Drilling campaign doubles Cate-8 discovery target size

Intersects Highest Grades Yet With 8.1 Feet at 18.82 oz/ton Silver in BHE26-16, Individual Samples to 27.1 oz/ton Silver, 35.7% Lead, 15.7% Zinc Targeting Initial Cate-8 Resource Estimate by Year-End 2026 KELLOGG, Idaho and VANCOUVER, British Columbia, July 15, 2026 (GLOBE NEWSWIRE) -- Bunker Hill Mining Corp. (“ Bunker Hill ” or the “ Company ”) ( TSX: BNKR | OTCQB: BHLL ) is pleased to announce additional assay results from its ongoing underground exploration drilling program in the upper part of the Bunker Hill mine (the “ Bunker Hill Mine ”), including individual sample grades up to 27.3 oz/ton silver, 35.7% lead and 15.7% zinc, with combined silver-equivalent metal grades up to 32.9 oz/ton or 1,128 g/t AgEq (see below for calculations). “As we progress towards expected commercial production by the end of 2026, we are increasingly excited by the results of the 21 holes drilled to date. The continuity and scale of mineralization encountered is beyond the boundaries of the existing resource footprint,” said Sam Ash, President and Chief Executive Officer of Bunker Hill Mining. “From here, additional drilling will be required, as we aim to establish an additional zone of mineralization that can supplement the current production profile, and we believe that the success achieved to date positions us well to deliver an initial resource estimate before year-end, with the potential for inclusion in our production plan and full-year guidance for 2027.” New drill results continue to demonstrate silver-lead grades and thicknesses in siderite-galena (sphalerite) veins comprising the Cate-8 Vein Target (the “ Cate-8 Target ”). These are expected to support the completion of an initial mineral resource estimate for the zone by the end of 2026.

Geologic modeling of the drill results has shown the Cate-8 Target is a different hy