. reflected. in. such. forward‗looking. statements. are. based. upon. reasonable.assumptions?.it.can.give.no.assurance.that.its.expectations.will.be.achieved¡.Forward‗ looking.information.is.subject.to.certain.risks?.trends.and.uncertainties.that.could.cause.actual. results.to.differ.materially.from.those.projected¡.Many.of.these.factors.are.beyond.the.Company"s. ability.to.control.or.predict¡.Important.factors.that.may.cause.actual.results.to.differ.materially.and. that.could.impact.the.Company.and.the.statements.contained.in.this.news.release.can.be.found.in. the.Company"s.filings.on.SEDAR>¡.The.Company.assumes.no.obligation.to.update.or.supplement.any. forward‗looking.statements.whether.as.a.result.of.new.information?.future.events.or.otherwise¡. Accordingly?.readers.should.not.place.undue.reliance.on.forward‗looking.statements.contained.in. this.news.release.and.in.any.document.referred.to.in.this.news.release¡.This.news.release.shall.not.

constitute.an.offer.to.sell.or.the.solicitation.of.an.offer.to.buy.securities¡.Please.refer.to.the.Company"s. most.recent.filings.under.its.profile.at.on.SEDAR>.at.www¡sedarplus¡ca.for.further.information. respecting.the.risks.affecting.the.Company.and.its.business¡ The.CSE.has.neither.approved.nor.disapproved.the.contents.of.this.news.release.and.accepts.no. responsibility.for.the.adequacy.or.accuracy.hereof¡