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VANCOUVER, British Columbia, Sept. 09, 2026 (GLOBE NEWSWIRE) — Riverside Resources Inc. (“Riverside” or the “Company”) (TSX-V: RRI) (OTCQB: RVSDF) (FSE: 5YY0), is pleased to report the assay results from the Phase 2A summer 2026 core drilling campaign following up on the high-grade gold-zinc mineralization and successful Phase 1 drilling of late last year. The Phase 2A drill program at the Union Project in northwest Sonora, Mexico has again intersected gold and base metals, continuing to expand upon the carbonate hosted replacement deposits (CRD) associated with past mining while also delivering success at new targets and advancing district-wide targeting. The exploration work is being carried out by Riverside in partnership with Questcorp Mining Inc. (CSE: QQQ), who is earning into the project through an option agreement (see news release, May 6, 2025). The success from this part of the program, which included core drilling, can now be expanded upon when Phase 2B drilling resumes following the seasonal break for the monsoon rainy season, which typically wraps up toward the end of September. These results confirm two main target areas. The program will continue drilling these areas, along with sediment-hosted gold targets at Luis Hill and vein targets at the Jabali area. Union and Union Norte drill results are summarized below, with further drilling planned for the Phase 2B drill campaign.

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Phase 2A Highlights

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An initial 7 holes were drilled with positive drill intercepts at the Union Mine and Union Norte areas (Figure 1) comprising Phase 2A which will then be next followed with Phase 2B after monsoon season ends in early October 2026.

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  • UND26-015 at the Union Norte target returned 14.60 m of 0.45 g/t Au Eq starting at 1.0 m with higher interval of 7.60 m grading 0.80 g/t Au Eq and 4.60 m of 1.09 g/t Au Eq from 8.00 m. This hole successfully crossed an interpreted NNW-trending feeder structure with anomalous gold, lead, and zinc values from near surface and can be next drilled along strike and down dip to continue to expand as shown in figure below.
  • UND26-014 at the Union Norte target returned 9.10 m of 0.76 g/t Au Eq from 1.90 m, including a higher-grade subset of 1.5 m of 3.38 g/t Au Eq from 9.50 m confirming the near-surface mineralized feeder structure along strike from UND26-015 as can be seen in figure below.
  • UND26-013 at the Union Mine intersected the continuity of the historic Sproul manto mine near the past underground mining, with anomalous Pb and Zn values indicating proximity to the replacement body which can be followed up with additional drilling.
  • Induced Polarization survey at Luis Hill delineated a large chargeability anomaly extending over 1 km in strike along the IP line and with a 200 m depth thickness of a chargeable signal interpreted to potentially be associated with the sediment-hosted gold target identified in Phase 1 drilling (see news release, January 22, 2026). The anomaly remains ready for follow up drilling.

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“Working with our partner Questcorp, we are pleased with the positive results from the initial part of Phase 2 drilling, and we look forward to further drilling once the rainy season ends. Grades above 0.5 g/t are significant, as mines in the region produce at this grade or higher. We see high grades in old workings, at surface, and in targets within the CRD-style and sediment-hosted bulk gold-style mineralization. Consistent near-surface intercepts are encouraging, with grades similar to those at nearby operations near Union. The positive results at the Union and Union Norte targets build on our last drill campaign, and we can now move to Phase 2B drilling at these areas, as well as additional locations outlined in the exploration program,” said John-Mark Staude, CEO of Riverside Resources.

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Figure 1. Drill Collar Location Map – 2025-2026 Drill Program. The figure illustrates the collar locations for both 2025 and 2026. The 7 drill holes reported in this news release are in green. Section lines correspond to drill cross-sections presented in Figures 2, 3, and 4. Collar coordinates are summarized in Table 2