Mining companies Questcorp and Riverside Resources initiate drilling operation at the La Union Gold & Silver Project,located in Mexico.
Questcorp Mining Initiates Drilling at La Union Project in Sonora, Mexico
Questcorp Mining Inc. has commenced a drilling program at its La Union Project in northwest Sonora, Mexico. The project, which covers an area of 25 square kilometers, is host to Neoproterozoic sedimentary rocks, including limestones, dolomites, and siliciclastic sediments.
The drill program, a maiden/Phase-1 initiative, consists of 1,500 meters of diamond core drilling across six holes, each averaging 250 meters in depth. The drilling is being carried out by property vendor and operator Riverside Resources Inc.
The primary objectives of the drilling program are to expand known zones of mineralization, test new targets, and evaluate carbonate replacement deposit (CRD)-style mineralization across multiple historical mine areas. The program is the first phase of a larger C$5.5M work commitment, with an initial C$1.0M exploration budget funded by Questcorp.
Mineralization at the La Union Project occurs as polymetallic veins, replacement zones (mantos, chimneys), and shear zones with high-grade metal content. The mineralization is consistent with a CRD model, and the project shares similarities with other district CRD systems.
Specific focus areas for the drilling program include the Union Main Mine, North Union Mine, Cobre Mine, and the Central Union Area. These areas were chosen due to historical small-scale production (approximately 50,000 ounces of gold reported historically) and high-grade surface/channel samples. For instance, samples have reportedly yielded 59.4 grams per metric tonne (g/t) gold, 833 g/t silver, 11% zinc, 5.5% lead, 2.2% copper, and significant hematite and manganese oxides.
Angled drill holes are aimed at cutting perpendicular to stratigraphic targets and some structural targets. This design aims to test whether the historical shallow oxide high-grades continue at depth as sulfide replacement bodies, which could significantly alter the project's potential.
As of the most recent public reports (early August 2025), drilling has only commenced, and no drill intercept results or assay data have been released yet. Pre-drilling preparatory work completed by Riverside includes geological mapping, IP line marking, host-rock sampling for fluorescence vectoring, and rock/soil sampling to refine drill targets and better understand structural/stratigraphic controls.
The La Union Project has potential for large gold discoveries potentially above an even larger porphyry Cu district potential. The project also features high-angle normal faults and low-to-medium-angle thrust faults that sometimes served as mineralization conduits.
Anticipated near-term updates to watch for are drill completion notices, assay results for each hole, and any revisions to the work commitment or step-out holes based on initial results. These data/releases were not available in the cited sources at the time of the reports.
The technical and scientific information in the 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.
- In this drilling program at the La Union Project, Questcorp is planning to invest in exploring various historical mine areas, including the Union Main Mine, North Union Mine, Cobre Mine, and the Central Union Area, with the aim of expanding known zones of mineralization and evaluating carbonate replacement deposit (CRD)-style mineralization.
- This drilling program, the first phase of a larger C$5.5M work commitment, has been funded by Questcorp, signifying their intent to invest in the finance of the project while examining its potential for large gold discoveries.
