The joint venture between Questcorp Mining Inc. and Riverside Resources has completed an enlarged drone aeromagnetic survey over the La Union Project in Sonora, Mexico. This update combines the expanded magnetic dataset with district-scale structural mapping and the Phase 2 high-grade sampling results announced on May 5, 2026, to refine and prioritize targets ahead of the fully permitted summer drill campaign. With drill roads and pads now under construction, field teams are rapidly preparing for drill mobilization.
The survey expansion added a further 248 line km of coverage—comprised of 193 line km along 145 flight lines and 55 line km of tie lines (20 tie lines)—building on the baseline grid from 2026. The broader grid improves the ability to image magnetic bodies and subsurface structures beneath areas of post-mineral cover, helping to trace potential mineralizing controls that were historically obscured.
Survey expansion and technical highlights
The enlarged airborne program was flown with a magnetometer suspended beneath a drone along parallel lines, with perpendicular tie lines used to level and validate the dataset. The result is district-wide magnetic imaging that extends beyond the 2026 baseline and offers a more continuous view of the structural framework at depth. Early interpretation highlights several northwest-trending features that, when correlated with spring 2026 field mapping, are interpreted as plausible ore controls worth testing with targeted drilling.
Aeromagnetic dataset specifics
The additional 193 line km of flight data and 55 line km of tie lines provide improved resolution for magnetic contrasts and structural discontinuities. By integrating this dataset with historical and recent mapping, geoscientists can delineate magnetic anomalies and prioritize zones where altered or mineralized systems might extend beneath shallow cover. The team is using these magnetic signatures to generate a prioritized short list of drill-ready targets for the upcoming program.
Mapping integration and sampling context
Alongside the aeromagnetic work, crews completed detailed 1:1,000 geologic mapping in priority target areas and broader 1:5,000 district-scale mapping to improve subsurface interpretations. These efforts, combined with the May 5, 2026 high-grade surface and underground sampling, supply the geologic context needed to distinguish prospective structural corridors from background geology. The integration of magnetic imagery with mapped faults and alteration zones is central to assembling a robust exploration model.
Path forward to drilling
With the aeromagnetic interpretations in hand, the next step is to integrate them with an upcoming Induced Polarization (IP) geophysical survey, planned to commence shortly. The IP survey will help delineate chargeability and resistivity contrasts that can indicate sulphide-rich zones, providing a complementary dataset to the magnetic imagery and reducing exploration risk prior to drilling. Meanwhile, construction of access roads and drill pads is underway, and logistical partners have been contracted to support drill mobilization.
Site preparations and operational readiness
Permitting is complete for the planned program and site access arrangements are secured, allowing crews to proceed with civil works and rig staging. The operators report that drill roads and pads are being established and that contractor mobilization is progressing quickly. The combined readiness of permitting, access, and geophysical contractors positions the venture to begin drilling in the coming weeks, subject to final operational checks and geophysical refinements.
Corporate, regulatory and technical oversight
The technical information supporting this release has been reviewed and approved by R. Tim Henneberry, P. Geo (BC), a director of the company and the designated Qualified Person under National Instrument 43-101. Questcorp retains options to acquire a 100% interest, subject to royalty obligations, in both the La Union claims (totalling 2,520.2 hectares) and the North Island Copper property on Vancouver Island (totalling 1,168.09 hectares). Management emphasizes that Phase 2 is fully funded and focused on derisking targets ahead of the drill program.
The companies caution that statements regarding future plans and expectations are forward-looking and subject to risks and uncertainties, including operational, market, political and regulatory factors that could cause actual outcomes to differ materially. Readers should not place undue reliance on forward-looking statements; Questcorp disclaims any obligation to update such statements except as required by law.
Management commentary accompanying the update noted that field teams are maximizing the value of each exploration dollar by strengthening datasets, expanding target footprints where historical high-grade gold and base-metal workings exist, and using geophysics to image potential source areas at depth. These combined efforts aim to deliver a prioritized, de-risked set of drill targets for the next stage of exploration.
