Rio Grande Resources raises up to $2,500,000 via private placement

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

VANCOUVER, BC / ACCESS Newswire / August 7, 2026 / Rio Grande Resources Ltd. ( CSE: RGR)(OTCQB : RGRLF)(FSE :488 ) (" Rio Grande " or " RIO " the " Company "), is pleased to announce a non-brokered private placement of up to 12,500,000 units of the Company (each a " Unit ") at a price of $0.20 per Unit for gross proceeds of up to $2,500,000 (the " Private Placement ").

Each Unit will consist of one common share (each, a " Share ") and one transferrable 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 24 months from the date of issuance.

Directors and officers of the Company may acquire securities under the Private Placement, which will be considered a "related party transaction" as defined under Multilateral Instrument 61-101 ("MI 61-101"). Such participation is expected to be exempt from the formal valuation and minority shareholder approval requirements of MI 61-101.

The net proceeds will be allocated towards exploration activities and for general corporate purposes. In accordance with the regulations of the Canadian Securities Exchange (" CSE "), all 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. Finders' fees may be payable in connection with the Private Placement in accordance with the policies of the CSE.

Closing of the Private Placement is expected to occur on or around August 24, 2026.

The securities offered under the Private Placement have not been, nor will they be, registered under the U.S. Securities Act, as amended, or any state securities law, and may not be offered, sold or delivered, directly or indirectly, within the United States, 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