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

VANCOUVER, British Columbia, Nov. 06, 2026 (GLOBE NEWSWIRE) -- Riverside Resources Inc. ( "Riverside " or the "Company ") (TSX-V: RRI) (OTCQB: RVSDF) (FSE: 5YY0), is pleased to announce that its next phase of drilling at La Union Project, Sonora is fully funded and planned to begin soon. The rainy season has ended, and road work and drill pad construction are underway to prepare for the program. Riverside is the operator, and Questcorp Mining Inc. is the option partner (see news release dated May 6, 2025). The new Phase 2B program is planned to use reverse circulation (“RC”) drilling. RC drilling can advance holes faster than core drilling and collects larger sample volumes. Core drilling so far has not intersected water, so the RC holes can likely be drilled mostly dry, which may improve speed and cost efficiency. The program will mainly target Luis Hill and the Union Mine. Phase 2A core drilling, with results reported on September 9, 2026, intersected gold mineralization at Union and the Union Mine. Phase 2B will build on those results at the Union Mine and will test the sediment-hosted gold mineralization and the IP conductor unit at Luis Hill.

Immediate work on road access, logistics, field sampling and target review is progressing, and Phase 2B is expected to begin in November 2026.

Phase 2B Planned Actions

• Approximately 600 m of RC drilling planned in two holes of approximately 300 m each.
• Luis Hill: one hole to test the Induced Polarization ( "IP ") chargeability anomaly extending over 1 km along strike, which coincides with the sediment-hosted gold mineralization identified in Phase 1 drilling and remains open along strike and at depth.
• Union Mine: one hole to follow up on a projected extension of the structure were chip-channel ( "channel ") sampling yielded 20.2 g/t Au and 226 g/t Ag with 2.7% Zn in 30 mlong continuous from the Union Mine (news release, January 22, 2026).
• Change in drilling method: RC drilling is intended to increase penetration rates and improve access to targets at depth and will be evaluated as a more cost-effective method for future drill programs at Union.
• Drilling managed by Riverside as operator, with exploration funded by Questcorp under the option agreement.
  

"The Phase 2A exploration program outlined a large IP target at Luis Hill and continuity of mineralization at Union. Phase 2B plans to test both of these targets with RC drilling. We expect RC drilling to advance more efficiently through the faulted ground encountered during core drilling. If the RC drilling performs as planned, it will give us a more cost-effective way to drill at Union and provide the option to run larger programs in the future, " said John-Mark Staude, President and CEO of Riverside Resources.

Figure 1: Map of La Union Project showing the planned Phase 2B drill holes at Luis Hill (Upper Right) and Union Mine (Lower Right) targets, with 2025 and 2026 drill collars.

Change to RC Drilling

Seven diamond drill holes totaling 530.1 metres were completed during Phase 2A. Significant faulting within the targeted formations slowed core drilling and limited progress and recovery in several holes, and hole UND26-018 at Luis Hill was terminated at 70 m before reaching its planned 150 m target depth. RC drilling is intended to increase penetration rates and improve access to priority targets, while preserving the option to use diamond core where detailed geological information is required. Results from Phase 2B will be used to assess the use of RC drilling in future programs at the project.

Luis Hill Target

Luis Hill hosts sediment-hosted gold mineralization identified in the upper part of the Clemente Formation during Phase 1 drilling (see news release, January 22, 2026). Riverside 's geology team has mapped the stratigraphy and structure northward for over 2 km and identified cross-cutting feeder structures as targets. The IP survey completed in 2026 delineated a chargeability anomaly at Luis Hill extending over 1 km along strike that coincides with the sediment-hosted gold mineralization from Phase 1 and remains open along strike and at depth. Phase 2A hole UND26-018 was drilled above the anomaly but did not reach target depth. The Phase 2B hole is planned to test a geophysical anomaly with a near-vertical, 350 m deep drill hole.

Union Mine Target

Phase 2A hole 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. Similarly, rock chip-channel sampling returned 30 m grading 20.2 g/t Au, 226 g/t Ag and 2.7% Zn along the access wall to the upper part of the Union Mine. The structure is hosted in the Clemente Formation, a major carbonate replacement deposit ( "CRD ") host unit, with potential for sediment-hosted gold in the reactive shales above and below the host carbonate. The Phase 2B hole in the Union Mine Target is planned to test the continuity of the structure at an 80 m step-out along strike, supported by the ground magnetic geophysics of the project.

Qualified Person & QA/QC

The scientific and technical data contained in this news release pertaining to the Project was reviewed and approved by Julian Manco, P.Geo., a non-independent qualified person to Riverside Resources Inc., 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.

About Riverside Resources Inc.

Riverside is a well-funded exploration company driven by value generation and discovery. The Company has a solid balance sheet with no debt and fewer than 95M 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 at www.rivres.com. 

ON BEHALF OF RIVERSIDE RESOURCES INC.

"John-Mark Staude "
Dr. John-Mark Staude, President & CEO

For additional information contact:

This news release contains “forward-looking information” within the meaning of applicable Canadian securities laws. Forward-looking information can be identified by words such as “expect”, “estimate”, “intend”, “anticipate”, “believe”, “plan”, “could” and similar expressions. Forward-looking information in this news release includes, but is not limited to, statements regarding the mobilization of the drill rig and the timing of Phase 2B drilling; the planned number, location and length of drill holes; the expected performance and cost of reverse circulation drilling compared with core drilling; the potential for larger drill programs in the future; the interpretation of geophysical and drilling data at the Luis Hill and Union Norte targets; and the timing of reporting results.

Forward-looking information is based on assumptions that management considers reasonable, including the availability of drilling contractors, equipment and personnel; weather and ground conditions; continued access to the Project and maintenance of required permits; and continued funding under the option agreement with Questcorp. Forward-looking information involves known and unknown risks and uncertainties, including drilling and operational risks, delays, unexpected ground conditions, the possibility that RC drilling does not achieve the expected penetration rates or cost savings, the interpretation of exploration results and other geological data, the availability of funds, changes in metal prices, and other risks identified in Riverside’s public filings available on SEDAR+ atwww.sedarplus.ca. Actual results may differ materially from those expressed or implied. Readers are cautioned not to place undue reliance on forward-looking information, which speaks only as of the date of this news release. Riverside does not undertake to update forward-looking information except as required by applicable securities laws.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/2b1a2f9b-f069-4b80-b183-9df301b1515c.

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