On April 7th, 2026, Prismo Metals Inc. announced the completion of its Phase I diamond drilling at the Silver King project, situated in the Pioneer Mining District close to Superior, Arizona. The property sits within a historic district first mined in 1875 and produced nearly 6 million ounces of silver in earlier times (historic, non-NI 43-101 compliant data). The project lies approximately 3.4 km from the main shaft of the Resolution Copper joint venture, which highlights the strategic nature of the land position bounded by major claim blocks.
The initial program comprised eight diamond drill holes totaling 1,272 metres of core. Seven holes targeted the upper, historically mined portions of the pipe-like Silver King system while one deep hole, SK-26-07, tested the down-plunge extension to roughly 1,600 ft (488 m). Near-surface intervals returned abundant quartz veining and visible silver-bearing sulfides, whereas the deep test intersected a previously unrecognized intrusive with potassic alteration and disseminated sulfides — features that are typically associated with porphyry-style systems rather than the shallower epithermal veins that dominate the historic workings.
Table of Contents:
Phase I drilling results and observations
The drill campaign successfully hit the targeted vein and stockwork architecture in every hole, validating the Company’s 3D model of the old workings. Visual logging and handheld XRF showed classic epithermal-style quartz‑barite veins and stockworks containing silver-rich minerals such as freibergite, stromeyerite, acanthite and native silver, accompanied by base-metal minerals like bornite, chalcopyrite, sphalerite and galena. The deep hole SK-26-07 transitioned into a quartz monzonite intrusive with widespread secondary biotite, K‑feldspar alteration and disseminated pyrite, locally carrying chalcopyrite and pyrrhotite — assemblages more typical of higher-temperature hydrothermal systems.
Drill hole highlights and program summary
The eight-hole program included varied azimuths and inclinations to test both the mined pipe and its immediate host rocks; cumulative footage equaled 4,173 ft (1,272 m). While seven shallower holes focused on the historically mined envelope, the single deep test provided the first direct evidence of a deeper, higher-temperature zone on the property. Visual core photos illustrate vein textures and alteration styles encountered. Laboratory assays for samples from five holes have been sent for analysis, with remaining submissions from SK-26-06 to SK-26-08 completed shortly after drilling finished. Final assay results were expected in May 2026.
Regional context and geological interpretation
The alteration sequence observed — from shallow silver‑bearing epithermal veins upward to deeper potassic alteration downward — suggests a vertically zoned hydrothermal system, where near-surface epithermal mineralization overlies a potential porphyry source. Such a relationship echoes regional examples like the historical Silver Queen/Magma transition and the large-scale Resolution Copper deposit found nearby. The property exposes multiple intrusive phases including syenite, quartz monzonite and granodiorite within an erosional embayment, supporting an interpretation of telescoped hydrothermal activity with a possible hypogene Ag‑Cu core at depth or laterally adjacent to the Silver King pipe.
Next steps, technical program and expert appointment
Prismo plans follow-up work to refine targets before a Phase II drill campaign. Planned activities include downhole geophysics, petrographic thin-section studies to confirm mineral paragenesis, expanded multi-element geochemical sampling, and detailed structural and alteration mapping across the embayment. To support these efforts, Prismo appointed Dr. Linus Keating as Special Advisor; Dr. Keating brings decades of global exploration experience, including assignments with Rio Tinto and discoveries in porphyry systems. His expertise in advancing early-stage data sets toward drill-ready targets will guide the team as they interpret the new potassic signatures and plan targeted step-outs.
Quality control and regulatory notes
Company notes emphasize that handheld XRF observations are qualitative and not a substitute for laboratory assays; commercial standards were used during XRF work. The technical disclosures were reviewed and approved by Dr. Craig Gibson, Ph.D., CPG, the Company’s Chief Exploration Officer and a Qualified Person under NI 43-101. Historical production figures and selected historic sample results are cited for context but are non-NI 43-101 and have not been independently verified by Prismo. Readers should treat forward-looking comments and interpretations as subject to the usual geological and market risks.