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Rio Grande Resources Announces Closing of Over-Subscribed Non-Brokered Private Placement for $2.55 Million

Financings

Rio Grande Resources Announces Closing of Over-Subscribed

Non-Brokered Private Placement for $2.55 Million

NOT FOR DISTRIBUTION TO U.S. NEWS WIRE SERVICES OR DESSIMINATION IN THE UNITED

STATES

VANCOUVER, British Columbia, August 24, 2026 – Rio Grande Resources Ltd. (CSE: RGR,

OTCQB: RGRLF, FSE: 488) (“Rio Grande” or “RIO” the “Company”), is pleased to announce that,

further to its news release dated August 7, 2026; it has closed its previously announced non-brokered

private placement for gross aggregate proceeds of $ 2,546,500 (the “Private Placement”) through

the issuance of 12,732,500 units of the Company (each, a “Unit”) at a price of $0.20 per Unit.

Each Unit consisted of one common share (each, a " Share") and one transferable common share

purchase warrant (each, a "Warrant"). Each Warrant entitles the holder to purchase one additional

Share of the Company at a price of $0.40 per Share for a period of (2) two years from the date of

issuance.

The net proceeds will be allocated towards exploration activities and for general corporate purposes.

Fees of $141,510 were paid and 707,550 finder’s warrants issued (the "Finder's Warrants") to certain

finders in connection with the Private Placement. Each Finder's Warrant is exercisable into one Share

for a period of (2) two years after the date of issuance at an exercise price of $0.34.

In accordance with the regulations of the Canadian Securities Exchange (“ CSE”), a ll securities

issued pursuant to the Private Placement will be subject to a hold period of four months and one day

as required under applicable securities legislation.

The securities offered under the Private Placement have not been, nor will they be, registered under

t h e U . S . S e c u r i t i e s A c t , a s a m e n d e d , o r a n y s t a t e s e c u r i t i e s l a w , a n d m a y n o t b e o ff e r e d , s o l d o r

delivered, directly or indirectly, within the United Stat es, or to or for the account or benefit of U.S.

persons, absent registration or an exemption from such registration requirements. This news release

does not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of

securities in any state in the United States in which such officer, solicitation or sale would be

unlawful.

About Rio Grande Resources

Rio Grande Resources (CSE: RGR) (OTCQB: RGRLF) (FSE: 488) 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, CEO and Director

(604) 767-6598

[email protected]

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 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 to, the Company's expectations with respect to the Private Placement;

and the use of proceeds under the Private Placement;. 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, pr ojections, 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 stateme nts. 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 Units, continuity of agreements with third parties, risks and uncertaintie s

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 Com pany 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 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.