ATHA Discovers Athabasca-Style High-Grade Mineralization at Rib East
ATHA DISCOVERS ATHABASCA-STYLE HIGH-GRADE
MINERALIZATION AT RIB EAST
HIGHLIGHTS
• First three drill holes completed at RIB East Discovery successfully targeted stacked gravity,
EM and structural anomalies (Figure 2), and intersected uranium mineralization, as part of
the 2025 Angilak Exploration Program comprising 10,000 m of diamond drilling (Figure 1);
• Results represent the second new discovery of uranium mineralization – beyond the Lac 50
Deposit Trend – during the 2025 Angilak Exploration Program , within the Angikuni Basin
along the 31 km RIB-Nine Iron Trend;
• Mineralization at RIB East Discovery is currently defined by three drill holes, all intersecting
shallow uranium mineralization (< 275 m depth ), over a currently defined strike length of
400 m (Figure 2). The RIB East Target anomaly is defined by a 2 km long by 500 m wide
gravity anomaly coincident with a NE to SW conductive trend.
• RIB East Discovery Drilling Highlights:
o RIBE-DD-002, intersecting shallow high -grade uranium mineralization as well as
numerous zones of lower -grade mineralization throughout the hole. The hole
intersected total composite mineralization of 9.4 m, including a continuous shallow
zone (between 210.9 m and 212.5 m) of 0.3 m of high-grade mineralization that had
max radioactivity up to 16,947 CPS1 (Figure 3a, b & 5);
o RIBE-DD-003, intersecting total composite mineralization of 2.1 m with continuous
shallow mineralization over 1.5 m interval (276 m to 277.5 m) within a graphitic
shear – analogous to uranium mineralization controls seen in Athabasca Basin
deposits and mines – including continuous high-grade mineralization (>10,000 CPS)
over a continuous 1.0 m with max radioactivity of 30,730 CPS1 (Figure 3a, b & 6) and
a lower grade mineralized fracture intersected between 372 m and 372.6 m. RIBE-
DD-003 was drilled 200 m along strike of RIBE -DD-002 and 150 m further into the
hanging wall of an interpreted NW trending fault zone.
• Both the KU and RIB East Discoveries are a result of t he May 2025 ground gravity and
electromagnetic (EM) survey, which targeted the 31 km Rib-Nine Iron Trend and has defined
numerous prospective targets along the RIB-Nine Iron Trend;
• Also identified by the May survey was RIB West, highlighted by two large gravity anomalies.
The first, is 900 m long by 250 m wide, coincident with a highly conductive structural corridor
that hosts the historic RIB Discovery. The second is 1.1 km long by 300 m wide, extending
from the margin under the cover of the basin, and has yet to be drill tested;
• The 2025 Angilak Exploration Program will continue to target expansion of the mineralized
footprint at the Lac 50 Deposit and the continued discovery of additional regional targets
along the RIB-Nine Iron Trend.
Troy Boisjoli, CEO commented: “ The RIB East Discovery represents the secon d new discovery (first
being KU Discovery) during the 2025 Angilak Exploration Program, beyond the Lac 50 Deposit Trend in
the Angikuni Basin. These results continue to confirm the Company’s exploration approach and thesis,
while demonstrating our technical team’s ability to execute and discover. The Company is thrilled with
the fact that the RIB East Discovery has high-grade mineralization hosted within a graphitic structure
– a known setting for mineralization in all major Athabasca Basin deposits and mines. We are at the
early stages of understanding the potential of RIB East, with drilling covering just 400 m of a 2 km long
anomaly. The early successes of the 2025 Angilak Exploration Program truly illustrate how
underexplored and robust the mineralizing system is in the Angikuni Basin.”
Cliff Revering, VP Exploration added: “The success of our first 3 holes in the RIB target area continues
to demonstrate the effectiveness of our targeting strategy being employed at our Angilak Project. As
well, with new discoveries at both the KU and RIB targets during our first exploration campaign along
the 31 Km Rib-Nine Iron structural corridor, we remain confident in our view that the Angikuni Basin is
an emerging uranium district and highly prospective for discovery of additional uranium deposits.”
Vancouver, British Columbia, July 21st, 2025 – ATHA Energy Corp. (TSX.V: SASK) (FRA: X5U) (OTCQB:
SASKF) (“ATHA” or the “ Company”), is pleased to ann ounce results for the first t hree diamond drill
holes completed at the RIB East target as part its 2025 Angilak diamond drill exploration program at
its 100% -owned Angilak Uranium Project, Nunavut. The maiden drill hole at RIB East Target
intersected six zones of uranium mineralization, totaling 5.9 m of composite mineralization (Figures
3a, b & 4). The second hole was designed to test 200 m along strike to the southwest of RIBE-DD-001,
where the hole intersected broader zones of uranium mineralization . These include a shallow
continuous (210.9 m to 212.5 m) zone with high-grade mineralization over 0.3 m with maximum
readings of 16,947 CPS1. The third drill hole, RIBE-DD-003, was a 150 m step back by 200 m along strike
test of a parallel stacked gravity-EM anomaly. The hole intersected composite mineralization of 2.1 m
with continuous shallow mineralization over a 1.5 m interval, including a 1.0 m continuous high-grade
(>10,000 CPS) and a lower grade fracture intersected at 372 m . RIB East is currently defined by 2-km
long by 500 m wide gravity anomaly with coincident NE to SW conductors. RIB East is located ~1.5 km
within the Angikuni Basin and ~2 km to the northeast of the historic RIB Discovery.
Figure 1: Angilak Project Area – 2025 Exploration Target Area (Black Rectangles) & Mapped Historic
Figure 2: 2025 Angilak Exploration Program – RIB East Discovery Drill Collar Locations
Table 1: 2025 Angilak Exploration Program Drill Collar Information
Hole ID Trend Zone Azimut
h (°)
Dip
(°)
Easting
(mE)
Northing
(mN)
Elevation
(m)
Final
Depth (m)
RIBE-DD-
001
RIB-Nine
Iron
RIB
East 145 -55 497928 6929449 270 443
RIBE-DD-
002
RIB-Nine
Iron
RIB
East 145 -55 497766 6929322 271 345
RIBE-DD-
003
RIB-Nine
Iron
RIB
East 145 -63 497524 6929337 271 398
Figure 3a: RIB East Long-Section denoting intersections of mineralization across multiple zones, showing
radioactivity based on 40TGU-1000 Triple Gamma Down Hole Probe1.
Figure 3b: RIB East Cross-Section denoting intersections of mineralization across multiple zones, showing
radioactivity based on 40TGU-1000 Triple Gamma Down Hole Probe1.
Figure 4: Striplog RIBE-DD-001 showing radioactivity based on 40TGU-1000 Triple Gamma Down Hole
Probe1.
Figure 5: Striplog RIBE-DD-002 showing radioactivity based on 40TGU-1000 Triple Gamma Down Hole
Probe1.
Figure 6: Striplog RIBE-DD-003 showing radioactivity based on 40TGU-1000 Triple Gamma Down Hole
Probe1.
Down Hole Gamma Probe
1.A Mount Sopris 40TGU-1000 Triple Gamma Geiger down hole probe was utilized for radiometric
surveying. The total gamma results provided were selected using a n average cutoff of 500 CPS over