NIOB Seigneurie confirms niobium mineralization in hole seven

Hole’s final assays return 842.3 ppm and 453 ppm niobium oxide over 10 and 7.3 metres plus 2,701.7 ppm copper over 3 metres Vancouver, British Columbia, July 21, 2026 (GLOBE NEWSWIRE) -- North American Niobium and Critical Minerals Corp. (CSE: NIOB) (FSE: KS82.F) (OTCQB: NIOMF) (NIOB or the Company) now has a complete picture for drill hole SGN-2026-007 at its Seigneurie Project. Final assay results show niobium oxide at grades similar to those from SGN-2026-003 over an interval that’s more than twice as long, as well as three metres of unexpected copper. “We continue to receive results that will help us understand the economic potential of Seigneurie,” said Murray Nye, NIOB’s Chief Executive Officer. “The niobium sits in the same intervals as we reported on July 3, and the copper zone deeper in the hole adds an unexpected component. At this early stage grade is not the whole story; what matters is how the niobium, copper, and rare earths are distributed and which minerals carry them, and that is the work ahead.” SGN-2026-07 highlights Niobium oxide (Nb₂O₅) : 10 m from 128.00 m to 138.00 m averaging 842.3 ppm and 7.3 m from 12.00 me to 19.30 m averaging 453 ppm Copper (Cu): 3 m from 216.50 m to 219.50 m averaging 2,701.7 ppm, almost three times the grade of the copper found in SGN-2026-003 Next steps: an automated mineralogy (TIMA) study to identify the minerals hosting the niobium and rare earths of economic interest, as the Company advances exploration across its broader Québec portfolio to prioritize the strongest targets.

Detailed discussion NIOB’s Seigneurie Project is in Québec’s Grenville Province, known for hosting a variety of rare earth element and critical minerals. This is the first time a company has applied a systematic drill program looking for rare earths or niobium to the pegmatite system at Seign