Selkirk Copper Expands Mineralization at Four Resource Zones at the Minto Copper- Gold-Silver Mine
Selkirk Copper Expands Mineralization at Four Resource Zones at the Minto Copper-
Gold-Silver Mine
Highlights
• Drilling at Minto North continues to delineate high-grade mineralization, which remains open to the north
and south:
o 2.26% Cu, 2.23 g/t Au and 10.39 g/t Ag (4.0% CuEq) over 8.1 m, within a broader zone of 1.33%
Cu, 0.97 g/t Au and 5.48 g/t Ag (2.1% CuEq) over 29.7 m from 197 m in drill hole 25SCM080.
• Drilling at Minto East intersected multiple stacked mineralized lenses in a 90 m step-out from previous
drilling, and remains open for further expansion in east, west and north directions: The deepest
mineralization intersected returned notable high-grade copper, gold and silver grades:
o 2.45% Cu, 1.18 g/t Au, and 8.44 g/t Ag (3.4% CuEq) over 5.8 m, from 484 m in drill hole
25SCM082.
• At the Ridgetop and 118 zones, where shallow mineralization supports potential open pit development,
drilling continues to expand mineralization beyond previously defined limits:
o At Ridgetop, 0.64% Cu, 0.24 g/t Au, and 2.62 g/t Ag (0.84% CuEq) over 30.4 m, from 38 m
depth, in drill hole 25SCM065.
o At Area 118, 0.76% Cu, 0.42 g/t Au, and 3.56 g/t Ag (1.15 % CuEq) over 29.7 m, from 212 m
depth in drill hole 25SCM057.
March 25, 2026 - Vancouver, BC and Pelly Crossing, YT – Selkirk Copper Mines Inc . (TSX-V:SCMI |
FRA:IO20 | OTCQB:SKRKF) (“Selkirk Copper ” or the “ Company”) is pleased to announce new assay
results from the on going 50,000 m drill program at the Minto Mine in Yukon, Canada.
M. Colin Joudrie, President & CEO, commented: “As we near completion of the planned 50,000 m Phase 1 drill
program, and we continue to advance engineering trade off studies, the restart plan is getting better defined. The
current phase of drilling is continuing to define and expand zones of high-grade mineralization at Minto North
and step-out drilling at Minto East has confirmed the presence of multiple stacked lenses and demonstrates
continuity beyond previously drilled areas which is further defining underground development plans .
Additionally, results from Ridgetop and Area 118 are extending mineralization within and beyond the current
open pit configurations, supporting the potential for expansion of near -surface resources and further defining
open pit development plans. These results are being incorporated into ongoing resource modelling and study
work as we advance the Preliminary Economic Assessment (PEA) for the Minto copper-gold-silver mine which
is on schedule to be completed by mid-2026.”
“I would also like thank Chuck Hennessey for joining the team as Senior Vice President Operations in
November 2025. Over the past five months, Chuck has significantly refin ed our development plans through
hands-on assessment of the mill and mining infrastructure at Minto , working with the exploration and
engineering teams to bring focus to safety, environment, and pragmatic planning work, and assisting the
management team in advancing the restart plan. We wish Chuck all the best in his future endeavours.”
2026 Phase 1 Drill Program Update
Four diamond drill rigs are active at the Minto mine as the Phase 1 drill program, which started in August 2025
and is nearing completion. The 50,000 m Phase 1 program is focused on resource expansion , as well as
technical data collection to support the upcoming Preliminary Economic Assessment. As of March 20, 48,751
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metres of drilling in 164 drill holes have been completed, or 97 % of the planned 50,000 metre program. The
Phase 1 drill program is expected to be completed before the end of March.
Reported here are assay results from holes drilled in late October to mid -November 2025. Results from
approximately 48% of the Phase 1 50,000 m program have now been released. The company expects to
continue releasing assay results from the Phase 1 drill program as they are received throughout the first half of
2026.
Table 1: Drilling by Zone
Zone Holes
completed Metres drilled % Samples
Received
Minto North 39 12,206 23.84%
Ridgetop 68 13,940 45.14%
Minto East 21 10,708 14.74%
Copper Keel 10 3,475 8.22%
118 15 4984 8.06%
Minto Main 11 4,973 0.0%
Total 164 48,751
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Figure 1: Plan view of the Minto Mine showing surface projections of mineralization zones (Ridgetop (yellow), Copper Keel (green),
118 (blue), Minto East (purple) and Minto North (red)), relative to Phase 1 drill collars (yellow circles). Drill hole results released
highlighted in orange circles.
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Drill Results
Minto North
Drilling at the Minto North zone continues to delineate the extents of high-grade mineralization in this area,
which remains open for expansion in the north and south directions . Reported here are five additional holes
from Minto North, all of which returned significant mineralization.
Drilling in this area continues to focus on the Minto N orth west lens, which is characterized as a zone of
intensely foliated and migmatized granodiorite containing disseminated to semi -massive bornite and
chalcopyrite mineralization (Figure 2). Magnetite also occurs with the sulphide mineralization, and results in
an elevated magnetic susceptibility compared to the surrounding unmineralized rock. The Minto North west
lens has been delineated over an area of approximately 315 x 350 m, with a thickness ranging from 5 to 55
metres thick (Figure 3). Preliminary geological modelling indicates that the lens is gently north-dipping, with
high-grade mineralization and increased thickness focused along a northwest trend within the lens.
