Midnight Sun expands Dumbwa strike to 6.7 km copper mineralization

Highlights include: 21.64m @ 0.42% Cu, 13.67m @ 0.51% Cu, and 25m @ 0.38% Cu VANCOUVER, British Columbia, June 29, 2026 (GLOBE NEWSWIRE) -- Midnight Sun Mining Corp. (TSXV: MMA / OTCQX: MDNGF) (“Midnight Sun” or the “Company”) is pleased to report additional results from 77 holes on its wholly owned Dumbwa copper deposit, located in Solwezi, Zambia. Drilling has now surpassed 260 holes and 56,855 metres ("m"), confirming continuous near-surface sulphide copper mineralization over 6.7 kilometres ("km") of strike at Dumbwa. Five drill rigs continue to expand the deposit northward along strike and laterally to the east and west of known mineralization.

Highlights of Drilling include: DBW-26-200 intercepted 0.42% Cu over 21.6m . DBW-26-165 intercepted 0.51% Cu over 13.7m . DBW-26-150 intercepted 0.38% Cu over 25.0m .

Midnight Sun’s President and CEO, Al Fabbro, states, "To date, we have demonstrated that Dumbwa is, at a minimum, a 6,700 metre long and 600 metre to 1,000 metre wide, north-south, strain-controlled copper system.  It is typically near, or at, surface, and extends to greater than 200 metres depth. It features a high-grade, central corridor ranging in width from 100 to 600 metres within a broader mineralized shell which can exceed 1,000 metres in width. Our initial, discovery drilling is broadly spaced with holes positioned 50 to 100 metres apart on each of the east-west lines, with the lines spaced 100 to 200 metres apart north to south.

As a result, on any individual line/section, it is expected that only 2 or 3 holes are positioned within the highest-grade corridor, while a higher percentage of holes are positioned in the lower-grade shells. It is evident from our work to date; the higher-grade core shows strong grades and continuity within individual segments of the deposit. As our drilling has pro