Dr. John-Mark Staude reports

RIVERSIDE RESOURCES AND QUESTCORP MINING EXECUTE DEFINITIVE OPTION AGREEMENT FOR LA UNION PROJECT, SONORA, MEXICO

Further to its press release dated Sept. 6, 2024, Riverside Resources Inc.'s wholly owned subsidiary, RRM Exploracion SAPI de CV (the vendor), has entered into a definitive option agreement with Questcorp Mining Inc. dated May 5, 2025, for the 2,520.2-hectare La Union carbonate replacement gold-polymetallic project, located in Sonora, Mexico.

"We are thrilled to finalize this agreement for the La Union project, which is a strong asset in Riverside's portfolio. Securing up to $5.5-million in exploration funding from Questcorp is an excellent step forward in advancing this larger carbonate replacement deposit (CRD) project," said John-Mark Staude, chief executive officer of Riverside Resources. "Riverside is pleased to have the updated NI [National Instrument] 43-101 technical report completed and we see an active exploration program launching in the coming weeks with Riverside as the operator of the exploration program. Riverside is expected to become a shareholder of Questcorp with an initial 9.9-per-cent equity interest, subject to final approval by the Canadian Securities Exchange or confirmation that such approval is not required. The first-year work program of $1-million in exploration expenditures will launch the first round of exploration at the project."

The La Union project

The project is summarized on the Riverside website and is a project that Riverside acquired and further consolidated additional inlier mineral claims. The project initially identified from Riverside's work in the western Sonora gold belt through work with AngloGold Ashanti Ltd., Centerra Gold Inc. and Hochshild Mining PLC, among others as partners and financing relationships for gold exploration. Initial work by members of the Riverside team, drawing on more than two decades of geological compilation and analysis, identified this region as highly prospective. At the project, historical mining by the Penoles Mining Company focused on chimney and manto replacement bodies within the upper oxide zones. As a result, the underlying sulphide zones present immediate drill targets for further exploration.

Riverside has spent the past five years consolidating this highly prospective land package, which totals over 22 square kilometres. The project features favourable limestone host rocks, an extensive alteration footprint and multiple small-scale historical workings, providing more than eight drill-ready target areas. Key immediate targets include the central Union mine and the nearby Famosa mine. With drive-up access, private ranch surface rights and strong geologic similarities to other major CRDs in Arizona and eastern Mexico, La Union is well positioned for near-term exploration success targeting both oxide and deeper sulphide mineralization.

The option agreement

In accordance with the terms of the transaction, Questcorp can acquire a 100-per-cent interest in the project in consideration for completion of a series of cash payments totalling $100,000, making staged issuances of common shares of Questcorp totalling 19.9 per cent and incurring $5.5-million of exploration expenditures on the project as outlined immediately below.

During the term of the option agreement, Riverside, through the vendor, will remain the program operator for the project using its local team based in Hermosillo, Sonora. Following exercise of the option under the option agreement, Questcorp will grant Riverside a 2.5-per-cent smelter return royalty on commercial production from the project.

Qualified person and quality assurance/quality control

The scientific and technical data contained in this news release pertaining to the project was reviewed and approved by Freeman Smith, PGeo, vice-president, exploration, a non-independent qualified person to Riverside Resources, who is responsible for ensuring that the information provided in this news release is accurate and who acts as a qualified person under National Instrument 43-101, Standards of Disclosure for Mineral Projects.

Rock samples from previous exploration programs discussed above at the project were taken to the Bureau Veritas Laboratories in Hermosillo, Mexico, for fire assaying for gold. The rejects remained with Bureau Veritas in Mexico while the pulps were transported to Bureau Veritas laboratory in Vancouver, B.C., Canada, for 45-element ICP/ES-MS analysis using four-acid digestion methods. A QA/QC program was implemented as part of the sampling procedures for the exploration program. Standards were randomly inserted into the sample stream prior to being sent to the laboratory.

About Riverside Resources Inc.

Riverside is a well-financed exploration company driven by value generation and discovery. The company has over $4-million in cash, no debt and less than 75 million shares outstanding, with a strong portfolio of gold-silver and copper assets and royalties in North America. Riverside has extensive experience and knowledge operating in Mexico and Canada and leverages its large database to generate a portfolio of prospective mineral properties. Riverside has properties available for option, with information available on the company's website.

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