NorthMin reports additional barite results at project

Toronto, Ontario--(Newsfile Corp. - August 18, 2026) - Northmin Corporation (TSXV: NMB) (" Northmin " or the " Company ") is pleased to announce additional barium assay results from the first two drill holes drilled on the Tynagh mine site as part of its hard rock Ag-Cu-Zn-Pb exploration program at the 100%-owned Tynagh Project (" Tynagh "), Republic of Ireland.

Highlights:

New assays from the previously reported copper and polymetallic (Zn-Pb-Ag-Cu) intersections demonstrate that significant fine-grained barite, an EU-critical raw material, is associated with the base metal mineralization at Tynagh.

Hole 3615-26-07, which intersected a broad zone of Waulsortian reef-hosted polymetallic mineralization peripheral to the mine workings, had 27.45m grading 10.08% BaSO 4 (Barite) in addition to 0.26% Cu, 4.57% Zn+Pb, 0.06% Sb and 20.78 g/t Ag from 90.55m (reported previously). Including 10.45m grading 21.4% BaSO 4 from 90.55m.

Hole 3615-26-06 barium assays also confirm the presence of barite associated with base metals in the Waulsortion reef limestone: 3.6m grading 9.03% BaSO 4 in addition to 0.38% Cu, 2.19% Zn+Pb, 0.04% Sb and 9.62 g/t Ag from 127.0m.

3.5m grading 9.06% BaSO 4 in addition to 3.5m at 1.03% Cu, 0.17% Zn+Pb, 0.25% Sb and 15.86 g/t Ag from 150.5m.

Barite is also present in the previously unmined sub-reef Lower Muddy Limestone where high-grade copper was intersected: 6.4m grading 4.41% BaSO 4 in hole 3615-26-07 in addition to 4.92% Cu, 0.98% Sb & 62.04 g/t Ag from 149.0m reported previously.

9.15m grading 3.22% BaSO 4 in hole 3615-26-06 in addition to 0.95% Cu, 2.18% Zn+Pb, 0.14% Sb and 15.58 g/t Ag from 184.25m reported previously.

"The additional barium assays are consistent with historical mine records and the companies own 4