Bunker Hill Mining confirms discovery of high-grade silver-lead veins at Bunker Hill Mine, Idaho

Bunker Hill Mining Corp. [TSX: BNKR; OTCQB: BHLL] reported additional assay results from the ongoing underground exploration drill program on the Cate-Eight Vein Target at the Bunker Hill Mine, Idaho. This program is designed to test high-grade silver targets near recently constructed mine infrastructure in the upper area of the mine, with the potential to be incorporated into the near-term production plan and expand the current mineral resources and mineral reserves.

Drillhole BHE26-02 returned continuous mineralization over 28.6 feet grading 3.02 oz/ton (103.39 g/t) silver, 7.44% lead and 0.85% zinc (173.5 g/t AgEq) starting at 453 ft downhole, including 17.1 feet at 4.19 oz/ton (143.64 g/t) silver, 10.67% lead and 0.73% zinc (238.05 g/t AgEq).

Two distinct high-grade galena-siderite veins cut within a 17.1-foot mineralized zone:  2.1 feet at 7.95 oz/ton (272.6 g/t) silver, 22.18% lead and 1.05% zinc (462.97 g/t AgEq) and 4.3 feet at 8.84 oz/ton (303.1 g/t) silver, 23.20% lead and 0.73% zinc (497.59 g/t AgEq).

Highlights – Drillhole BHE26-02: Discovery of two high-grade silver-lead veins (galena-siderite) within a 28.6-foot mineralized zone near existing underground infrastructure.

Mineralization remains open in all directions and occurs within 40 feet of existing mine development, highlighting significant near-mine expansion potential in the underexplored upper mine area.

Extends known mineralization approximately 340 feet up-dip from intercepts reported in BHE26-01.

Initial target interpretation suggested a single vein; drilling has now identified broader mineralized intervals with an approximate thickness of 10–15 feet.

The program remains on schedule, with approximately 1,250 feet drilled to date as part of the planned 25,000-foot campaign.

The ongoing drill hole, BHE26-03 has intersected additional mineralization in projections of the new veins and is currently being logged and sampled.

“These second set of results indicate the emergence of a new high-grade silver-lead zone in an area of the upper mine that has seen limited historical exploration,” said Sam Ash, CEO of Bunker Hill Mining. “What is particularly encouraging is the potential scale indicated by these early holes, with mineralization open in all directions and extending well beyond historic interpretations.”

The “Cate-Eight Vein” is the first target to be tested in the 2026 exploration drill program. This target was previously intercepted by three historic drill holes in the mid-1970s as part of a strategic geological survey, but these were not followed up on before the mine closed. It is interpreted as a vein segment offset within the Cate Fault Zone.

The Cate-Eight Vein is considered to belong to the silver-rich Galena-Quartz (GQ) series of veins, previously mined on the lower levels of the Bunker Hill Mine. This group of veins was historically underexplored and largely unexploited in the upper levels of the Mine and represents highly attractive, potentially high-grade silver exploration targets adjacent to mine infrastructure, which could be brought into the near-term mine plan.

BHE26-02 is the second hole drilled into the Cate-Eight target, intersecting 28.6 feet of continuous galena mineralization starting at 453 feet downhole. A 17.1 foot-thick higher-grade zone within this broader interval grades 4.19 oz/ton silver (143.64 g/t), 10.67% lead and 0.73% zinc (238.05 g/t AgEq). Two distinct high-grade galena-siderite veins were cut within the 17.1-foot mineralized zone; 2.1 ft at 7.95 oz/ton silver (272.6 g/t), 22.18% lead and 1.05% zinc (462.97 g/t AgEq) and 4.3 feet at 8.84 oz/ton silver (303.1 g/t), 23.20% lead and 0.73% zinc (497.6 g/t AgEq).

The first hole into the Cate-Eight target (BHE26-01) intercepted 52.3 feet of continuous visible galena mineralization (silver-bearing lead sulfide) starting at 154 feet downhole, with two distinct veins from 163.7-184.2 feet and 203-206.3 feet, both of which had internal zones of high-grade silver-lead mineralization (0.8 feet at 11.9 oz/ton silver (408 g/t) and 29.3% lead (642.68 g/t AgEq) and 2.3 feet at 11.1 oz/ton silver (380.57 g/t) and 28.4% lead (607.93 g/t AgEq)).

The results confirm and extend mineralization beyond historic drill intercepts and support modelling of historic mapping and drill data, showing a mineralized structure (Cate-Eight) that may be included in future mine plans with continued encouraging drill intercepts.

Six drillholes are planned to test the Cate-Eight Target, totalling ~2,200 feet. The third hole (BHE26-03) was completed on May 7, 2026, ending in historic mine workings after cutting a mineralized vein and breccia zone. BHE26-03 is currently being logged with samples highlighted for delivery to the Silver Valley Laboratory (SVL Lab) in the second week of May 2006.

Three additional drillholes will test the emerging Cate-Eight Vein zone from the current drill station on the 8 Level.

Bunker Hill Mining is a U.S.-based exploration and development company focused on the restart of its flagship asset—the historic Bunker Hill Mine in northern Idaho’s prolific Coeur d’Alene mining district.