Exploration Indicators at Seigneurie
LEGAL_49404157.2
NIOB Intersects 211+ Metres of Cumulative Pegmatite with
Encouraging Nb-REE Exploration Indicators at Seigneurie; Assays
Pending
Includes a continuous 105.45-metre central pegmatite interval; laboratory assays
and mineralogical confirmation pending
Vancouver, British Columbia - April 29, 2026 - North American Niobium and Critical Minerals Corp.
(CSE: NIOB) (FSE: KS82.F) (OTCQB: NIOMF) (NIOB or the Company) has drilled a pegmatite
intersection that ranks 4th among the widest pegmatite drillhole intersections ever publicly disclosed (see
Tables 1 and 2) , at its Seigneurie project in Québec. SGN 2026-007 intersected 211.25 metres of cumulative
pegmatite, anchored by a continuous 105.45-metre core interval that displayed elevated radiometric response
and qualitative Portable XRF (pXRF) indicators that the Company considers encouraging for potential
niobium (Nb) and rare earth element-bearing (REE) minerals. Laboratory assays are currently pending. These
early results support continued geological modelling and follow -up work to assess the geometry and
continuity of the pegmatite system at depth.
Highlights
• Widest single pegmatite intercept reported to date at Seigneurie: continuous 105.45-metre main interval
from 63.85 to 169.3 metres within 211.25 metres of cumulative pegmatite in drill hole SGN-2026-007 (see
Figure 1)
• Sustained elevated gamma-ray spectrometer response across the main pegmatite is considered by the
Company to be an encouraging qualitative exploration indicator for potential REE and Nb mineralization
• Light-brown mineral in direct association with magnetite returned elevated niobium, yttrium and
phosphorus on portable XRF screening (indicative only; see pXRF disclosure below and Figure 3)
• Core alteration and mineralogy appear more pronounced than at surface—smoky-quartz and titanium
(Ti)-magnetite content exceeds what was documented in the Channel 2 outcrop, the best surface channel-
sample interval at Seigneurie to date. The Company believes that this suggests the hole is testing a more
developed part of the pegmatite system
• Quartz and magnetite are spatially associated with Nb-REE-bearing phases—a priority observation
for laboratory petrography, as confirmation of this association would strengthen the case for a magnetite-
hosted Nb-REE target
The next step will be to do petrography and mineralogy on selected intervals, including the main 105.45-metre
interval and the light-brown mineral associated with magnetite, to confirm the niobium-yttrium, phosphorus-
bearing phase. If laboratory assays and mineralogical studies confirm the presence and distribution of Nb-
REE-bearing phases associated with titanium -magnetite, the Company may evaluate whether magnetic
separation or other processing methods could be relevant in future studies. No metallurgical testing has been
completed. The Company also notes that Seigneurie is approximately 1 kilometre west of the St. Lawrence
River, that pegmatite outcrops at surface, and that a Hydro-Québec power line is located near the prospect.
These infrastructure observations are preliminary and do not imply economic viability, development potential,
permitting certainty or access to power.
LEGAL_49404157.2
Figure 1: SGN-2026-007 drill core laid out on site showing red-pink granitic pegmatite intervals. The hole
intersected 211.25 metres of cumulative pegmatite over 290 metres, including a continuous 105.45- metre
interval from 63.85 metres to 169.30 metres.
LEGAL_49404157.2
SGN-2026-007 DRILL HOLE SUMMARY
The Seigneurie property lies within Qu ébec’s Grenville Province and is a focus of the Company’ s 2026
exploration campaign for niobium-rare earth element-bearing pegmatite systems. SGN-2026-007 is part of a
north-south drill fence targeting the Seigneurie pegmatite system at depth (see Figure 4).
SGN-2026-007 Shows Nb-REE Indicators
The intersected pegmatite is a red to pink granitic pegmatite with variable concentrations of smoky quartz and
disseminated magnetite.
