Mr. Jason Barnard reports

RIO GRANDE RESOURCES UPLISTS TO OTCQB VENTURE MARKET IN THE UNITED STATES

Rio Grande Resources Ltd.'s common shares have been approved and uplisted to the OTCQB Venture Market in the United States and began trading today, June 30, 2025, under the ticker symbol RGRLF, without disruption. The company's shares will continue to trade on the Canadian Securities Exchange (CSE) under the symbol RGR.

The OTCQB Venture Market is recognized by the United States Securities and Exchange Commission as an established public market providing public information for analysis and valuation of securities. It is designed for developing and entrepreneurial companies in the U.S. and abroad, applying standards that promote price transparency and facilitate public disclosure. To be eligible for the OTCQB Venture Market, companies must be current in their financial reporting and undergo an annual verification and management certification process, including meeting a minimum bid price and other financial conditions. These compliance and quality standards provide investors improved transparency for making informed investment decisions and for determining the public market price when registering securities for resale for international companies.

Jason Barnard, chief executive officer of Rio Grande, commented: "Graduating to the OTCQB represents an important milestone for Rio Grande as we continue to execute on our growth strategy. This uplisting enhances our visibility with U.S. investors, improves liquidity and reflects our commitment to operating with a high standard of transparency and governance. We believe this will further support our efforts to build long-term value for our shareholders."

Investors can find real-time quotes and market information for the company on the OTC Markets website.

Equity grants

Rio Grande has granted a total 946,587 restricted share units (RSUs), collectively, to certain directors, officers and consultants of the company, in accordance with the Rio Grande's stock incentive plan. The plan's goal is to create an incentive compensation program that is aligned with the company's long-term objectives. The RSUs are subject to vesting provisions, with the exception of 75,000 RSUs that were granted fully vested in association with the successful listing of Rio Grande Resources. All awards are subject to a statutory hold period of four months and one day and were granted in accordance with the policies of the CSE.

About Rio Grande Resources Ltd.

Rio Grande Resources 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 a 100-per-cent interest in the Winston project group, which includes the patented historical Ivanhoe and Emporia claims and the Little Granite mine, 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-sulphidation epithermal setting.

We seek Safe Harbor.