Recent drilling results such as drill hole 25SCM080 demonstrate exceptionally high copper, gold, and silver
grades that occur within this lens, including 4.28% Cu, 4.89 g/t Au, and 19.4 g/t Ag ( 8.1% CuEq) over 1.6
metres within a broader zone of 1.33% Cu, 0.97 g/t Au and 5.48 g/t Ag (2.1% CuEq) over 29.7 m (Figure 2 &
3).
Recent geological logging in this area has also identified a series of northwest -striking faults that divide or
offset mineralization within broader the Minto North area. Interpretation is ongoing to identify potential new
drill targets using geological, structural, and geophysical datasets.
Figure 2: Drill core photographs of high-grade bornite and chalcopyrite mineralization in three drill holes intersecting
the Minto north west Lens.
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Figure 3: Minto North Plan View Map highlight results from 25SCM080.
Minto East
Drilling at Minto East is focused on expanding several stacked mineralized lenses. Reported here are five
holes, all of which returned significant mineralization.
Within Minto East, at least five sub-horizontal mineralized domains have been intersected within an area that
is approximately 950 x 250 metres wide. Historical drilling has delineated these lenses at depths of 7 0 to 450
metres below surface. The current drill program has undertaken large step-outs that have expanded the zone
of mineralization at Minto East beyond what was previously described . Additionally, recent drilling has
intersected mineralization at depths of up to 650 metres below surface, well beyond previous drill depths ,
indicating potential for delineating additional resources at depth.
Individual lenses within Minto East are broadly similar to each other, consisting of bornite and chalcopyrite
mineralization hosted in foliated to migmatized granodiorite. Individual lenses are 5 to 30 metres thick, and
continuous along strike for up to 500 meters. Continuity of grade and thickness along lenses is relatively high,
and mineralization is open for expansion to the north and to the south.
Drill hole 25SCM082 (Figure 4) , reported here, intersected three intervals of significant mineralization at
depths of 378, 421, and 484 metres below surface. The deepest interval 484 metres below surface represented
a 90 m step-out from the nearest previous drilling, and returned strong grades of 2.45% Cu, 1.18 g/t Au, and
8.44 g/t Ag (3.4% CuEq) over 5.8 m . This mineralization remains open to the east, west, and north , and is a
priority target for follow-up drilling.
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Figure 4: Plan view and cross section of Minto East, showing Phase 1 drilling targeting northern and deep extensions of
lenses.
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Ridgetop and Area 118
Drilling in the southern half of the property is focused on defining the potential open-pit resources at Ridgetop
and Area 118 zones. These potential open-pit resources represent an opportunity to delineate relatively large
amounts of near-surface tonnage that could be mined at low strip ratio and a t a lower cut-off grade. Reported
here are 16 holes from Ridgetop (Figure 5) and 5 holes from Area 118 (Figure 6) that were drilled in October
and November. Of these 21 drill holes, 19 returned significant intercepts.
At Ridgetop South, the drilling reported here represents a balance of infill holes and a fence of holes stepping-
out 50 to 75 metres south and southwest beyond the limits of previous drilling. Mineralization in the southern
part of Ridgetop is comprised of a series of three stacked, subhorizontal lenses that occur within 125 metres of
surface. Assay results from drilling at Ridgetop reported here vary from 0.5% CuEq to 1.2% CuEq,
significantly above the 2025 MRE open pit cut-off grade of 0.30% CuEq.
At Area 118, the drilling reported here represents a fence of holes stepping -out 40 to 100 metres southeast,
testing the continuity of a series of high-grade intercepts from historical drilling that sit outside the 2025 MRE
modelled mineralization. Mineralization in this area comprises at least two stacked lenses that occur within
150 metres of surface. Assay results reported from Area 118 reported here vary from 0.45% CuEq to 0.65%
CuEq, above the 2025 MRE open pit cut-off grade of 0.30% CuEq.
Also, within Area 118, drill hole 25SCM057 intersected additional, unexpected, mineralization at depth
beneath the known lenses. This intersection, comprising 0.76% Cu, 0.42 g/t Au, and 3.56 g/t Ag (1.15 % CuEq)
over 29.7 metres, represents a new mineralized lens that was not previously recognized (Figure 6). Building
on this discovery, additional drilling has been incorporated into the Phase 1 drilling program to target
expansion of this newly recognized mineralized lens at depth within Area 118.
Figure 5: Plan view and Cross section view of the Ridgetop drilling
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Figure 6: Plan Map of the 118 south zone including expansion drilling from Phase 1
The location, azimuth, dip and depth of hole of this new drilling is summarized in Table 2 and significant
intervals are summarized in Table 3.
Table 2: Collar Locations and Header Information
Hole ID Easting Northing Azi Dip EOH (m) Zones
25SCM041 384917 6943579 0 -90 104 Ridgetop
25SCM047 385006 6943515 0 -90 165.16 Ridgetop
25SCM049 385809 6943730 0 -90 258 Copper Keel
25SCM050 385810 6943730 90 -65 207 Copper Keel
25SCM051 384991 6943488 0 -90 165 Ridgetop
25SCM053 384995 6943425 0 -90 168 RT South
25SCM054 385359 6945040 0 -90 420 Minto East
25SCM055 385029 6943455 0 -90 165 Ridgetop
25SCM056 384506 6943786 245 -70 125 Area 118
25SCM057 384507 6943789 65 -70 354 Area 118
25SCM058 384973 6943458 0 -90 180 Ridgetop
25SCM059 383888 6945945 305 -63.5 291 Minto North
25SCM060 384938 6943509 0 -90 189 Ridgetop