The continuous central zone, a 105.45-metre pegmatite interval from 63.85 to 169.3 metres, is associated with
gamma-ray spectrometer peaks (of up to approximately 1,400 counts per second) that have smoky-quartz-rich
intervals and titanium-rich magnetite minerals within the main pegmatite. A light-brown mineral observed in
direct association with magnetite returned elevated niobium, yttrium, and phosphorus on portable XRF
screening; the combined gamma-ray spectrometer response and pXRF are considered by the Company to be
encouraging qualitative indicators for potential niobium and rare earth mineralization. Samples have been
submitted to the laboratory and assays are pending.
Core logging identified a light -brown mineral assemblage, shown in Figure 3, occurring in close spatial
association with t itanium-rich magnetite grains. The light -brown mineral assemblage returned notable
portable XRF peaks in niobium, yttrium, phosphorus, and zirconium.
Host rocks between pegmatite intervals include biotite gneiss, pink gneiss, and amphibolite. True widths have
not yet been determined and will be estimated once the geological model is updated with the remaining drill-
hole data.
SGN-2026-007 Points to Potential Indications of Niobium-Rare Earth System at Depth
The strongest surface results reported to date from the Seigneurie project have been associated with
radiometric anomalies. Channel 2, previously disclosed as the Company’s best surface channel -sample
interval at Seigneurie, returned anomalous dysprosium, hafnium, zirconium, and niobium.
The Company reviewed results from the channel samples and found that the radiometric elements uranium
and thorium occur together with niobium and heavy rare earth elements. This suggests that elevated gamma-
ray readings may help guide the Company toward prospective niobium -rare earth mineralization at
Seigneurie.
Drill hole SGN-2026-007 records sustained elevated radiometric response, together with stronger alteration
and higher smoky- quartz–magnetite content than observed at surface in Channel 2. In the Company’s
interpretation, these features suggest the hole may be testing a more mineralized part of the system, with
potential for higher grades pending laboratory assays.
LEGAL_49404157.2
Portable XRF Disclosure
Portable XRF (pXRF) data referenced in this release were collected with a hand-held instrument on drill core
as a logging aid and qualitative screening tool. pXRF readings are indicative only and are not accepted as
quantitative results for mineral disclosure purposes. No pXRF concentrations have been published in this
news release. Quantitative geochemical results will only be reported following laboratory assay and review
against CRM, blank and duplicate quality-assurance data.
Figure 2: Representative core from the main 105.45 metre pegmatite interval (approximately 122 to 125
metres)—red-pink granitic pegmatite with coarse quartz and Ti-magnetite clusters along with K-Feldspars.
LEGAL_49404157.2
Figure 3. Macro (hand-lens) close-up of a polished core face from the main pegmatite interval, showing light
brown minerals in direct association with magnetite. Portable XRF screening of this assemblage returned
qualitative indications of elevated niobium, yttrium, phosphorus, and zirconium; the light-brown mineral
coincides with the strongest gamma-ray spectrometer response logged on core. pXRF indicative only; see
pXRF disclosure.
LEGAL_49404157.2
Figure 4. Plan view of hole SGN-2026-007. The hole was designed to test the hill where a radiometric
anomaly was identified back in the 1970s by SOQUEM. See Figure 5 for cross section of hole SGN-2026-
007.
LEGAL_49404157.2
Factual Basis for the Comparative Ranking
The Company believes that drill hole SGN-2026-007’s 211.25 m cumulative pegmatite intersection ranks
among the longest publicly disclosed drillhole intersections globally for Nb- REE-bearing systems. The
metric used is total cumulative downhole length of mineralized host rock intersected within a single drill
hole, as reported by the operator in publicly available press releases or technical disclosures. Seigneurie is
referred to herein as a pegmatite system with Nb -REE-bearing minerals; no Mineral Resource has been
estimated and Seigneurie is not classified as a deposit. The peer set reviewed by the Qualified Person is
presented in two tables below: (i) Nb-REE-bearing peers, which include both pegmatite-hosted and alkaline-
intrusion-hosted Nb- REE systems and are the geologically and geochemically closest analogues to
Seigneurie, and (ii) LCT (lithium-cesium-tantalum) pegmatite projects, shown for additional context across
pegmatite deposit types. Only the longest publicly disclosed drillhole intersection per project is shown.
