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RGR.CN ·

Rio Grande Resources Submits Application to Uplist to the OTCQB Venture Market

Listings & Exchange

Rio Grande Resources Submits Application to Uplist to the

OTCQB Venture Market

VANCOUVER, British Columbia, May 13, 202 5 – Rio Grande Resources Ltd. (CSE: RGR)

(OTCPINK: RGRLF) (“Rio Grande” or “RIO” the “Company”), an emerging North American gold and

silver exploration company, is pleased to announce that it has filed an application to have its

common shares uplisted to the OTCQB® Venture Market (the “ OTCQB”) in the United States ,

following the Company’s recent listing on the OTC Pink Market.

The OTCQB Venture Market is the premier marketplace for early stage and developing

entrepreneurial-stage companies . The OTCQB is considered by the Securities and Exchange

Commission as an “established public market” for determining the public market price when

registering securities for resale and international companies and applies standards that promote

price transparency and facilitate public disclosure. To be eligible, companies must be current in their

reporting and undergo an annual verification and management certification process.

Jason Barnard, President, and CEO of Rio Grande, comments: “Our OTCQB uplisting marks the next

strategic step in Rio Grande’s growth – expanding our U.S. investor base, elevating our profile, and

positioning us alongside established explorers. Paired with our Canadian listing, this will create a

powerful North American platform to fund our growing exploration pipeline in New Mexico's premier

mining districts. The OTCQB is a perfect environment and compliments our district-scale exploration

program, our future plans and its expected demands. This uplisting simply just won’t be an upgrade

– it’s the right platform for the discoveries ahead. ”

Upon approval, Rio Grande shares are expected to continue to trade with a U.S. ticker symbol

“RGRLF”. The Company’s common shares will continue to trade on the Canadian Securities

Exchange (“CSE”) under the symbol “ RGR”. The trading of the Company's common shares on the

OTCQB remains subject to several approvals, including by the OTC Markets Group and the

satisfaction of all applicable OTCQB standards. Shareholders will be updated on the status of the

Company’s progress as more information becomes available.

Appointment

Rio Grande is pleased to announce the appointment of Shayla Forster as Corporate Secretary,

following the departure of Kelly Pladson. Ms. Forster is a seasoned governance professional with over

a decade of corporate governance, corporate secretarial, and securities regulation experience with

a focus on the mining sector. Her proven track record in regulatory filings, board governance, and

shareholder communications will be instrumental as the Company advances the Winston Gold and

Silver Group of Properties. The Company thanks Kelly Pladson for her dedicated service during which

she provided exceptional corporate governance and compliance support.

In connection with the appointment that it has granted 20,000 incentive stock options of the

Company. The incentive stock options were granted on May 12, 2025, fully vested, have an exercise

price of $0. 085 per share, and are valid for a 3-year period from the grant date. 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

About Rio Grande Resources

Rio Grande Resources (CSE:RGR) (OTC: RGRLF) 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 corporat e

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

Lucas A. Zimmerman

Managing Director

MZ Group - MZ North America

(949) 259-4987

[email protected]

www.mzgroup.us

Follow us or contact us on social media:

X: https://x.com/RioGrandeRGR

LinkedIn: https://www.linkedin.com/company/rio-grande-resources-ltd/

Facebook: https://www.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 us ed in applicable United States and

Canadian laws and including, without limitation, within the meaning of the Private Securities

Litigation Reform Act of 1995, for which the Company claims the protection of the safe harbor for

forward looking statements. S uch 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 resul ts, 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 a nticipated, 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 expect ations 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 a ctual

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.