Questcorp Mining Inc. (CSE: QQQ,OTC:QQCMF) (OTCQB: QQCMF) (FSE: D910) (the ‘Company’ or ‘Questcorp’) is pleased to announce the completion of the first phase of drilling at the La Union gold and silver Project in Sonora, Mexico. A total of 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.’
Questcorp President & CEO said, ‘We are excited to have completed this first phase of drilling at La Union through the guidance of the accomplished Riverside technical team and their subcontracted drillers. The company anxiously awaits the return of the assays from the lab as we look to plan follow on development.’
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.
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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.
Qualified Person & QA/QC:
The technical content of this news release has been reviewed and approved by R. Tim Henneberry’, P.Geo (BC) a Director of the Company and a Qualified Person under National Instrument 43-101.
Rock samples from previous exploration programs discussed above at the Project were taken to the Bureau Veritas Laboratories in Hermosillo, Mexico for fire assaying for gold. The rejects remained with Bureau Veritas in Mexico while the pulps were transported to Bureau Veritas laboratory in Vancouver, BC, Canada for 45 element ICP/ES-MS analysis using 4-acid digestion methods. A QA/QC program was implemented as part of the sampling procedures for the exploration program. Standards were randomly inserted into the sample stream prior to being sent to the laboratory.
About Questcorp Mining Inc.
Questcorp Mining is engaged in the business of the acquisition and exploration of mineral properties in North America, with the objective of locating and developing economic precious and base metals properties of merit. The company holds an option to acquire an undivided 100-per-cent interest in and to mineral claims totalling 1,168.09 hectares comprising the North Island copper property, on Vancouver Island, B.C., subject to a royalty obligation. The company also holds an option to acquire an undivided 100-per-cent interest in and to mineral claims totalling 2,520.2 hectares comprising the La Union project located in Sonora, Mexico, subject to a royalty obligation.
ON BEHALF OF THE BOARD OF DIRECTORS,
Saf Dhillon
President & CEO
Questcorp Mining Inc.
saf@questcorpmining.ca
Tel. (604-484-3031)
Suite 550, 800 West Pender Street
Vancouver, British Columbia
V6C 2V6.
Certain statements in this news release are forward-looking statements, which reflect the expectations of management regarding completion of survey work at the North Island Copper project. Forward-looking statements consist of statements that are not purely historical, including any statements regarding beliefs, plans, expectations or intentions regarding the future. Such statements are subject to risks and uncertainties that may cause actual results, performance or developments to differ materially from those contained in the statements. No assurance can be given that any of the events anticipated by the forward-looking statements will occur or, if they do occur, what benefits the Company will obtain from them. Except as required by the securities disclosure laws and regulations applicable to the Company, the Company undertakes no obligation to update these forward-looking statements if management’s beliefs, estimates or opinions, or other factors, should change.
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