Table 1. Nb-REE-bearing peer projects (pegmatite and alkaline intrusion hosts)
Project Operator /
Country
Hole ID Length
(m)
Grade Deposit Type Source
Tanbreez
(Hill)
Critical Metals
Corp. /
Greenland
DX-01 338.0 0.42% TREO
(incl. ~24%
HREO)
Kakortokite
(alkaline
intrusion)
Critical Metals Corp
NR, Mar 17, 2025
Norra Kärr Tasman Metals /
Leading Edge
Materials /
Sweden
NKA
11039
264.4 0.55% TREO,
1.72% ZrO2
Peralkaline
nepheline
syenite
(alkaline
intrusion)
Tasman Metals NI
43-101 NR, Jan 2012
Seigneurie NIOB / Quebec,
Canada
SGN-2026-
007
211.25 Assays pending
(2026)
Pegmatite
with Nb-
REE-bearing
minerals
This release
Motzfeldt
(Aries)
Alba Mineral
Resources /
Greenland
PSRK-014 192.5 0.185% Nb2O5,
0.012% Ta2O5,
0.260% TREO,
0.460% ZrO2
Peralkaline
microsyenite
(alkaline
intrusion)
Alba Mineral
Resources RNS, 2024
Two Tom Rare Earth
Metals Inc. /
Labrador,
Canada
TT-15b 175.5 1.68% TREO,
0.21% Nb2O5,
0.19% BeO
Peralkaline
syenite
(alkaline
intrusion)
Rare Earth Metals
NR, Nov 16, 2011
Strange Lake
B
Quest Rare
Minerals Ltd. /
Quebec-
Labrador,
Canada
BZ11218 144.4 1.44% TREO Peralkaline
granite
(alkaline
intrusion)
Quest Rare Minerals
NR, Jan 12, 2012
Crater Lake
(TG)
Imperial Mining
/ Scandium
Canada /
Quebec, Canada
CL22057 98.6 308 g/t Sc2O3,
0.326%
TREO+Y
Ferrosyenite
(alkaline
intrusion)
Imperial Mining NR,
Nov 17, 2022
LEGAL_49404157.2
Table 2. LCT pegmatite projects (context)
Project Operator /
Country
Hole ID Length
(m)
Grade Deposit Type Source
Cisco Q2 Metals Corp.
/ Quebec,
Canada
Hole 44 457.4 1.65% Li2O LCT
pegmatite
Q2 Metals NR, Dec
3, 2025
Manono AVZ Minerals
Ltd. / DRC
MO18DD009 341.62 1.54% Li2O,
875 ppm Sn
LCT
pegmatite
Australian Mining,
Jun 28, 2018
Spark Frontier Lithium
Inc. / Ontario,
Canada
PL-048-21 340.7 1.68% Li2O LCT
pegmatite
Frontier Lithium NR,
Jun 1, 2021
Seigneurie NIOB / Quebec,
Canada
SGN-2026-
007
211.25 Assays pending
(2026)
Pegmatite
with Nb-
REE-bearing
minerals
This release
Greenbushes IGO Ltd. /
Talison Lithium
/ Western
Australia
CLDD080 193.3 2.0% Li2O LCT
pegmatite
IGO Greenbushes
CY23 R&R, Feb 19,
2024
Corvette
CV5
Patriot Battery
Metals Inc. /
Quebec, Canada
CV24-704 186.0 1.08% Li2O
(incl. 11.3 m at
4.27%)
LCT
pegmatite
Patriot Battery
Metals NR, Feb 27,
2025