Mr. Thomas Lamb reports

J2 METALS IDENTIFIES THREE NEW HISTORIC MINING WORKINGS AT ITS SIERRA PLATA PROJECT, ZACUALPAN-TAXCO DISTRICT, MEXICO

J2 Metals Inc. has identified three historic mine workings, El Samano, El Chinicuil and El Cedro Rojo, as part of the initial field program at its Sierra Plata project located in Guerrero state, Mexico. The discoveries were made by project geologists during the period of May 19 to May 31, 2026, under the direction of country manager Carlos Cham.

Chief executive officer of J2, Thomas Lamb, commented: "The pace of discovery at Sierra Plata is exactly what we expected from a district with this much historical production and so little systemic modern exploration: six long-forgotten mining workings identified in the first two weeks of fieldwork. With 53 samples now at the lab and only 250 of 2,200 hectares mapped, we're still in the very early innings of understanding Sierra Plata."

Discovery highlights

As of May 31, 2026, the geology team has located a total of six historic mining workings within the Sierra Plata project area, three of which are being highlighted in this release.

El Samano mine

Located at UTM co-ordinates 421723E/2058377N, El Samano comprises approximately five metres of underground development hosted in black shale. A float sample recovered from outside the mine entrance revealed a vein fragment carrying white quartz, calcite and amethyst quartz with visible polymetallic sulphides -- an early stage indicator of potential base and precious metal mineralization.

El Chinicuil mine

Located at UTM co-ordinates 421193E/2058179N, El Chinicuil is currently a collapsed mine. A hand sample collected at the site revealed a quartz-calcite vein with polymetallic sulphides consistent with the mineralization style observed elsewhere on the property. The company intends to reassess the structure for safe re-entry in future field programs.

El Cedro Rojo mine

Located at UTM co-ordinates 421562E/2056410N, El Cedro Rojo is capped with overburden and unable to be entered. J2 plans to revisit and evaluate the feasibility of safely uncovering and sampling the workings at a subsequent time.

Sampling and geological mapping

In aggregate, 53 rock samples have been collected from the six identified mine workings and surrounding surface exposures. In addition, four quartz veins with iron oxide mineralization have been identified on surface. Laboratory results are pending and the company will provide further commentary on the significance of the vein structures upon receipt.

Geological mapping has now covered approximately 250 out of 2,200 hectares of the project area, identifying three distinct lithological units: limestone, sandstone and black shale. Oxidation zones have also been mapped and are being correlated with the locations of historic workings and surface vein occurrences.

Next steps

The field team will continue systematic location and sampling of historic mining structures across the remainder of the project area, while advancing geological-structural mapping and alteration studies. Priority next steps include reassessment of covered mine workings (including El Chinicuil and El Cedro Rojo) for safe access, dewatering of the second level at El Sabino mine, and receipt and interpretation of geochemical assay results from the 53 samples submitted to date.

Qualified person

The technical content of this news release has been reviewed and approved by Graham Giles, PGeo of J2, a qualified person as defined under National Instrument 43-101 -- Standards of Disclosure for Mineral Projects.

About the Sierra Plata project

The Sierra Plata project is a 2,203-hectare silver-gold-antimony exploration project situated within Zacualpan, one of the most important historically productive epithermal mining districts in Mexico and includes five past-producing high-grade mines localized along regionally extensive, structurally controlled vein corridors. Recent sampling of waste dumps at Sierra Plata returned grades of up to 3,932 grams per tonne AgEq (silver equivalent). Mineralization is hosted in quartz-dominant vein systems containing fine-grained sulphides with associated gold and antimony, reflecting a low to intermediate epithermal system with strong vertical metal zoning. Alteration assemblages, vein textures and metal associations observed at surface are consistent with upper-level exposure of the epithermal system, with historic mining largely confined to near-surface levels. The company anticipates identifying a large number of high-priority targets for drill evaluation.

About J2 Metals Inc.

J2 Metals is a multicommodity explorer advancing silver, gold and antimony projects with historical production or significant drill results across established mining jurisdictions in Mexico, Quebec and Alaska. At Sierra Plata in Zacualpan, Mexico, one of the most historically productive epithermal districts in the country, recent waste dump sampling has returned grades of up to 3,932 g/t AgEq across five past-producing silver-gold mines. Active geological mapping and drill permitting are under way. At the miniac project in Quebec's Abitibi greenstone belt, a newly completed 41-kilometre OreVision IP survey has identified prospective chargeability and resistivity anomalies coincident with previously identified EM targets, supporting a planned phase II drill program of up to 5,000 metres across a largely untested seven-kilometre conductive horizon.

At the Napoleon project in the Fortymile district of Alaska, a prolific placer camp with up to one million ounces of historical gold production, rock-chip samples have returned up to 596 g/t gold, with historical drilling by Teck and Kennecott reporting intercepts of 8.9 g/t gold over three metres and 0.9 g/t gold over 79 metres.

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