Riverside Resources Announces Completion of Phase One Drilling at Union Project and Now Awaits Drill Assay Results ~Over 1600 metres drilled to date and 700+ samples shipped to laboratory~
Riverside Resources Announces Completion
of Phase One Drilling at Union Project and
Now Awaits Drill Assay Results
~Over
1600 metres drilled to date and 700+ samples shipped to laboratory~
Vancouver, British Columbia--(Newsfile Corp. - November 12, 2025) - Riverside Resources Inc. (TSXV:
RRI) (OTCQB: RVSDF) (FSE: 5YY0) ("
Riverside
" or the "
Company
"), is pleased to announce the
completion of the first phase of drilling at the Union Project in Sonora, Mexico.
12 diamond core holes
were completed for a total of just over 1,600 metres across six priority targets. The work is being
advanced with funding through partner Questcorp Mining Inc. ("
Questcorp
") under the option agreement
announced earlier in 2025 with Riverside as Operator and managing the exploration program.
Program Highlights
12 core holes completed totaling >1,600 m.
Six targets drilled: Union Mine, Union Norte, Cobre, Luis, Famosa, and Famosa Mag.
Three past-producing mine areas tested adjacent to historic workings to evaluate continuity.
>700 half-core samples shipped; assays pending.
Holes oriented as angle and near-vertical to cut stratigraphy and structures typical of Carbonate
Replacement Deposit-type ("CRD") systems, with focus beneath oxidized horizons generally <150
m depth.
"This first exploration phase accomplished initial drill holes into 6 target areas. We tested multiple
shallow gold and base metals targets, confirmed the key carbonate host units recognized by historic
mining at Union and Famosa, and gathered the structural and alteration data to further progress efficient
mineral exploration," said Dr. John-Mark Staude, President and CEO of Riverside Resources. "This
historically mined CRD district, validated by new drilling and improved datasets, advances our geologic
model and supports the potential for a large-scale discovery. With six targets advanced and more than
700 samples at the lab, once results are received, we will scope the next exploration program and focus
on the most prospective trends indicated by assay results, stratigraphy, structure, and geophysics."
Drilling Update by Area
Union Mine
: Three holes at the Union Mine targeted manto horizons and chimney/feeder structures
adjacent to historic underground workings. This reconnaissance drilling was designed to evaluate
stratigraphy, alteration, and mineralization continuity typical of CRD systems.
Famosa Mine Area
: Four core holes tested a west-dipping dolomite manto target and adjacent
structures. Logging noted intrusive dikes and breccias; no geochronology has been completed.
Historical small-scale mining left surface dumps reported with gold grades of >0.5 oz/t Au (>15 g/t) in an
independent NI 43-101 report filed on SEDAR+, May 7, 2025, by Questcorp. An inclined shaft dipping
~70° to the west parallels the favorable horizon. Holes were drilled at angles toward the east to intersect
the target as close to perpendicular as practical and to evaluate continuity of alteration and
mineralization.
Union Norte
: Two initial holes tested the manto horizon within dolomitic carbonate strata to evaluate
continuity and geometry along favorable trends mapped near historic workings. This phase targeted the
westward extension. Follow-up work, including possible step-outs to the east, will be considered after
assays and geological interpretation.
Cobre and Luis
: Each target was tested to assess style, structure, and controls on mineralization.
Results to date show sulfides, mineralization types, and intrusions aligned with a carbonate-hosted
metals system.
Figure 1:
Map of drill targets and core drill hole locations for the 12 holes of Phase 1 program.
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/6101/274043_4f76f41f0415684e_002full.jpg
Sampling and Assays
Core was logged, saw-cut, and half-core samples were shipped for analysis. Samples from the first
eight holes were delivered to Bureau Veritas (Hermosillo, Sonora) for gold fire assay, with pulps
forwarded to Vancouver, Canada for Inductively Coupled Plasma-Mass Spectrometry ("ICP-MS")
following four-acid digestion to determine silver, base metals, and pathfinders. Samples from the final
four holes were shipped to ACT Labs Zacatecas, where preparation, gold assay, and multi-element ICP
are completed in Mexico. Remaining half-cores are retained for reference. The final 4 holes of the
program were shipped to ACT Labs where they were similarly assayed using the same processing
methods but with their initial preparation and assaying completed in Zacatecas, Mexico using the same
ICP and gold fire assay methods.
Next Steps
After assays are received, the Company plans to announce results and begin work to integrate the full
exploration results including the assays, core logging, geophysics, advance detailed multi-element
geochemistry, and updated structural mapping to refine the CRD model and scope for a Phase 2
exploration campaign.
The Phase 2 campaign will likely include more extensive drilling and other
exploration work as this Phase 1 was only an initial sampling into some of the targets at Union.
This next
expanded drill program could take place in H1, 2026 as all permits and access are in good standing and
with the new data targets will be ready to explore.
Qualified Person & QA/QC:
The scientific and technical data contained in this news release pertaining to the Project was reviewed
and approved by Freeman Smith, 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 less than 75M 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:
John-Mark Staude
President, CEO
Riverside Resources Inc.
Phone:
(778) 327-6671
Fax:
(778) 327-6675
Web:
www.rivres.com
Eric Negraeff
Corporate Communications
Riverside Resources Inc.
Phone: (778) 327-6671
TF: (877) RIV-RES1
Web:
www.rivres.com
Certain statements in this press release may be considered forward-looking information. These statements can be identified by the use of
forward-looking terminology (e.g., "expect"," estimates", "intends", "anticipates", "believes", "plans"). Such information involves known and
unknown risks -- including the risk that the Transaction will not be completed as contemplates, or at all, availability of funds, the results of
financing and exploration activities, the interpretation of exploration results and other geological data, or unanticipated costs and expenses and
other risks identified by Riverside in its public securities filings that may cause actual events to differ materially from current expectations.
Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release.
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accepts responsibility for the adequacy or accuracy of this release.
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