Riverside Resources and Questcorp Prepare Phase 2B Exploration Drill Program at La Union Project, Sonora

(TSXV:RRI) (OTCQB:RVSDF) (FSE:5YY0) Riverside Resources Inc. announced that its next phase of drilling at the La Union Project, Sonora is fully funded and planned to begin soon. Riverside is the operator of the project, with Questcorp Mining Inc. as the option partner under an agreement referenced in a May 6, 2025 news release. The Phase 2B program will use reverse circulation (RC) drilling, which is expected to advance holes faster and collect larger sample volumes compared to core drilling. Preparatory work, including road construction and drill pad setup, is underway following the end of the rainy season. Phase 2B will focus on two main targets: Luis Hill and the Union Mine. Approximately 600 metres of RC drilling are planned, split into two holes of about 300 metres each. At Luis Hill, one hole will test an Induced Polarization (IP) chargeability anomaly extending over 1 km along strike, coinciding with sediment-hosted gold mineralization identified in Phase 1 and remaining open along strike and at depth. At the Union Mine, one hole will follow up on a projected extension of the structure where previous chip-channel sampling yielded 20.2 g/t Au, 226 g/t Ag, and 2.7% Zn over a continuous 30-metre interval. The Phase 2B program is expected to begin in November 2026. Seven diamond drill holes totaling 530.1 metres were completed during Phase 2A, but significant faulting slowed progress and limited recovery, with hole UND26-018 at Luis Hill terminated at 70 metres before reaching its planned 150-metre depth. RC drilling is intended to increase penetration rates and improve access to priority targets, while diamond core drilling will be used where detailed geological information is required. The Luis Hill target hosts sediment-hosted gold mineralization in the Clemente Formation, with the IP survey in 2026 delineating a chargeability anomaly over 1 km along strike. The planned Phase 2B hole at Luis Hill will be a near-vertical, 350-metre-deep drill hole. At the Union Mine, Phase 2A hole UND26-013 intersected the continuity of the historic Sproul manto mine, with anomalous Pb and Zn values indicating proximity to the replacement body. The Phase 2B hole at Union Mine is planned to test the continuity of the structure at an 80-metre step-out along strike, supported by ground magnetic geophysics. Exploration is funded by Questcorp under the option agreement, and Riverside manages drilling as operator. The scientific and technical data in the release were reviewed and approved by Julian Manco, P.Geo., a non-independent qualified person to Riverside Resources Inc.

Riverside Resources Executes Option Agreement for the Revel Carbonatite Rare Earth Element Project, British Columbia

(TSX-V:RRI) (OTCQB:RVSDF) (FSE:5YY0) Riverside Resources Inc. has entered into an option agreement with 1575540 B.C. Ltd., a private British Columbia company, pursuant to which the Optionee may acquire a 100% interest in Riverside’s Revel carbonatite rare earth element (REE) project located approximately 20 kilometres from the community of Seymour Arm, north of Revelstoke, in southeastern British Columbia.

Riverside Resources Intersects Near-Surface Gold and Base Metal Mineralization at Union Norte and Advances Multiple Targets for Phase 2B Drilling

(TSX-V:RRI) Riverside Resources Inc. reports assay results from the Phase 2A summer 2026 core drilling campaign at the Union Project in northwest Sonora, Mexico. The Phase 2A drill program follows up on high-grade gold-zinc mineralization and the successful Phase 1 drilling of late last year. The program has again intersected gold and base metals, continuing to expand upon the carbonate hosted replacement deposits (CRD) associated with past mining. The company states that the drilling is delivering further mineralization results. The Union Project is located in northwest Sonora, Mexico. The company is listed on TSX-V under the ticker RRI, on OTCQB as RVSDF, and on FSE as 5YY0.

Riverside Resources and Questcorp Announce Commencement of Phase 2 Drilling at Union Project, Sonora, Mexico

(TSXV:RRI) Riverside Resources Inc. announced that the Second Phase drill program has commenced at the Union Project in northwest Sonora, Mexico, in partnership with Questcorp Mining Inc. (CSE: QQQ). The fully funded program consists of a ~1,500-metre diamond drill program across 8 to 10 holes, each averaging 180 metres in depth, and requires no near-term dilutive financing. The program is designed to expand zones of mineralization intercepted during the Phase 1 program, test new areas developed during the winter 2026 field program, and covers more than five target areas across the 25 km² La Union project area. High-grade gold-silver chip channel samples taken underground at the Union Mine will be followed up with drilling, and the Jabali Area has returned high-grade assays of over 5 g/t Au. The company projects that follow-up drilling beyond Phase 2 is planned and can be expanded based on results and on the geophysics completed over the past several months. Riverside has a solid balance sheet with no debt and 93M shares outstanding, and the project is summarized in a recently published NI 43-101 Technical Report. The project features favorable limestone host rocks, an extensive alteration footprint, and multiple small-scale historical workings.

Riverside Resources and Questcorp Complete Expanded Aeromagnetic Drone Survey at La Union Project

Riverside Resources Inc. (TSXV: RRI, OTCQB: RVSDF), together with partner Questcorp, has completed an expanded aeromagnetic drone survey at the La Union Project in Sonora, Mexico. The survey added 145 flight lines (193 km) and 55 km of tie lines, totaling 248 km of drone coverage with 100m line spacing. This new data, combined with property-wide structural mapping and high-grade Phase 2 sampling results, is being used to finalize drill targets for a fully permitted summer 2026 drill program. Drill roads and pads are being prepared, and arrangements with the drilling contractor are progressing rapidly. An Induced Polarization (IP) geophysical survey with 5 planned IP lines is set to commence shortly, concurrent with drilling the first targets. Riverside operates the project through its Mexican subsidiary and maintains a strong balance sheet with over C$5,000,000 cash and no debt. The company and its partner remain on track for drill mobilization at La Union in the coming weeks.

Riverside Resources Reports High-Grade Gold, Silver and Base Metal Assays from Phase 2 Field Work at La Union Project

Riverside Resources Inc. (TSXV: RRI, OTCQB: RVSDF) reported Phase 2 field work results from the La Union Project in Sonora, Mexico, highlighting high-grade gold, silver, and zinc assays from near-surface oxidized mine workings. Key results include a 2.9 m channel sample averaging 20 g/t gold and 1.83% zinc, with a 0.6 m interval at 91.7 g/t gold and a 0.3 m interval grading 40% zinc at the Union Mine. At Union Norte, channel samples returned up to 4.38 g/t gold, 1,413 g/t silver, 7.7% lead, and 6.38% zinc. Three new target areas—Jabalí, La Negra, and Ali Hill—were defined for follow-up work. The company has over C$5,000,000 cash, no debt, and is preparing for a summer 2026 drill program.