Riverside Resources and Questcorp Complete Geophysics Programs and Continue Drilling at La Union Project

About this update from Riverside Resources Inc

VANCOUVER, British Columbia, July 09, 2026 (GLOBE NEWSWIRE) -- Riverside Resources Inc. (“Riverside” or the “Company”) (TSX-V: RRI) (OTCQB: RVSDF) (FSE: 5YY0) is pleased to announce, with partner Questcorp Mining Inc. (CSE: QQQ) (OTCQB: QQCMF) (FSE: D910) ("Questcorp"), the completion of expanded geophysical programs linked to the current drilling at the La Union Project, Sonora, Mexico. The programs included an aeromagnetic drone survey and an Induced Polarization ("IP") ground geophysics survey. The aeromagnetic survey has been completed, and the processed data has now been received and can be integrated into the ongoing summer core drilling program at La Union. The IP ground survey has also been completed, with processed results expected soon; this data will build on current drill targets and is anticipated to identify expansions and additional targets, consistent with the robust H1 2026 exploration efforts at the project. The geophysics can potentially be applied immediately to the active drill program, which has so far focused on three areas: Union, Union North, and Jabali. The IP data covering these areas is being used to interpret results from completed drilling and to expand targets, extending the potential for drilling along strike and at depth. Initial work had generally relied on surface mapping, geochemistry, and past mine activity as a guide. This more robust and expansive geophysical dataset helps place Union's discovery potential in a larger regional context, similar to major deposits in Arizona and Sonora where these tools have proven effective at that scale. Highlights IP program completed and extended over current drilling and into new mapped target areasDrilling completed at Union and Union North targetsActively drilling the Jabali targetAeromagnetic drone survey: The final report has been received for 145 flight lines totaling 193 km, plus 20 tie lines totaling 55 km, for 248 km of total drone coverage. The survey builds on the 2025 baseline dataset and was flown at 100 m line spacing for high-resolution definition, which now shows good targetsCross structures trending NE and NW potentially coincide with mapped feeder fault zones for the Carbonate Replacement Deposit (“CRD”) and sediment-hosted goldRelating the outcropping diorite bodies into a larger context for potential scale and their relationship to the known gold-zinc mineralized...

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