NIOB Seigneurie confirms heavy rare earth mineralization

First results from SGN-2026-007 return modest grades of 76.7 ppm dysprosium oxide over 10.00 metres and 528 ppm heavy rare earth oxide over 32.20 metres Vancouver, British Columbia, July 03, 2026 (GLOBE NEWSWIRE) --  There’s still work to be done to determine whether North American Niobium and Critical Minerals Corp.’s (CSE: NIOB) (FSE: KS82.F) (OTCQB: NIOMF) (NIOB or the Company) Seigneurie system hosts rare earth or niobium mineralization of economic interest. Initial laboratory results from the project, located in Québec’s Grenville Province, validated the Company’s approach to targeting rare earth and niobium mineralization, with drill holes yielding early-stage modest grades. “This is a good result from Seigneurie: we’ve shown that the pegmatite carries niobium and rare earth mineralization that includes dysprosium,” said Murray Nye,  Chief Executive Officer. “Although modest, this discovery paired with a higher grade intercept in the vicinity could change the perspective of the whole property. We’re going to continue with the planned, systematic exploration of our Québec portfolio before determining our next steps at this strategic asset.” Highlights Dysprosium oxide: hole SGN-2026-007 returned 10 m averaging 76.7 ppm dysprosium oxide (Dy₂O₃).

Heavy rare earth oxide: the hole returned 32.20 m averaging 528 ppm heavy rare earth oxide (HREO), a near-surface interval that is predominantly yttrium oxide (approximately two-thirds of the reported HREO). Mineralization confirmed, grades modest: results confirm niobium and rare earth mineralization within approximately 105.45 m of the Seigneurie pegmatite, at early-stage grades that require further work to assess economic potential. Mineralogy underway: samples were analyzed by SGS Canada Inc.; an automated mineralogy (TIMA) study is in progress to deter